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Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/JPEGDecoder.java')
| -rw-r--r-- | bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/JPEGDecoder.java | 6355 |
1 files changed, 0 insertions, 6355 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/JPEGDecoder.java b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/JPEGDecoder.java deleted file mode 100644 index 54d6daa793..0000000000 --- a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/JPEGDecoder.java +++ /dev/null @@ -1,6355 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2000, 2009 IBM Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Eclipse Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/epl-v10.html - * - * Contributors: - * IBM Corporation - initial API and implementation - *******************************************************************************/ -package org.eclipse.swt.internal.image; - -import java.io.*; - -import org.eclipse.swt.*; -import org.eclipse.swt.graphics.*; - -public class JPEGDecoder { - - static final int DCTSIZE = 8; - static final int DCTSIZE2 = 64; - static final int NUM_QUANT_TBLS = 4; - static final int NUM_HUFF_TBLS = 4; - static final int NUM_ARITH_TBLS = 16; - static final int MAX_COMPS_IN_SCAN = 4; - static final int MAX_COMPONENTS = 10; - static final int MAX_SAMP_FACTOR = 4; - static final int D_MAX_BLOCKS_IN_MCU = 10; - static final int HUFF_LOOKAHEAD = 8; - static final int MAX_Q_COMPS = 4; - static final int IFAST_SCALE_BITS = 2; - static final int MAXJSAMPLE = 255; - static final int CENTERJSAMPLE = 128; - static final int MIN_GET_BITS = 32-7; - static final int INPUT_BUFFER_SIZE = 4096; - - static final int SCALEBITS = 16; /* speediest right-shift on some machines */ - static final int ONE_HALF = 1 << (SCALEBITS-1); - - static final int RGB_RED = 2; /* Offset of Red in an RGB scanline element */ - static final int RGB_GREEN = 1; /* Offset of Green */ - static final int RGB_BLUE = 0; /* Offset of Blue */ - static final int RGB_PIXELSIZE = 3; - - static final int JBUF_PASS_THRU = 0; - static final int JBUF_SAVE_SOURCE = 1; /* Run source subobject only, save output */ - static final int JBUF_CRANK_DEST = 2; /* Run dest subobject only, using saved data */ - static final int JBUF_SAVE_AND_PASS = 3; - - static final int JPEG_MAX_DIMENSION = 65500; - static final int BITS_IN_JSAMPLE = 8; - - static final int JDITHER_NONE = 0; /* no dithering */ - static final int JDITHER_ORDERED = 1; /* simple ordered dither */ - static final int JDITHER_FS = 2; - - static final int JDCT_ISLOW = 0; /* slow but accurate integer algorithm */ - static final int JDCT_IFAST = 1; /* faster, less accurate integer method */ - static final int JDCT_FLOAT = 2; /* floating-point: accurate, fast on fast HW */ - static final int JDCT_DEFAULT = JDCT_ISLOW; - - static final int JCS_UNKNOWN = 0; /* error/unspecified */ - static final int JCS_GRAYSCALE = 1; /* monochrome */ - static final int JCS_RGB = 2; /* red/green/blue */ - static final int JCS_YCbCr = 3; /* Y/Cb/Cr (also known as YUV) */ - static final int JCS_CMYK = 4; /* C/M/Y/K */ - static final int JCS_YCCK = 5; /* Y/Cb/Cr/K */ - - static final int SAVED_COEFS = 6; - static final int Q01_POS = 1; - static final int Q10_POS = 8; - static final int Q20_POS = 16; - static final int Q11_POS = 9; - static final int Q02_POS = 2; - - static final int CTX_PREPARE_FOR_IMCU = 0; /* need to prepare for MCU row */ - static final int CTX_PROCESS_IMCU = 1; /* feeding iMCU to postprocessor */ - static final int CTX_POSTPONED_ROW = 2; /* feeding postponed row group */ - - static final int APP0_DATA_LEN = 14; /* Length of interesting data in APP0 */ - static final int APP14_DATA_LEN = 12; /* Length of interesting data in APP14 */ - static final int APPN_DATA_LEN = 14; /* Must be the largest of the above!! */ - - /* markers */ - static final int M_SOF0 = 0xc0; - static final int M_SOF1 = 0xc1; - static final int M_SOF2 = 0xc2; - static final int M_SOF3 = 0xc3; - static final int M_SOF5 = 0xc5; - static final int M_SOF6 = 0xc6; - static final int M_SOF7 = 0xc7; - static final int M_JPG = 0xc8; - static final int M_SOF9 = 0xc9; - static final int M_SOF10 = 0xca; - static final int M_SOF11 = 0xcb; - static final int M_SOF13 = 0xcd; - static final int M_SOF14 = 0xce; - static final int M_SOF15 = 0xcf; - static final int M_DHT = 0xc4; - static final int M_DAC = 0xcc; - static final int M_RST0 = 0xd0; - static final int M_RST1 = 0xd1; - static final int M_RST2 = 0xd2; - static final int M_RST3 = 0xd3; - static final int M_RST4 = 0xd4; - static final int M_RST5 = 0xd5; - static final int M_RST6 = 0xd6; - static final int M_RST7 = 0xd7; - static final int M_SOI = 0xd8; - static final int M_EOI = 0xd9; - static final int M_SOS = 0xda; - static final int M_DQT = 0xdb; - static final int M_DNL = 0xdc; - static final int M_DRI = 0xdd; - static final int M_DHP = 0xde; - static final int M_EXP = 0xdf; - static final int M_APP0 = 0xe0; - static final int M_APP1 = 0xe1; - static final int M_APP2 = 0xe2; - static final int M_APP3 = 0xe3; - static final int M_APP4 = 0xe4; - static final int M_APP5 = 0xe5; - static final int M_APP6 = 0xe6; - static final int M_APP7 = 0xe7; - static final int M_APP8 = 0xe8; - static final int M_APP9 = 0xe9; - static final int M_APP10 = 0xea; - static final int M_APP11 = 0xeb; - static final int M_APP12 = 0xec; - static final int M_APP13 = 0xed; - static final int M_APP14 = 0xee; - static final int M_APP15 = 0xef; - static final int M_JPG0 = 0xf0; - static final int M_JPG13 = 0xfd; - static final int M_COM = 0xfe; - static final int M_TEM = 0x01; - static final int M_ERROR = 0x100; - - /* Values of global_state field (jdapi.c has some dependencies on ordering!) */ - static final int CSTATE_START = 100; /* after create_compress */ - static final int CSTATE_SCANNING = 101; /* start_compress done, write_scanlines OK */ - static final int CSTATE_RAW_OK = 102; /* start_compress done, write_raw_data OK */ - static final int CSTATE_WRCOEFS = 103; /* jpeg_write_coefficients done */ - static final int DSTATE_START = 200; /* after create_decompress */ - static final int DSTATE_INHEADER = 201; /* reading header markers, no SOS yet */ - static final int DSTATE_READY = 202; /* found SOS, ready for start_decompress */ - static final int DSTATE_PRELOAD = 203; /* reading multiscan file in start_decompress*/ - static final int DSTATE_PRESCAN = 204; /* performing dummy pass for 2-pass quant */ - static final int DSTATE_SCANNING = 205; /* start_decompress done, read_scanlines OK */ - static final int DSTATE_RAW_OK = 206; /* start_decompress done, read_raw_data OK */ - static final int DSTATE_BUFIMAGE = 207; /* expecting jpeg_start_output */ - static final int DSTATE_BUFPOST = 208; /* looking for SOS/EOI in jpeg_finish_output */ - static final int DSTATE_RDCOEFS = 209; /* reading file in jpeg_read_coefficients */ - static final int DSTATE_STOPPING = 210; /* looking for EOI in jpeg_finish_decompress */ - - static final int JPEG_REACHED_SOS = 1; /* Reached start of new scan */ - static final int JPEG_REACHED_EOI = 2; /* Reached end of image */ - static final int JPEG_ROW_COMPLETED = 3; /* Completed one iMCU row */ - static final int JPEG_SCAN_COMPLETED = 4; /* Completed last iMCU row of a scan */ - - static final int JPEG_SUSPENDED = 0; /* Suspended due to lack of input data */ - static final int JPEG_HEADER_OK = 1; /* Found valid image datastream */ - static final int JPEG_HEADER_TABLES_ONLY = 2; /* Found valid table-specs-only datastream */ - - /* Function pointers */ - static final int DECOMPRESS_DATA = 0; - static final int DECOMPRESS_SMOOTH_DATA = 1; - static final int DECOMPRESS_ONEPASS = 2; - - static final int CONSUME_DATA = 0; - static final int DUMMY_CONSUME_DATA = 1; - - static final int PROCESS_DATA_SIMPLE_MAIN = 0; - static final int PROCESS_DATA_CONTEXT_MAIN = 1; - static final int PROCESS_DATA_CRANK_POST = 2; - - static final int POST_PROCESS_1PASS = 0; - static final int POST_PROCESS_DATA_UPSAMPLE = 1; - - static final int NULL_CONVERT = 0; - static final int GRAYSCALE_CONVERT = 1; - static final int YCC_RGB_CONVERT = 2; - static final int GRAY_RGB_CONVERT = 3; - static final int YCCK_CMYK_CONVERT = 4; - - static final int NOOP_UPSAMPLE = 0; - static final int FULLSIZE_UPSAMPLE = 1; - static final int H2V1_FANCY_UPSAMPLE = 2; - static final int H2V1_UPSAMPLE = 3; - static final int H2V2_FANCY_UPSAMPLE = 4; - static final int H2V2_UPSAMPLE = 5; - static final int INT_UPSAMPLE = 6; - - static final int INPUT_CONSUME_INPUT = 0; - static final int COEF_CONSUME_INPUT = 1; - - static int extend_test[] = /* entry n is 2**(n-1) */ - { - 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080, - 0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 - }; - - static int extend_offset[] = /* entry n is (-1 << n) + 1 */ - { - 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1, - ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1, - ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1, - ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 - }; - - static int jpeg_natural_order[] = { - 0, 1, 8, 16, 9, 2, 3, 10, - 17, 24, 32, 25, 18, 11, 4, 5, - 12, 19, 26, 33, 40, 48, 41, 34, - 27, 20, 13, 6, 7, 14, 21, 28, - 35, 42, 49, 56, 57, 50, 43, 36, - 29, 22, 15, 23, 30, 37, 44, 51, - 58, 59, 52, 45, 38, 31, 39, 46, - 53, 60, 61, 54, 47, 55, 62, 63, - 63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */ - 63, 63, 63, 63, 63, 63, 63, 63 - }; - - static final class JQUANT_TBL { - /* This array gives the coefficient quantizers in natural array order - * (not the zigzag order in which they are stored in a JPEG DQT marker). - * CAUTION: IJG versions prior to v6a kept this array in zigzag order. - */ - short[] quantval = new short[DCTSIZE2]; /* quantization step for each coefficient */ - /* This field is used only during compression. It's initialized false when - * the table is created, and set true when it's been output to the file. - * You could suppress output of a table by setting this to true. - * (See jpeg_suppress_tables for an example.) - */ - boolean sent_table; /* true when table has been output */ - } - - static final class JHUFF_TBL { - /* These two fields directly represent the contents of a JPEG DHT marker */ - byte[] bits = new byte[17]; /* bits[k] = # of symbols with codes of */ - /* length k bits; bits[0] is unused */ - byte[] huffval = new byte[256]; /* The symbols, in order of incr code length */ - /* This field is used only during compression. It's initialized false when - * the table is created, and set true when it's been output to the file. - * You could suppress output of a table by setting this to true. - * (See jpeg_suppress_tables for an example.) - */ - boolean sent_table; /* true when table has been output */ - } - - static final class bitread_perm_state { /* Bitreading state saved across MCUs */ - int get_buffer; /* current bit-extraction buffer */ - int bits_left; /* # of unused bits in it */ - } - - static final class bitread_working_state { /* Bitreading working state within an MCU */ - /* Current data source location */ - /* We need a copy, rather than munging the original, in case of suspension */ - byte[] buffer; /* => next byte to read from source */ - int bytes_offset; - int bytes_in_buffer; /* # of bytes remaining in source buffer */ - /* Bit input buffer --- note these values are kept in register variables, - * not in this struct, inside the inner loops. - */ - int get_buffer; /* current bit-extraction buffer */ - int bits_left; /* # of unused bits in it */ - /* Pointer needed by jpeg_fill_bit_buffer. */ - jpeg_decompress_struct cinfo; /* back link to decompress master record */ - } - - static final class savable_state { - int EOBRUN; //Note that this is only used in the progressive case - int[] last_dc_val = new int[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */ - } - - static final class d_derived_tbl { - /* Basic tables: (element [0] of each array is unused) */ - int[] maxcode = new int[18]; /* largest code of length k (-1 if none) */ - /* (maxcode[17] is a sentinel to ensure jpeg_huff_decode terminates) */ - int[] valoffset = new int[17]; /* huffval[] offset for codes of length k */ - /* valoffset[k] = huffval[] index of 1st symbol of code length k, less - * the smallest code of length k; so given a code of length k, the - * corresponding symbol is huffval[code + valoffset[k]] - */ - - /* Link to public Huffman table (needed only in jpeg_huff_decode) */ - JHUFF_TBL pub; - - /* Lookahead tables: indexed by the next HUFF_LOOKAHEAD bits of - * the input data stream. If the next Huffman code is no more - * than HUFF_LOOKAHEAD bits long, we can obtain its length and - * the corresponding symbol directly from these tables. - */ - int[] look_nbits = new int[1<<HUFF_LOOKAHEAD]; /* # bits, or 0 if too long */ - byte[] look_sym = new byte[1<<HUFF_LOOKAHEAD]; /* symbol, or unused */ - } - - static final class jpeg_d_coef_controller { - int consume_data; - int decompress_data; - - /* Pointer to array of coefficient virtual arrays, or null if none */ - short[][][] coef_arrays; - - /* These variables keep track of the current location of the input side. */ - /* cinfo.input_iMCU_row is also used for this. */ - int MCU_ctr; /* counts MCUs processed in current row */ - int MCU_vert_offset; /* counts MCU rows within iMCU row */ - int MCU_rows_per_iMCU_row; /* number of such rows needed */ - - /* The output side's location is represented by cinfo.output_iMCU_row. */ - - /* In single-pass modes, it's sufficient to buffer just one MCU. - * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, - * and let the entropy decoder write into that workspace each time. - * (On 80x86, the workspace is FAR even though it's not really very big; - * this is to keep the module interfaces unchanged when a large coefficient - * buffer is necessary.) - * In multi-pass modes, this array points to the current MCU's blocks - * within the virtual arrays; it is used only by the input side. - */ - short[][] MCU_buffer = new short[D_MAX_BLOCKS_IN_MCU][]; - - /* In multi-pass modes, we need a virtual block array for each component. */ - short[][][][] whole_image = new short[MAX_COMPONENTS][][][]; - - /* When doing block smoothing, we latch coefficient Al values here */ - int[] coef_bits_latch; - - short[] workspace; - - void start_input_pass (jpeg_decompress_struct cinfo) { - cinfo.input_iMCU_row = 0; - start_iMCU_row(cinfo); - } - - /* Reset within-iMCU-row counters for a new row (input side) */ - void start_iMCU_row (jpeg_decompress_struct cinfo) { - jpeg_d_coef_controller coef = cinfo.coef; - - /* In an interleaved scan, an MCU row is the same as an iMCU row. - * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. - * But at the bottom of the image, process only what's left. - */ - if (cinfo.comps_in_scan > 1) { - coef.MCU_rows_per_iMCU_row = 1; - } else { - if (cinfo.input_iMCU_row < (cinfo.total_iMCU_rows-1)) - coef.MCU_rows_per_iMCU_row = cinfo.cur_comp_info[0].v_samp_factor; - else - coef.MCU_rows_per_iMCU_row = cinfo.cur_comp_info[0].last_row_height; - } - - coef.MCU_ctr = 0; - coef.MCU_vert_offset = 0; - } - - } - - static abstract class jpeg_entropy_decoder { - abstract void start_pass (jpeg_decompress_struct cinfo); - abstract boolean decode_mcu (jpeg_decompress_struct cinfo, short[][] MCU_data); - - /* This is here to share code between baseline and progressive decoders; */ - /* other modules probably should not use it */ - boolean insufficient_data; /* set true after emitting warning */ - - bitread_working_state br_state_local = new bitread_working_state(); - savable_state state_local = new savable_state(); - } - - static final class huff_entropy_decoder extends jpeg_entropy_decoder { - bitread_perm_state bitstate = new bitread_perm_state(); /* Bit buffer at start of MCU */ - savable_state saved = new savable_state(); /* Other state at start of MCU */ - - /* These fields are NOT loaded into local working state. */ - int restarts_to_go; /* MCUs left in this restart interval */ - - /* Pointers to derived tables (these workspaces have image lifespan) */ - d_derived_tbl[] dc_derived_tbls = new d_derived_tbl[NUM_HUFF_TBLS]; - d_derived_tbl[] ac_derived_tbls = new d_derived_tbl[NUM_HUFF_TBLS]; - - /* Precalculated info set up by start_pass for use in decode_mcu: */ - - /* Pointers to derived tables to be used for each block within an MCU */ - d_derived_tbl[] dc_cur_tbls = new d_derived_tbl[D_MAX_BLOCKS_IN_MCU]; - d_derived_tbl[] ac_cur_tbls = new d_derived_tbl[D_MAX_BLOCKS_IN_MCU]; - /* Whether we care about the DC and AC coefficient values for each block */ - boolean[] dc_needed = new boolean[D_MAX_BLOCKS_IN_MCU]; - boolean[] ac_needed = new boolean[D_MAX_BLOCKS_IN_MCU]; - - void start_pass (jpeg_decompress_struct cinfo) { - start_pass_huff_decoder(cinfo); - } - - boolean decode_mcu (jpeg_decompress_struct cinfo, short[][] MCU_data) { - huff_entropy_decoder entropy = this; - int blkn; -// BITREAD_STATE_VARS; - int get_buffer; - int bits_left; -// bitread_working_state br_state = new bitread_working_state(); -// savable_state state = new savable_state(); - bitread_working_state br_state = br_state_local; - savable_state state = state_local; - - /* Process restart marker if needed; may have to suspend */ - if (cinfo.restart_interval != 0) { - if (entropy.restarts_to_go == 0) - if (! process_restart(cinfo)) - return false; - } - - /* If we've run out of data, just leave the MCU set to zeroes. - * This way, we return uniform gray for the remainder of the segment. - */ - if (! entropy.insufficient_data) { - - /* Load up working state */ -// BITREAD_LOAD_STATE(cinfo,entropy.bitstate); - br_state.cinfo = cinfo; - br_state.buffer = cinfo.buffer; - br_state.bytes_in_buffer = cinfo.bytes_in_buffer; - br_state.bytes_offset = cinfo.bytes_offset; - get_buffer = entropy.bitstate.get_buffer; - bits_left = entropy.bitstate.bits_left; - -// ASSIGN_STATE(state, entropy.saved); - state.last_dc_val[0] = entropy.saved.last_dc_val[0]; - state.last_dc_val[1] = entropy.saved.last_dc_val[1]; - state.last_dc_val[2] = entropy.saved.last_dc_val[2]; - state.last_dc_val[3] = entropy.saved.last_dc_val[3]; - - /* Outer loop handles each block in the MCU */ - - for (blkn = 0; blkn < cinfo.blocks_in_MCU; blkn++) { - short[] block = MCU_data[blkn]; - d_derived_tbl dctbl = entropy.dc_cur_tbls[blkn]; - d_derived_tbl actbl = entropy.ac_cur_tbls[blkn]; - int s = 0, k, r; - - /* Decode a single block's worth of coefficients */ - - /* Section F.2.2.1: decode the DC coefficient difference */ -// HUFF_DECODE(s, br_state, dctbl, return FALSE, label1); - { - int nb = 0, look; - if (bits_left < HUFF_LOOKAHEAD) { - if (!jpeg_fill_bit_buffer(br_state,get_buffer,bits_left, 0)) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - if (bits_left < HUFF_LOOKAHEAD) { - nb = 1; -// goto slowlabel; - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,dctbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } -// look = PEEK_BITS(HUFF_LOOKAHEAD); - if (nb != 1) { - look = (( (get_buffer >> (bits_left - (HUFF_LOOKAHEAD)))) & ((1<<(HUFF_LOOKAHEAD))-1)); - if ((nb = dctbl.look_nbits[look]) != 0) { -// DROP_BITS(nb); - bits_left -= nb; - s = dctbl.look_sym[look] & 0xFF; - } else { - nb = HUFF_LOOKAHEAD+1; -// slowlabel: - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,dctbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - } - - if (s != 0) { -// CHECK_BIT_BUFFER(br_state, s, return FALSE); - { - if (bits_left < (s)) { - if (!jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,s)) { - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// r = GET_BITS(s); - r = (( (get_buffer >> (bits_left -= (s)))) & ((1<<(s))-1)); -// s = HUFF_EXTEND(r, s); - s = ((r) < extend_test[s] ? (r) + extend_offset[s] : (r)); - } - - if (entropy.dc_needed[blkn]) { - /* Convert DC difference to actual value, update last_dc_val */ - int ci = cinfo.MCU_membership[blkn]; - s += state.last_dc_val[ci]; - state.last_dc_val[ci] = s; - /* Output the DC coefficient (assumes jpeg_natural_order[0] = 0) */ - block[0] = (short) s; - } - - if (entropy.ac_needed[blkn]) { - - /* Section F.2.2.2: decode the AC coefficients */ - /* Since zeroes are skipped, output area must be cleared beforehand */ - for (k = 1; k < DCTSIZE2; k++) { -// HUFF_DECODE(s, br_state, actbl, return FALSE, label2); - { - int nb = 0, look; - if (bits_left < HUFF_LOOKAHEAD) { - if (!jpeg_fill_bit_buffer(br_state,get_buffer,bits_left, 0)) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - if (bits_left < HUFF_LOOKAHEAD) { - nb = 1; -// goto slowlabel; - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,actbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - if (nb != 1) { -// look = PEEK_BITS(HUFF_LOOKAHEAD); - look = (( (get_buffer >> (bits_left - (HUFF_LOOKAHEAD)))) & ((1<<(HUFF_LOOKAHEAD))-1)); - if ((nb = actbl.look_nbits[look]) != 0) { -// DROP_BITS(nb); - bits_left -= (nb); - s = actbl.look_sym[look] & 0xFF; - } else { - nb = HUFF_LOOKAHEAD+1; -// slowlabel: - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,actbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - } - r = s >> 4; - s &= 15; - - if (s != 0) { - k += r; -// CHECK_BIT_BUFFER(br_state, s, return FALSE); - { - if (bits_left < (s)) { - if (!jpeg_fill_bit_buffer(br_state, get_buffer, bits_left, s)) { - return false; - } - get_buffer = (br_state).get_buffer; - bits_left = (br_state).bits_left; - } - } -// r = GET_BITS(s); - r = (((get_buffer >> (bits_left -= (s)))) & ((1 << (s)) - 1)); -// s = HUFF_EXTEND(r, s); - s = ((r) < extend_test[s] ? (r) + extend_offset[s] : (r)); - /* - * Output coefficient in natural (dezigzagged) - * order. Note: the extra entries in - * jpeg_natural_order[] will save us if k >= - * DCTSIZE2, which could happen if the data is - * corrupted. - */ - block[jpeg_natural_order[k]] = (short) s; - } else { - if (r != 15) - break; - k += 15; - } - } - - } else { - - /* Section F.2.2.2: decode the AC coefficients */ - /* In this path we just discard the values */ - for (k = 1; k < DCTSIZE2; k++) { -// HUFF_DECODE(s, br_state, actbl, return FALSE, label3); - { - int nb = 0, look; - if (bits_left < HUFF_LOOKAHEAD) { - if (!jpeg_fill_bit_buffer(br_state,get_buffer,bits_left, 0)) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - if (bits_left < HUFF_LOOKAHEAD) { - nb = 1; -// goto slowlabel; - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,actbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - if (nb != 1) { -// look = PEEK_BITS(HUFF_LOOKAHEAD); - look = (( (get_buffer >> (bits_left - (HUFF_LOOKAHEAD)))) & ((1<<(HUFF_LOOKAHEAD))-1)); - if ((nb = actbl.look_nbits[look]) != 0) { -// DROP_BITS(nb); - bits_left -= (nb); - s = actbl.look_sym[look] & 0xFF; - } else { - nb = HUFF_LOOKAHEAD+1; -// slowlabel: - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,actbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - } - r = s >> 4; - s &= 15; - - if (s != 0) { - k += r; -// CHECK_BIT_BUFFER(br_state, s, return FALSE); - { - if (bits_left < (s)) { - if (!jpeg_fill_bit_buffer((br_state),get_buffer,bits_left,s)) { - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// DROP_BITS(s); - bits_left -= s; - } else { - if (r != 15) - break; - k += 15; - } - } - - } - } - - /* Completed MCU, so update state */ -// BITREAD_SAVE_STATE(cinfo,entropy.bitstate); - cinfo.buffer = br_state.buffer; - cinfo.bytes_in_buffer = br_state.bytes_in_buffer; - cinfo.bytes_offset = br_state.bytes_offset; - entropy.bitstate.get_buffer = get_buffer; - entropy.bitstate.bits_left = bits_left; -// ASSIGN_STATE(entropy.saved, state); - entropy.saved.last_dc_val[0] = state.last_dc_val[0]; - entropy.saved.last_dc_val[1] = state.last_dc_val[1]; - entropy.saved.last_dc_val[2] = state.last_dc_val[2]; - entropy.saved.last_dc_val[3] = state.last_dc_val[3]; - } - - /* Account for restart interval (no-op if not using restarts) */ - entropy.restarts_to_go--; - - return true; - } - - void start_pass_huff_decoder (jpeg_decompress_struct cinfo) { - huff_entropy_decoder entropy = this; - int ci, blkn, dctbl, actbl; - jpeg_component_info compptr; - - /* Check that the scan parameters Ss, Se, Ah/Al are OK for sequential JPEG. - * This ought to be an error condition, but we make it a warning because - * there are some baseline files out there with all zeroes in these bytes. - */ - if (cinfo.Ss != 0 || cinfo.Se != DCTSIZE2-1 || cinfo.Ah != 0 || cinfo.Al != 0) { -// WARNMS(cinfo, JWRN_NOT_SEQUENTIAL); - } - - for (ci = 0; ci < cinfo.comps_in_scan; ci++) { - compptr = cinfo.cur_comp_info[ci]; - dctbl = compptr.dc_tbl_no; - actbl = compptr.ac_tbl_no; - /* Compute derived values for Huffman tables */ - /* We may do this more than once for a table, but it's not expensive */ - jpeg_make_d_derived_tbl(cinfo, true, dctbl, entropy.dc_derived_tbls[dctbl] = new d_derived_tbl()); - jpeg_make_d_derived_tbl(cinfo, false, actbl, entropy.ac_derived_tbls[actbl] = new d_derived_tbl()); - /* Initialize DC predictions to 0 */ - entropy.saved.last_dc_val[ci] = 0; - } - - /* Precalculate decoding info for each block in an MCU of this scan */ - for (blkn = 0; blkn < cinfo.blocks_in_MCU; blkn++) { - ci = cinfo.MCU_membership[blkn]; - compptr = cinfo.cur_comp_info[ci]; - /* Precalculate which table to use for each block */ - entropy.dc_cur_tbls[blkn] = entropy.dc_derived_tbls[compptr.dc_tbl_no]; - entropy.ac_cur_tbls[blkn] = entropy.ac_derived_tbls[compptr.ac_tbl_no]; - /* Decide whether we really care about the coefficient values */ - if (compptr.component_needed) { - entropy.dc_needed[blkn] = true; - /* we don't need the ACs if producing a 1/8th-size image */ - entropy.ac_needed[blkn] = (compptr.DCT_scaled_size > 1); - } else { - entropy.dc_needed[blkn] = entropy.ac_needed[blkn] = false; - } - } - - /* Initialize bitread state variables */ - entropy.bitstate.bits_left = 0; - entropy.bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */ - entropy.insufficient_data = false; - - /* Initialize restart counter */ - entropy.restarts_to_go = cinfo.restart_interval; - } - - boolean process_restart (jpeg_decompress_struct cinfo) { - huff_entropy_decoder entropy = this; - int ci; - - /* Throw away any unused bits remaining in bit buffer; */ - /* include any full bytes in next_marker's count of discarded bytes */ - cinfo.marker.discarded_bytes += entropy.bitstate.bits_left / 8; - entropy.bitstate.bits_left = 0; - - /* Advance past the RSTn marker */ - if (! read_restart_marker (cinfo)) - return false; - - /* Re-initialize DC predictions to 0 */ - for (ci = 0; ci < cinfo.comps_in_scan; ci++) - entropy.saved.last_dc_val[ci] = 0; - - /* Reset restart counter */ - entropy.restarts_to_go = cinfo.restart_interval; - - /* Reset out-of-data flag, unless read_restart_marker left us smack up - * against a marker. In that case we will end up treating the next data - * segment as empty, and we can avoid producing bogus output pixels by - * leaving the flag set. - */ - if (cinfo.unread_marker == 0) - entropy.insufficient_data = false; - - return true; - } - } - - static final class phuff_entropy_decoder extends jpeg_entropy_decoder { - - /* These fields are loaded into local variables at start of each MCU. - * In case of suspension, we exit WITHOUT updating them. - */ - bitread_perm_state bitstate = new bitread_perm_state(); /* Bit buffer at start of MCU */ - savable_state saved = new savable_state(); /* Other state at start of MCU */ - - /* These fields are NOT loaded into local working state. */ - int restarts_to_go; /* MCUs left in this restart interval */ - - /* Pointers to derived tables (these workspaces have image lifespan) */ - d_derived_tbl[] derived_tbls = new d_derived_tbl[NUM_HUFF_TBLS]; - - d_derived_tbl ac_derived_tbl; /* active table during an AC scan */ - - int[] newnz_pos = new int[DCTSIZE2]; - - void start_pass (jpeg_decompress_struct cinfo) { - start_pass_phuff_decoder(cinfo); - } - - boolean decode_mcu (jpeg_decompress_struct cinfo, short[][] MCU_data) { - boolean is_DC_band = (cinfo.Ss == 0); - if (cinfo.Ah == 0) { - if (is_DC_band) - return decode_mcu_DC_first(cinfo, MCU_data); - else - return decode_mcu_AC_first(cinfo, MCU_data); - } else { - if (is_DC_band) - return decode_mcu_DC_refine(cinfo, MCU_data); - else - return decode_mcu_AC_refine(cinfo, MCU_data); - } - } - - boolean decode_mcu_DC_refine (jpeg_decompress_struct cinfo, short[][] MCU_data) { - phuff_entropy_decoder entropy = this; - int p1 = 1 << cinfo.Al; /* 1 in the bit position being coded */ - int blkn; - short[] block; -// BITREAD_STATE_VARS; - int get_buffer; - int bits_left; -// bitread_working_state br_state = new bitread_working_state(); - bitread_working_state br_state = br_state_local; - - /* Process restart marker if needed; may have to suspend */ - if (cinfo.restart_interval != 0) { - if (entropy.restarts_to_go == 0) - if (! process_restart(cinfo)) - return false; - } - - /* Not worth the cycles to check insufficient_data here, - * since we will not change the data anyway if we read zeroes. - */ - - /* Load up working state */ -// BITREAD_LOAD_STATE(cinfo,entropy.bitstate); - br_state.cinfo = cinfo; - br_state.buffer = cinfo.buffer; - br_state.bytes_in_buffer = cinfo.bytes_in_buffer; - br_state.bytes_offset = cinfo.bytes_offset; - get_buffer = entropy.bitstate.get_buffer; - bits_left = entropy.bitstate.bits_left; - - /* Outer loop handles each block in the MCU */ - - for (blkn = 0; blkn < cinfo.blocks_in_MCU; blkn++) { - block = MCU_data[blkn]; - - /* Encoded data is simply the next bit of the two's-complement DC value */ -// CHECK_BIT_BUFFER(br_state, 1, return FALSE); - { - if (bits_left < (1)) { - if (!jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,1)) { - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// if (GET_BITS(1)) - if ((( (get_buffer >> (bits_left -= (1)))) & ((1<<(1))-1)) != 0) - block[0] |= p1; - /* Note: since we use |=, repeating the assignment later is safe */ - } - - /* Completed MCU, so update state */ -// BITREAD_SAVE_STATE(cinfo,entropy.bitstate); - cinfo.buffer = br_state.buffer; - cinfo.bytes_in_buffer = br_state.bytes_in_buffer; - cinfo.bytes_offset = br_state.bytes_offset; - entropy.bitstate.get_buffer = get_buffer; - entropy.bitstate.bits_left = bits_left; - - /* Account for restart interval (no-op if not using restarts) */ - entropy.restarts_to_go--; - - return true; - - } - - boolean decode_mcu_AC_refine (jpeg_decompress_struct cinfo, short[][] MCU_data) { - phuff_entropy_decoder entropy = this; - int Se = cinfo.Se; - int p1 = 1 << cinfo.Al; /* 1 in the bit position being coded */ - int m1 = (-1) << cinfo.Al; /* -1 in the bit position being coded */ - int s = 0, k, r; - int EOBRUN; - short[] block; - short[] thiscoef; -// BITREAD_STATE_VARS; - int get_buffer; - int bits_left; -// bitread_working_state br_state = new bitread_working_state(); - bitread_working_state br_state = br_state_local; - - d_derived_tbl tbl; - int num_newnz; - int[] newnz_pos = entropy.newnz_pos; - - /* Process restart marker if needed; may have to suspend */ - if (cinfo.restart_interval != 0) { - if (entropy.restarts_to_go == 0) - if (! process_restart(cinfo)) - return false; - } - - /* If we've run out of data, don't modify the MCU. - */ - if (! entropy.insufficient_data) { - - /* Load up working state */ -// BITREAD_LOAD_STATE(cinfo,entropy.bitstate); - br_state.cinfo = cinfo; - br_state.buffer = cinfo.buffer; - br_state.bytes_in_buffer = cinfo.bytes_in_buffer; - br_state.bytes_offset = cinfo.bytes_offset; - get_buffer = entropy.bitstate.get_buffer; - bits_left = entropy.bitstate.bits_left; - - EOBRUN = entropy.saved.EOBRUN; /* only part of saved state we need */ - - /* There is always only one block per MCU */ - block = MCU_data[0]; - tbl = entropy.ac_derived_tbl; - - /* If we are forced to suspend, we must undo the assignments to any newly - * nonzero coefficients in the block, because otherwise we'd get confused - * next time about which coefficients were already nonzero. - * But we need not undo addition of bits to already-nonzero coefficients; - * instead, we can test the current bit to see if we already did it. - */ - num_newnz = 0; - - /* initialize coefficient loop counter to start of band */ - k = cinfo.Ss; - - if (EOBRUN == 0) { - for (; k <= Se; k++) { -// HUFF_DECODE(s, br_state, tbl, goto undoit, label3); - { - int nb = 0, look; - if (bits_left < HUFF_LOOKAHEAD) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left, 0)) { -// failaction; - while (num_newnz > 0) - block[newnz_pos[--num_newnz]] = 0; - - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - if (bits_left < HUFF_LOOKAHEAD) { - nb = 1; -// goto slowlabel; - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,tbl,nb)) < 0) { -// failaction; - while (num_newnz > 0) - block[newnz_pos[--num_newnz]] = 0; - - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - if (nb != 1) { -// look = PEEK_BITS(HUFF_LOOKAHEAD); - look = (( (get_buffer >> (bits_left - (HUFF_LOOKAHEAD)))) & ((1<<(HUFF_LOOKAHEAD))-1)); - if ((nb = tbl.look_nbits[look]) != 0) { -// DROP_BITS(nb); - bits_left -= nb; - s = tbl.look_sym[look] & 0xFF; - } else { - nb = HUFF_LOOKAHEAD+1; -// slowlabel: - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,tbl,nb)) < 0) { -// failaction; - while (num_newnz > 0) - block[newnz_pos[--num_newnz]] = 0; - - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - } - r = s >> 4; - s &= 15; - if (s != 0) { - if (s != 1) { /* size of new coef should always be 1 */ -// WARNMS(cinfo, JWRN_HUFF_BAD_CODE); - } -// CHECK_BIT_BUFFER(br_state, 1, goto undoit); - { - if (bits_left < (1)) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,1)) { -// failaction; - while (num_newnz > 0) - block[newnz_pos[--num_newnz]] = 0; - - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// if (GET_BITS(1)) - if ((( (get_buffer >> (bits_left -= (1)))) & ((1<<(1))-1)) != 0) - s = p1; /* newly nonzero coef is positive */ - else - s = m1; /* newly nonzero coef is negative */ - } else { - if (r != 15) { - EOBRUN = 1 << r; /* EOBr, run length is 2^r + appended bits */ - if (r != 0) { -// CHECK_BIT_BUFFER(br_state, r, goto undoit); - { - if (bits_left < (r)) { - if (!jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,r)) { -// failaction; - while (num_newnz > 0) - block[newnz_pos[--num_newnz]] = 0; - - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// r = GET_BITS(r); - r = (( (get_buffer >> (bits_left -= (r)))) & ((1<<(r))-1)); - EOBRUN += r; - } - break; /* rest of block is handled by EOB logic */ - } - /* note s = 0 for processing ZRL */ - } - /* Advance over already-nonzero coefs and r still-zero coefs, - * appending correction bits to the nonzeroes. A correction bit is 1 - * if the absolute value of the coefficient must be increased. - */ - do { - thiscoef = block; - int thiscoef_offset = jpeg_natural_order[k]; - if (thiscoef[thiscoef_offset] != 0) { -// CHECK_BIT_BUFFER(br_state, 1, goto undoit); - { - if (bits_left < (1)) { - if (!jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,1)) { -// failaction; - while (num_newnz > 0) - block[newnz_pos[--num_newnz]] = 0; - - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// if (GET_BITS(1)) { - if ((( (get_buffer >> (bits_left -= (1)))) & ((1<<(1))-1)) != 0) { - if ((thiscoef[thiscoef_offset] & p1) == 0) { /* do nothing if already set it */ - if (thiscoef[thiscoef_offset] >= 0) - thiscoef[thiscoef_offset] += p1; - else - thiscoef[thiscoef_offset] += m1; - } - } - } else { - if (--r < 0) - break; /* reached target zero coefficient */ - } - k++; - } while (k <= Se); - if (s != 0) { - int pos = jpeg_natural_order[k]; - /* Output newly nonzero coefficient */ - block[pos] = (short) s; - /* Remember its position in case we have to suspend */ - newnz_pos[num_newnz++] = pos; - } - } - } - - if (EOBRUN > 0) { - /* Scan any remaining coefficient positions after the end-of-band - * (the last newly nonzero coefficient, if any). Append a correction - * bit to each already-nonzero coefficient. A correction bit is 1 - * if the absolute value of the coefficient must be increased. - */ - for (; k <= Se; k++) { - thiscoef = block; - int thiscoef_offset = jpeg_natural_order[k]; - if (thiscoef[thiscoef_offset] != 0) { -// CHECK_BIT_BUFFER(br_state, 1, goto undoit); - { - if (bits_left < (1)) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,1)) { -// failaction; - while (num_newnz > 0) - block[newnz_pos[--num_newnz]] = 0; - - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// if (GET_BITS(1)) { - if ((( (get_buffer >> (bits_left -= (1)))) & ((1<<(1))-1)) != 0) { - if ((thiscoef[thiscoef_offset] & p1) == 0) { /* do nothing if already changed it */ - if (thiscoef[thiscoef_offset] >= 0) - thiscoef[thiscoef_offset] += p1; - else - thiscoef[thiscoef_offset] += m1; - } - } - } - } - /* Count one block completed in EOB run */ - EOBRUN--; - } - - /* Completed MCU, so update state */ -// BITREAD_SAVE_STATE(cinfo,entropy.bitstate); - cinfo.buffer = br_state.buffer; - cinfo.bytes_in_buffer = br_state.bytes_in_buffer; - cinfo.bytes_offset = br_state.bytes_offset; - entropy.bitstate.get_buffer = get_buffer; - entropy.bitstate.bits_left = bits_left; - - entropy.saved.EOBRUN = EOBRUN; /* only part of saved state we need */ - } - - /* Account for restart interval (no-op if not using restarts) */ - entropy.restarts_to_go--; - - return true; - -// undoit: -// /* Re-zero any output coefficients that we made newly nonzero */ -// while (num_newnz > 0) -// (*block)[newnz_pos[--num_newnz]] = 0; -// -// return false; - - } - - boolean decode_mcu_AC_first (jpeg_decompress_struct cinfo, short[][] MCU_data) { - phuff_entropy_decoder entropy = this; - int Se = cinfo.Se; - int Al = cinfo.Al; - int s = 0, k, r; - int EOBRUN; - short[] block; -// BITREAD_STATE_VARS; - int get_buffer; - int bits_left; -// bitread_working_state br_state = new bitread_working_state(); - bitread_working_state br_state = br_state_local; - - d_derived_tbl tbl; - - /* Process restart marker if needed; may have to suspend */ - if (cinfo.restart_interval != 0) { - if (entropy.restarts_to_go == 0) - if (! process_restart(cinfo)) - return false; - } - - /* If we've run out of data, just leave the MCU set to zeroes. - * This way, we return uniform gray for the remainder of the segment. - */ - if (! entropy.insufficient_data) { - - /* Load up working state. - * We can avoid loading/saving bitread state if in an EOB run. - */ - EOBRUN = entropy.saved.EOBRUN; /* only part of saved state we need */ - - /* There is always only one block per MCU */ - - if (EOBRUN > 0) /* if it's a band of zeroes... */ - EOBRUN--; /* ...process it now (we do nothing) */ - else { -// BITREAD_LOAD_STATE(cinfo,entropy.bitstate); - br_state.cinfo = cinfo; - br_state.buffer = cinfo.buffer; - br_state.bytes_in_buffer = cinfo.bytes_in_buffer; - br_state.bytes_offset = cinfo.bytes_offset; - get_buffer = entropy.bitstate.get_buffer; - bits_left = entropy.bitstate.bits_left; - - block = MCU_data[0]; - tbl = entropy.ac_derived_tbl; - - for (k = cinfo.Ss; k <= Se; k++) { -// HUFF_DECODE(s, br_state, tbl, return FALSE, label2); - { - int nb = 0, look; - if (bits_left < HUFF_LOOKAHEAD) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left, 0)) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - if (bits_left < HUFF_LOOKAHEAD) { - nb = 1; -// goto slowlabel; - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,tbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - if (nb != 1) { -// look = PEEK_BITS(HUFF_LOOKAHEAD); - look = (( (get_buffer >> (bits_left - (HUFF_LOOKAHEAD)))) & ((1<<(HUFF_LOOKAHEAD))-1)); - - if ((nb = tbl.look_nbits[look]) != 0) { -// DROP_BITS(nb); - bits_left -= nb; - s = tbl.look_sym[look] & 0xFF; - } else { - nb = HUFF_LOOKAHEAD+1; -// slowlabel: - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,tbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - } - r = s >> 4; - s &= 15; - if (s != 0) { - k += r; -// CHECK_BIT_BUFFER(br_state, s, return FALSE); - { - if (bits_left < (s)) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,s)) { - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// r = GET_BITS(s); - r = (( (get_buffer >> (bits_left -= (s)))) & ((1<<(s))-1)); -// s = HUFF_EXTEND(r, s); - s = ((r) < extend_test[s] ? (r) + extend_offset[s] : (r)); - /* Scale and output coefficient in natural (dezigzagged) order */ - block[jpeg_natural_order[k]] = (short) (s << Al); - } else { - if (r == 15) { /* ZRL */ - k += 15; /* skip 15 zeroes in band */ - } else { /* EOBr, run length is 2^r + appended bits */ - EOBRUN = 1 << r; - if (r != 0) { /* EOBr, r > 0 */ -// CHECK_BIT_BUFFER(br_state, r, return FALSE); - { - if (bits_left < (r)) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,r)) { - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// r = GET_BITS(r); - r = (( (get_buffer >> (bits_left -= (r)))) & ((1<<(r))-1)); - EOBRUN += r; - } - EOBRUN--; /* this band is processed at this moment */ - break; /* force end-of-band */ - } - } - } - -// BITREAD_SAVE_STATE(cinfo,entropy.bitstate); - cinfo.buffer = br_state.buffer; - cinfo.bytes_in_buffer = br_state.bytes_in_buffer; - cinfo.bytes_offset = br_state.bytes_offset; - entropy.bitstate.get_buffer = get_buffer; - entropy.bitstate.bits_left = bits_left; - } - - /* Completed MCU, so update state */ - entropy.saved.EOBRUN = EOBRUN; /* only part of saved state we need */ - } - - /* Account for restart interval (no-op if not using restarts) */ - entropy.restarts_to_go--; - - return true; - } - - boolean decode_mcu_DC_first (jpeg_decompress_struct cinfo, short[][] MCU_data) { - phuff_entropy_decoder entropy = this; - int Al = cinfo.Al; - int s = 0, r; - int blkn, ci; - short[] block; -// BITREAD_STATE_VARS; - int get_buffer; - int bits_left; -// bitread_working_state br_state = new bitread_working_state(); - bitread_working_state br_state = br_state_local; - -// savable_state state = new savable_state(); - savable_state state = state_local; - d_derived_tbl tbl; - jpeg_component_info compptr; - - /* Process restart marker if needed; may have to suspend */ - if (cinfo.restart_interval != 0) { - if (entropy.restarts_to_go == 0) - if (! process_restart(cinfo)) - return false; - } - - /* If we've run out of data, just leave the MCU set to zeroes. - * This way, we return uniform gray for the remainder of the segment. - */ - if (! entropy.insufficient_data) { - - /* Load up working state */ -// BITREAD_LOAD_STATE(cinfo,entropy.bitstate); - br_state.cinfo = cinfo; - br_state.buffer = cinfo.buffer; - br_state.bytes_in_buffer = cinfo.bytes_in_buffer; - br_state.bytes_offset = cinfo.bytes_offset; - get_buffer = entropy.bitstate.get_buffer; - bits_left = entropy.bitstate.bits_left; - -// ASSIGN_STATE(state, entropy.saved); - state.EOBRUN = entropy.saved.EOBRUN; - state.last_dc_val[0] = entropy.saved.last_dc_val[0]; - state.last_dc_val[1] = entropy.saved.last_dc_val[1]; - state.last_dc_val[2] = entropy.saved.last_dc_val[2]; - state.last_dc_val[3] = entropy.saved.last_dc_val[3]; - - /* Outer loop handles each block in the MCU */ - - for (blkn = 0; blkn < cinfo.blocks_in_MCU; blkn++) { - block = MCU_data[blkn]; - ci = cinfo.MCU_membership[blkn]; - compptr = cinfo.cur_comp_info[ci]; - tbl = entropy.derived_tbls[compptr.dc_tbl_no]; - - /* Decode a single block's worth of coefficients */ - - /* Section F.2.2.1: decode the DC coefficient difference */ -// HUFF_DECODE(s, br_state, tbl, return FALSE, label1); - { - int nb = 0, look; - if (bits_left < HUFF_LOOKAHEAD) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left, 0)) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - if (bits_left < HUFF_LOOKAHEAD) { - nb = 1; -// goto slowlabel; - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,tbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - if (nb != 1) { -// look = PEEK_BITS(HUFF_LOOKAHEAD); - look = (( (get_buffer >> (bits_left - (HUFF_LOOKAHEAD)))) & ((1<<(HUFF_LOOKAHEAD))-1)); - - if ((nb = tbl.look_nbits[look]) != 0) { -// DROP_BITS(nb); - bits_left -= nb; - s = tbl.look_sym[look] & 0xFF; - } else { - nb = HUFF_LOOKAHEAD+1; -// slowlabel: - if ((s=jpeg_huff_decode(br_state,get_buffer,bits_left,tbl,nb)) < 0) { - return false; - } - get_buffer = br_state.get_buffer; bits_left = br_state.bits_left; - } - } - } - if (s != 0) { -// CHECK_BIT_BUFFER(br_state, s, return FALSE); - { - if (bits_left < (s)) { - if (! jpeg_fill_bit_buffer(br_state,get_buffer,bits_left,s)) { - return false; - } - get_buffer = (br_state).get_buffer; bits_left = (br_state).bits_left; - } - } -// r = GET_BITS(s); - r = (( (get_buffer >> (bits_left -= (s)))) & ((1<<(s))-1)); -// s = HUFF_EXTEND(r, s); - s = ((r) < extend_test[s] ? (r) + extend_offset[s] : (r)); - } - - /* Convert DC difference to actual value, update last_dc_val */ - s += state.last_dc_val[ci]; - state.last_dc_val[ci] = s; - /* Scale and output the coefficient (assumes jpeg_natural_order[0]=0) */ - block[0] = (short) (s << Al); - } - - /* Completed MCU, so update state */ -// BITREAD_SAVE_STATE(cinfo,entropy.bitstate); - cinfo.buffer = br_state.buffer; - cinfo.bytes_in_buffer = br_state.bytes_in_buffer; - cinfo.bytes_offset = br_state.bytes_offset; - entropy.bitstate.get_buffer = get_buffer; - entropy.bitstate.bits_left = bits_left; -// ASSIGN_STATE(entropy.saved, state); - entropy.saved.EOBRUN = state.EOBRUN; - entropy.saved.last_dc_val[0] = state.last_dc_val[0]; - entropy.saved.last_dc_val[1] = state.last_dc_val[1]; - entropy.saved.last_dc_val[2] = state.last_dc_val[2]; - entropy.saved.last_dc_val[3] = state.last_dc_val[3]; - } - - /* Account for restart interval (no-op if not using restarts) */ - entropy.restarts_to_go--; - - return true; - } - - boolean process_restart (jpeg_decompress_struct cinfo) { - phuff_entropy_decoder entropy = this; - int ci; - - /* Throw away any unused bits remaining in bit buffer; */ - /* include any full bytes in next_marker's count of discarded bytes */ - cinfo.marker.discarded_bytes += entropy.bitstate.bits_left / 8; - entropy.bitstate.bits_left = 0; - - /* Advance past the RSTn marker */ - if (! read_restart_marker (cinfo)) - return false; - - /* Re-initialize DC predictions to 0 */ - for (ci = 0; ci < cinfo.comps_in_scan; ci++) - entropy.saved.last_dc_val[ci] = 0; - /* Re-init EOB run count, too */ - entropy.saved.EOBRUN = 0; - - /* Reset restart counter */ - entropy.restarts_to_go = cinfo.restart_interval; - - /* Reset out-of-data flag, unless read_restart_marker left us smack up - * against a marker. In that case we will end up treating the next data - * segment as empty, and we can avoid producing bogus output pixels by - * leaving the flag set. - */ - if (cinfo.unread_marker == 0) - entropy.insufficient_data = false; - - return true; - } - - void start_pass_phuff_decoder (jpeg_decompress_struct cinfo) { - phuff_entropy_decoder entropy = this; - boolean is_DC_band, bad; - int ci, coefi, tbl; - int[] coef_bit_ptr; - jpeg_component_info compptr; - - is_DC_band = (cinfo.Ss == 0); - - /* Validate scan parameters */ - bad = false; - if (is_DC_band) { - if (cinfo.Se != 0) - bad = true; - } else { - /* need not check Ss/Se < 0 since they came from unsigned bytes */ - if (cinfo.Ss > cinfo.Se || cinfo.Se >= DCTSIZE2) - bad = true; - /* AC scans may have only one component */ - if (cinfo.comps_in_scan != 1) - bad = true; - } - if (cinfo.Ah != 0) { - /* Successive approximation refinement scan: must have Al = Ah-1. */ - if (cinfo.Al != cinfo.Ah-1) - bad = true; - } - if (cinfo.Al > 13) /* need not check for < 0 */ - bad = true; - /* Arguably the maximum Al value should be less than 13 for 8-bit precision, - * but the spec doesn't say so, and we try to be liberal about what we - * accept. Note: large Al values could result in out-of-range DC - * coefficients during early scans, leading to bizarre displays due to - * overflows in the IDCT math. But we won't crash. - */ - if (bad) - error(); -// ERREXIT4(cinfo, JERR_BAD_PROGRESSION, cinfo.Ss, cinfo.Se, cinfo.Ah, cinfo.Al); - /* Update progression status, and verify that scan order is legal. - * Note that inter-scan inconsistencies are treated as warnings - * not fatal errors ... not clear if this is right way to behave. - */ - for (ci = 0; ci < cinfo.comps_in_scan; ci++) { - int cindex = cinfo.cur_comp_info[ci].component_index; - coef_bit_ptr = cinfo.coef_bits[cindex]; - if (!is_DC_band && coef_bit_ptr[0] < 0) {/* AC without prior DC scan */ -// WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0); - } - for (coefi = cinfo.Ss; coefi <= cinfo.Se; coefi++) { - int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi]; - if (cinfo.Ah != expected) { -// WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi); - } - coef_bit_ptr[coefi] = cinfo.Al; - } - } - - /* Select MCU decoding routine */ -// if (cinfo.Ah == 0) { -// if (is_DC_band) -// entropy.pub.decode_mcu = decode_mcu_DC_first; -// else -// entropy.pub.decode_mcu = decode_mcu_AC_first; -// } else { -// if (is_DC_band) -// entropy.pub.decode_mcu = decode_mcu_DC_refine; -// else -// entropy.pub.decode_mcu = decode_mcu_AC_refine; -// } - - for (ci = 0; ci < cinfo.comps_in_scan; ci++) { - compptr = cinfo.cur_comp_info[ci]; - /* Make sure requested tables are present, and compute derived tables. - * We may build same derived table more than once, but it's not expensive. - */ - if (is_DC_band) { - if (cinfo.Ah == 0) { /* DC refinement needs no table */ - tbl = compptr.dc_tbl_no; - jpeg_make_d_derived_tbl(cinfo, true, tbl, entropy.derived_tbls[tbl] = new d_derived_tbl()); - } - } else { - tbl = compptr.ac_tbl_no; - jpeg_make_d_derived_tbl(cinfo, false, tbl, entropy.derived_tbls[tbl] = new d_derived_tbl()); - /* remember the single active table */ - entropy.ac_derived_tbl = entropy.derived_tbls[tbl]; - } - /* Initialize DC predictions to 0 */ - entropy.saved.last_dc_val[ci] = 0; - } - - /* Initialize bitread state variables */ - entropy.bitstate.bits_left = 0; - entropy.bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */ - entropy.insufficient_data = false; - - /* Initialize private state variables */ - entropy.saved.EOBRUN = 0; - - /* Initialize restart counter */ - entropy.restarts_to_go = cinfo.restart_interval; - } - - } - - static final class jpeg_component_info { - /* These values are fixed over the whole image. */ - /* For compression, they must be supplied by parameter setup; */ - /* for decompression, they are read from the SOF marker. */ - int component_id; /* identifier for this component (0..255) */ - int component_index; /* its index in SOF or cinfo.comp_info[] */ - int h_samp_factor; /* horizontal sampling factor (1..4) */ - int v_samp_factor; /* vertical sampling factor (1..4) */ - int quant_tbl_no; /* quantization table selector (0..3) */ - /* These values may vary between scans. */ - /* For compression, they must be supplied by parameter setup; */ - /* for decompression, they are read from the SOS marker. */ - /* The decompressor output side may not use these variables. */ - int dc_tbl_no; /* DC entropy table selector (0..3) */ - int ac_tbl_no; /* AC entropy table selector (0..3) */ - - /* Remaining fields should be treated as private by applications. */ - - /* These values are computed during compression or decompression startup: */ - /* Component's size in DCT blocks. - * Any dummy blocks added to complete an MCU are not counted; therefore - * these values do not depend on whether a scan is interleaved or not. - */ - int width_in_blocks; - int height_in_blocks; - /* Size of a DCT block in samples. Always DCTSIZE for compression. - * For decompression this is the size of the output from one DCT block, - * reflecting any scaling we choose to apply during the IDCT step. - * Values of 1,2,4,8 are likely to be supported. Note that different - * components may receive different IDCT scalings. - */ - int DCT_scaled_size; - /* The downsampled dimensions are the component's actual, unpadded number - * of samples at the main buffer (preprocessing/compression interface), thus - * downsampled_width = ceil(image_width * Hi/Hmax) - * and similarly for height. For decompression, IDCT scaling is included, so - * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) - */ - int downsampled_width; /* actual width in samples */ - int downsampled_height; /* actual height in samples */ - /* This flag is used only for decompression. In cases where some of the - * components will be ignored (eg grayscale output from YCbCr image), - * we can skip most computations for the unused components. - */ - boolean component_needed; /* do we need the value of this component? */ - - /* These values are computed before starting a scan of the component. */ - /* The decompressor output side may not use these variables. */ - int MCU_width; /* number of blocks per MCU, horizontally */ - int MCU_height; /* number of blocks per MCU, vertically */ - int MCU_blocks; /* MCU_width * MCU_height */ - int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ - int last_col_width; /* # of non-dummy blocks across in last MCU */ - int last_row_height; /* # of non-dummy blocks down in last MCU */ - - /* Saved quantization table for component; null if none yet saved. - * See jdinput.c comments about the need for this information. - * This field is currently used only for decompression. - */ - JQUANT_TBL quant_table; - - /* Private per-component storage for DCT or IDCT subsystem. */ - int[] dct_table; - } - - static final class jpeg_color_quantizer { -// JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan)); -// JMETHOD(void, color_quantize, (j_decompress_ptr cinfo, -// JSAMPARRAY input_buf, JSAMPARRAY output_buf, -// int num_rows)); -// JMETHOD(void, finish_pass, (j_decompress_ptr cinfo)); -// JMETHOD(void, new_color_map, (j_decompress_ptr cinfo)); - - /* Initially allocated colormap is saved here */ - int[][] sv_colormap; /* The color map as a 2-D pixel array */ - int sv_actual; /* number of entries in use */ - - int[][] colorindex; /* Precomputed mapping for speed */ - /* colorindex[i][j] = index of color closest to pixel value j in component i, - * premultiplied as described above. Since colormap indexes must fit into - * JSAMPLEs, the entries of this array will too. - */ - boolean is_padded; /* is the colorindex padded for odither? */ - - int[] Ncolors = new int [MAX_Q_COMPS]; /* # of values alloced to each component */ - - /* Variables for ordered dithering */ - int row_index; /* cur row's vertical index in dither matrix */ -// ODITHER_MATRIX_PTR odither[MAX_Q_COMPS]; /* one dither array per component */ - - /* Variables for Floyd-Steinberg dithering */ -// FSERRPTR fserrors[MAX_Q_COMPS]; /* accumulated errors */ - boolean on_odd_row; - - void start_pass (jpeg_decompress_struct cinfo, boolean is_pre_scan) { - error(); - } - } - - static final class jpeg_upsampler { -// JMETHOD(void, start_pass, (j_decompress_ptr cinfo)); -// JMETHOD(void, upsample, (j_decompress_ptr cinfo, -// JSAMPIMAGE input_buf, -// JDIMENSION *in_row_group_ctr, -// JDIMENSION in_row_groups_avail, -// JSAMPARRAY output_buf, -// JDIMENSION *out_row_ctr, -// JDIMENSION out_rows_avail)); - - boolean need_context_rows; /* TRUE if need rows above & below */ - - /* Color conversion buffer. When using separate upsampling and color - * conversion steps, this buffer holds one upsampled row group until it - * has been color converted and output. - * Note: we do not allocate any storage for component(s) which are full-size, - * ie do not need rescaling. The corresponding entry of color_buf[] is - * simply set to point to the input data array, thereby avoiding copying. - */ - byte[][][] color_buf = new byte[MAX_COMPONENTS][][]; - int[] color_buf_offset = new int[MAX_COMPONENTS]; - - /* Per-component upsampling method pointers */ - int[] methods = new int[MAX_COMPONENTS]; - - int next_row_out; /* counts rows emitted from color_buf */ - int rows_to_go; /* counts rows remaining in image */ - - /* Height of an input row group for each component. */ - int[] rowgroup_height = new int[MAX_COMPONENTS]; - - /* These arrays save pixel expansion factors so that int_expand need not - * recompute them each time. They are unused for other upsampling methods. - */ - byte[] h_expand = new byte[MAX_COMPONENTS]; - byte[] v_expand = new byte[MAX_COMPONENTS]; - - void start_pass (jpeg_decompress_struct cinfo) { - jpeg_upsampler upsample = cinfo.upsample; - - /* Mark the conversion buffer empty */ - upsample.next_row_out = cinfo.max_v_samp_factor; - /* Initialize total-height counter for detecting bottom of image */ - upsample.rows_to_go = cinfo.output_height; - } - - } - - static final class jpeg_marker_reader { - /* Read a restart marker --- exported for use by entropy decoder only */ -// jpeg_marker_parser_method read_restart_marker; - - /* State of marker reader --- nominally internal, but applications - * supplying COM or APPn handlers might like to know the state. - */ - boolean saw_SOI; /* found SOI? */ - boolean saw_SOF; /* found SOF? */ - int next_restart_num; /* next restart number expected (0-7) */ - int discarded_bytes; /* # of bytes skipped looking for a marker */ - - /* Application-overridable marker processing methods */ -// jpeg_marker_parser_method process_COM; -// jpeg_marker_parser_method process_APPn[16]; - - /* Limit on marker data length to save for each marker type */ - int length_limit_COM; - int[] length_limit_APPn = new int[16]; - - /* Status of COM/APPn marker saving */ -// jpeg_marker_reader cur_marker; /* null if not processing a marker */ -// int bytes_read; /* data bytes read so far in marker */ - /* Note: cur_marker is not linked into marker_list until it's all read. */ - } - - - static final class jpeg_d_main_controller { -// JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)); - int process_data; - - /* Pointer to allocated workspace (M or M+2 row groups). */ - byte[][][] buffer = new byte[MAX_COMPONENTS][][]; - int[] buffer_offset = new int[MAX_COMPONENTS]; - - boolean buffer_full; /* Have we gotten an iMCU row from decoder? */ - int[] rowgroup_ctr = new int[1]; /* counts row groups output to postprocessor */ - - /* Remaining fields are only used in the context case. */ - - /* These are the master pointers to the funny-order pointer lists. */ - byte[][][][] xbuffer = new byte[2][][][]; /* pointers to weird pointer lists */ - int[][] xbuffer_offset = new int[2][]; - - int whichptr; /* indicates which pointer set is now in use */ - int context_state; /* process_data state machine status */ - int rowgroups_avail; /* row groups available to postprocessor */ - int iMCU_row_ctr; /* counts iMCU rows to detect image top/bot */ - - void start_pass (jpeg_decompress_struct cinfo, int pass_mode) { - jpeg_d_main_controller main = cinfo.main; - - switch (pass_mode) { - case JBUF_PASS_THRU: - if (cinfo.upsample.need_context_rows) { - main.process_data = PROCESS_DATA_CONTEXT_MAIN; - make_funny_pointers(cinfo); /* Create the xbuffer[] lists */ - main.whichptr = 0; /* Read first iMCU row into xbuffer[0] */ - main.context_state = CTX_PREPARE_FOR_IMCU; - main.iMCU_row_ctr = 0; - } else { - /* Simple case with no context needed */ - main.process_data = PROCESS_DATA_SIMPLE_MAIN; - } - main.buffer_full = false; /* Mark buffer empty */ - main.rowgroup_ctr[0] = 0; - break; -// #ifdef QUANT_2PASS_SUPPORTED -// case JBUF_CRANK_DEST: -// /* For last pass of 2-pass quantization, just crank the postprocessor */ -// main.process_data = PROCESS_DATA_CRANK_POST; -// break; -// #endif - default: - error(); -// ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); - break; - } - } - - } - - static final class jpeg_decomp_master { -// JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo)); -// JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo)); - - /* State variables made visible to other modules */ - boolean is_dummy_pass; - - int pass_number; /* # of passes completed */ - - boolean using_merged_upsample; /* true if using merged upsample/cconvert */ - - /* Saved references to initialized quantizer modules, - * in case we need to switch modes. - */ - jpeg_color_quantizer quantizer_1pass; - jpeg_color_quantizer quantizer_2pass; - } - - static final class jpeg_inverse_dct { -// JMETHOD(void, start_pass, (j_decompress_ptr cinfo)); -// /* It is useful to allow each component to have a separate IDCT method. */ -// inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS]; - int[] cur_method = new int[MAX_COMPONENTS]; - - void start_pass (jpeg_decompress_struct cinfo) { - jpeg_inverse_dct idct = cinfo.idct; - int ci, i; - jpeg_component_info compptr; - int method = 0; -// inverse_DCT_method_ptr method_ptr = NULL; - JQUANT_TBL qtbl; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* Select the proper IDCT routine for this component's scaling */ - switch (compptr.DCT_scaled_size) { -// #ifdef IDCT_SCALING_SUPPORTED -// case 1: -// method_ptr = jpeg_idct_1x1; -// method = JDCT_ISLOW; /* jidctred uses islow-style table */ -// break; -// case 2: -// method_ptr = jpeg_idct_2x2; -// method = JDCT_ISLOW; /* jidctred uses islow-style table */ -// break; -// case 4: -// method_ptr = jpeg_idct_4x4; -// method = JDCT_ISLOW; /* jidctred uses islow-style table */ -// break; -// #endif - case DCTSIZE: - switch (cinfo.dct_method) { -// #ifdef DCT_ISLOW_SUPPORTED - case JDCT_ISLOW: -// method_ptr = jpeg_idct_islow; - method = JDCT_ISLOW; - break; -// #endif -// #ifdef DCT_IFAST_SUPPORTED -// case JDCT_IFAST: -// method_ptr = jpeg_idct_ifast; -// method = JDCT_IFAST; -// break; -// #endif -// #ifdef DCT_FLOAT_SUPPORTED -// case JDCT_FLOAT: -// method_ptr = jpeg_idct_float; -// method = JDCT_FLOAT; -// break; -// #endif - default: - error(); -// ERREXIT(cinfo, JERR_NOT_COMPILED); - break; - } - break; - default: - error(); -// ERREXIT1(cinfo, JERR_BAD_DCTSIZE, compptr.DCT_scaled_size); - break; - } -// idct.inverse_DCT[ci] = method_ptr; - /* Create multiplier table from quant table. - * However, we can skip this if the component is uninteresting - * or if we already built the table. Also, if no quant table - * has yet been saved for the component, we leave the - * multiplier table all-zero; we'll be reading zeroes from the - * coefficient controller's buffer anyway. - */ - if (! compptr.component_needed || idct.cur_method[ci] == method) - continue; - qtbl = compptr.quant_table; - if (qtbl == null) /* happens if no data yet for component */ - continue; - idct.cur_method[ci] = method; - switch (method) { -// #ifdef PROVIDE_ISLOW_TABLES - case JDCT_ISLOW: - { - /* For LL&M IDCT method, multipliers are equal to raw quantization - * coefficients, but are stored as ints to ensure access efficiency. - */ - int[] ismtbl = compptr.dct_table; - for (i = 0; i < DCTSIZE2; i++) { - ismtbl[i] = qtbl.quantval[i]; - } - } - break; -// #endif -// #ifdef DCT_IFAST_SUPPORTED -// case JDCT_IFAST: -// { -// /* For AA&N IDCT method, multipliers are equal to quantization -// * coefficients scaled by scalefactor[row]*scalefactor[col], where -// * scalefactor[0] = 1 -// * scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7 -// * For integer operation, the multiplier table is to be scaled by -// * IFAST_SCALE_BITS. -// */ -// int[] ifmtbl = compptr.dct_table; -// short aanscales[] = { -// /* precomputed values scaled up by 14 bits */ -// 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520, -// 22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270, -// 21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906, -// 19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315, -// 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520, -// 12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552, -// 8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446, -// 4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247 -// }; -// SHIFT_TEMPS -// -// for (i = 0; i < DCTSIZE2; i++) { -// ifmtbl[i] = DESCALE(MULTIPLY16V16( qtbl.quantval[i], aanscales[i]), CONST_BITS-IFAST_SCALE_BITS); -// } -// } -// break; -// #endif -// #ifdef DCT_FLOAT_SUPPORTED -// case JDCT_FLOAT: -// { -// /* For float AA&N IDCT method, multipliers are equal to quantization -// * coefficients scaled by scalefactor[row]*scalefactor[col], where -// * scalefactor[0] = 1 -// * scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7 -// */ -// FLOAT_MULT_TYPE * fmtbl = (FLOAT_MULT_TYPE *) compptr.dct_table; -// int row, col; -// static const double aanscalefactor[DCTSIZE] = { -// 1.0, 1.387039845, 1.306562965, 1.175875602, -// 1.0, 0.785694958, 0.541196100, 0.275899379 -// }; -// -// i = 0; -// for (row = 0; row < DCTSIZE; row++) { -// for (col = 0; col < DCTSIZE; col++) { -// fmtbl[i] = (FLOAT_MULT_TYPE) -// ((double) qtbl.quantval[i] * -// aanscalefactor[row] * aanscalefactor[col]); -// i++; -// } -// } -// } -// break; -// #endif - default: - error(); -// ERREXIT(cinfo, JERR_NOT_COMPILED); - break; - } - } - } - } - - static final class jpeg_input_controller { - int consume_input; - boolean has_multiple_scans; /* True if file has multiple scans */ - boolean eoi_reached; - - boolean inheaders; /* true until first SOS is reached */ - } - - static final class jpeg_color_deconverter { -// JMETHOD(void, start_pass, (j_decompress_ptr cinfo)); - int color_convert; - - /* Private state for YCC.RGB conversion */ - int[] Cr_r_tab; /* => table for Cr to R conversion */ - int[] Cb_b_tab; /* => table for Cb to B conversion */ - int[] Cr_g_tab; /* => table for Cr to G conversion */ - int[] Cb_g_tab; /* => table for Cb to G conversion */ - - void start_pass (jpeg_decompress_struct cinfo) { - /* no work needed */ - } - - } - - static final class jpeg_d_post_controller { -// JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)); - int post_process_data; - - /* Color quantization source buffer: this holds output data from - * the upsample/color conversion step to be passed to the quantizer. - * For two-pass color quantization, we need a full-image buffer; - * for one-pass operation, a strip buffer is sufficient. - */ - int[] whole_image; /* virtual array, or NULL if one-pass */ - int[][] buffer; /* strip buffer, or current strip of virtual */ - int strip_height; /* buffer size in rows */ - /* for two-pass mode only: */ - int starting_row; /* row # of first row in current strip */ - int next_row; /* index of next row to fill/empty in strip */ - - void start_pass (jpeg_decompress_struct cinfo, int pass_mode) { - jpeg_d_post_controller post = cinfo.post; - - switch (pass_mode) { - case JBUF_PASS_THRU: - if (cinfo.quantize_colors) { - error(SWT.ERROR_NOT_IMPLEMENTED); -// /* Single-pass processing with color quantization. */ -// post.post_process_data = POST_PROCESS_1PASS; -// /* We could be doing buffered-image output before starting a 2-pass -// * color quantization; in that case, jinit_d_post_controller did not -// * allocate a strip buffer. Use the virtual-array buffer as workspace. -// */ -// if (post.buffer == null) { -// post.buffer = (*cinfo.mem.access_virt_sarray) -// ((j_common_ptr) cinfo, post.whole_image, -// (JDIMENSION) 0, post.strip_height, TRUE); -// } - } else { - /* For single-pass processing without color quantization, - * I have no work to do; just call the upsampler directly. - */ - post.post_process_data = POST_PROCESS_DATA_UPSAMPLE; - } - break; -// #ifdef QUANT_2PASS_SUPPORTED -// case JBUF_SAVE_AND_PASS: -// /* First pass of 2-pass quantization */ -// if (post.whole_image == NULL) -// ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); -// post.pub.post_process_data = post_process_prepass; -// break; -// case JBUF_CRANK_DEST: -// /* Second pass of 2-pass quantization */ -// if (post.whole_image == NULL) -// ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); -// post.pub.post_process_data = post_process_2pass; -// break; -// #endif /* QUANT_2PASS_SUPPORTED */ - default: - error(); -// ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); - break; - } - post.starting_row = post.next_row = 0; - } - - } - - static final class jpeg_decompress_struct { -// jpeg_error_mgr * err; /* Error handler module */\ -// struct jpeg_memory_mgr * mem; /* Memory manager module */\ -// struct jpeg_progress_mgr * progress; /* Progress monitor, or null if none */\ -// void * client_data; /* Available for use by application */\ - boolean is_decompressor; /* So common code can tell which is which */ - int global_state; /* For checking call sequence validity */ - -// /* Source of compressed data */ -// struct jpeg_source_mgr * src; - InputStream inputStream; - byte[] buffer; - int bytes_in_buffer; - int bytes_offset; - boolean start_of_file; - - /* Basic description of image --- filled in by jpeg_read_header(). */ - /* Application may inspect these values to decide how to process image. */ - - int image_width; /* nominal image width (from SOF marker) */ - int image_height; /* nominal image height */ - int num_components; /* # of color components in JPEG image */ - int jpeg_color_space; /* colorspace of JPEG image */ - - /* Decompression processing parameters --- these fields must be set before - * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes - * them to default values. - */ - - int out_color_space; /* colorspace for output */ - - int scale_num, scale_denom; /* fraction by which to scale image */ - - double output_gamma; /* image gamma wanted in output */ - - boolean buffered_image; /* true=multiple output passes */ - boolean raw_data_out; /* true=downsampled data wanted */ - - int dct_method; /* IDCT algorithm selector */ - boolean do_fancy_upsampling; /* true=apply fancy upsampling */ - boolean do_block_smoothing; /* true=apply interblock smoothing */ - - boolean quantize_colors; /* true=colormapped output wanted */ - /* the following are ignored if not quantize_colors: */ - int dither_mode; /* type of color dithering to use */ - boolean two_pass_quantize; /* true=use two-pass color quantization */ - int desired_number_of_colors; /* max # colors to use in created colormap */ - /* these are significant only in buffered-image mode: */ - boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ - boolean enable_external_quant;/* enable future use of external colormap */ - boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ - - /* Description of actual output image that will be returned to application. - * These fields are computed by jpeg_start_decompress(). - * You can also use jpeg_calc_output_dimensions() to determine these values - * in advance of calling jpeg_start_decompress(). - */ - - int output_width; /* scaled image width */ - int output_height; /* scaled image height */ - int out_color_components; /* # of color components in out_color_space */ - int output_components; /* # of color components returned */ - /* output_components is 1 (a colormap index) when quantizing colors; - * otherwise it equals out_color_components. - */ - int rec_outbuf_height; /* min recommended height of scanline buffer */ - /* If the buffer passed to jpeg_read_scanlines() is less than this many rows - * high, space and time will be wasted due to unnecessary data copying. - * Usually rec_outbuf_height will be 1 or 2, at most 4. - */ - - /* When quantizing colors, the output colormap is described by these fields. - * The application can supply a colormap by setting colormap non-null before - * calling jpeg_start_decompress; otherwise a colormap is created during - * jpeg_start_decompress or jpeg_start_output. - * The map has out_color_components rows and actual_number_of_colors columns. - */ - int actual_number_of_colors; /* number of entries in use */ - int[] colormap; /* The color map as a 2-D pixel array */ - - /* State variables: these variables indicate the progress of decompression. - * The application may examine these but must not modify them. - */ - - /* Row index of next scanline to be read from jpeg_read_scanlines(). - * Application may use this to control its processing loop, e.g., - * "while (output_scanline < output_height)". - */ - int output_scanline; /* 0 .. output_height-1 */ - - /* Current input scan number and number of iMCU rows completed in scan. - * These indicate the progress of the decompressor input side. - */ - int input_scan_number; /* Number of SOS markers seen so far */ - int input_iMCU_row; /* Number of iMCU rows completed */ - - /* The "output scan number" is the notional scan being displayed by the - * output side. The decompressor will not allow output scan/row number - * to get ahead of input scan/row, but it can fall arbitrarily far behind. - */ - int output_scan_number; /* Nominal scan number being displayed */ - int output_iMCU_row; /* Number of iMCU rows read */ - - /* Current progression status. coef_bits[c][i] indicates the precision - * with which component c's DCT coefficient i (in zigzag order) is known. - * It is -1 when no data has yet been received, otherwise it is the point - * transform (shift) value for the most recent scan of the coefficient - * (thus, 0 at completion of the progression). - * This pointer is null when reading a non-progressive file. - */ - int[][] coef_bits; /* -1 or current Al value for each coef */ - - /* Internal JPEG parameters --- the application usually need not look at - * these fields. Note that the decompressor output side may not use - * any parameters that can change between scans. - */ - - /* Quantization and Huffman tables are carried forward across input - * datastreams when processing abbreviated JPEG datastreams. - */ - - JQUANT_TBL[] quant_tbl_ptrs = new JQUANT_TBL[NUM_QUANT_TBLS]; - /* ptrs to coefficient quantization tables, or null if not defined */ - - JHUFF_TBL[] dc_huff_tbl_ptrs = new JHUFF_TBL[NUM_HUFF_TBLS]; - JHUFF_TBL[] ac_huff_tbl_ptrs = new JHUFF_TBL[NUM_HUFF_TBLS]; - /* ptrs to Huffman coding tables, or null if not defined */ - - /* These parameters are never carried across datastreams, since they - * are given in SOF/SOS markers or defined to be reset by SOI. - */ - - int data_precision; /* bits of precision in image data */ - - jpeg_component_info[] comp_info; - /* comp_info[i] describes component that appears i'th in SOF */ - - boolean progressive_mode; /* true if SOFn specifies progressive mode */ - boolean arith_code; /* true=arithmetic coding, false=Huffman */ - - byte[] arith_dc_L = new byte[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ - byte[] arith_dc_U = new byte[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ - byte[] arith_ac_K = new byte[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ - - int restart_interval; /* MCUs per restart interval, or 0 for no restart */ - - /* These fields record data obtained from optional markers recognized by - * the JPEG library. - */ - boolean saw_JFIF_marker; /* true iff a JFIF APP0 marker was found */ - /* Data copied from JFIF marker; only valid if saw_JFIF_marker is true: */ - byte JFIF_major_version; /* JFIF version number */ - byte JFIF_minor_version; - byte density_unit; /* JFIF code for pixel size units */ - short X_density; /* Horizontal pixel density */ - short Y_density; /* Vertical pixel density */ - boolean saw_Adobe_marker; /* true iff an Adobe APP14 marker was found */ - byte Adobe_transform; /* Color transform code from Adobe marker */ - - boolean CCIR601_sampling; /* true=first samples are cosited */ - - /* Aside from the specific data retained from APPn markers known to the - * library, the uninterpreted contents of any or all APPn and COM markers - * can be saved in a list for examination by the application. - */ - jpeg_marker_reader marker_list; /* Head of list of saved markers */ - - /* Remaining fields are known throughout decompressor, but generally - * should not be touched by a surrounding application. - */ - - /* - * These fields are computed during decompression startup - */ - int max_h_samp_factor; /* largest h_samp_factor */ - int max_v_samp_factor; /* largest v_samp_factor */ - - int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ - - int total_iMCU_rows; /* # of iMCU rows in image */ - /* The coefficient controller's input and output progress is measured in - * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows - * in fully interleaved JPEG scans, but are used whether the scan is - * interleaved or not. We define an iMCU row as v_samp_factor DCT block - * rows of each component. Therefore, the IDCT output contains - * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. - */ - - byte[] sample_range_limit; /* table for fast range-limiting */ - int sample_range_limit_offset; - - /* - * These fields are valid during any one scan. - * They describe the components and MCUs actually appearing in the scan. - * Note that the decompressor output side must not use these fields. - */ - int comps_in_scan; /* # of JPEG components in this scan */ - jpeg_component_info[] cur_comp_info = new jpeg_component_info[MAX_COMPS_IN_SCAN]; - /* *cur_comp_info[i] describes component that appears i'th in SOS */ - - int MCUs_per_row; /* # of MCUs across the image */ - int MCU_rows_in_scan; /* # of MCU rows in the image */ - - int blocks_in_MCU; /* # of DCT blocks per MCU */ - int[] MCU_membership = new int[D_MAX_BLOCKS_IN_MCU]; - /* MCU_membership[i] is index in cur_comp_info of component owning */ - /* i'th block in an MCU */ - - int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ - - /* This field is shared between entropy decoder and marker parser. - * It is either zero or the code of a JPEG marker that has been - * read from the data source, but has not yet been processed. - */ - int unread_marker; - - int[] workspace = new int[DCTSIZE2]; - int[] row_ctr = new int[1]; - - /* - * Links to decompression subobjects (methods, private variables of modules) - */ - jpeg_decomp_master master; - jpeg_d_main_controller main; - jpeg_d_coef_controller coef; - jpeg_d_post_controller post; - jpeg_input_controller inputctl; - jpeg_marker_reader marker; - jpeg_entropy_decoder entropy; - jpeg_inverse_dct idct; - jpeg_upsampler upsample; - jpeg_color_deconverter cconvert; - jpeg_color_quantizer cquantize; - } - -static void error() { - SWT.error(SWT.ERROR_INVALID_IMAGE); -} - -static void error(int code) { - SWT.error(code); -} - -static void error(String msg) { - SWT.error(SWT.ERROR_INVALID_IMAGE, null, msg); -} - -static void jinit_marker_reader (jpeg_decompress_struct cinfo) { - jpeg_marker_reader marker = cinfo.marker = new jpeg_marker_reader(); -// int i; - - /* Initialize COM/APPn processing. - * By default, we examine and then discard APP0 and APP14, - * but simply discard COM and all other APPn. - */ -// marker.process_COM = skip_variable; - marker.length_limit_COM = 0; -// for (i = 0; i < 16; i++) { -// marker.process_APPn[i] = skip_variable; -// marker.length_limit_APPn[i] = 0; -// } -// marker.process_APPn[0] = get_interesting_appn; -// marker.process_APPn[14] = get_interesting_appn; - /* Reset marker processing state */ - reset_marker_reader(cinfo); -} - -static void jinit_d_coef_controller (jpeg_decompress_struct cinfo, boolean need_full_buffer) { - jpeg_d_coef_controller coef = new jpeg_d_coef_controller(); - cinfo.coef = coef; -// coef.pub.start_input_pass = start_input_pass; -// coef.pub.start_output_pass = start_output_pass; - coef.coef_bits_latch = null; - - /* Create the coefficient buffer. */ - if (need_full_buffer) { -//#ifdef D_MULTISCAN_FILES_SUPPORTED - /* Allocate a full-image virtual array for each component, */ - /* padded to a multiple of samp_factor DCT blocks in each direction. */ - /* Note we ask for a pre-zeroed array. */ - int ci, access_rows; - jpeg_component_info compptr; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - access_rows = compptr.v_samp_factor; -//#ifdef BLOCK_SMOOTHING_SUPPORTED - /* If block smoothing could be used, need a bigger window */ - if (cinfo.progressive_mode) - access_rows *= 3; -//#endif - coef.whole_image[ci] = - new short - [(int)jround_up( compptr.height_in_blocks, compptr.v_samp_factor)] - [(int)jround_up( compptr.width_in_blocks, compptr.h_samp_factor)] - [DCTSIZE2]; - } -// coef.consume_data = consume_data; - coef.decompress_data = DECOMPRESS_DATA; - coef.coef_arrays = coef.whole_image[0]; /* link to virtual arrays */ -// #else -// ERREXIT(cinfo, JERR_NOT_COMPILED); -// #endif - } else { - /* We only need a single-MCU buffer. */ - coef.MCU_buffer = new short[D_MAX_BLOCKS_IN_MCU][DCTSIZE2]; -// coef.consume_data = dummy_consume_data; - coef.decompress_data = DECOMPRESS_ONEPASS; - coef.coef_arrays = null; /* flag for no virtual arrays */ - } -} - -static void start_output_pass (jpeg_decompress_struct cinfo) { -//#ifdef BLOCK_SMOOTHING_SUPPORTED - jpeg_d_coef_controller coef = cinfo.coef; - - /* If multipass, check to see whether to use block smoothing on this pass */ - if (coef.coef_arrays != null) { - if (cinfo.do_block_smoothing && smoothing_ok(cinfo)) - coef.decompress_data = DECOMPRESS_SMOOTH_DATA; - else - coef.decompress_data = DECOMPRESS_DATA; - } -//#endif - cinfo.output_iMCU_row = 0; -} - -static void jpeg_create_decompress(jpeg_decompress_struct cinfo) { - cinfo.is_decompressor = true; - - - /* Initialize marker processor so application can override methods - * for COM, APPn markers before calling jpeg_read_header. - */ - cinfo.marker_list = null; - jinit_marker_reader(cinfo); - - /* And initialize the overall input controller. */ - jinit_input_controller(cinfo); - - /* OK, I'm ready */ - cinfo.global_state = DSTATE_START; -} - -static void jpeg_calc_output_dimensions (jpeg_decompress_struct cinfo) -/* Do computations that are needed before master selection phase */ -{ -//#ifdef IDCT_SCALING_SUPPORTED -// int ci; -// jpeg_component_info compptr; -//#endif - - /* Prevent application from calling me at wrong times */ - if (cinfo.global_state != DSTATE_READY) - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - -//#ifdef IDCT_SCALING_SUPPORTED -// -// /* Compute actual output image dimensions and DCT scaling choices. */ -// if (cinfo.scale_num * 8 <= cinfo.scale_denom) { -// /* Provide 1/8 scaling */ -// cinfo.output_width = (int) -// jdiv_round_up(cinfo.image_width, 8L); -// cinfo.output_height = (int) -// jdiv_round_up(cinfo.image_height, 8L); -// cinfo.min_DCT_scaled_size = 1; -// } else if (cinfo.scale_num * 4 <= cinfo.scale_denom) { -// /* Provide 1/4 scaling */ -// cinfo.output_width = (int) -// jdiv_round_up(cinfo.image_width, 4L); -// cinfo.output_height = (int) -// jdiv_round_up(cinfo.image_height, 4L); -// cinfo.min_DCT_scaled_size = 2; -// } else if (cinfo.scale_num * 2 <= cinfo.scale_denom) { -// /* Provide 1/2 scaling */ -// cinfo.output_width = (int) -// jdiv_round_up(cinfo.image_width, 2L); -// cinfo.output_height = (int) -// jdiv_round_up(cinfo.image_height, 2L); -// cinfo.min_DCT_scaled_size = 4; -// } else { -// /* Provide 1/1 scaling */ -// cinfo.output_width = cinfo.image_width; -// cinfo.output_height = cinfo.image_height; -// cinfo.min_DCT_scaled_size = DCTSIZE; -// } -// /* In selecting the actual DCT scaling for each component, we try to -// * scale up the chroma components via IDCT scaling rather than upsampling. -// * This saves time if the upsampler gets to use 1:1 scaling. -// * Note this code assumes that the supported DCT scalings are powers of 2. -// */ -// for (ci = 0; ci < cinfo.num_components; ci++) { -// compptr = cinfo.comp_info[ci]; -// int ssize = cinfo.min_DCT_scaled_size; -// while (ssize < DCTSIZE && -// (compptr.h_samp_factor * ssize * 2 <= cinfo.max_h_samp_factor * cinfo.min_DCT_scaled_size) && -// (compptr.v_samp_factor * ssize * 2 <= cinfo.max_v_samp_factor * cinfo.min_DCT_scaled_size)) -// { -// ssize = ssize * 2; -// } -// compptr.DCT_scaled_size = ssize; -// } -// -// /* Recompute downsampled dimensions of components; -// * application needs to know these if using raw downsampled data. -// */ -// for (ci = 0; ci < cinfo.num_components; ci++) { -// compptr = cinfo.comp_info[ci]; -// /* Size in samples, after IDCT scaling */ -// compptr.downsampled_width = (int) -// jdiv_round_up((long) cinfo.image_width * (long) (compptr.h_samp_factor * compptr.DCT_scaled_size), -// (cinfo.max_h_samp_factor * DCTSIZE)); -// compptr.downsampled_height = (int) -// jdiv_round_up((long) cinfo.image_height * (long) (compptr.v_samp_factor * compptr.DCT_scaled_size), -// (cinfo.max_v_samp_factor * DCTSIZE)); -// } -// -//#else /* !IDCT_SCALING_SUPPORTED */ - - /* Hardwire it to "no scaling" */ - cinfo.output_width = cinfo.image_width; - cinfo.output_height = cinfo.image_height; - /* jdinput.c has already initialized DCT_scaled_size to DCTSIZE, - * and has computed unscaled downsampled_width and downsampled_height. - */ - -//#endif /* IDCT_SCALING_SUPPORTED */ - - /* Report number of components in selected colorspace. */ - /* Probably this should be in the color conversion module... */ - switch (cinfo.out_color_space) { - case JCS_GRAYSCALE: - cinfo.out_color_components = 1; - break; - case JCS_RGB: - case JCS_YCbCr: - cinfo.out_color_components = 3; - break; - case JCS_CMYK: - case JCS_YCCK: - cinfo.out_color_components = 4; - break; - default: /* else must be same colorspace as in file */ - cinfo.out_color_components = cinfo.num_components; - break; - } - cinfo.output_components = (cinfo.quantize_colors ? 1 : cinfo.out_color_components); - - /* See if upsampler will want to emit more than one row at a time */ - if (use_merged_upsample(cinfo)) - cinfo.rec_outbuf_height = cinfo.max_v_samp_factor; - else - cinfo.rec_outbuf_height = 1; -} - -static boolean use_merged_upsample (jpeg_decompress_struct cinfo) { -//#ifdef UPSAMPLE_MERGING_SUPPORTED - /* Merging is the equivalent of plain box-filter upsampling */ - if (cinfo.do_fancy_upsampling || cinfo.CCIR601_sampling) - return false; - /* jdmerge.c only supports YCC=>RGB color conversion */ - if (cinfo.jpeg_color_space != JCS_YCbCr || cinfo.num_components != 3 || - cinfo.out_color_space != JCS_RGB || - cinfo.out_color_components != RGB_PIXELSIZE) - return false; - /* and it only handles 2h1v or 2h2v sampling ratios */ - if (cinfo.comp_info[0].h_samp_factor != 2 || - cinfo.comp_info[1].h_samp_factor != 1 || - cinfo.comp_info[2].h_samp_factor != 1 || - cinfo.comp_info[0].v_samp_factor > 2 || - cinfo.comp_info[1].v_samp_factor != 1 || - cinfo.comp_info[2].v_samp_factor != 1) - return false; - /* furthermore, it doesn't work if we've scaled the IDCTs differently */ - if (cinfo.comp_info[0].DCT_scaled_size != cinfo.min_DCT_scaled_size || - cinfo.comp_info[1].DCT_scaled_size != cinfo.min_DCT_scaled_size || - cinfo.comp_info[2].DCT_scaled_size != cinfo.min_DCT_scaled_size) - return false; - /* ??? also need to test for upsample-time rescaling, when & if supported */ - return true; /* by golly, it'll work... */ -//#else -// return false; -//#endif -} - -static void prepare_range_limit_table (jpeg_decompress_struct cinfo) -/* Allocate and fill in the sample_range_limit table */ -{ - byte[] table; - int i; - - table = new byte[5 * (MAXJSAMPLE+1) + CENTERJSAMPLE]; - int offset = (MAXJSAMPLE+1); /* allow negative subscripts of simple table */ - cinfo.sample_range_limit_offset = offset; - cinfo.sample_range_limit = table; - /* First segment of "simple" table: limit[x] = 0 for x < 0 */ - /* Main part of "simple" table: limit[x] = x */ - for (i = 0; i <= MAXJSAMPLE; i++) - table[i + offset] = (byte)i; - offset += CENTERJSAMPLE; /* Point to where post-IDCT table starts */ - /* End of simple table, rest of first half of post-IDCT table */ - for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++) - table[i+offset] = (byte)MAXJSAMPLE; - /* Second half of post-IDCT table */ - System.arraycopy(cinfo.sample_range_limit, cinfo.sample_range_limit_offset, table, offset + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE), CENTERJSAMPLE); -} - -static void build_ycc_rgb_table (jpeg_decompress_struct cinfo) { - jpeg_color_deconverter cconvert = cinfo.cconvert; - int i; - int x; -// SHIFT_TEMPS - - cconvert.Cr_r_tab = new int[MAXJSAMPLE+1]; - cconvert.Cb_b_tab = new int[MAXJSAMPLE+1]; - cconvert.Cr_g_tab = new int[MAXJSAMPLE+1]; - cconvert.Cb_g_tab = new int[MAXJSAMPLE+1]; - - for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { - /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ - /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ - /* Cr=>R value is nearest int to 1.40200 * x */ - cconvert.Cr_r_tab[i] = ((int)(1.40200f * (1<<SCALEBITS) + 0.5f) * x + ONE_HALF) >> SCALEBITS; - /* Cb=>B value is nearest int to 1.77200 * x */ - cconvert.Cb_b_tab[i] = ((int)(1.77200f * (1<<SCALEBITS) + 0.5f) * x + ONE_HALF) >> SCALEBITS; - /* Cr=>G value is scaled-up -0.71414 * x */ - cconvert.Cr_g_tab[i] = ((int)(- (0.71414f * (1<<SCALEBITS) + 0.5f)) * x); - /* Cb=>G value is scaled-up -0.34414 * x */ - /* We also add in ONE_HALF so that need not do it in inner loop */ - cconvert.Cb_g_tab[i] = ((int)(- (0.34414f* (1<<SCALEBITS) + 0.5f)) * x + ONE_HALF); - } -} - -static void jinit_color_deconverter (jpeg_decompress_struct cinfo) { - jpeg_color_deconverter cconvert = cinfo.cconvert = new jpeg_color_deconverter(); -// cconvert.start_pass = start_pass_dcolor; - - /* Make sure num_components agrees with jpeg_color_space */ - switch (cinfo.jpeg_color_space) { - case JCS_GRAYSCALE: - if (cinfo.num_components != 1) - error(); -// ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); - break; - - case JCS_RGB: - case JCS_YCbCr: - if (cinfo.num_components != 3) - error(); -// ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); - break; - - case JCS_CMYK: - case JCS_YCCK: - if (cinfo.num_components != 4) - error(); -// ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); - break; - - default: /* JCS_UNKNOWN can be anything */ - if (cinfo.num_components < 1) - error(); -// ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); - break; - } - - /* Set out_color_components and conversion method based on requested space. - * Also clear the component_needed flags for any unused components, - * so that earlier pipeline stages can avoid useless computation. - */ - - int ci; - switch (cinfo.out_color_space) { - case JCS_GRAYSCALE: - cinfo.out_color_components = 1; - if (cinfo.jpeg_color_space == JCS_GRAYSCALE || cinfo.jpeg_color_space == JCS_YCbCr) { - cconvert.color_convert = GRAYSCALE_CONVERT; - /* For color.grayscale conversion, only the Y (0) component is needed */ - for (ci = 1; ci < cinfo.num_components; ci++) - cinfo.comp_info[ci].component_needed = false; - } else - error(); -// ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); - break; - - case JCS_RGB: - cinfo.out_color_components = RGB_PIXELSIZE; - if (cinfo.jpeg_color_space == JCS_YCbCr) { - cconvert.color_convert = YCC_RGB_CONVERT; - build_ycc_rgb_table(cinfo); - } else if (cinfo.jpeg_color_space == JCS_GRAYSCALE) { - cconvert.color_convert = GRAY_RGB_CONVERT; - } else if (cinfo.jpeg_color_space == JCS_RGB) { - cconvert.color_convert = NULL_CONVERT; - } else - error(); -// ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); - break; - - case JCS_CMYK: - cinfo.out_color_components = 4; - if (cinfo.jpeg_color_space == JCS_YCCK) { - cconvert.color_convert = YCCK_CMYK_CONVERT; - build_ycc_rgb_table(cinfo); - } else if (cinfo.jpeg_color_space == JCS_CMYK) { - cconvert.color_convert = NULL_CONVERT; - } else - error(); -// ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); - break; - - default: - /* Permit null conversion to same output space */ - if (cinfo.out_color_space == cinfo.jpeg_color_space) { - cinfo.out_color_components = cinfo.num_components; - cconvert.color_convert = NULL_CONVERT; - } else /* unsupported non-null conversion */ - error(); -// ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); - break; - } - - if (cinfo.quantize_colors) - cinfo.output_components = 1; /* single colormapped output component */ - else - cinfo.output_components = cinfo.out_color_components; -} - -static void jinit_d_post_controller (jpeg_decompress_struct cinfo, boolean need_full_buffer) { - jpeg_d_post_controller post = cinfo.post = new jpeg_d_post_controller(); -// post.pub.start_pass = start_pass_dpost; - post.whole_image = null; /* flag for no virtual arrays */ - post.buffer = null; /* flag for no strip buffer */ - - /* Create the quantization buffer, if needed */ - if (cinfo.quantize_colors) { - error(SWT.ERROR_NOT_IMPLEMENTED); -// /* The buffer strip height is max_v_samp_factor, which is typically -// * an efficient number of rows for upsampling to return. -// * (In the presence of output rescaling, we might want to be smarter?) -// */ -// post.strip_height = cinfo.max_v_samp_factor; -// if (need_full_buffer) { -// /* Two-pass color quantization: need full-image storage. */ -// /* We round up the number of rows to a multiple of the strip height. */ -//#ifdef QUANT_2PASS_SUPPORTED -// post.whole_image = (*cinfo.mem.request_virt_sarray) -// ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, -// cinfo.output_width * cinfo.out_color_components, -// (JDIMENSION) jround_up((long) cinfo.output_height, -// (long) post.strip_height), -// post.strip_height); -//#else -// ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); -//#endif /* QUANT_2PASS_SUPPORTED */ -// } else { -// /* One-pass color quantization: just make a strip buffer. */ -// post.buffer = (*cinfo.mem.alloc_sarray) -// ((j_common_ptr) cinfo, JPOOL_IMAGE, -// cinfo.output_width * cinfo.out_color_components, -// post.strip_height); -// } - } -} - -static void make_funny_pointers (jpeg_decompress_struct cinfo) -/* Create the funny pointer lists discussed in the comments above. - * The actual workspace is already allocated (in main.buffer), - * and the space for the pointer lists is allocated too. - * This routine just fills in the curiously ordered lists. - * This will be repeated at the beginning of each pass. - */ -{ - jpeg_d_main_controller main = cinfo.main; - int ci, i, rgroup; - int M = cinfo.min_DCT_scaled_size; - jpeg_component_info compptr; - byte[][] buf, xbuf0, xbuf1; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - rgroup = (compptr.v_samp_factor * compptr.DCT_scaled_size) / - cinfo.min_DCT_scaled_size; /* height of a row group of component */ - xbuf0 = main.xbuffer[0][ci]; - int xbuf0_offset = main.xbuffer_offset[0][ci]; - xbuf1 = main.xbuffer[1][ci]; - int xbuf1_offset = main.xbuffer_offset[1][ci]; - /* First copy the workspace pointers as-is */ - buf = main.buffer[ci]; - for (i = 0; i < rgroup * (M + 2); i++) { - xbuf0[i + xbuf0_offset] = xbuf1[i + xbuf1_offset] = buf[i]; - } - /* In the second list, put the last four row groups in swapped order */ - for (i = 0; i < rgroup * 2; i++) { - xbuf1[rgroup*(M-2) + i + xbuf1_offset] = buf[rgroup*M + i]; - xbuf1[rgroup*M + i + xbuf1_offset] = buf[rgroup*(M-2) + i]; - } - /* The wraparound pointers at top and bottom will be filled later - * (see set_wraparound_pointers, below). Initially we want the "above" - * pointers to duplicate the first actual data line. This only needs - * to happen in xbuffer[0]. - */ - for (i = 0; i < rgroup; i++) { - xbuf0[i - rgroup + xbuf0_offset] = xbuf0[0 + xbuf0_offset]; - } - } -} - -static void alloc_funny_pointers (jpeg_decompress_struct cinfo) -/* Allocate space for the funny pointer lists. - * This is done only once, not once per pass. - */ -{ - jpeg_d_main_controller main = cinfo.main; - int ci, rgroup; - int M = cinfo.min_DCT_scaled_size; - jpeg_component_info compptr; - byte[][] xbuf; - - /* Get top-level space for component array pointers. - * We alloc both arrays with one call to save a few cycles. - */ - main.xbuffer[0] = new byte[cinfo.num_components][][]; - main.xbuffer[1] = new byte[cinfo.num_components][][]; - main.xbuffer_offset[0] = new int[cinfo.num_components]; - main.xbuffer_offset[1] = new int[cinfo.num_components]; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - rgroup = (compptr.v_samp_factor * compptr.DCT_scaled_size) / cinfo.min_DCT_scaled_size; /* height of a row group of component */ - /* Get space for pointer lists --- M+4 row groups in each list. - * We alloc both pointer lists with one call to save a few cycles. - */ - xbuf = new byte[2 * (rgroup * (M + 4))][]; - int offset = rgroup; - main.xbuffer_offset[0][ci] = offset; - main.xbuffer[0][ci] = xbuf; - offset += rgroup * (M + 4); - main.xbuffer_offset[1][ci] = offset; - main.xbuffer[1][ci] = xbuf; - } -} - - -static void jinit_d_main_controller (jpeg_decompress_struct cinfo, boolean need_full_buffer) { - int ci, rgroup, ngroups; - jpeg_component_info compptr; - - jpeg_d_main_controller main = cinfo.main = new jpeg_d_main_controller(); -// main.pub.start_pass = start_pass_main; - - if (need_full_buffer) /* shouldn't happen */ - error(); -// ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); - - /* Allocate the workspace. - * ngroups is the number of row groups we need. - */ - if (cinfo.upsample.need_context_rows) { - if (cinfo.min_DCT_scaled_size < 2) /* unsupported, see comments above */ - error(); -// ERREXIT(cinfo, JERR_NOTIMPL); - alloc_funny_pointers(cinfo); /* Alloc space for xbuffer[] lists */ - ngroups = cinfo.min_DCT_scaled_size + 2; - } else { - ngroups = cinfo.min_DCT_scaled_size; - } - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - rgroup = (compptr.v_samp_factor * compptr.DCT_scaled_size) / cinfo.min_DCT_scaled_size; /* height of a row group of component */ - main.buffer[ci] = new byte[rgroup * ngroups][compptr.width_in_blocks * compptr.DCT_scaled_size]; - } -} - -static long jround_up (long a, long b) -/* Compute a rounded up to next multiple of b, ie, ceil(a/b)*b */ -/* Assumes a >= 0, b > 0 */ -{ - a += b - 1L; - return a - (a % b); -} - -static void jinit_upsampler (jpeg_decompress_struct cinfo) { - int ci; - jpeg_component_info compptr; - boolean need_buffer, do_fancy; - int h_in_group, v_in_group, h_out_group, v_out_group; - - jpeg_upsampler upsample = new jpeg_upsampler(); - cinfo.upsample = upsample; -// upsample.start_pass = start_pass_upsample; -// upsample.upsample = sep_upsample; - upsample.need_context_rows = false; /* until we find out differently */ - - if (cinfo.CCIR601_sampling) /* this isn't supported */ - error(); -// ERREXIT(cinfo, JERR_CCIR601_NOTIMPL); - - /* jdmainct.c doesn't support context rows when min_DCT_scaled_size = 1, - * so don't ask for it. - */ - do_fancy = cinfo.do_fancy_upsampling && cinfo.min_DCT_scaled_size > 1; - - /* Verify we can handle the sampling factors, select per-component methods, - * and create storage as needed. - */ - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* Compute size of an "input group" after IDCT scaling. This many samples - * are to be converted to max_h_samp_factor * max_v_samp_factor pixels. - */ - h_in_group = (compptr.h_samp_factor * compptr.DCT_scaled_size) / - cinfo.min_DCT_scaled_size; - v_in_group = (compptr.v_samp_factor * compptr.DCT_scaled_size) / - cinfo.min_DCT_scaled_size; - h_out_group = cinfo.max_h_samp_factor; - v_out_group = cinfo.max_v_samp_factor; - upsample.rowgroup_height[ci] = v_in_group; /* save for use later */ - need_buffer = true; - if (! compptr.component_needed) { - /* Don't bother to upsample an uninteresting component. */ - upsample.methods[ci] = NOOP_UPSAMPLE; - need_buffer = false; - } else if (h_in_group == h_out_group && v_in_group == v_out_group) { - /* Fullsize components can be processed without any work. */ - upsample.methods[ci] = FULLSIZE_UPSAMPLE; - need_buffer = false; - } else if (h_in_group * 2 == h_out_group && v_in_group == v_out_group) { - /* Special cases for 2h1v upsampling */ - if (do_fancy && compptr.downsampled_width > 2) - upsample.methods[ci] = H2V1_FANCY_UPSAMPLE; - else - upsample.methods[ci] = H2V1_UPSAMPLE; - } else if (h_in_group * 2 == h_out_group && v_in_group * 2 == v_out_group) { - /* Special cases for 2h2v upsampling */ - if (do_fancy && compptr.downsampled_width > 2) { - upsample.methods[ci] = H2V2_FANCY_UPSAMPLE; - upsample.need_context_rows = true; - } else - upsample.methods[ci] = H2V2_UPSAMPLE; - } else if ((h_out_group % h_in_group) == 0 && (v_out_group % v_in_group) == 0) { - /* Generic integral-factors upsampling method */ - upsample.methods[ci] = INT_UPSAMPLE; - upsample.h_expand[ci] = (byte) (h_out_group / h_in_group); - upsample.v_expand[ci] = (byte) (v_out_group / v_in_group); - } else - error(); -// ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL); - if (need_buffer) { - upsample.color_buf[ci] = new byte[cinfo.max_v_samp_factor] - [(int) jround_up(cinfo.output_width, cinfo.max_h_samp_factor)]; - } - } -} - -static void jinit_phuff_decoder (jpeg_decompress_struct cinfo) { - int[][] coef_bit_ptr; - int ci, i; - - cinfo.entropy = new phuff_entropy_decoder(); -// entropy.pub.start_pass = start_pass_phuff_decoder; - - /* Create progression status table */ - cinfo.coef_bits = new int[cinfo.num_components][DCTSIZE2]; - coef_bit_ptr = cinfo.coef_bits; - for (ci = 0; ci < cinfo.num_components; ci++) - for (i = 0; i < DCTSIZE2; i++) - coef_bit_ptr[ci][i] = -1; -} - - -static void jinit_huff_decoder (jpeg_decompress_struct cinfo) { - - cinfo.entropy = new huff_entropy_decoder(); -// entropy.pub.start_pass = start_pass_huff_decoder; -// entropy.pub.decode_mcu = decode_mcu; - -} - -static void jinit_inverse_dct (jpeg_decompress_struct cinfo) { - int ci; - jpeg_component_info compptr; - - jpeg_inverse_dct idct = cinfo.idct = new jpeg_inverse_dct(); -// idct.pub.start_pass = start_pass; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* Allocate and pre-zero a multiplier table for each component */ - compptr.dct_table = new int[DCTSIZE2]; - /* Mark multiplier table not yet set up for any method */ - idct.cur_method[ci] = -1; - } -} - -static final int CONST_BITS = 13; -static final int PASS1_BITS = 2; -static final int RANGE_MASK =(MAXJSAMPLE * 4 + 3); -static void jpeg_idct_islow (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - short[] coef_block, - byte[][] output_buf, int output_buf_offset, int output_col) -{ - int tmp0, tmp1, tmp2, tmp3; - int tmp10, tmp11, tmp12, tmp13; - int z1, z2, z3, z4, z5; - short[] inptr; - int[] quantptr; - int[] wsptr; - byte[] outptr; - byte[] range_limit = cinfo.sample_range_limit; - int range_limit_offset = cinfo.sample_range_limit_offset + CENTERJSAMPLE; - int ctr; - int[] workspace = cinfo.workspace; /* buffers data between passes */ -// SHIFT_TEMPS - - /* Pass 1: process columns from input, store into work array. */ - /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ - /* furthermore, we scale the results by 2**PASS1_BITS. */ - - inptr = coef_block; - quantptr = compptr.dct_table; - wsptr = workspace; - int inptr_offset = 0, quantptr_offset = 0, wsptr_offset = 0; - for (ctr = DCTSIZE; ctr > 0; ctr--) { - /* Due to quantization, we will usually find that many of the input - * coefficients are zero, especially the AC terms. We can exploit this - * by short-circuiting the IDCT calculation for any column in which all - * the AC terms are zero. In that case each output is equal to the - * DC coefficient (with scale factor as needed). - * With typical images and quantization tables, half or more of the - * column DCT calculations can be simplified this way. - */ - - if (inptr[DCTSIZE*1+inptr_offset] == 0 && inptr[DCTSIZE*2+inptr_offset] == 0 && - inptr[DCTSIZE*3+inptr_offset] == 0 && inptr[DCTSIZE*4+inptr_offset] == 0 && - inptr[DCTSIZE*5+inptr_offset] == 0 && inptr[DCTSIZE*6+inptr_offset] == 0 && - inptr[DCTSIZE*7+inptr_offset] == 0) - { - /* AC terms all zero */ - int dcval = ((inptr[DCTSIZE*0+inptr_offset]) * quantptr[DCTSIZE*0+quantptr_offset]) << PASS1_BITS; - - wsptr[DCTSIZE*0+wsptr_offset] = dcval; - wsptr[DCTSIZE*1+wsptr_offset] = dcval; - wsptr[DCTSIZE*2+wsptr_offset] = dcval; - wsptr[DCTSIZE*3+wsptr_offset] = dcval; - wsptr[DCTSIZE*4+wsptr_offset] = dcval; - wsptr[DCTSIZE*5+wsptr_offset] = dcval; - wsptr[DCTSIZE*6+wsptr_offset] = dcval; - wsptr[DCTSIZE*7+wsptr_offset] = dcval; - - inptr_offset++; /* advance pointers to next column */ - quantptr_offset++; - wsptr_offset++; - continue; - } - - /* Even part: reverse the even part of the forward DCT. */ - /* The rotator is sqrt(2)*c(-6). */ - - z2 = ((inptr[DCTSIZE*2+inptr_offset]) * quantptr[DCTSIZE*2+quantptr_offset]); - z3 = ((inptr[DCTSIZE*6+inptr_offset]) * quantptr[DCTSIZE*6+quantptr_offset]); - - z1 = ((z2 + z3) * 4433/*FIX_0_541196100*/); - tmp2 = z1 + (z3 * - 15137/*FIX_1_847759065*/); - tmp3 = z1 + (z2 * 6270/*FIX_0_765366865*/); - - z2 = ((inptr[DCTSIZE*0+inptr_offset]) * quantptr[DCTSIZE*0+quantptr_offset]); - z3 = ((inptr[DCTSIZE*4+inptr_offset]) * quantptr[DCTSIZE*4+quantptr_offset]); - - tmp0 = (z2 + z3) << CONST_BITS; - tmp1 = (z2 - z3) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - - /* Odd part per figure 8; the matrix is unitary and hence its - * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. - */ - - tmp0 = ((inptr[DCTSIZE*7+inptr_offset]) * quantptr[DCTSIZE*7+quantptr_offset]); - tmp1 = ((inptr[DCTSIZE*5+inptr_offset]) * quantptr[DCTSIZE*5+quantptr_offset]); - tmp2 = ((inptr[DCTSIZE*3+inptr_offset]) * quantptr[DCTSIZE*3+quantptr_offset]); - tmp3 = ((inptr[DCTSIZE*1+inptr_offset]) * quantptr[DCTSIZE*1+quantptr_offset]); - - z1 = tmp0 + tmp3; - z2 = tmp1 + tmp2; - z3 = tmp0 + tmp2; - z4 = tmp1 + tmp3; - z5 = ((z3 + z4) * 9633/*FIX_1_175875602*/); /* sqrt(2) * c3 */ - - tmp0 = (tmp0 * 2446/*FIX_0_298631336*/); /* sqrt(2) * (-c1+c3+c5-c7) */ - tmp1 = (tmp1 * 16819/*FIX_2_053119869*/); /* sqrt(2) * ( c1+c3-c5+c7) */ - tmp2 = (tmp2 * 25172/*FIX_3_072711026*/); /* sqrt(2) * ( c1+c3+c5-c7) */ - tmp3 = (tmp3 * 12299/*FIX_1_501321110*/); /* sqrt(2) * ( c1+c3-c5-c7) */ - z1 = (z1 * - 7373/*FIX_0_899976223*/); /* sqrt(2) * (c7-c3) */ - z2 = (z2 * - 20995/*FIX_2_562915447*/); /* sqrt(2) * (-c1-c3) */ - z3 = (z3 * - 16069/*FIX_1_961570560*/); /* sqrt(2) * (-c3-c5) */ - z4 = (z4 * - 3196/*FIX_0_390180644*/); /* sqrt(2) * (c5-c3) */ - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - - /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ - -// #define DESCALE(x,n) RIGHT_SHIFT((x) + (ONE << ((n)-1)), n) - wsptr[DCTSIZE*0+wsptr_offset] = (((tmp10 + tmp3) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - wsptr[DCTSIZE*7+wsptr_offset] = (((tmp10 - tmp3) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - wsptr[DCTSIZE*1+wsptr_offset] = (((tmp11 + tmp2) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - wsptr[DCTSIZE*6+wsptr_offset] = (((tmp11 - tmp2) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - wsptr[DCTSIZE*2+wsptr_offset] = (((tmp12 + tmp1) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - wsptr[DCTSIZE*5+wsptr_offset] = (((tmp12 - tmp1) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - wsptr[DCTSIZE*3+wsptr_offset] = (((tmp13 + tmp0) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - wsptr[DCTSIZE*4+wsptr_offset] = (((tmp13 - tmp0) + (1 << ((CONST_BITS-PASS1_BITS)-1))) >> (CONST_BITS-PASS1_BITS)); - - inptr_offset++; /* advance pointers to next column */ - quantptr_offset++; - wsptr_offset++; - } - - - /* Pass 2: process rows from work array, store into output array. */ - /* Note that we must descale the results by a factor of 8 == 2**3, */ - /* and also undo the PASS1_BITS scaling. */ - - int outptr_offset = 0; - wsptr = workspace; - wsptr_offset =0; - for (ctr = 0; ctr < DCTSIZE; ctr++) { - outptr = output_buf[ctr+output_buf_offset]; - outptr_offset = output_col; - /* Rows of zeroes can be exploited in the same way as we did with columns. - * However, the column calculation has created many nonzero AC terms, so - * the simplification applies less often (typically 5% to 10% of the time). - * On machines with very fast multiplication, it's possible that the - * test takes more time than it's worth. In that case this section - * may be commented out. - */ - -//#ifndef NO_ZERO_ROW_TEST - if (wsptr[1+wsptr_offset] == 0 && wsptr[2+wsptr_offset] == 0 && wsptr[3+wsptr_offset] == 0 && wsptr[4+wsptr_offset] == 0 && - wsptr[5+wsptr_offset] == 0 && wsptr[6+wsptr_offset] == 0 && wsptr[7+wsptr_offset] == 0) - { - /* AC terms all zero */ -// #define DESCALE(x,n) RIGHT_SHIFT((x) + (ONE << ((n)-1)), n) - byte dcval = range_limit[range_limit_offset + ((((wsptr[0+wsptr_offset]) + (1 << ((PASS1_BITS+3)-1))) >> PASS1_BITS+3) - & RANGE_MASK)]; - - outptr[0+outptr_offset] = dcval; - outptr[1+outptr_offset] = dcval; - outptr[2+outptr_offset] = dcval; - outptr[3+outptr_offset] = dcval; - outptr[4+outptr_offset] = dcval; - outptr[5+outptr_offset] = dcval; - outptr[6+outptr_offset] = dcval; - outptr[7+outptr_offset] = dcval; - - wsptr_offset += DCTSIZE; /* advance pointer to next row */ - continue; - } -//#endif - - /* Even part: reverse the even part of the forward DCT. */ - /* The rotator is sqrt(2)*c(-6). */ - - z2 = wsptr[2+wsptr_offset]; - z3 = wsptr[6+wsptr_offset]; - - z1 = ((z2 + z3) * 4433/*FIX_0_541196100*/); - tmp2 = z1 + (z3 * - 15137/*FIX_1_847759065*/); - tmp3 = z1 + (z2 * 6270/*FIX_0_765366865*/); - - tmp0 = (wsptr[0+wsptr_offset] + wsptr[4+wsptr_offset]) << CONST_BITS; - tmp1 = (wsptr[0+wsptr_offset] - wsptr[4+wsptr_offset]) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - - /* Odd part per figure 8; the matrix is unitary and hence its - * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. - */ - - tmp0 = wsptr[7+wsptr_offset]; - tmp1 = wsptr[5+wsptr_offset]; - tmp2 = wsptr[3+wsptr_offset]; - tmp3 = wsptr[1+wsptr_offset]; - - z1 = tmp0 + tmp3; - z2 = tmp1 + tmp2; - z3 = tmp0 + tmp2; - z4 = tmp1 + tmp3; - z5 = ((z3 + z4) * 9633/*FIX_1_175875602*/); /* sqrt(2) * c3 */ - - tmp0 = (tmp0 * 2446/*FIX_0_298631336*/); /* sqrt(2) * (-c1+c3+c5-c7) */ - tmp1 = (tmp1 * 16819/*FIX_2_053119869*/); /* sqrt(2) * ( c1+c3-c5+c7) */ - tmp2 = (tmp2 * 25172/*FIX_3_072711026*/); /* sqrt(2) * ( c1+c3+c5-c7) */ - tmp3 = (tmp3 * 12299/*FIX_1_501321110*/); /* sqrt(2) * ( c1+c3-c5-c7) */ - z1 = (z1 * - 7373/*FIX_0_899976223*/); /* sqrt(2) * (c7-c3) */ - z2 = (z2 * - 20995/*FIX_2_562915447*/); /* sqrt(2) * (-c1-c3) */ - z3 = (z3 * - 16069/*FIX_1_961570560*/); /* sqrt(2) * (-c3-c5) */ - z4 = (z4 * - 3196/*FIX_0_390180644*/); /* sqrt(2) * (c5-c3) */ - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - - /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ - - -// #define DESCALE(x,n) RIGHT_SHIFT((x) + (ONE << ((n)-1)), n) - outptr[0+outptr_offset] = range_limit[range_limit_offset + ((((tmp10 + tmp3) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - outptr[7+outptr_offset] = range_limit[range_limit_offset + ((((tmp10 - tmp3) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - outptr[1+outptr_offset] = range_limit[range_limit_offset + ((((tmp11 + tmp2) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - outptr[6+outptr_offset] = range_limit[range_limit_offset + ((((tmp11 - tmp2) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - outptr[2+outptr_offset] = range_limit[range_limit_offset + ((((tmp12 + tmp1) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - outptr[5+outptr_offset] = range_limit[range_limit_offset + ((((tmp12 - tmp1) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - outptr[3+outptr_offset] = range_limit[range_limit_offset + ((((tmp13 + tmp0) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - outptr[4+outptr_offset] = range_limit[range_limit_offset + ((((tmp13 - tmp0) + (1 << ((CONST_BITS+PASS1_BITS+3)-1))) >> - CONST_BITS+PASS1_BITS+3) - & RANGE_MASK)]; - - wsptr_offset += DCTSIZE; /* advance pointer to next row */ - } -} - -static void upsample (jpeg_decompress_struct cinfo, - byte[][][] input_buf, int[] input_buf_offset, int[] in_row_group_ctr, - int in_row_groups_avail, - byte[][] output_buf, int[] out_row_ctr, - int out_rows_avail) -{ - sep_upsample(cinfo, input_buf, input_buf_offset, in_row_group_ctr, in_row_groups_avail, output_buf, out_row_ctr, out_rows_avail); -} - -static boolean smoothing_ok (jpeg_decompress_struct cinfo) { - jpeg_d_coef_controller coef = cinfo.coef; - boolean smoothing_useful = false; - int ci, coefi; - jpeg_component_info compptr; - JQUANT_TBL qtable; - int[] coef_bits; - int[] coef_bits_latch; - - if (! cinfo.progressive_mode || cinfo.coef_bits == null) - return false; - - /* Allocate latch area if not already done */ - if (coef.coef_bits_latch == null) - coef.coef_bits_latch = new int[cinfo.num_components * SAVED_COEFS]; - coef_bits_latch = coef.coef_bits_latch; - int coef_bits_latch_offset = 0; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* All components' quantization values must already be latched. */ - if ((qtable = compptr.quant_table) == null) - return false; - /* Verify DC & first 5 AC quantizers are nonzero to avoid zero-divide. */ - if (qtable.quantval[0] == 0 || - qtable.quantval[Q01_POS] == 0 || - qtable.quantval[Q10_POS] == 0 || - qtable.quantval[Q20_POS] == 0 || - qtable.quantval[Q11_POS] == 0 || - qtable.quantval[Q02_POS] == 0) - return false; - /* DC values must be at least partly known for all components. */ - coef_bits = cinfo.coef_bits[ci]; - if (coef_bits[0] < 0) - return false; - /* Block smoothing is helpful if some AC coefficients remain inaccurate. */ - for (coefi = 1; coefi <= 5; coefi++) { - coef_bits_latch[coefi+coef_bits_latch_offset] = coef_bits[coefi]; - if (coef_bits[coefi] != 0) - smoothing_useful = true; - } - coef_bits_latch_offset += SAVED_COEFS; - } - - return smoothing_useful; -} - -static void master_selection (jpeg_decompress_struct cinfo) { - jpeg_decomp_master master = cinfo.master; - boolean use_c_buffer; - long samplesperrow; - int jd_samplesperrow; - - /* Initialize dimensions and other stuff */ - jpeg_calc_output_dimensions(cinfo); - prepare_range_limit_table(cinfo); - - /* Width of an output scanline must be representable as JDIMENSION. */ - samplesperrow = (long) cinfo.output_width * (long) cinfo.out_color_components; - jd_samplesperrow = (int) samplesperrow; - if ( jd_samplesperrow != samplesperrow) - error(); -// ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); - - /* Initialize my private state */ - master.pass_number = 0; - master.using_merged_upsample = use_merged_upsample(cinfo); - - /* Color quantizer selection */ - master.quantizer_1pass = null; - master.quantizer_2pass = null; - /* No mode changes if not using buffered-image mode. */ - if (! cinfo.quantize_colors || ! cinfo.buffered_image) { - cinfo.enable_1pass_quant = false; - cinfo.enable_external_quant = false; - cinfo.enable_2pass_quant = false; - } - if (cinfo.quantize_colors) { - error(SWT.ERROR_NOT_IMPLEMENTED); -// if (cinfo.raw_data_out) -// ERREXIT(cinfo, JERR_NOTIMPL); -// /* 2-pass quantizer only works in 3-component color space. */ -// if (cinfo.out_color_components != 3) { -// cinfo.enable_1pass_quant = true; -// cinfo.enable_external_quant = false; -// cinfo.enable_2pass_quant = false; -// cinfo.colormap = null; -// } else if (cinfo.colormap != null) { -// cinfo.enable_external_quant = true; -// } else if (cinfo.two_pass_quantize) { -// cinfo.enable_2pass_quant = true; -// } else { -// cinfo.enable_1pass_quant = true; -// } -// -// if (cinfo.enable_1pass_quant) { -//#ifdef QUANT_1PASS_SUPPORTED -// jinit_1pass_quantizer(cinfo); -// master.quantizer_1pass = cinfo.cquantize; -//#else -// ERREXIT(cinfo, JERR_NOT_COMPILED); -//#endif -// } -// -// /* We use the 2-pass code to map to external colormaps. */ -// if (cinfo.enable_2pass_quant || cinfo.enable_external_quant) { -//#ifdef QUANT_2PASS_SUPPORTED -// jinit_2pass_quantizer(cinfo); -// master.quantizer_2pass = cinfo.cquantize; -//#else -// ERREXIT(cinfo, JERR_NOT_COMPILED); -//#endif -// } -// /* If both quantizers are initialized, the 2-pass one is left active; -// * this is necessary for starting with quantization to an external map. -// */ - } - - /* Post-processing: in particular, color conversion first */ - if (! cinfo.raw_data_out) { - if (master.using_merged_upsample) { -//#ifdef UPSAMPLE_MERGING_SUPPORTED -// jinit_merged_upsampler(cinfo); /* does color conversion too */ -//#else - error(); -// ERREXIT(cinfo, JERR_NOT_COMPILED); -//#endif - } else { - jinit_color_deconverter(cinfo); - jinit_upsampler(cinfo); - } - jinit_d_post_controller(cinfo, cinfo.enable_2pass_quant); - } - /* Inverse DCT */ - jinit_inverse_dct(cinfo); - /* Entropy decoding: either Huffman or arithmetic coding. */ - if (cinfo.arith_code) { - error(); -// ERREXIT(cinfo, JERR_ARITH_NOTIMPL); - } else { - if (cinfo.progressive_mode) { -//#ifdef D_PROGRESSIVE_SUPPORTED - jinit_phuff_decoder(cinfo); -//#else -// ERREXIT(cinfo, JERR_NOT_COMPILED); -//#endif - } else - jinit_huff_decoder(cinfo); - } - - /* Initialize principal buffer controllers. */ - use_c_buffer = cinfo.inputctl.has_multiple_scans || cinfo.buffered_image; - jinit_d_coef_controller(cinfo, use_c_buffer); - - if (! cinfo.raw_data_out) - jinit_d_main_controller(cinfo, false /* never need full buffer here */); - - /* Initialize input side of decompressor to consume first scan. */ - start_input_pass (cinfo); - -//#ifdef D_MULTISCAN_FILES_SUPPORTED - /* If jpeg_start_decompress will read the whole file, initialize - * progress monitoring appropriately. The input step is counted - * as one pass. - */ -// if (cinfo.progress != null && ! cinfo.buffered_image && -// cinfo.inputctl.has_multiple_scans) { -// int nscans; -// /* Estimate number of scans to set pass_limit. */ -// if (cinfo.progressive_mode) { -// /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */ -// nscans = 2 + 3 * cinfo.num_components; -// } else { -// /* For a nonprogressive multiscan file, estimate 1 scan per component. */ -// nscans = cinfo.num_components; -// } -// cinfo.progress.pass_counter = 0L; -// cinfo.progress.pass_limit = (long) cinfo.total_iMCU_rows * nscans; -// cinfo.progress.completed_passes = 0; -// cinfo.progress.total_passes = (cinfo.enable_2pass_quant ? 3 : 2); -// /* Count the input pass as done */ -// master.pass_number++; -// } -//#endif /* D_MULTISCAN_FILES_SUPPORTED */ -} - -static void jinit_master_decompress (jpeg_decompress_struct cinfo) { - jpeg_decomp_master master = new jpeg_decomp_master(); - cinfo.master = master; -// master.prepare_for_output_pass = prepare_for_output_pass; -// master.finish_output_pass = finish_output_pass; - - master.is_dummy_pass = false; - - master_selection(cinfo); -} - -static void -jcopy_sample_rows (byte[][] input_array, int source_row, - byte[][] output_array, int dest_row, - int num_rows, int num_cols) -/* Copy some rows of samples from one place to another. - * num_rows rows are copied from input_array[source_row++] - * to output_array[dest_row++]; these areas may overlap for duplication. - * The source and destination arrays must be at least as wide as num_cols. - */ -{ - byte[] inptr, outptr; - int count = num_cols; - int row; - - int input_array_offset = source_row; - int output_array_offset = dest_row; - - for (row = num_rows; row > 0; row--) { - inptr = input_array[input_array_offset++]; - outptr = output_array[output_array_offset++]; - System.arraycopy(inptr, 0, outptr, 0, count); - } -} - -static boolean jpeg_start_decompress (jpeg_decompress_struct cinfo) { - if (cinfo.global_state == DSTATE_READY) { - /* First call: initialize master control, select active modules */ - jinit_master_decompress(cinfo); - if (cinfo.buffered_image) { - /* No more work here; expecting jpeg_start_output next */ - cinfo.global_state = DSTATE_BUFIMAGE; - return true; - } - cinfo.global_state = DSTATE_PRELOAD; - } - if (cinfo.global_state == DSTATE_PRELOAD) { - /* If file has multiple scans, absorb them all into the coef buffer */ - if (cinfo.inputctl.has_multiple_scans) { -//#ifdef D_MULTISCAN_FILES_SUPPORTED - for (;;) { - int retcode; - /* Call progress monitor hook if present */ -// if (cinfo.progress != null) -// (*cinfo.progress.progress_monitor) ((j_common_ptr) cinfo); - /* Absorb some more input */ - retcode = consume_input (cinfo); - if (retcode == JPEG_SUSPENDED) - return false; - if (retcode == JPEG_REACHED_EOI) - break; - /* Advance progress counter if appropriate */ -// if (cinfo.progress != null && (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { -// if (++cinfo.progress.pass_counter >= cinfo.progress.pass_limit) { -// /* jdmaster underestimated number of scans; ratchet up one scan */ -// cinfo.progress.pass_limit += (long) cinfo.total_iMCU_rows; -// } -// } - } -//#else -// ERREXIT(cinfo, JERR_NOT_COMPILED); -//#endif /* D_MULTISCAN_FILES_SUPPORTED */ - } - cinfo.output_scan_number = cinfo.input_scan_number; - } else if (cinfo.global_state != DSTATE_PRESCAN) - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - /* Perform any dummy output passes, and set up for the final pass */ - return output_pass_setup(cinfo); -} - -static void prepare_for_output_pass (jpeg_decompress_struct cinfo) { - jpeg_decomp_master master = cinfo.master; - - if (master.is_dummy_pass) { -//#ifdef QUANT_2PASS_SUPPORTED -// /* Final pass of 2-pass quantization */ -// master.pub.is_dummy_pass = FALSE; -// (*cinfo.cquantize.start_pass) (cinfo, FALSE); -// (*cinfo.post.start_pass) (cinfo, JBUF_CRANK_DEST); -// (*cinfo.main.start_pass) (cinfo, JBUF_CRANK_DEST); -//#else - error(SWT.ERROR_NOT_IMPLEMENTED); -// ERREXIT(cinfo, JERR_NOT_COMPILED); -//#endif /* QUANT_2PASS_SUPPORTED */ - } else { - if (cinfo.quantize_colors && cinfo.colormap == null) { - /* Select new quantization method */ - if (cinfo.two_pass_quantize && cinfo.enable_2pass_quant) { - cinfo.cquantize = master.quantizer_2pass; - master.is_dummy_pass = true; - } else if (cinfo.enable_1pass_quant) { - cinfo.cquantize = master.quantizer_1pass; - } else { - error(); -// ERREXIT(cinfo, JERR_MODE_CHANGE); - } - } - cinfo.idct.start_pass (cinfo); - start_output_pass (cinfo); - if (! cinfo.raw_data_out) { - if (! master.using_merged_upsample) - cinfo.cconvert.start_pass (cinfo); - cinfo.upsample.start_pass (cinfo); - if (cinfo.quantize_colors) - cinfo.cquantize.start_pass (cinfo, master.is_dummy_pass); - cinfo.post.start_pass (cinfo, (master.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU)); - cinfo.main.start_pass (cinfo, JBUF_PASS_THRU); - } - } - -// /* Set up progress monitor's pass info if present */ -// if (cinfo.progress != NULL) { -// cinfo.progress.completed_passes = master.pass_number; -// cinfo.progress.total_passes = master.pass_number + -// (master.pub.is_dummy_pass ? 2 : 1); -// /* In buffered-image mode, we assume one more output pass if EOI not -// * yet reached, but no more passes if EOI has been reached. -// */ -// if (cinfo.buffered_image && ! cinfo.inputctl.eoi_reached) { -// cinfo.progress.total_passes += (cinfo.enable_2pass_quant ? 2 : 1); -// } -// } -} - - -static boolean jpeg_resync_to_restart (jpeg_decompress_struct cinfo, int desired) { - int marker = cinfo.unread_marker; - int action = 1; - - /* Always put up a warning. */ -// WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired); - - /* Outer loop handles repeated decision after scanning forward. */ - for (;;) { - if (marker < M_SOF0) - action = 2; /* invalid marker */ - else if (marker < M_RST0 || marker > M_RST7) - action = 3; /* valid non-restart marker */ - else { - if (marker == (M_RST0 + ((desired+1) & 7)) || marker == ( M_RST0 + ((desired+2) & 7))) - action = 3; /* one of the next two expected restarts */ - else if (marker == (M_RST0 + ((desired-1) & 7)) || marker == ( M_RST0 + ((desired-2) & 7))) - action = 2; /* a prior restart, so advance */ - else - action = 1; /* desired restart or too far away */ - } -// TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action); - switch (action) { - case 1: - /* Discard marker and let entropy decoder resume processing. */ - cinfo.unread_marker = 0; - return true; - case 2: - /* Scan to the next marker, and repeat the decision loop. */ - if (! next_marker(cinfo)) - return false; - marker = cinfo.unread_marker; - break; - case 3: - /* Return without advancing past this marker. */ - /* Entropy decoder will be forced to process an empty segment. */ - return true; - } - } /* end loop */ -} - -static boolean read_restart_marker (jpeg_decompress_struct cinfo) { - /* Obtain a marker unless we already did. */ - /* Note that next_marker will complain if it skips any data. */ - if (cinfo.unread_marker == 0) { - if (! next_marker(cinfo)) - return false; - } - - if (cinfo.unread_marker == (M_RST0 + cinfo.marker.next_restart_num)) { - /* Normal case --- swallow the marker and let entropy decoder continue */ -// TRACEMS1(cinfo, 3, JTRC_RST, cinfo.marker.next_restart_num); - cinfo.unread_marker = 0; - } else { - /* Uh-oh, the restart markers have been messed up. */ - /* Let the data source manager determine how to resync. */ - if (! jpeg_resync_to_restart (cinfo, cinfo.marker.next_restart_num)) - return false; - } - - /* Update next-restart state */ - cinfo.marker.next_restart_num = (cinfo.marker.next_restart_num + 1) & 7; - - return true; -} - -static boolean jpeg_fill_bit_buffer (bitread_working_state state, int get_buffer, int bits_left, int nbits) -/* Load up the bit buffer to a depth of at least nbits */ -{ - /* Copy heavily used state fields into locals (hopefully registers) */ - byte[] buffer = state.buffer; - int bytes_in_buffer = state.bytes_in_buffer; - int bytes_offset = state.bytes_offset; - jpeg_decompress_struct cinfo = state.cinfo; - - /* Attempt to load at least MIN_GET_BITS bits into get_buffer. */ - /* (It is assumed that no request will be for more than that many bits.) */ - /* We fail to do so only if we hit a marker or are forced to suspend. */ - - if (cinfo.unread_marker == 0) { /* cannot advance past a marker */ - while (bits_left < MIN_GET_BITS) { - int c; - - /* Attempt to read a byte */ - if (bytes_offset == bytes_in_buffer) { - if (! fill_input_buffer (cinfo)) - return false; - buffer = cinfo.buffer; - bytes_in_buffer = cinfo.bytes_in_buffer; - bytes_offset = cinfo.bytes_offset; - } - c = buffer[bytes_offset++] & 0xFF; - - /* If it's 0xFF, check and discard stuffed zero byte */ - if (c == 0xFF) { - /* Loop here to discard any padding FF's on terminating marker, - * so that we can save a valid unread_marker value. NOTE: we will - * accept multiple FF's followed by a 0 as meaning a single FF data - * byte. This data pattern is not valid according to the standard. - */ - do { - if (bytes_offset == bytes_in_buffer) { - if (! fill_input_buffer (cinfo)) - return false; - buffer = cinfo.buffer; - bytes_in_buffer = cinfo.bytes_in_buffer; - bytes_offset = cinfo.bytes_offset; - } - c = buffer[bytes_offset++] & 0xFF; - } while (c == 0xFF); - - if (c == 0) { - /* Found FF/00, which represents an FF data byte */ - c = 0xFF; - } else { - /* Oops, it's actually a marker indicating end of compressed data. - * Save the marker code for later use. - * Fine point: it might appear that we should save the marker into - * bitread working state, not straight into permanent state. But - * once we have hit a marker, we cannot need to suspend within the - * current MCU, because we will read no more bytes from the data - * source. So it is OK to update permanent state right away. - */ - cinfo.unread_marker = c; - /* See if we need to insert some fake zero bits. */ -// goto no_more_bytes; - if (nbits > bits_left) { - /* Uh-oh. Report corrupted data to user and stuff zeroes into - * the data stream, so that we can produce some kind of image. - * We use a nonvolatile flag to ensure that only one warning message - * appears per data segment. - */ - if (! cinfo.entropy.insufficient_data) { -// WARNMS(cinfo, JWRN_HIT_MARKER); - cinfo.entropy.insufficient_data = true; - } - /* Fill the buffer with zero bits */ - get_buffer <<= MIN_GET_BITS - bits_left; - bits_left = MIN_GET_BITS; - } - - /* Unload the local registers */ - state.buffer = buffer; - state.bytes_in_buffer = bytes_in_buffer; - state.bytes_offset = bytes_offset; - state.get_buffer = get_buffer; - state.bits_left = bits_left; - - return true; - - } - } - - /* OK, load c into get_buffer */ - get_buffer = (get_buffer << 8) | c; - bits_left += 8; - } /* end while */ - } else { -// no_more_bytes: - /* We get here if we've read the marker that terminates the compressed - * data segment. There should be enough bits in the buffer register - * to satisfy the request; if so, no problem. - */ - if (nbits > bits_left) { - /* Uh-oh. Report corrupted data to user and stuff zeroes into - * the data stream, so that we can produce some kind of image. - * We use a nonvolatile flag to ensure that only one warning message - * appears per data segment. - */ - if (! cinfo.entropy.insufficient_data) { -// WARNMS(cinfo, JWRN_HIT_MARKER); - cinfo.entropy.insufficient_data = true; - } - /* Fill the buffer with zero bits */ - get_buffer <<= MIN_GET_BITS - bits_left; - bits_left = MIN_GET_BITS; - } - } - - /* Unload the local registers */ - state.buffer = buffer; - state.bytes_in_buffer = bytes_in_buffer; - state.bytes_offset = bytes_offset; - state.get_buffer = get_buffer; - state.bits_left = bits_left; - - return true; -} - -static int jpeg_huff_decode (bitread_working_state state, int get_buffer, int bits_left, d_derived_tbl htbl, int min_bits) { - int l = min_bits; - int code; - - /* HUFF_DECODE has determined that the code is at least min_bits */ - /* bits long, so fetch that many bits in one swoop. */ - -// CHECK_BIT_BUFFER(*state, l, return -1); - { - if (bits_left < (l)) { - if (! jpeg_fill_bit_buffer(state,get_buffer,bits_left,l)) { - return -1; - } - get_buffer = (state).get_buffer; bits_left = (state).bits_left; - } - } -// code = GET_BITS(l); - code = (( (get_buffer >> (bits_left -= (l)))) & ((1<<(l))-1)); - - /* Collect the rest of the Huffman code one bit at a time. */ - /* This is per Figure F.16 in the JPEG spec. */ - - while (code > htbl.maxcode[l]) { - code <<= 1; -// CHECK_BIT_BUFFER(*state, 1, return -1); - { - if (bits_left < (1)) { - if (! jpeg_fill_bit_buffer(state,get_buffer,bits_left,1)) { - return -1; - } - get_buffer = (state).get_buffer; bits_left = (state).bits_left; - } - } -// code |= GET_BITS(1); - code |= (( (get_buffer >> (bits_left -= (1)))) & ((1<<(1))-1)); - l++; - } - - /* Unload the local registers */ - state.get_buffer = get_buffer; - state.bits_left = bits_left; - - /* With garbage input we may reach the sentinel value l = 17. */ - - if (l > 16) { -// WARNMS(state.cinfo, JWRN_HUFF_BAD_CODE); - return 0; /* fake a zero as the safest result */ - } - - return htbl.pub.huffval[ (code + htbl.valoffset[l]) ] & 0xFF; -} - -static int decompress_onepass (jpeg_decompress_struct cinfo, byte[][][] output_buf, int[] output_buf_offset) { - jpeg_d_coef_controller coef = cinfo.coef; - int MCU_col_num; /* index of current MCU within row */ - int last_MCU_col = cinfo.MCUs_per_row - 1; - int last_iMCU_row = cinfo.total_iMCU_rows - 1; - int blkn, ci, xindex, yindex, yoffset, useful_width; - byte[][] output_ptr; - int start_col, output_col; - jpeg_component_info compptr; -// inverse_DCT_method_ptr inverse_DCT; - - /* Loop to process as much as one whole iMCU row */ - for (yoffset = coef.MCU_vert_offset; yoffset < coef.MCU_rows_per_iMCU_row; yoffset++) { - for (MCU_col_num = coef.MCU_ctr; MCU_col_num <= last_MCU_col; MCU_col_num++) { - /* Try to fetch an MCU. Entropy decoder expects buffer to be zeroed. */ - for (int i = 0; i < cinfo.blocks_in_MCU; i++) { - short[] blk = coef.MCU_buffer[i]; - for (int j = 0; j < blk.length; j++) { - blk[j] = 0; - } - } - if (! cinfo.entropy.decode_mcu (cinfo, coef.MCU_buffer)) { - /* Suspension forced; update state counters and exit */ - coef.MCU_vert_offset = yoffset; - coef.MCU_ctr = MCU_col_num; - return JPEG_SUSPENDED; - } - /* Determine where data should go in output_buf and do the IDCT thing. - * We skip dummy blocks at the right and bottom edges (but blkn gets - * incremented past them!). Note the inner loop relies on having - * allocated the MCU_buffer[] blocks sequentially. - */ - blkn = 0; /* index of current DCT block within MCU */ - for (ci = 0; ci < cinfo.comps_in_scan; ci++) { - compptr = cinfo.cur_comp_info[ci]; - /* Don't bother to IDCT an uninteresting component. */ - if (! compptr.component_needed) { - blkn += compptr.MCU_blocks; - continue; - } -// inverse_DCT = cinfo.idct.inverse_DCT[compptr.component_index]; - useful_width = (MCU_col_num < last_MCU_col) ? compptr.MCU_width : compptr.last_col_width; - output_ptr = output_buf[compptr.component_index]; - int output_ptr_offset = output_buf_offset[compptr.component_index] + yoffset * compptr.DCT_scaled_size; - start_col = MCU_col_num * compptr.MCU_sample_width; - for (yindex = 0; yindex < compptr.MCU_height; yindex++) { - if (cinfo.input_iMCU_row < last_iMCU_row || yoffset+yindex < compptr.last_row_height) { - output_col = start_col; - for (xindex = 0; xindex < useful_width; xindex++) { - jpeg_idct_islow(cinfo, compptr, coef.MCU_buffer[blkn+xindex], output_ptr, output_ptr_offset, output_col); - output_col += compptr.DCT_scaled_size; - } - } - blkn += compptr.MCU_width; - output_ptr_offset += compptr.DCT_scaled_size; - } - } - } - /* Completed an MCU row, but perhaps not an iMCU row */ - coef.MCU_ctr = 0; - } - /* Completed the iMCU row, advance counters for next one */ - cinfo.output_iMCU_row++; - if (++(cinfo.input_iMCU_row) < cinfo.total_iMCU_rows) { - coef.start_iMCU_row(cinfo); - return JPEG_ROW_COMPLETED; - } - /* Completed the scan */ - finish_input_pass (cinfo); - return JPEG_SCAN_COMPLETED; -} - -static int decompress_smooth_data (jpeg_decompress_struct cinfo, byte[][][] output_buf, int[] output_buf_offset) { - jpeg_d_coef_controller coef = cinfo.coef; - int last_iMCU_row = cinfo.total_iMCU_rows - 1; - int block_num, last_block_column; - int ci, block_row, block_rows, access_rows; - short[][][] buffer; - short[][] buffer_ptr, prev_block_row, next_block_row; - byte[][] output_ptr; - int output_col; - jpeg_component_info compptr; -// inverse_DCT_method_ptr inverse_DCT; - boolean first_row, last_row; - short[] workspace = coef.workspace; - if (workspace == null) workspace = coef.workspace = new short[DCTSIZE2]; - int[] coef_bits; - JQUANT_TBL quanttbl; - int Q00,Q01,Q02,Q10,Q11,Q20, num; - int DC1,DC2,DC3,DC4,DC5,DC6,DC7,DC8,DC9; - int Al, pred; - - /* Force some input to be done if we are getting ahead of the input. */ - while (cinfo.input_scan_number <= cinfo.output_scan_number && ! cinfo.inputctl.eoi_reached) { - if (cinfo.input_scan_number == cinfo.output_scan_number) { - /* If input is working on current scan, we ordinarily want it to - * have completed the current row. But if input scan is DC, - * we want it to keep one row ahead so that next block row's DC - * values are up to date. - */ - int delta = (cinfo.Ss == 0) ? 1 : 0; - if (cinfo.input_iMCU_row > cinfo.output_iMCU_row+delta) - break; - } - if (consume_input(cinfo) == JPEG_SUSPENDED) - return JPEG_SUSPENDED; - } - - /* OK, output from the virtual arrays. */ - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* Don't bother to IDCT an uninteresting component. */ - if (! compptr.component_needed) - continue; - /* Count non-dummy DCT block rows in this iMCU row. */ - if (cinfo.output_iMCU_row < last_iMCU_row) { - block_rows = compptr.v_samp_factor; - access_rows = block_rows * 2; /* this and next iMCU row */ - last_row = false; - } else { - /* NB: can't use last_row_height here; it is input-side-dependent! */ - block_rows = (compptr.height_in_blocks % compptr.v_samp_factor); - if (block_rows == 0) block_rows = compptr.v_samp_factor; - access_rows = block_rows; /* this iMCU row only */ - last_row = true; - } - /* Align the virtual buffer for this component. */ - int buffer_offset; - if (cinfo.output_iMCU_row > 0) { - access_rows += compptr.v_samp_factor; /* prior iMCU row too */ - buffer = coef.whole_image[ci]; - buffer_offset = (cinfo.output_iMCU_row - 1) * compptr.v_samp_factor; - buffer_offset += compptr.v_samp_factor; /* point to current iMCU row */ - first_row = false; - } else { - buffer = coef.whole_image[ci]; - buffer_offset = 0; - first_row = true; - } - /* Fetch component-dependent info */ - coef_bits = coef.coef_bits_latch; - int coef_offset = (ci * SAVED_COEFS); - quanttbl = compptr.quant_table; - Q00 = quanttbl.quantval[0]; - Q01 = quanttbl.quantval[Q01_POS]; - Q10 = quanttbl.quantval[Q10_POS]; - Q20 = quanttbl.quantval[Q20_POS]; - Q11 = quanttbl.quantval[Q11_POS]; - Q02 = quanttbl.quantval[Q02_POS]; -// inverse_DCT = cinfo.idct.inverse_DCT[ci]; - output_ptr = output_buf[ci]; - int output_ptr_offset = output_buf_offset[ci]; - /* Loop over all DCT blocks to be processed. */ - for (block_row = 0; block_row < block_rows; block_row++) { - buffer_ptr = buffer[block_row+buffer_offset]; - int buffer_ptr_offset = 0, prev_block_row_offset = 0, next_block_row_offset = 0; - if (first_row && block_row == 0) { - prev_block_row = buffer_ptr; - prev_block_row_offset = buffer_ptr_offset; - } else { - prev_block_row = buffer[block_row-1+buffer_offset]; - prev_block_row_offset = 0; - } - if (last_row && block_row == block_rows-1) { - next_block_row = buffer_ptr; - next_block_row_offset = buffer_ptr_offset; - } else { - next_block_row = buffer[block_row+1+buffer_offset]; - next_block_row_offset = 0; - } - /* We fetch the surrounding DC values using a sliding-register approach. - * Initialize all nine here so as to do the right thing on narrow pics. - */ - DC1 = DC2 = DC3 = prev_block_row[0+prev_block_row_offset][0]; - DC4 = DC5 = DC6 = buffer_ptr[0+buffer_ptr_offset][0]; - DC7 = DC8 = DC9 = next_block_row[0+next_block_row_offset][0]; - output_col = 0; - last_block_column = compptr.width_in_blocks - 1; - for (block_num = 0; block_num <= last_block_column; block_num++) { - /* Fetch current DCT block into workspace so we can modify it. */ -// jcopy_block_row(buffer_ptr, workspace, 1); - System.arraycopy(buffer_ptr[buffer_ptr_offset], 0, workspace, 0, workspace.length); - /* Update DC values */ - if (block_num < last_block_column) { - DC3 = prev_block_row[1+prev_block_row_offset][0]; - DC6 = buffer_ptr[1+buffer_ptr_offset][0]; - DC9 = next_block_row[1+next_block_row_offset][0]; - } - /* Compute coefficient estimates per K.8. - * An estimate is applied only if coefficient is still zero, - * and is not known to be fully accurate. - */ - /* AC01 */ - if ((Al=coef_bits[1+coef_offset]) != 0 && workspace[1] == 0) { - num = 36 * Q00 * (DC4 - DC6); - if (num >= 0) { - pred = (((Q01<<7) + num) / (Q01<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - } else { - pred = (((Q01<<7) - num) / (Q01<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - pred = -pred; - } - workspace[1] = (short) pred; - } - /* AC10 */ - if ((Al=coef_bits[2+coef_offset]) != 0 && workspace[8] == 0) { - num = 36 * Q00 * (DC2 - DC8); - if (num >= 0) { - pred = (((Q10<<7) + num) / (Q10<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - } else { - pred = (((Q10<<7) - num) / (Q10<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - pred = -pred; - } - workspace[8] = (short) pred; - } - /* AC20 */ - if ((Al=coef_bits[3+coef_offset]) != 0 && workspace[16] == 0) { - num = 9 * Q00 * (DC2 + DC8 - 2*DC5); - if (num >= 0) { - pred = (((Q20<<7) + num) / (Q20<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - } else { - pred = (((Q20<<7) - num) / (Q20<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - pred = -pred; - } - workspace[16] = (short) pred; - } - /* AC11 */ - if ((Al=coef_bits[4+coef_offset]) != 0 && workspace[9] == 0) { - num = 5 * Q00 * (DC1 - DC3 - DC7 + DC9); - if (num >= 0) { - pred = (((Q11<<7) + num) / (Q11<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - } else { - pred = (((Q11<<7) - num) / (Q11<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - pred = -pred; - } - workspace[9] = (short) pred; - } - /* AC02 */ - if ((Al=coef_bits[5+coef_offset]) != 0 && workspace[2] == 0) { - num = 9 * Q00 * (DC4 + DC6 - 2*DC5); - if (num >= 0) { - pred = (((Q02<<7) + num) / (Q02<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - } else { - pred = (((Q02<<7) - num) / (Q02<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; - pred = -pred; - } - workspace[2] = (short) pred; - } - /* OK, do the IDCT */ - jpeg_idct_islow(cinfo, compptr, workspace, output_ptr, output_ptr_offset, output_col); - /* Advance for next column */ - DC1 = DC2; DC2 = DC3; - DC4 = DC5; DC5 = DC6; - DC7 = DC8; DC8 = DC9; - buffer_ptr_offset++; prev_block_row_offset++; next_block_row_offset++; - output_col += compptr.DCT_scaled_size; - } - output_ptr_offset += compptr.DCT_scaled_size; - } - } - - if (++(cinfo.output_iMCU_row) < cinfo.total_iMCU_rows) - return JPEG_ROW_COMPLETED; - return JPEG_SCAN_COMPLETED; -} - -static int decompress_data (jpeg_decompress_struct cinfo, byte[][][] output_buf, int[] output_buf_offset) { - jpeg_d_coef_controller coef = cinfo.coef; - int last_iMCU_row = cinfo.total_iMCU_rows - 1; - int block_num; - int ci, block_row, block_rows; - short[][][] buffer; - short[][] buffer_ptr; - byte[][] output_ptr; - int output_col; - jpeg_component_info compptr; -// inverse_DCT_method_ptr inverse_DCT; - - /* Force some input to be done if we are getting ahead of the input. */ - while (cinfo.input_scan_number < cinfo.output_scan_number || - (cinfo.input_scan_number == cinfo.output_scan_number && - cinfo.input_iMCU_row <= cinfo.output_iMCU_row)) - { - if (consume_input(cinfo) == JPEG_SUSPENDED) - return JPEG_SUSPENDED; - } - - /* OK, output from the virtual arrays. */ - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* Don't bother to IDCT an uninteresting component. */ - if (! compptr.component_needed) - continue; - /* Align the virtual buffer for this component. */ - buffer = coef.whole_image[ci]; - int buffer_offset = cinfo.output_iMCU_row * compptr.v_samp_factor; - /* Count non-dummy DCT block rows in this iMCU row. */ - if (cinfo.output_iMCU_row < last_iMCU_row) - block_rows = compptr.v_samp_factor; - else { - /* NB: can't use last_row_height here; it is input-side-dependent! */ - block_rows = (compptr.height_in_blocks % compptr.v_samp_factor); - if (block_rows == 0) block_rows = compptr.v_samp_factor; - } -// inverse_DCT = cinfo.idct.inverse_DCT[ci]; - output_ptr = output_buf[ci]; - int output_ptr_offset = output_buf_offset[ci]; - /* Loop over all DCT blocks to be processed. */ - for (block_row = 0; block_row < block_rows; block_row++) { - buffer_ptr = buffer[block_row+buffer_offset]; - int buffer_ptr_offset = 0; - output_col = 0; - for (block_num = 0; block_num < compptr.width_in_blocks; block_num++) { - jpeg_idct_islow(cinfo, compptr, buffer_ptr[buffer_ptr_offset], output_ptr, output_ptr_offset, output_col); - - buffer_ptr_offset++; - output_col += compptr.DCT_scaled_size; - } - output_ptr_offset += compptr.DCT_scaled_size; - } - } - - if (++(cinfo.output_iMCU_row) < cinfo.total_iMCU_rows) - return JPEG_ROW_COMPLETED; - return JPEG_SCAN_COMPLETED; -} - -static void post_process_data (jpeg_decompress_struct cinfo, - byte[][][] input_buf, int[] input_buf_offset, int[] in_row_group_ctr, - int in_row_groups_avail, - byte[][] output_buf, int[] out_row_ctr, - int out_rows_avail) -{ - upsample(cinfo, input_buf, input_buf_offset, in_row_group_ctr, in_row_groups_avail, output_buf, out_row_ctr, out_rows_avail); -} - -static void set_bottom_pointers (jpeg_decompress_struct cinfo) -/* Change the pointer lists to duplicate the last sample row at the bottom - * of the image. whichptr indicates which xbuffer holds the final iMCU row. - * Also sets rowgroups_avail to indicate number of nondummy row groups in row. - */ -{ - jpeg_d_main_controller main = cinfo.main; - int ci, i, rgroup, iMCUheight, rows_left; - jpeg_component_info compptr; - byte[][] xbuf; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* Count sample rows in one iMCU row and in one row group */ - iMCUheight = compptr.v_samp_factor * compptr.DCT_scaled_size; - rgroup = iMCUheight / cinfo.min_DCT_scaled_size; - /* Count nondummy sample rows remaining for this component */ - rows_left = (compptr.downsampled_height % iMCUheight); - if (rows_left == 0) rows_left = iMCUheight; - /* Count nondummy row groups. Should get same answer for each component, - * so we need only do it once. - */ - if (ci == 0) { - main.rowgroups_avail = ((rows_left-1) / rgroup + 1); - } - /* Duplicate the last real sample row rgroup*2 times; this pads out the - * last partial rowgroup and ensures at least one full rowgroup of context. - */ - xbuf = main.xbuffer[main.whichptr][ci]; - int xbuf_offset = main.xbuffer_offset[main.whichptr][ci]; - for (i = 0; i < rgroup * 2; i++) { - xbuf[rows_left + i + xbuf_offset] = xbuf[rows_left-1 + xbuf_offset]; - } - } -} - -static void set_wraparound_pointers (jpeg_decompress_struct cinfo) -/* Set up the "wraparound" pointers at top and bottom of the pointer lists. - * This changes the pointer list state from top-of-image to the normal state. - */ -{ - jpeg_d_main_controller main = cinfo.main; - int ci, i, rgroup; - int M = cinfo.min_DCT_scaled_size; - jpeg_component_info compptr; - byte[][] xbuf0, xbuf1; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - rgroup = (compptr.v_samp_factor * compptr.DCT_scaled_size) / cinfo.min_DCT_scaled_size; /* height of a row group of component */ - xbuf0 = main.xbuffer[0][ci]; - int xbuf0_offset = main.xbuffer_offset[0][ci]; - xbuf1 = main.xbuffer[1][ci]; - int xbuf1_offset = main.xbuffer_offset[1][ci]; - for (i = 0; i < rgroup; i++) { - xbuf0[i - rgroup + xbuf0_offset] = xbuf0[rgroup*(M+1) + i + xbuf0_offset]; - xbuf1[i - rgroup + xbuf1_offset] = xbuf1[rgroup*(M+1) + i + xbuf1_offset]; - xbuf0[rgroup*(M+2) + i + xbuf0_offset] = xbuf0[i + xbuf0_offset]; - xbuf1[rgroup*(M+2) + i + xbuf1_offset] = xbuf1[i + xbuf1_offset]; - } - } -} - -static void process_data_crank_post (jpeg_decompress_struct cinfo, - byte[][] output_buf, int[] out_row_ctr, - int out_rows_avail) -{ - error(); -} - -static void process_data_context_main (jpeg_decompress_struct cinfo, - byte[][] output_buf, int[] out_row_ctr, - int out_rows_avail) -{ - jpeg_d_main_controller main = cinfo.main; - - /* Read input data if we haven't filled the main buffer yet */ - if (! main.buffer_full) { - int result; - switch (cinfo.coef.decompress_data) { - case DECOMPRESS_DATA: - result = decompress_data(cinfo, main.xbuffer[main.whichptr], main.xbuffer_offset[main.whichptr]); - break; - case DECOMPRESS_SMOOTH_DATA: - result = decompress_smooth_data(cinfo, main.xbuffer[main.whichptr], main.xbuffer_offset[main.whichptr]); - break; - case DECOMPRESS_ONEPASS: - result = decompress_onepass(cinfo, main.xbuffer[main.whichptr], main.xbuffer_offset[main.whichptr]); - break; - default: result = 0; - } - if (result == 0) - return; /* suspension forced, can do nothing more */ - main.buffer_full = true; /* OK, we have an iMCU row to work with */ - main.iMCU_row_ctr++; /* count rows received */ - } - - /* Postprocessor typically will not swallow all the input data it is handed - * in one call (due to filling the output buffer first). Must be prepared - * to exit and restart. This switch lets us keep track of how far we got. - * Note that each case falls through to the next on successful completion. - */ - switch (main.context_state) { - case CTX_POSTPONED_ROW: - /* Call postprocessor using previously set pointers for postponed row */ - post_process_data (cinfo, main.xbuffer[main.whichptr], main.xbuffer_offset[main.whichptr], main.rowgroup_ctr, main.rowgroups_avail, output_buf, out_row_ctr, out_rows_avail); - if (main.rowgroup_ctr[0] < main.rowgroups_avail) - return; /* Need to suspend */ - main.context_state = CTX_PREPARE_FOR_IMCU; - if (out_row_ctr[0] >= out_rows_avail) - return; /* Postprocessor exactly filled output buf */ - /*FALLTHROUGH*/ - case CTX_PREPARE_FOR_IMCU: - /* Prepare to process first M-1 row groups of this iMCU row */ - main.rowgroup_ctr[0] = 0; - main.rowgroups_avail = (cinfo.min_DCT_scaled_size - 1); - /* Check for bottom of image: if so, tweak pointers to "duplicate" - * the last sample row, and adjust rowgroups_avail to ignore padding rows. - */ - if (main.iMCU_row_ctr == cinfo.total_iMCU_rows) - set_bottom_pointers(cinfo); - main.context_state = CTX_PROCESS_IMCU; - /*FALLTHROUGH*/ - case CTX_PROCESS_IMCU: - /* Call postprocessor using previously set pointers */ - post_process_data (cinfo, main.xbuffer[main.whichptr], main.xbuffer_offset[main.whichptr], main.rowgroup_ctr, main.rowgroups_avail, output_buf, out_row_ctr, out_rows_avail); - if (main.rowgroup_ctr[0] < main.rowgroups_avail) - return; /* Need to suspend */ - /* After the first iMCU, change wraparound pointers to normal state */ - if (main.iMCU_row_ctr == 1) - set_wraparound_pointers(cinfo); - /* Prepare to load new iMCU row using other xbuffer list */ - main.whichptr ^= 1; /* 0=>1 or 1=>0 */ - main.buffer_full = false; - /* Still need to process last row group of this iMCU row, */ - /* which is saved at index M+1 of the other xbuffer */ - main.rowgroup_ctr[0] = (cinfo.min_DCT_scaled_size + 1); - main.rowgroups_avail = (cinfo.min_DCT_scaled_size + 2); - main.context_state = CTX_POSTPONED_ROW; - } -} - -static void process_data_simple_main (jpeg_decompress_struct cinfo, byte[][] output_buf, int[] out_row_ctr, int out_rows_avail) { - jpeg_d_main_controller main = cinfo.main; - int rowgroups_avail; - - /* Read input data if we haven't filled the main buffer yet */ - if (! main.buffer_full) { - int result; - switch (cinfo.coef.decompress_data) { - case DECOMPRESS_DATA: - result = decompress_data(cinfo, main.buffer, main.buffer_offset); - break; - case DECOMPRESS_SMOOTH_DATA: - result = decompress_smooth_data(cinfo, main.buffer, main.buffer_offset); - break; - case DECOMPRESS_ONEPASS: - result = decompress_onepass(cinfo, main.buffer, main.buffer_offset); - break; - default: result = 0; - } - if (result == 0) - return; /* suspension forced, can do nothing more */ - main.buffer_full = true; /* OK, we have an iMCU row to work with */ - } - - /* There are always min_DCT_scaled_size row groups in an iMCU row. */ - rowgroups_avail = cinfo.min_DCT_scaled_size; - /* Note: at the bottom of the image, we may pass extra garbage row groups - * to the postprocessor. The postprocessor has to check for bottom - * of image anyway (at row resolution), so no point in us doing it too. - */ - - /* Feed the postprocessor */ - post_process_data (cinfo, main.buffer, main.buffer_offset, main.rowgroup_ctr, rowgroups_avail, output_buf, out_row_ctr, out_rows_avail); - - /* Has postprocessor consumed all the data yet? If so, mark buffer empty */ - if (main.rowgroup_ctr[0] >= rowgroups_avail) { - main.buffer_full = false; - main.rowgroup_ctr[0] = 0; - } -} - -static int jpeg_read_scanlines (jpeg_decompress_struct cinfo, byte[][] scanlines, int max_lines) { - - if (cinfo.global_state != DSTATE_SCANNING) - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - if (cinfo.output_scanline >= cinfo.output_height) { -// WARNMS(cinfo, JWRN_TOO_MUCH_DATA); - return 0; - } - - /* Call progress monitor hook if present */ -// if (cinfo.progress != NULL) { -// cinfo.progress.pass_counter = (long) cinfo.output_scanline; -// cinfo.progress.pass_limit = (long) cinfo.output_height; -// (*cinfo.progress.progress_monitor) ((j_common_ptr) cinfo); -// } - - /* Process some data */ - cinfo.row_ctr[0] = 0; - switch (cinfo.main.process_data) { - case PROCESS_DATA_SIMPLE_MAIN: - process_data_simple_main (cinfo, scanlines, cinfo.row_ctr, max_lines); - break; - case PROCESS_DATA_CONTEXT_MAIN: - process_data_context_main (cinfo, scanlines, cinfo.row_ctr, max_lines); - break; - case PROCESS_DATA_CRANK_POST: - process_data_crank_post (cinfo, scanlines, cinfo.row_ctr, max_lines); - break; - default: error(); - } - cinfo.output_scanline += cinfo.row_ctr[0]; - return cinfo.row_ctr[0]; -} - - -static boolean output_pass_setup (jpeg_decompress_struct cinfo) { - if (cinfo.global_state != DSTATE_PRESCAN) { - /* First call: do pass setup */ - prepare_for_output_pass (cinfo); - cinfo.output_scanline = 0; - cinfo.global_state = DSTATE_PRESCAN; - } - /* Loop over any required dummy passes */ - while (cinfo.master.is_dummy_pass) { - error(); -//#ifdef QUANT_2PASS_SUPPORTED -// /* Crank through the dummy pass */ -// while (cinfo.output_scanline < cinfo.output_height) { -// JDIMENSION last_scanline; -// /* Call progress monitor hook if present */ -// if (cinfo.progress != NULL) { -// cinfo.progress.pass_counter = (long) cinfo.output_scanline; -// cinfo.progress.pass_limit = (long) cinfo.output_height; -// (*cinfo.progress.progress_monitor) ((j_common_ptr) cinfo); -// } -// /* Process some data */ -// last_scanline = cinfo.output_scanline; -// (*cinfo.main.process_data) (cinfo, (JSAMPARRAY) NULL, -// &cinfo.output_scanline, (JDIMENSION) 0); -// if (cinfo.output_scanline == last_scanline) -// return FALSE; /* No progress made, must suspend */ -// } -// /* Finish up dummy pass, and set up for another one */ -// (*cinfo.master.finish_output_pass) (cinfo); -// (*cinfo.master.prepare_for_output_pass) (cinfo); -// cinfo.output_scanline = 0; -//#else -// ERREXIT(cinfo, JERR_NOT_COMPILED); -//#endif /* QUANT_2PASS_SUPPORTED */ - } - /* Ready for application to drive output pass through - * jpeg_read_scanlines or jpeg_read_raw_data. - */ - cinfo.global_state = cinfo.raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING; - return true; -} - -static boolean get_dht (jpeg_decompress_struct cinfo) -/* Process a DHT marker */ -{ - int length; - byte[] bits = new byte[17]; - byte[] huffval = new byte[256]; - int i, index, count; - JHUFF_TBL htblptr; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - length -= 2; - - while (length > 16) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - index = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - -// TRACEMS1(cinfo, 1, JTRC_DHT, index); - - bits[0] = 0; - count = 0; - for (i = 1; i <= 16; i++) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - bits[i] = cinfo.buffer[cinfo.bytes_offset++]; - count += bits[i] & 0xFF; - } - - length -= 1 + 16; - -// TRACEMS8(cinfo, 2, JTRC_HUFFBITS, -// bits[1], bits[2], bits[3], bits[4], -// bits[5], bits[6], bits[7], bits[8]); -// TRACEMS8(cinfo, 2, JTRC_HUFFBITS, -// bits[9], bits[10], bits[11], bits[12], -// bits[13], bits[14], bits[15], bits[16]); - - /* Here we just do minimal validation of the counts to avoid walking - * off the end of our table space. jdhuff.c will check more carefully. - */ - if (count > 256 || (count) > length) - error(); -// ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); - - for (i = 0; i < count; i++) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - huffval[i] = cinfo.buffer[cinfo.bytes_offset++]; - } - - length -= count; - - if ((index & 0x10) != 0) { /* AC table definition */ - index -= 0x10; - htblptr = cinfo.ac_huff_tbl_ptrs[index] = new JHUFF_TBL(); - } else { /* DC table definition */ - htblptr = cinfo.dc_huff_tbl_ptrs[index] = new JHUFF_TBL(); - } - - if (index < 0 || index >= NUM_HUFF_TBLS) - error(); -// ERREXIT1(cinfo, JERR_DHT_INDEX, index); - - System.arraycopy(bits, 0, htblptr.bits, 0, bits.length); - System.arraycopy(huffval, 0, htblptr.huffval, 0, huffval.length); - } - - if (length != 0) - error(); -// ERREXIT(cinfo, JERR_BAD_LENGTH); - - return true; -} - - -static boolean get_dqt (jpeg_decompress_struct cinfo) -/* Process a DQT marker */ -{ - int length; - int n, i, prec; - int tmp; - JQUANT_TBL quant_ptr; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - length -= 2; - - while (length > 0) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - n = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - prec = n >> 4; - n &= 0x0F; - -// TRACEMS2(cinfo, 1, JTRC_DQT, n, prec); - - if (n >= NUM_QUANT_TBLS) - error(); -// ERREXIT1(cinfo, JERR_DQT_INDEX, n); - - if (cinfo.quant_tbl_ptrs[n] == null) - cinfo.quant_tbl_ptrs[n] = new JQUANT_TBL(); - quant_ptr = cinfo.quant_tbl_ptrs[n]; - - for (i = 0; i < DCTSIZE2; i++) { - if (prec != 0) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - tmp = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - tmp |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - } else { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - tmp = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - } - /* We convert the zigzag-order table to natural array order. */ - quant_ptr.quantval[jpeg_natural_order[i]] = (short) tmp; - } - -// if (cinfo.err.trace_level >= 2) { -// for (i = 0; i < DCTSIZE2; i += 8) { -// TRACEMS8(cinfo, 2, JTRC_QUANTVALS, -// quant_ptr.quantval[i], quant_ptr.quantval[i+1], -// quant_ptr.quantval[i+2], quant_ptr.quantval[i+3], -// quant_ptr.quantval[i+4], quant_ptr.quantval[i+5], -// quant_ptr.quantval[i+6], quant_ptr.quantval[i+7]); -// } -// } - - length -= (DCTSIZE2+1); - if (prec != 0) length -= DCTSIZE2; - } - - if (length != 0) - error(); -// ERREXIT(cinfo, JERR_BAD_LENGTH); - - return true; -} - -static boolean get_dri (jpeg_decompress_struct cinfo) -/* Process a DRI marker */ -{ - int length; - int tmp; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - if (length != 4) - error(); -// ERREXIT(cinfo, JERR_BAD_LENGTH); - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - tmp = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - tmp |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - -// TRACEMS1(cinfo, 1, JTRC_DRI, tmp); - - cinfo.restart_interval = tmp; - - return true; -} - -static boolean get_dac (jpeg_decompress_struct cinfo) -/* Process a DAC marker */ -{ - int length; - int index, val; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - length -= 2; - - while (length > 0) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - index = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - val = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - length -= 2; - -// TRACEMS2(cinfo, 1, JTRC_DAC, index, val); - - if (index < 0 || index >= (2*NUM_ARITH_TBLS)) - error(); -// ERREXIT1(cinfo, JERR_DAC_INDEX, index); - - if (index >= NUM_ARITH_TBLS) { /* define AC table */ - cinfo.arith_ac_K[index-NUM_ARITH_TBLS] = (byte) val; - } else { /* define DC table */ - cinfo.arith_dc_L[index] = (byte) (val & 0x0F); - cinfo.arith_dc_U[index] = (byte) (val >> 4); - if (cinfo.arith_dc_L[index] > cinfo.arith_dc_U[index]) - error(); -// ERREXIT1(cinfo, JERR_DAC_VALUE, val); - } - } - - if (length != 0) - error(); -// ERREXIT(cinfo, JERR_BAD_LENGTH); - - return true; -} - - -static boolean get_sos (jpeg_decompress_struct cinfo) -/* Process a SOS marker */ -{ - int length; - int i, ci, n, c, cc; - jpeg_component_info compptr = null; - - if (! cinfo.marker.saw_SOF) - error(); -// ERREXIT(cinfo, JERR_SOS_NO_SOF); - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - n = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - -// TRACEMS1(cinfo, 1, JTRC_SOS, n); - - if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN) - error(); -// ERREXIT(cinfo, JERR_BAD_LENGTH); - - cinfo.comps_in_scan = n; - - /* Collect the component-spec parameters */ - - for (i = 0; i < n; i++) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - cc = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - if (cc == compptr.component_id) - break; - } - - if (ci == cinfo.num_components) - error(); -// ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc); - - cinfo.cur_comp_info[i] = compptr; - compptr.dc_tbl_no = (c >> 4) & 15; - compptr.ac_tbl_no = (c ) & 15; - -// TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc, compptr.dc_tbl_no, compptr.ac_tbl_no); - } - - /* Collect the additional scan parameters Ss, Se, Ah/Al. */ - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - cinfo.Ss = c; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - cinfo.Se = c; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - cinfo.Ah = (c >> 4) & 15; - cinfo.Al = (c ) & 15; - -// TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo.Ss, cinfo.Se, cinfo.Ah, cinfo.Al); - - /* Prepare to scan data & restart markers */ - cinfo.marker.next_restart_num = 0; - - /* Count another SOS marker */ - cinfo.input_scan_number++; - - return true; -} - -static boolean get_sof (jpeg_decompress_struct cinfo, boolean is_prog, boolean is_arith) { - int length; - int c, ci; - - cinfo.progressive_mode = is_prog; - cinfo.arith_code = is_arith; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - cinfo.data_precision = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - cinfo.image_height = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - cinfo.image_height |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - cinfo.image_width = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - cinfo.image_width |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - cinfo.num_components = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - length -= 8; - -// TRACEMS4(cinfo, 1, JTRC_SOF, cinfo.unread_marker, -// (int) cinfo.image_width, (int) cinfo.image_height, -// cinfo.num_components); - - if (cinfo.marker.saw_SOF) - error(); -// ERREXIT(cinfo, JERR_SOF_DUPLICATE); - - /* We don't support files in which the image height is initially specified */ - /* as 0 and is later redefined by DNL. As long as we have to check that, */ - /* might as well have a general sanity check. */ - if (cinfo.image_height <= 0 || cinfo.image_width <= 0 || cinfo.num_components <= 0) - error(); -// ERREXIT(cinfo, JERR_EMPTY_IMAGE); - - if (length != (cinfo.num_components * 3)) - error(); -// ERREXIT(cinfo, JERR_BAD_LENGTH); - - if (cinfo.comp_info == null) /* do only once, even if suspend */ - cinfo.comp_info = new jpeg_component_info[cinfo.num_components]; - - for (ci = 0; ci < cinfo.num_components; ci++) { - jpeg_component_info compptr = cinfo.comp_info[ci] = new jpeg_component_info(); - compptr.component_index = ci; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - compptr.component_id = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - compptr.h_samp_factor = (c >> 4) & 15; - compptr.v_samp_factor = (c ) & 15; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - compptr.quant_tbl_no = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - -// TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT, -// compptr.component_id, compptr.h_samp_factor, -// compptr.v_samp_factor, compptr.quant_tbl_no); - } - - cinfo.marker.saw_SOF = true; - - return true; -} - -static void sep_upsample (jpeg_decompress_struct cinfo, byte[][][] input_buf, int[] input_buf_offset, - int[] in_row_group_ctr, int in_row_groups_avail, - byte[][] output_buf, int[] out_row_ctr, int out_rows_avail) -{ - jpeg_upsampler upsample = cinfo.upsample; - int ci; - jpeg_component_info compptr; - int num_rows; - - /* Fill the conversion buffer, if it's empty */ - if (upsample.next_row_out >= cinfo.max_v_samp_factor) { - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - /* Invoke per-component upsample method. Notice we pass a POINTER - * to color_buf[ci], so that fullsize_upsample can change it. - */ - int offset = input_buf_offset[ci] + (in_row_group_ctr[0] * upsample.rowgroup_height[ci]); - switch (upsample.methods[ci]) { - case NOOP_UPSAMPLE: noop_upsample(cinfo, compptr, input_buf[ci], offset, upsample.color_buf, upsample.color_buf_offset, ci); break; - case FULLSIZE_UPSAMPLE: fullsize_upsample(cinfo, compptr, input_buf[ci], offset, upsample.color_buf, upsample.color_buf_offset, ci); break; - case H2V1_FANCY_UPSAMPLE: h2v1_fancy_upsample(cinfo, compptr, input_buf[ci], offset, upsample.color_buf, upsample.color_buf_offset, ci); break; - case H2V1_UPSAMPLE: h2v1_upsample(cinfo, compptr, input_buf[ci], offset, upsample.color_buf, upsample.color_buf_offset, ci); break; - case H2V2_FANCY_UPSAMPLE: h2v2_fancy_upsample(cinfo, compptr, input_buf[ci], offset, upsample.color_buf, upsample.color_buf_offset, ci); break; - case H2V2_UPSAMPLE: h2v2_upsample(cinfo, compptr, input_buf[ci], offset, upsample.color_buf, upsample.color_buf_offset, ci); break; - case INT_UPSAMPLE: int_upsample(cinfo, compptr, input_buf[ci], offset, upsample.color_buf, upsample.color_buf_offset, ci); break; - } - } - upsample.next_row_out = 0; - } - - /* Color-convert and emit rows */ - - /* How many we have in the buffer: */ - num_rows = (cinfo.max_v_samp_factor - upsample.next_row_out); - /* Not more than the distance to the end of the image. Need this test - * in case the image height is not a multiple of max_v_samp_factor: - */ - if (num_rows > upsample.rows_to_go) - num_rows = upsample.rows_to_go; - /* And not more than what the client can accept: */ - out_rows_avail -= out_row_ctr[0]; - if (num_rows > out_rows_avail) - num_rows = out_rows_avail; - - switch (cinfo.cconvert.color_convert) { - case NULL_CONVERT: null_convert (cinfo, upsample.color_buf, upsample.color_buf_offset, upsample.next_row_out, output_buf, out_row_ctr[0], num_rows); break; - case GRAYSCALE_CONVERT: grayscale_convert (cinfo, upsample.color_buf, upsample.color_buf_offset, upsample.next_row_out, output_buf, out_row_ctr[0], num_rows); break; - case YCC_RGB_CONVERT: ycc_rgb_convert (cinfo, upsample.color_buf, upsample.color_buf_offset, upsample.next_row_out, output_buf, out_row_ctr[0], num_rows); break; - case GRAY_RGB_CONVERT: gray_rgb_convert (cinfo, upsample.color_buf, upsample.color_buf_offset, upsample.next_row_out, output_buf, out_row_ctr[0], num_rows); break; - case YCCK_CMYK_CONVERT: error(); break; - } - - /* Adjust counts */ - out_row_ctr[0] += num_rows; - upsample.rows_to_go -= num_rows; - upsample.next_row_out += num_rows; - /* When the buffer is emptied, declare this input row group consumed */ - if (upsample.next_row_out >= cinfo.max_v_samp_factor) { - in_row_group_ctr[0]++; - } -} - -static void noop_upsample (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - byte[][] input_data, int input_data_offset, byte[][][] output_data_ptr, int[] output_data_offset, int output_data_index) -{ - output_data_ptr[output_data_index] = null; /* safety check */ -} - -static void fullsize_upsample (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - byte[][] input_data, int input_data_offset, byte[][][] output_data_ptr, int[] output_data_offset, int output_data_index) -{ - output_data_ptr[output_data_index] = input_data; - output_data_offset[output_data_index] = input_data_offset; -} - -static void h2v1_upsample (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - byte[][] input_data, int input_data_offset, byte[][][] output_data_ptr, int[] output_data_offset, int output_data_index) -{ - byte[][] output_data = output_data_ptr[output_data_index]; - byte[] inptr, outptr; - byte invalue; - int outend; - int inrow; - output_data_offset[output_data_index] = 0; - - for (inrow = 0; inrow < cinfo.max_v_samp_factor; inrow++) { - inptr = input_data[inrow+input_data_offset]; - outptr = output_data[inrow]; - int inptr_offset = 0, outptr_offset = 0; - outend = outptr_offset + cinfo.output_width; - while (outptr_offset < outend) { - invalue = inptr[inptr_offset++]; /* don't need GETJSAMPLE() here */ - outptr[outptr_offset++] = invalue; - outptr[outptr_offset++] = invalue; - } - } -} - -static void h2v2_upsample (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - byte[][] input_data, int input_data_offset, byte[][][] output_data_ptr, int[] output_data_offset, int output_data_index) -{ - byte[][] output_data = output_data_ptr[output_data_index]; - byte[] inptr, outptr; - byte invalue; - int outend; - int inrow, outrow; - output_data_offset[output_data_index] = 0; - - inrow = outrow = 0; - while (outrow < cinfo.max_v_samp_factor) { - inptr = input_data[inrow+input_data_offset]; - outptr = output_data[outrow]; - int inptr_offset = 0, outptr_offset = 0; - outend = outptr_offset + cinfo.output_width; - while (outptr_offset < outend) { - invalue = inptr[inptr_offset++]; /* don't need GETJSAMPLE() here */ - outptr[outptr_offset++] = invalue; - outptr[outptr_offset++] = invalue; - } - jcopy_sample_rows(output_data, outrow, output_data, outrow+1, 1, cinfo.output_width); - inrow++; - outrow += 2; - } -} - -static void h2v1_fancy_upsample (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - byte[][] input_data, int input_data_offset, byte[][][] output_data_ptr, int[] output_data_offset, int output_data_index) -{ - byte[][] output_data = output_data_ptr[output_data_index]; - byte[] inptr, outptr; - int invalue; - int colctr; - int inrow; - output_data_offset[output_data_index] = 0; - - for (inrow = 0; inrow < cinfo.max_v_samp_factor; inrow++) { - inptr = input_data[inrow+input_data_offset]; - outptr = output_data[inrow]; - int inptr_offset = 0, outptr_offset = 0; - /* Special case for first column */ - invalue = inptr[inptr_offset++] & 0xFF; - outptr[outptr_offset++] = (byte) invalue; - outptr[outptr_offset++] = (byte) ((invalue * 3 + (inptr[inptr_offset] & 0xFF) + 2) >> 2); - - for (colctr = compptr.downsampled_width - 2; colctr > 0; colctr--) { - /* General case: 3/4 * nearer pixel + 1/4 * further pixel */ - invalue = (inptr[inptr_offset++] & 0xFF) * 3; - outptr[outptr_offset++] = (byte) ((invalue + (inptr[inptr_offset-2] & 0xFF) + 1) >> 2); - outptr[outptr_offset++] = (byte) ((invalue + (inptr[inptr_offset] & 0xFF) + 2) >> 2); - } - - /* Special case for last column */ - invalue = (inptr[inptr_offset] & 0xFF); - outptr[outptr_offset++] = (byte) ((invalue * 3 + (inptr[inptr_offset-1] & 0xFF) + 1) >> 2); - outptr[outptr_offset++] = (byte) invalue; - } -} - -static void h2v2_fancy_upsample (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - byte[][] input_data, int input_data_offset, byte[][][] output_data_ptr, int[] output_data_offset, int output_data_index) -{ - byte[][] output_data = output_data_ptr[output_data_index]; - byte[] inptr0, inptr1, outptr; - int thiscolsum, lastcolsum, nextcolsum; - int colctr; - int inrow, outrow, v; - output_data_offset[output_data_index] = 0; - - inrow = outrow = 0; - while (outrow < cinfo.max_v_samp_factor) { - for (v = 0; v < 2; v++) { - /* inptr0 points to nearest input row, inptr1 points to next nearest */ - inptr0 = input_data[inrow+input_data_offset]; - if (v == 0) /* next nearest is row above */ - inptr1 = input_data[inrow-1+input_data_offset]; - else /* next nearest is row below */ - inptr1 = input_data[inrow+1+input_data_offset]; - outptr = output_data[outrow++]; - - int inptr0_offset = 0, inptr1_offset = 0, outptr_offset = 0; - - /* Special case for first column */ - thiscolsum = (inptr0[inptr0_offset++] & 0xFF) * 3 + (inptr1[inptr1_offset++] & 0xFF); - nextcolsum = (inptr0[inptr0_offset++] & 0xFF) * 3 + (inptr1[inptr1_offset++] & 0xFF); - outptr[outptr_offset++] = (byte) ((thiscolsum * 4 + 8) >> 4); - outptr[outptr_offset++] = (byte) ((thiscolsum * 3 + nextcolsum + 7) >> 4); - lastcolsum = thiscolsum; thiscolsum = nextcolsum; - - for (colctr = compptr.downsampled_width - 2; colctr > 0; colctr--) { - /* General case: 3/4 * nearer pixel + 1/4 * further pixel in each */ - /* dimension, thus 9/16, 3/16, 3/16, 1/16 overall */ - nextcolsum = (inptr0[inptr0_offset++] & 0xFF) * 3 + (inptr1[inptr1_offset++] & 0xFF); - outptr[outptr_offset++] = (byte) ((thiscolsum * 3 + lastcolsum + 8) >> 4); - outptr[outptr_offset++] = (byte) ((thiscolsum * 3 + nextcolsum + 7) >> 4); - lastcolsum = thiscolsum; thiscolsum = nextcolsum; - } - - /* Special case for last column */ - outptr[outptr_offset++] = (byte) ((thiscolsum * 3 + lastcolsum + 8) >> 4); - outptr[outptr_offset++] = (byte) ((thiscolsum * 4 + 7) >> 4); - } - inrow++; - } -} - -static void int_upsample (jpeg_decompress_struct cinfo, jpeg_component_info compptr, - byte[][] input_data, int input_data_offset, byte[][][] output_data_ptr, int[] output_data_offset, int output_data_index) -{ - jpeg_upsampler upsample = cinfo.upsample; - byte[][] output_data = output_data_ptr[output_data_index]; - byte[] inptr, outptr; - byte invalue; - int h; - int outend; - int h_expand, v_expand; - int inrow, outrow; - output_data_offset[output_data_index] = 0; - - h_expand = upsample.h_expand[compptr.component_index]; - v_expand = upsample.v_expand[compptr.component_index]; - - inrow = outrow = 0; - while (outrow < cinfo.max_v_samp_factor) { - /* Generate one output row with proper horizontal expansion */ - inptr = input_data[inrow+input_data_offset]; - int inptr_offset = 0; - outptr = output_data[outrow]; - int outptr_offset = 0; - outend = outptr_offset + cinfo.output_width; - while (outptr_offset < outend) { - invalue = inptr[inptr_offset++]; /* don't need GETJSAMPLE() here */ - for (h = h_expand; h > 0; h--) { - outptr[outptr_offset++] = invalue; - } - } - /* Generate any additional output rows by duplicating the first one */ - if (v_expand > 1) { - jcopy_sample_rows(output_data, outrow, output_data, outrow+1, v_expand-1, cinfo.output_width); - } - inrow++; - outrow += v_expand; - } -} - -static void null_convert (jpeg_decompress_struct cinfo, - byte[][][] input_buf, int[] input_buf_offset, int input_row, - byte[][] output_buf, int output_buf_offset, int num_rows) -{ - byte[] inptr, outptr; - int count; - int num_components = cinfo.num_components; - int num_cols = cinfo.output_width; - int ci; - - while (--num_rows >= 0) { - for (ci = 0; ci < num_components; ci++) { - inptr = input_buf[ci][input_row+input_buf_offset[0]]; - outptr = output_buf[output_buf_offset]; - /* BGR instead of RGB */ - int offset = 0; - switch (ci) { - case 2: offset = RGB_BLUE; break; - case 1: offset = RGB_GREEN; break; - case 0: offset = RGB_RED; break; - } - int outptr_offset = offset, inptr_offset = 0; - for (count = num_cols; count > 0; count--) { - outptr[outptr_offset] = inptr[inptr_offset++]; /* needn't bother with GETJSAMPLE() here */ - outptr_offset += num_components; - } - } - input_row++; - output_buf_offset++; - } -} - -static void grayscale_convert (jpeg_decompress_struct cinfo, - byte[][][] input_buf, int[] input_buf_offset, int input_row, - byte[][] output_buf, int output_buf_offset, int num_rows) -{ - jcopy_sample_rows(input_buf[0], input_row+input_buf_offset[0], output_buf, output_buf_offset, - num_rows, cinfo.output_width); -} - -static void gray_rgb_convert (jpeg_decompress_struct cinfo, - byte[][][] input_buf, int[] input_buf_offset, int input_row, - byte[][] output_buf, int output_buf_offset, int num_rows) -{ - byte[] inptr, outptr; - int col; - int num_cols = cinfo.output_width; - - while (--num_rows >= 0) { - inptr = input_buf[0][input_row+++input_buf_offset[0]]; - outptr = output_buf[output_buf_offset++]; - int outptr_offset = 0; - for (col = 0; col < num_cols; col++) { - /* We can dispense with GETJSAMPLE() here */ - outptr[RGB_RED+outptr_offset] = outptr[RGB_GREEN+outptr_offset] = outptr[RGB_BLUE+outptr_offset] = inptr[col]; - outptr_offset += RGB_PIXELSIZE; - } - } -} - -static void ycc_rgb_convert (jpeg_decompress_struct cinfo, - byte[][][] input_buf, int[] input_buf_offset, int input_row, - byte[][] output_buf, int output_buf_offset, int num_rows) -{ - jpeg_color_deconverter cconvert = cinfo.cconvert; - int y, cb, cr; - byte[] outptr; - byte[] inptr0, inptr1, inptr2; - int col; - int num_cols = cinfo.output_width; - /* copy these pointers into registers if possible */ - byte[] range_limit = cinfo.sample_range_limit; - int range_limit_offset = cinfo.sample_range_limit_offset; - int[] Crrtab = cconvert.Cr_r_tab; - int[] Cbbtab = cconvert.Cb_b_tab; - int[] Crgtab = cconvert.Cr_g_tab; - int[] Cbgtab = cconvert.Cb_g_tab; -// SHIFT_TEMPS - - while (--num_rows >= 0) { - inptr0 = input_buf[0][input_row+input_buf_offset[0]]; - inptr1 = input_buf[1][input_row+input_buf_offset[1]]; - inptr2 = input_buf[2][input_row+input_buf_offset[2]]; - input_row++; - outptr = output_buf[output_buf_offset++]; - int outptr_offset = 0; - for (col = 0; col < num_cols; col++) { - y = (inptr0[col] & 0xFF); - cb = (inptr1[col] & 0xFF); - cr = (inptr2[col] & 0xFF); - /* Range-limiting is essential due to noise introduced by DCT losses. */ - outptr[outptr_offset + RGB_RED] = range_limit[y + Crrtab[cr] + range_limit_offset]; - outptr[outptr_offset + RGB_GREEN] = range_limit[y + ((Cbgtab[cb] + Crgtab[cr]>>SCALEBITS)) + range_limit_offset]; - outptr[outptr_offset + RGB_BLUE] = range_limit[y + Cbbtab[cb] + range_limit_offset]; - outptr_offset += RGB_PIXELSIZE; - } - } -} - -static boolean process_APPn(int n, jpeg_decompress_struct cinfo) { - if (n == 0 || n == 14) { - return get_interesting_appn(cinfo); - } - return skip_variable(cinfo); -} - -static boolean process_COM(jpeg_decompress_struct cinfo) { - return skip_variable(cinfo); -} - -static void skip_input_data (jpeg_decompress_struct cinfo, int num_bytes) { - if (num_bytes > 0) { - while (num_bytes > cinfo.bytes_in_buffer - cinfo.bytes_offset) { - num_bytes -= cinfo.bytes_in_buffer - cinfo.bytes_offset; - if (!fill_input_buffer(cinfo)) error(); - /* note we assume that fill_input_buffer will never return FALSE, - * so suspension need not be handled. - */ - } - cinfo.bytes_offset += num_bytes; - } -} - -static boolean skip_variable (jpeg_decompress_struct cinfo) -/* Skip over an unknown or uninteresting variable-length marker */ -{ - int length; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - - length -= 2; - -// TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo.unread_marker, (int) length); - - if (length > 0) { - skip_input_data (cinfo, length); - } - - return true; -} - -static boolean get_interesting_appn (jpeg_decompress_struct cinfo) -/* Process an APP0 or APP14 marker without saving it */ -{ - int length; - byte[] b = new byte[APPN_DATA_LEN]; - int i, numtoread; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length = (cinfo.buffer[cinfo.bytes_offset++] & 0xFF) << 8; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - length |= cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - length -= 2; - - /* get the interesting part of the marker data */ - if (length >= APPN_DATA_LEN) - numtoread = APPN_DATA_LEN; - else if (length > 0) - numtoread = length; - else - numtoread = 0; - for (i = 0; i < numtoread; i++) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - b[i] = cinfo.buffer[cinfo.bytes_offset++]; - } - length -= numtoread; - - /* process it */ - switch (cinfo.unread_marker) { - case M_APP0: - examine_app0(cinfo, b, numtoread, length); - break; - case M_APP14: - examine_app14(cinfo, b, numtoread, length); - break; - default: - /* can't get here unless jpeg_save_markers chooses wrong processor */ - error(); -// ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo.unread_marker); - break; - } - - /* skip any remaining data -- could be lots */ - if (length > 0) - skip_input_data (cinfo, length); - - return true; -} - -static void examine_app0 (jpeg_decompress_struct cinfo, byte[] data, int datalen, int remaining) -/* Examine first few bytes from an APP0. - * Take appropriate action if it is a JFIF marker. - * datalen is # of bytes at data[], remaining is length of rest of marker data. - */ -{ - int totallen = datalen + remaining; - - if (datalen >= APP0_DATA_LEN && - (data[0] & 0xFF) == 0x4A && - (data[1] & 0xFF) == 0x46 && - (data[2] & 0xFF) == 0x49 && - (data[3] & 0xFF) == 0x46 && - (data[4] & 0xFF) == 0) - { - /* Found JFIF APP0 marker: save info */ - cinfo.saw_JFIF_marker = true; - cinfo.JFIF_major_version = (data[5]); - cinfo.JFIF_minor_version = (byte)(data[6] & 0xFF); - cinfo.density_unit = (byte)(data[7] & 0xFF); - cinfo.X_density = (short)(((data[8] & 0xFF) << 8) + (data[9] & 0xFF)); - cinfo.Y_density = (short)(((data[10] & 0xFF) << 8) + (data[11] & 0xFF)); - /* Check version. - * Major version must be 1, anything else signals an incompatible change. - * (We used to treat this as an error, but now it's a nonfatal warning, - * because some bozo at Hijaak couldn't read the spec.) - * Minor version should be 0..2, but process anyway if newer. - */ - if (cinfo.JFIF_major_version != 1) { -// WARNMS2(cinfo, JWRN_JFIF_MAJOR, -// cinfo.JFIF_major_version, cinfo.JFIF_minor_version); - } - /* Generate trace messages */ -// TRACEMS5(cinfo, 1, JTRC_JFIF, -// cinfo.JFIF_major_version, cinfo.JFIF_minor_version, -// cinfo.X_density, cinfo.Y_density, cinfo.density_unit); - /* Validate thumbnail dimensions and issue appropriate messages */ - if (((data[12] & 0xFF) | (data[13]) & 0xFF) != 0) { -// TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL, -// GETJOCTET(data[12]), GETJOCTET(data[13])); - } - totallen -= APP0_DATA_LEN; - if (totallen != ((data[12] & 0xFF) * (data[13] & 0xFF) * 3)) { -// TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen); - } - } else if (datalen >= 6 && - (data[0] & 0xFF) == 0x4A && - (data[1] & 0xFF) == 0x46 && - (data[2] & 0xFF) == 0x58 && - (data[3] & 0xFF) == 0x58 && - (data[4] & 0xFF) == 0) - { - /* Found JFIF "JFXX" extension APP0 marker */ - /* The library doesn't actually do anything with these, - * but we try to produce a helpful trace message. - */ - switch ((data[5]) & 0xFF) { - case 0x10: -// TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen); - break; - case 0x11: -// TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen); - break; - case 0x13: -// TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen); - break; - default: -// TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION, GETJOCTET(data[5]), (int) totallen); - break; - } - } else { - /* Start of APP0 does not match "JFIF" or "JFXX", or too short */ -// TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen); - } -} - -static void examine_app14 (jpeg_decompress_struct cinfo, byte[] data, int datalen, int remaining) -/* Examine first few bytes from an APP14. - * Take appropriate action if it is an Adobe marker. - * datalen is # of bytes at data[], remaining is length of rest of marker data. - */ -{ - int /*version, flags0, flags1, */transform; - - if (datalen >= APP14_DATA_LEN && - (data[0] & 0xFF) == 0x41 && - (data[1] & 0xFF) == 0x64 && - (data[2] & 0xFF) == 0x6F && - (data[3] & 0xFF) == 0x62 && - (data[4] & 0xFF) == 0x65) - { - /* Found Adobe APP14 marker */ -// version = ((data[5] & 0xFF) << 8) + (data[6] & 0xFF); -// flags0 = ((data[7] & 0xFF) << 8) + (data[8] & 0xFF); -// flags1 = ((data[9] & 0xFF) << 8) + (data[10] & 0xFF); - transform = (data[11] & 0xFF); -// TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform); - cinfo.saw_Adobe_marker = true; - cinfo.Adobe_transform = (byte) transform; - } else { - /* Start of APP14 does not match "Adobe", or too short */ -// TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining)); - } -} - -static boolean get_soi (jpeg_decompress_struct cinfo) /* Process an SOI marker */ { - int i; - -// TRACEMS(cinfo, 1, JTRC_SOI); - - if (cinfo.marker.saw_SOI) - error(); -// ERREXIT(cinfo, JERR_SOI_DUPLICATE); - - /* Reset all parameters that are defined to be reset by SOI */ - - for (i = 0; i < NUM_ARITH_TBLS; i++) { - cinfo.arith_dc_L[i] = 0; - cinfo.arith_dc_U[i] = 1; - cinfo.arith_ac_K[i] = 5; - } - cinfo.restart_interval = 0; - - /* Set initial assumptions for colorspace etc */ - - cinfo.jpeg_color_space = JCS_UNKNOWN; - cinfo.CCIR601_sampling = false; /* Assume non-CCIR sampling??? */ - - cinfo.saw_JFIF_marker = false; - cinfo.JFIF_major_version = 1; /* set default JFIF APP0 values */ - cinfo.JFIF_minor_version = 1; - cinfo.density_unit = 0; - cinfo.X_density = 1; - cinfo.Y_density = 1; - cinfo.saw_Adobe_marker = false; - cinfo.Adobe_transform = 0; - - cinfo.marker.saw_SOI = true; - - return true; -} - -static void jinit_input_controller (jpeg_decompress_struct cinfo) -{ - /* Initialize state: can't use reset_input_controller since we don't - * want to try to reset other modules yet. - */ - jpeg_input_controller inputctl = cinfo.inputctl = new jpeg_input_controller(); - inputctl.has_multiple_scans = false; /* "unknown" would be better */ - inputctl.eoi_reached = false; - inputctl.inheaders = true; -} - -static void reset_marker_reader (jpeg_decompress_struct cinfo) { - jpeg_marker_reader marker = cinfo.marker; - - cinfo.comp_info = null; /* until allocated by get_sof */ - cinfo.input_scan_number = 0; /* no SOS seen yet */ - cinfo.unread_marker = 0; /* no pending marker */ - marker.saw_SOI = false; /* set internal state too */ - marker.saw_SOF = false; - marker.discarded_bytes = 0; -// marker.cur_marker = null; -} - -static void reset_input_controller (jpeg_decompress_struct cinfo) { - jpeg_input_controller inputctl = cinfo.inputctl; - - inputctl.has_multiple_scans = false; /* "unknown" would be better */ - inputctl.eoi_reached = false; - inputctl.inheaders = true; - /* Reset other modules */ - reset_marker_reader (cinfo); - /* Reset progression state -- would be cleaner if entropy decoder did this */ - cinfo.coef_bits = null; -} - -static void finish_output_pass (jpeg_decompress_struct cinfo) { - jpeg_decomp_master master = cinfo.master; - - if (cinfo.quantize_colors) { - error(SWT.ERROR_NOT_IMPLEMENTED); -// (*cinfo.cquantize.finish_pass) (cinfo); - } - master.pass_number++; -} - -static void jpeg_destroy (jpeg_decompress_struct cinfo) { - /* We need only tell the memory manager to release everything. */ - /* NB: mem pointer is NULL if memory mgr failed to initialize. */ -// if (cinfo.mem != NULL) -// (*cinfo.mem.self_destruct) (cinfo); -// cinfo.mem = NULL; /* be safe if jpeg_destroy is called twice */ - cinfo.global_state = 0; /* mark it destroyed */ -} - -static void jpeg_destroy_decompress (jpeg_decompress_struct cinfo) { - jpeg_destroy(cinfo); /* use common routine */ -} - -static boolean jpeg_input_complete (jpeg_decompress_struct cinfo) { - /* Check for valid jpeg object */ - if (cinfo.global_state < DSTATE_START || cinfo.global_state > DSTATE_STOPPING) - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - return cinfo.inputctl.eoi_reached; -} - -static boolean jpeg_start_output (jpeg_decompress_struct cinfo, int scan_number) { - if (cinfo.global_state != DSTATE_BUFIMAGE && cinfo.global_state != DSTATE_PRESCAN) - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - /* Limit scan number to valid range */ - if (scan_number <= 0) - scan_number = 1; - if (cinfo.inputctl.eoi_reached && scan_number > cinfo.input_scan_number) - scan_number = cinfo.input_scan_number; - cinfo.output_scan_number = scan_number; - /* Perform any dummy output passes, and set up for the real pass */ - return output_pass_setup(cinfo); -} - -static boolean jpeg_finish_output (jpeg_decompress_struct cinfo) { - if ((cinfo.global_state == DSTATE_SCANNING || cinfo.global_state == DSTATE_RAW_OK) && cinfo.buffered_image) { - /* Terminate this pass. */ - /* We do not require the whole pass to have been completed. */ - finish_output_pass (cinfo); - cinfo.global_state = DSTATE_BUFPOST; - } else if (cinfo.global_state != DSTATE_BUFPOST) { - /* BUFPOST = repeat call after a suspension, anything else is error */ - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - } - /* Read markers looking for SOS or EOI */ - while (cinfo.input_scan_number <= cinfo.output_scan_number && !cinfo.inputctl.eoi_reached) { - if (consume_input (cinfo) == JPEG_SUSPENDED) - return false; /* Suspend, come back later */ - } - cinfo.global_state = DSTATE_BUFIMAGE; - return true; -} - -static boolean jpeg_finish_decompress (jpeg_decompress_struct cinfo) { - if ((cinfo.global_state == DSTATE_SCANNING || cinfo.global_state == DSTATE_RAW_OK) && ! cinfo.buffered_image) { - /* Terminate final pass of non-buffered mode */ - if (cinfo.output_scanline < cinfo.output_height) - error(); -// ERREXIT(cinfo, JERR_TOO_LITTLE_DATA); - finish_output_pass (cinfo); - cinfo.global_state = DSTATE_STOPPING; - } else if (cinfo.global_state == DSTATE_BUFIMAGE) { - /* Finishing after a buffered-image operation */ - cinfo.global_state = DSTATE_STOPPING; - } else if (cinfo.global_state != DSTATE_STOPPING) { - /* STOPPING = repeat call after a suspension, anything else is error */ - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - } - /* Read until EOI */ - while (! cinfo.inputctl.eoi_reached) { - if (consume_input (cinfo) == JPEG_SUSPENDED) - return false; /* Suspend, come back later */ - } - /* Do final cleanup */ -// (*cinfo.src.term_source) (cinfo); - /* We can use jpeg_abort to release memory and reset global_state */ - jpeg_abort(cinfo); - return true; -} - - -static int jpeg_read_header (jpeg_decompress_struct cinfo, boolean require_image) { - int retcode; - - if (cinfo.global_state != DSTATE_START && cinfo.global_state != DSTATE_INHEADER) - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - - retcode = jpeg_consume_input(cinfo); - - switch (retcode) { - case JPEG_REACHED_SOS: - retcode = JPEG_HEADER_OK; - break; - case JPEG_REACHED_EOI: - if (require_image) /* Complain if application wanted an image */ - error(); -// ERREXIT(cinfo, JERR_NO_IMAGE); - /* Reset to start state; it would be safer to require the application to - * call jpeg_abort, but we can't change it now for compatibility reasons. - * A side effect is to free any temporary memory (there shouldn't be any). - */ - jpeg_abort(cinfo); /* sets state = DSTATE_START */ - retcode = JPEG_HEADER_TABLES_ONLY; - break; - case JPEG_SUSPENDED: - /* no work */ - break; - } - - return retcode; -} - -static int dummy_consume_data (jpeg_decompress_struct cinfo) { - return JPEG_SUSPENDED; /* Always indicate nothing was done */ -} - -static int consume_data (jpeg_decompress_struct cinfo) { - jpeg_d_coef_controller coef = cinfo.coef; - int MCU_col_num; /* index of current MCU within row */ - int blkn, ci, xindex, yindex, yoffset; - int start_col; -// short[][][][] buffer = new short[MAX_COMPS_IN_SCAN][][][]; - short[][] buffer_ptr; - jpeg_component_info compptr; - -// /* Align the virtual buffers for the components used in this scan. */ -// for (ci = 0; ci < cinfo.comps_in_scan; ci++) { -// compptr = cinfo.cur_comp_info[ci]; -// buffer[ci] = coef.whole_image[compptr.component_index]; -// /* Note: entropy decoder expects buffer to be zeroed, -// * but this is handled automatically by the memory manager -// * because we requested a pre-zeroed array. -// */ -// } - - /* Loop to process one whole iMCU row */ - for (yoffset = coef.MCU_vert_offset; yoffset < coef.MCU_rows_per_iMCU_row; yoffset++) { - for (MCU_col_num = coef.MCU_ctr; MCU_col_num < cinfo.MCUs_per_row; MCU_col_num++) { - /* Construct list of pointers to DCT blocks belonging to this MCU */ - blkn = 0; /* index of current DCT block within MCU */ - for (ci = 0; ci < cinfo.comps_in_scan; ci++) { - compptr = cinfo.cur_comp_info[ci]; - start_col = MCU_col_num * compptr.MCU_width; - for (yindex = 0; yindex < compptr.MCU_height; yindex++) { -// buffer_ptr = buffer[ci][yindex+yoffset] + start_col; - buffer_ptr = coef.whole_image[compptr.component_index][yindex+yoffset+cinfo.input_iMCU_row*compptr.v_samp_factor]; - int buffer_ptr_offset = start_col; - for (xindex = 0; xindex < compptr.MCU_width; xindex++) { - coef.MCU_buffer[blkn++] = buffer_ptr[buffer_ptr_offset++]; - } - } - } - /* Try to fetch the MCU. */ - if (! cinfo.entropy.decode_mcu (cinfo, coef.MCU_buffer)) { - /* Suspension forced; update state counters and exit */ - coef.MCU_vert_offset = yoffset; - coef.MCU_ctr = MCU_col_num; - return JPEG_SUSPENDED; - } - } - /* Completed an MCU row, but perhaps not an iMCU row */ - coef.MCU_ctr = 0; - } - /* Completed the iMCU row, advance counters for next one */ - if (++(cinfo.input_iMCU_row) < cinfo.total_iMCU_rows) { - coef.start_iMCU_row(cinfo); - return JPEG_ROW_COMPLETED; - } - /* Completed the scan */ - finish_input_pass (cinfo); - return JPEG_SCAN_COMPLETED; -} - -static int consume_input (jpeg_decompress_struct cinfo) { - switch (cinfo.inputctl.consume_input) { - case COEF_CONSUME_INPUT: - switch (cinfo.coef.consume_data) { - case CONSUME_DATA: return consume_data(cinfo); - case DUMMY_CONSUME_DATA: return dummy_consume_data(cinfo); - default: error(); - } - break; - case INPUT_CONSUME_INPUT: - return consume_markers(cinfo); - default: - error(); - } - return 0; -} - -static boolean fill_input_buffer(jpeg_decompress_struct cinfo) { - try { - InputStream inputStream = cinfo.inputStream; - int nbytes = inputStream.read(cinfo.buffer); - if (nbytes <= 0) { - if (cinfo.start_of_file) /* Treat empty input file as fatal error */ - error(); -// ERREXIT(cinfo, JERR_INPUT_EMPTY); -// WARNMS(cinfo, JWRN_JPEG_EOF); - /* Insert a fake EOI marker */ - cinfo.buffer[0] = (byte)0xFF; - cinfo.buffer[1] = (byte)M_EOI; - nbytes = 2; - } - cinfo.bytes_in_buffer = nbytes; - cinfo.bytes_offset = 0; - cinfo.start_of_file = false; - } catch (IOException e) { - error(SWT.ERROR_IO); - return false; - } - return true; -} - -static boolean first_marker (jpeg_decompress_struct cinfo) { - /* Like next_marker, but used to obtain the initial SOI marker. */ - /* For this marker, we do not allow preceding garbage or fill; otherwise, - * we might well scan an entire input file before realizing it ain't JPEG. - * If an application wants to process non-JFIF files, it must seek to the - * SOI before calling the JPEG library. - */ - int c, c2; - - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c2 = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - if (c != 0xFF || c2 != M_SOI) - error(); -// ERREXIT2(cinfo, JERR_NO_SOI, c, c2); - - cinfo.unread_marker = c2; - - return true; -} - -static boolean next_marker (jpeg_decompress_struct cinfo) { - int c; - - for (;;) { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - /* Skip any non-FF bytes. - * This may look a bit inefficient, but it will not occur in a valid file. - * We sync after each discarded byte so that a suspending data source - * can discard the byte from its buffer. - */ - while (c != 0xFF) { - cinfo.marker.discarded_bytes++; - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - } - /* This loop swallows any duplicate FF bytes. Extra FFs are legal as - * pad bytes, so don't count them in discarded_bytes. We assume there - * will not be so many consecutive FF bytes as to overflow a suspending - * data source's input buffer. - */ - do { - if (cinfo.bytes_offset == cinfo.bytes_in_buffer) fill_input_buffer(cinfo); - c = cinfo.buffer[cinfo.bytes_offset++] & 0xFF; - } while (c == 0xFF); - if (c != 0) - break; /* found a valid marker, exit loop */ - /* Reach here if we found a stuffed-zero data sequence (FF/00). - * Discard it and loop back to try again. - */ - cinfo.marker.discarded_bytes += 2; - } - - if (cinfo.marker.discarded_bytes != 0) { -// WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo.marker.discarded_bytes, c); - cinfo.marker.discarded_bytes = 0; - } - - cinfo.unread_marker = c; - - return true; -} - -static int read_markers (jpeg_decompress_struct cinfo) { - /* Outer loop repeats once for each marker. */ - for (;;) { - /* Collect the marker proper, unless we already did. */ - /* NB: first_marker() enforces the requirement that SOI appear first. */ - if (cinfo.unread_marker == 0) { - if (! cinfo.marker.saw_SOI) { - if (! first_marker(cinfo)) - return JPEG_SUSPENDED; - } else { - if (! next_marker(cinfo)) - return JPEG_SUSPENDED; - } - } - /* At this point cinfo.unread_marker contains the marker code and the - * input point is just past the marker proper, but before any parameters. - * A suspension will cause us to return with this state still true. - */ - switch (cinfo.unread_marker) { - case M_SOI: - if (! get_soi(cinfo)) - return JPEG_SUSPENDED; - break; - - case M_SOF0: /* Baseline */ - case M_SOF1: /* Extended sequential, Huffman */ - if (! get_sof(cinfo, false, false)) - return JPEG_SUSPENDED; - break; - - case M_SOF2: /* Progressive, Huffman */ - if (! get_sof(cinfo, true, false)) - return JPEG_SUSPENDED; - break; - - case M_SOF9: /* Extended sequential, arithmetic */ - if (! get_sof(cinfo, false, true)) - return JPEG_SUSPENDED; - break; - - case M_SOF10: /* Progressive, arithmetic */ - if (! get_sof(cinfo, true, true)) - return JPEG_SUSPENDED; - break; - - /* Currently unsupported SOFn types */ - case M_SOF3: /* Lossless, Huffman */ - case M_SOF5: /* Differential sequential, Huffman */ - case M_SOF6: /* Differential progressive, Huffman */ - case M_SOF7: /* Differential lossless, Huffman */ - case M_JPG: /* Reserved for JPEG extensions */ - case M_SOF11: /* Lossless, arithmetic */ - case M_SOF13: /* Differential sequential, arithmetic */ - case M_SOF14: /* Differential progressive, arithmetic */ - case M_SOF15: /* Differential lossless, arithmetic */ - error(); -// ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo.unread_marker); - break; - - case M_SOS: - if (! get_sos(cinfo)) - return JPEG_SUSPENDED; - cinfo.unread_marker = 0; /* processed the marker */ - return JPEG_REACHED_SOS; - - case M_EOI: -// TRACEMS(cinfo, 1, JTRC_EOI); - cinfo.unread_marker = 0; /* processed the marker */ - return JPEG_REACHED_EOI; - - case M_DAC: - if (! get_dac(cinfo)) - return JPEG_SUSPENDED; - break; - - case M_DHT: - if (! get_dht(cinfo)) - return JPEG_SUSPENDED; - break; - - case M_DQT: - if (! get_dqt(cinfo)) - return JPEG_SUSPENDED; - break; - - case M_DRI: - if (! get_dri(cinfo)) - return JPEG_SUSPENDED; - break; - - case M_APP0: - case M_APP1: - case M_APP2: - case M_APP3: - case M_APP4: - case M_APP5: - case M_APP6: - case M_APP7: - case M_APP8: - case M_APP9: - case M_APP10: - case M_APP11: - case M_APP12: - case M_APP13: - case M_APP14: - case M_APP15: - if (! process_APPn(cinfo.unread_marker - M_APP0, cinfo)) - return JPEG_SUSPENDED; - break; - - case M_COM: - if (! process_COM(cinfo)) - return JPEG_SUSPENDED; - break; - - case M_RST0: /* these are all parameterless */ - case M_RST1: - case M_RST2: - case M_RST3: - case M_RST4: - case M_RST5: - case M_RST6: - case M_RST7: - case M_TEM: -// TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo.unread_marker); - break; - - case M_DNL: /* Ignore DNL ... perhaps the wrong thing */ - if (! skip_variable(cinfo)) - return JPEG_SUSPENDED; - break; - - default: /* must be DHP, EXP, JPGn, or RESn */ - /* For now, we treat the reserved markers as fatal errors since they are - * likely to be used to signal incompatible JPEG Part 3 extensions. - * Once the JPEG 3 version-number marker is well defined, this code - * ought to change! - */ - error(); - // ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo.unread_marker); - break; - } - /* Successfully processed marker, so reset state variable */ - cinfo.unread_marker = 0; - } /* end loop */ -} - -static long jdiv_round_up (long a, long b) -/* Compute a/b rounded up to next integer, ie, ceil(a/b) */ -/* Assumes a >= 0, b > 0 */ -{ - return (a + b - 1) / b; -} - -static void initial_setup (jpeg_decompress_struct cinfo) -/* Called once, when first SOS marker is reached */ -{ - int ci; - jpeg_component_info compptr; - - /* Make sure image isn't bigger than I can handle */ - if (cinfo.image_height > JPEG_MAX_DIMENSION || cinfo.image_width > JPEG_MAX_DIMENSION) - error(); -// ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); - - /* For now, precision must match compiled-in value... */ - if (cinfo.data_precision != BITS_IN_JSAMPLE) - error(" [data precision=" + cinfo.data_precision + "]"); -// ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo.data_precision); - - /* Check that number of components won't exceed internal array sizes */ - if (cinfo.num_components > MAX_COMPONENTS) - error(); -// ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo.num_components, MAX_COMPONENTS); - - /* Compute maximum sampling factors; check factor validity */ - cinfo.max_h_samp_factor = 1; - cinfo.max_v_samp_factor = 1; - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - if (compptr.h_samp_factor<=0 || compptr.h_samp_factor>MAX_SAMP_FACTOR || compptr.v_samp_factor<=0 || compptr.v_samp_factor>MAX_SAMP_FACTOR) - error(); -// ERREXIT(cinfo, JERR_BAD_SAMPLING); - cinfo.max_h_samp_factor = Math.max(cinfo.max_h_samp_factor, compptr.h_samp_factor); - cinfo.max_v_samp_factor = Math.max(cinfo.max_v_samp_factor, compptr.v_samp_factor); - } - - /* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE. - * In the full decompressor, this will be overridden by jdmaster.c; - * but in the transcoder, jdmaster.c is not used, so we must do it here. - */ - cinfo.min_DCT_scaled_size = DCTSIZE; - - /* Compute dimensions of components */ - for (ci = 0; ci < cinfo.num_components; ci++) { - compptr = cinfo.comp_info[ci]; - compptr.DCT_scaled_size = DCTSIZE; - /* Size in DCT blocks */ - compptr.width_in_blocks = (int)jdiv_round_up((long) cinfo.image_width * (long) compptr.h_samp_factor, (cinfo.max_h_samp_factor * DCTSIZE)); - compptr.height_in_blocks = (int)jdiv_round_up((long) cinfo.image_height * (long) compptr.v_samp_factor, (cinfo.max_v_samp_factor * DCTSIZE)); - /* downsampled_width and downsampled_height will also be overridden by - * jdmaster.c if we are doing full decompression. The transcoder library - * doesn't use these values, but the calling application might. - */ - /* Size in samples */ - compptr.downsampled_width = (int)jdiv_round_up((long) cinfo.image_width * (long) compptr.h_samp_factor, cinfo.max_h_samp_factor); - compptr.downsampled_height = (int)jdiv_round_up((long) cinfo.image_height * (long) compptr.v_samp_factor, cinfo.max_v_samp_factor); - /* Mark component needed, until color conversion says otherwise */ - compptr.component_needed = true; - /* Mark no quantization table yet saved for component */ - compptr.quant_table = null; - } - - /* Compute number of fully interleaved MCU rows. */ - cinfo.total_iMCU_rows = (int)jdiv_round_up( cinfo.image_height, (cinfo.max_v_samp_factor*DCTSIZE)); - - /* Decide whether file contains multiple scans */ - if (cinfo.comps_in_scan < cinfo.num_components || cinfo.progressive_mode) - cinfo.inputctl.has_multiple_scans = true; - else - cinfo.inputctl.has_multiple_scans = false; -} - - -static void per_scan_setup (jpeg_decompress_struct cinfo) -/* Do computations that are needed before processing a JPEG scan */ -/* cinfo.comps_in_scan and cinfo.cur_comp_info[] were set from SOS marker */ -{ - int ci, mcublks, tmp = 0; - jpeg_component_info compptr; - - if (cinfo.comps_in_scan == 1) { - - /* Noninterleaved (single-component) scan */ - compptr = cinfo.cur_comp_info[0]; - - /* Overall image size in MCUs */ - cinfo.MCUs_per_row = compptr.width_in_blocks; - cinfo.MCU_rows_in_scan = compptr.height_in_blocks; - - /* For noninterleaved scan, always one block per MCU */ - compptr.MCU_width = 1; - compptr.MCU_height = 1; - compptr.MCU_blocks = 1; - compptr.MCU_sample_width = compptr.DCT_scaled_size; - compptr.last_col_width = 1; - /* For noninterleaved scans, it is convenient to define last_row_height - * as the number of block rows present in the last iMCU row. - */ - tmp = (compptr.height_in_blocks % compptr.v_samp_factor); - if (tmp == 0) tmp = compptr.v_samp_factor; - compptr.last_row_height = tmp; - - /* Prepare array describing MCU composition */ - cinfo.blocks_in_MCU = 1; - cinfo.MCU_membership[0] = 0; - - } else { - - /* Interleaved (multi-component) scan */ - if (cinfo.comps_in_scan <= 0 || cinfo.comps_in_scan > MAX_COMPS_IN_SCAN) - error(); -// ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo.comps_in_scan, MAX_COMPS_IN_SCAN); - - /* Overall image size in MCUs */ - cinfo.MCUs_per_row = (int)jdiv_round_up( cinfo.image_width, (cinfo.max_h_samp_factor*DCTSIZE)); - cinfo.MCU_rows_in_scan = (int)jdiv_round_up( cinfo.image_height, (cinfo.max_v_samp_factor*DCTSIZE)); - - cinfo.blocks_in_MCU = 0; - - for (ci = 0; ci < cinfo.comps_in_scan; ci++) { - compptr = cinfo.cur_comp_info[ci]; - /* Sampling factors give # of blocks of component in each MCU */ - compptr.MCU_width = compptr.h_samp_factor; - compptr.MCU_height = compptr.v_samp_factor; - compptr.MCU_blocks = compptr.MCU_width * compptr.MCU_height; - compptr.MCU_sample_width = compptr.MCU_width * compptr.DCT_scaled_size; - /* Figure number of non-dummy blocks in last MCU column & row */ - tmp = (compptr.width_in_blocks % compptr.MCU_width); - if (tmp == 0) tmp = compptr.MCU_width; - compptr.last_col_width = tmp; - tmp = (compptr.height_in_blocks % compptr.MCU_height); - if (tmp == 0) tmp = compptr.MCU_height; - compptr.last_row_height = tmp; - /* Prepare array describing MCU composition */ - mcublks = compptr.MCU_blocks; - if (cinfo.blocks_in_MCU + mcublks > D_MAX_BLOCKS_IN_MCU) - error(); -// ERREXIT(cinfo, JERR_BAD_MCU_SIZE); - while (mcublks-- > 0) { - cinfo.MCU_membership[cinfo.blocks_in_MCU++] = ci; - } - } - - } -} - -static void latch_quant_tables (jpeg_decompress_struct cinfo) { - int ci, qtblno; - jpeg_component_info compptr; - JQUANT_TBL qtbl; - - for (ci = 0; ci < cinfo.comps_in_scan; ci++) { - compptr = cinfo.cur_comp_info[ci]; - /* No work if we already saved Q-table for this component */ - if (compptr.quant_table != null) - continue; - /* Make sure specified quantization table is present */ - qtblno = compptr.quant_tbl_no; - if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS || cinfo.quant_tbl_ptrs[qtblno] == null) - error(); -// ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno); - /* OK, save away the quantization table */ - qtbl = new JQUANT_TBL(); - System.arraycopy(cinfo.quant_tbl_ptrs[qtblno].quantval, 0, qtbl.quantval, 0, qtbl.quantval.length); - qtbl.sent_table = cinfo.quant_tbl_ptrs[qtblno].sent_table; - compptr.quant_table = qtbl; - } -} - -static void jpeg_make_d_derived_tbl (jpeg_decompress_struct cinfo, boolean isDC, int tblno, d_derived_tbl dtbl) { - JHUFF_TBL htbl; - int p, i = 0, l, si, numsymbols; - int lookbits, ctr; - byte[] huffsize = new byte[257]; - int[] huffcode = new int[257]; - int code; - - /* Note that huffsize[] and huffcode[] are filled in code-length order, - * paralleling the order of the symbols themselves in htbl.huffval[]. - */ - - /* Find the input Huffman table */ - if (tblno < 0 || tblno >= NUM_HUFF_TBLS) - error(); -// ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno); - htbl = isDC ? cinfo.dc_huff_tbl_ptrs[tblno] : cinfo.ac_huff_tbl_ptrs[tblno]; - if (htbl == null) - error(); -// ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno); - - /* Allocate a workspace if we haven't already done so. */ - dtbl.pub = htbl; /* fill in back link */ - - /* Figure C.1: make table of Huffman code length for each symbol */ - - p = 0; - for (l = 1; l <= 16; l++) { - i = htbl.bits[l] & 0xFF; - if (i < 0 || p + i > 256) /* protect against table overrun */ - error(); -// ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); - while (i-- != 0) - huffsize[p++] = (byte) l; - } - huffsize[p] = 0; - numsymbols = p; - - /* Figure C.2: generate the codes themselves */ - /* We also validate that the counts represent a legal Huffman code tree. */ - - code = 0; - si = huffsize[0]; - p = 0; - while ((huffsize[p]) != 0) { - while (( huffsize[p]) == si) { - huffcode[p++] = code; - code++; - } - /* code is now 1 more than the last code used for codelength si; but - * it must still fit in si bits, since no code is allowed to be all ones. - */ - if (( code) >= (( 1) << si)) - error(); -// ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); - code <<= 1; - si++; - } - - /* Figure F.15: generate decoding tables for bit-sequential decoding */ - - p = 0; - for (l = 1; l <= 16; l++) { - if ((htbl.bits[l] & 0xFF) != 0) { - /* valoffset[l] = huffval[] index of 1st symbol of code length l, - * minus the minimum code of length l - */ - dtbl.valoffset[l] = p - huffcode[p]; - p += (htbl.bits[l] & 0xFF); - dtbl.maxcode[l] = huffcode[p-1]; /* maximum code of length l */ - } else { - dtbl.maxcode[l] = -1; /* -1 if no codes of this length */ - } - } - dtbl.maxcode[17] = 0xFFFFF; /* ensures jpeg_huff_decode terminates */ - - /* Compute lookahead tables to speed up decoding. - * First we set all the table entries to 0, indicating "too long"; - * then we iterate through the Huffman codes that are short enough and - * fill in all the entries that correspond to bit sequences starting - * with that code. - */ - - for (int j = 0; j < dtbl.look_nbits.length; j++) { - dtbl.look_nbits[j] = 0; - } - - p = 0; - for (l = 1; l <= HUFF_LOOKAHEAD; l++) { - for (i = 1; i <= (htbl.bits[l] & 0xFF); i++, p++) { - /* l = current code's length, p = its index in huffcode[] & huffval[]. */ - /* Generate left-justified code followed by all possible bit sequences */ - lookbits = huffcode[p] << (HUFF_LOOKAHEAD-l); - for (ctr = 1 << (HUFF_LOOKAHEAD-l); ctr > 0; ctr--) { - dtbl.look_nbits[lookbits] = l; - dtbl.look_sym[lookbits] = htbl.huffval[p]; - lookbits++; - } - } - } - - /* Validate symbols as being reasonable. - * For AC tables, we make no check, but accept all byte values 0..255. - * For DC tables, we require the symbols to be in range 0..15. - * (Tighter bounds could be applied depending on the data depth and mode, - * but this is sufficient to ensure safe decoding.) - */ - if (isDC) { - for (i = 0; i < numsymbols; i++) { - int sym = htbl.huffval[i] & 0xFF; - if (sym < 0 || sym > 15) - error(); -// ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); - } - } -} - -static void start_input_pass (jpeg_decompress_struct cinfo) { - per_scan_setup(cinfo); - latch_quant_tables(cinfo); - cinfo.entropy.start_pass(cinfo); - cinfo.coef.start_input_pass (cinfo); - cinfo.inputctl.consume_input = COEF_CONSUME_INPUT; -} - -static void finish_input_pass (jpeg_decompress_struct cinfo) { - cinfo.inputctl.consume_input = INPUT_CONSUME_INPUT; -} - -static int consume_markers (jpeg_decompress_struct cinfo) { - jpeg_input_controller inputctl = cinfo.inputctl; - int val; - - if (inputctl.eoi_reached) /* After hitting EOI, read no further */ - return JPEG_REACHED_EOI; - - val = read_markers (cinfo); - - switch (val) { - case JPEG_REACHED_SOS: /* Found SOS */ - if (inputctl.inheaders) { /* 1st SOS */ - initial_setup(cinfo); - inputctl.inheaders = false; - /* Note: start_input_pass must be called by jdmaster.c - * before any more input can be consumed. jdapimin.c is - * responsible for enforcing this sequencing. - */ - } else { /* 2nd or later SOS marker */ - if (! inputctl.has_multiple_scans) - error(); -// ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */ - start_input_pass(cinfo); - } - break; - case JPEG_REACHED_EOI: /* Found EOI */ - inputctl.eoi_reached = true; - if (inputctl.inheaders) { /* Tables-only datastream, apparently */ - if (cinfo.marker.saw_SOF) - error(); -// ERREXIT(cinfo, JERR_SOF_NO_SOS); - } else { - /* Prevent infinite loop in coef ctlr's decompress_data routine - * if user set output_scan_number larger than number of scans. - */ - if (cinfo.output_scan_number > cinfo.input_scan_number) - cinfo.output_scan_number = cinfo.input_scan_number; - } - break; - case JPEG_SUSPENDED: - break; - } - - return val; -} - -static void default_decompress_parms (jpeg_decompress_struct cinfo) { - /* Guess the input colorspace, and set output colorspace accordingly. */ - /* (Wish JPEG committee had provided a real way to specify this...) */ - /* Note application may override our guesses. */ - switch (cinfo.num_components) { - case 1: - cinfo.jpeg_color_space = JCS_GRAYSCALE; - cinfo.out_color_space = JCS_GRAYSCALE; - break; - - case 3: - if (cinfo.saw_JFIF_marker) { - cinfo.jpeg_color_space = JCS_YCbCr; /* JFIF implies YCbCr */ - } else if (cinfo.saw_Adobe_marker) { - switch (cinfo.Adobe_transform) { - case 0: - cinfo.jpeg_color_space = JCS_RGB; - break; - case 1: - cinfo.jpeg_color_space = JCS_YCbCr; - break; - default: -// WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo.Adobe_transform); - cinfo.jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */ - break; - } - } else { - /* Saw no special markers, try to guess from the component IDs */ - int cid0 = cinfo.comp_info[0].component_id; - int cid1 = cinfo.comp_info[1].component_id; - int cid2 = cinfo.comp_info[2].component_id; - - if (cid0 == 1 && cid1 == 2 && cid2 == 3) - cinfo.jpeg_color_space = JCS_YCbCr; /* assume JFIF w/out marker */ - else if (cid0 == 82 && cid1 == 71 && cid2 == 66) - cinfo.jpeg_color_space = JCS_RGB; /* ASCII 'R', 'G', 'B' */ - else { -// TRACEMS3(cinfo, 1, JTRC_UNKNOWN_IDS, cid0, cid1, cid2); - cinfo.jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */ - } - } - /* Always guess RGB is proper output colorspace. */ - cinfo.out_color_space = JCS_RGB; - break; - - case 4: - if (cinfo.saw_Adobe_marker) { - switch (cinfo.Adobe_transform) { - case 0: - cinfo.jpeg_color_space = JCS_CMYK; - break; - case 2: - cinfo.jpeg_color_space = JCS_YCCK; - break; - default: -// WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo.Adobe_transform); - cinfo.jpeg_color_space = JCS_YCCK; /* assume it's YCCK */ - break; - } - } else { - /* No special markers, assume straight CMYK. */ - cinfo.jpeg_color_space = JCS_CMYK; - } - cinfo.out_color_space = JCS_CMYK; - break; - - default: - cinfo.jpeg_color_space = JCS_UNKNOWN; - cinfo.out_color_space = JCS_UNKNOWN; - break; - } - - /* Set defaults for other decompression parameters. */ - cinfo.scale_num = 1; /* 1:1 scaling */ - cinfo.scale_denom = 1; - cinfo.output_gamma = 1.0; - cinfo.buffered_image = false; - cinfo.raw_data_out = false; - cinfo.dct_method = JDCT_DEFAULT; - cinfo.do_fancy_upsampling = true; - cinfo.do_block_smoothing = true; - cinfo.quantize_colors = false; - /* We set these in case application only sets quantize_colors. */ - cinfo.dither_mode = JDITHER_FS; - cinfo.two_pass_quantize = true; - cinfo.desired_number_of_colors = 256; - cinfo.colormap = null; - /* Initialize for no mode change in buffered-image mode. */ - cinfo.enable_1pass_quant = false; - cinfo.enable_external_quant = false; - cinfo.enable_2pass_quant = false; -} - -static void init_source(jpeg_decompress_struct cinfo) { - cinfo.buffer = new byte[INPUT_BUFFER_SIZE]; - cinfo.bytes_in_buffer = 0; - cinfo.bytes_offset = 0; - cinfo.start_of_file = true; -} - -static int jpeg_consume_input (jpeg_decompress_struct cinfo) { - int retcode = JPEG_SUSPENDED; - - /* NB: every possible DSTATE value should be listed in this switch */ - switch (cinfo.global_state) { - case DSTATE_START: - /* Start-of-datastream actions: reset appropriate modules */ - reset_input_controller(cinfo); - /* Initialize application's data source module */ - init_source (cinfo); - cinfo.global_state = DSTATE_INHEADER; - /*FALLTHROUGH*/ - case DSTATE_INHEADER: - retcode = consume_input(cinfo); - if (retcode == JPEG_REACHED_SOS) { /* Found SOS, prepare to decompress */ - /* Set up default parameters based on header data */ - default_decompress_parms(cinfo); - /* Set global state: ready for start_decompress */ - cinfo.global_state = DSTATE_READY; - } - break; - case DSTATE_READY: - /* Can't advance past first SOS until start_decompress is called */ - retcode = JPEG_REACHED_SOS; - break; - case DSTATE_PRELOAD: - case DSTATE_PRESCAN: - case DSTATE_SCANNING: - case DSTATE_RAW_OK: - case DSTATE_BUFIMAGE: - case DSTATE_BUFPOST: - case DSTATE_STOPPING: - retcode = consume_input (cinfo); - break; - default: - error(); -// ERREXIT1(cinfo, JERR_BAD_STATE, cinfo.global_state); - } - return retcode; -} - - -static void jpeg_abort (jpeg_decompress_struct cinfo) { -// int pool; -// -// /* Releasing pools in reverse order might help avoid fragmentation -// * with some (brain-damaged) malloc libraries. -// */ -// for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) { -// (*cinfo.mem.free_pool) (cinfo, pool); -// } - - /* Reset overall state for possible reuse of object */ - if (cinfo.is_decompressor) { - cinfo.global_state = DSTATE_START; - /* Try to keep application from accessing now-deleted marker list. - * A bit kludgy to do it here, but this is the most central place. - */ -// ((j_decompress_ptr) cinfo).marker_list = null; - } else { - cinfo.global_state = CSTATE_START; - } -} - - -static boolean isFileFormat(LEDataInputStream stream) { - try { - byte[] buffer = new byte[2]; - stream.read(buffer); - stream.unread(buffer); - return (buffer[0] & 0xFF) == 0xFF && (buffer[1] & 0xFF) == M_SOI; - } catch (Exception e) { - return false; - } -} - -static ImageData[] loadFromByteStream(InputStream inputStream, ImageLoader loader) { - jpeg_decompress_struct cinfo = new jpeg_decompress_struct(); - cinfo.inputStream = inputStream; - jpeg_create_decompress(cinfo); - jpeg_read_header(cinfo, true); - cinfo.buffered_image = cinfo.progressive_mode && loader.hasListeners(); - jpeg_start_decompress(cinfo); - PaletteData palette = null; - switch (cinfo.out_color_space) { - case JCS_RGB: - palette = new PaletteData(0xFF, 0xFF00, 0xFF0000); - break; - case JCS_GRAYSCALE: - RGB[] colors = new RGB[256]; - for (int i = 0; i < colors.length; i++) { - colors[i] = new RGB(i, i, i); - } - palette = new PaletteData(colors); - break; - default: - error(); - } - int scanlinePad = 4; - int row_stride = (((cinfo.output_width * cinfo.out_color_components * 8 + 7) / 8) + (scanlinePad - 1)) / scanlinePad * scanlinePad; - byte[][] buffer = new byte[1][row_stride]; - byte[] data = new byte[row_stride * cinfo.output_height]; - ImageData imageData = ImageData.internal_new( - cinfo.output_width, cinfo.output_height, palette.isDirect ? 24 : 8, palette, scanlinePad, data, - 0, null, null, -1, -1, SWT.IMAGE_JPEG, 0, 0, 0, 0); - if (cinfo.buffered_image) { - boolean done; - do { - int incrementCount = cinfo.input_scan_number - 1; - jpeg_start_output(cinfo, cinfo.input_scan_number); - while (cinfo.output_scanline < cinfo.output_height) { - int offset = row_stride * cinfo.output_scanline; - jpeg_read_scanlines(cinfo, buffer, 1); - System.arraycopy(buffer[0], 0, data, offset, row_stride); - } - jpeg_finish_output(cinfo); - loader.notifyListeners(new ImageLoaderEvent(loader, (ImageData)imageData.clone(), incrementCount, done = jpeg_input_complete(cinfo))); - } while (!done); - } else { - while (cinfo.output_scanline < cinfo.output_height) { - int offset = row_stride * cinfo.output_scanline; - jpeg_read_scanlines(cinfo, buffer, 1); - System.arraycopy(buffer[0], 0, data, offset, row_stride); - } - } - jpeg_finish_decompress(cinfo); - jpeg_destroy_decompress(cinfo); - return new ImageData[]{imageData}; -} - -} |