diff options
Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/PngPlteChunk.java')
| -rwxr-xr-x | bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/PngPlteChunk.java | 172 |
1 files changed, 86 insertions, 86 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/PngPlteChunk.java b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/PngPlteChunk.java index 752a39a076..c78f96c05c 100755 --- a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/PngPlteChunk.java +++ b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/PngPlteChunk.java @@ -1,90 +1,90 @@ -package org.eclipse.swt.internal.image;
-
-/*
+package org.eclipse.swt.internal.image; + +/* * Copyright (c) 2000, 2002 IBM Corp. All rights reserved. * This file is made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/cpl-v10.html
- */
-
-import org.eclipse.swt.*;
-import org.eclipse.swt.graphics.*;
-import org.eclipse.swt.internal.Compatibility;
-
-class PngPlteChunk extends PngChunk {
-
-PngPlteChunk(byte[] reference){
- super(reference);
-}
-
-/**
- * Get the number of colors in this palette.
- */
-int getPaletteSize() {
- return getLength() / 3;
-}
-
-/**
- * Get a PaletteData object representing the colors
- * stored in this PLTE chunk.
- * The result should be cached as the PLTE chunk
- * does not store the palette data created.
- */
-PaletteData getPaletteData() {
- RGB[] rgbs = new RGB[getPaletteSize()];
-// int start = DATA_OFFSET;
-// int end = DATA_OFFSET + getLength();
- for (int i = 0; i < rgbs.length; i++) {
- int offset = DATA_OFFSET + (i * 3);
- int red = reference[offset] & 0xFF;
- int green = reference[offset + 1] & 0xFF;
- int blue = reference[offset + 2] & 0xFF;
- rgbs[i] = new RGB(red, green, blue);
- }
- return new PaletteData(rgbs);
-}
-
-/**
- * Answer whether the chunk is a valid PLTE chunk.
- */
-void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
- // A PLTE chunk is invalid if no IHDR has been read or if any PLTE,
- // IDAT, or IEND chunk has been read.
- if (!readState.readIHDR
- || readState.readPLTE
- || readState.readTRNS
- || readState.readBKGD
- || readState.readIDAT
- || readState.readIEND)
- {
- SWT.error(SWT.ERROR_INVALID_IMAGE);
- } else {
- readState.readPLTE = true;
- }
-
- super.validate(readState, headerChunk);
-
- // Palettes cannot be included in grayscale images.
- if (!headerChunk.getCanHavePalette()) SWT.error(SWT.ERROR_INVALID_IMAGE);
-
- // Palette chunks' data fields must be event multiples
- // of 3. Each 3-byte group represents an RGB value.
- if (getLength() % 3 != 0) SWT.error(SWT.ERROR_INVALID_IMAGE);
-
- // Palettes cannot have more entries than 2^bitDepth
- // where bitDepth is the bit depth of the image given
- // in the IHDR chunk.
- if (Compatibility.pow2(headerChunk.getBitDepth()) < getPaletteSize()) {
- SWT.error(SWT.ERROR_INVALID_IMAGE);
- }
-
- // Palettes cannot have more than 256 entries.
- if (256 < getPaletteSize()) SWT.error(SWT.ERROR_INVALID_IMAGE);
-}
-
-void contributeToString(StringBuffer buffer) {
- buffer.append("\n\tPalette size:");
- buffer.append(getPaletteSize());
-}
-
+ * http://www.eclipse.org/legal/cpl-v10.html + */ + +import org.eclipse.swt.*; +import org.eclipse.swt.graphics.*; +import org.eclipse.swt.internal.Compatibility; + +class PngPlteChunk extends PngChunk { + +PngPlteChunk(byte[] reference){ + super(reference); +} + +/** + * Get the number of colors in this palette. + */ +int getPaletteSize() { + return getLength() / 3; +} + +/** + * Get a PaletteData object representing the colors + * stored in this PLTE chunk. + * The result should be cached as the PLTE chunk + * does not store the palette data created. + */ +PaletteData getPaletteData() { + RGB[] rgbs = new RGB[getPaletteSize()]; +// int start = DATA_OFFSET; +// int end = DATA_OFFSET + getLength(); + for (int i = 0; i < rgbs.length; i++) { + int offset = DATA_OFFSET + (i * 3); + int red = reference[offset] & 0xFF; + int green = reference[offset + 1] & 0xFF; + int blue = reference[offset + 2] & 0xFF; + rgbs[i] = new RGB(red, green, blue); + } + return new PaletteData(rgbs); +} + +/** + * Answer whether the chunk is a valid PLTE chunk. + */ +void validate(PngFileReadState readState, PngIhdrChunk headerChunk) { + // A PLTE chunk is invalid if no IHDR has been read or if any PLTE, + // IDAT, or IEND chunk has been read. + if (!readState.readIHDR + || readState.readPLTE + || readState.readTRNS + || readState.readBKGD + || readState.readIDAT + || readState.readIEND) + { + SWT.error(SWT.ERROR_INVALID_IMAGE); + } else { + readState.readPLTE = true; + } + + super.validate(readState, headerChunk); + + // Palettes cannot be included in grayscale images. + if (!headerChunk.getCanHavePalette()) SWT.error(SWT.ERROR_INVALID_IMAGE); + + // Palette chunks' data fields must be event multiples + // of 3. Each 3-byte group represents an RGB value. + if (getLength() % 3 != 0) SWT.error(SWT.ERROR_INVALID_IMAGE); + + // Palettes cannot have more entries than 2^bitDepth + // where bitDepth is the bit depth of the image given + // in the IHDR chunk. + if (Compatibility.pow2(headerChunk.getBitDepth()) < getPaletteSize()) { + SWT.error(SWT.ERROR_INVALID_IMAGE); + } + + // Palettes cannot have more than 256 entries. + if (256 < getPaletteSize()) SWT.error(SWT.ERROR_INVALID_IMAGE); +} + +void contributeToString(StringBuffer buffer) { + buffer.append("\n\tPalette size:"); + buffer.append(getPaletteSize()); +} + } |