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/*******************************************************************************
* Copyright (c) 2000, 2005 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
*******************************************************************************/
#ifndef __NG_IMAGEDATA_H
#define __NG_IMAGEDATA_H
/**
* Type ng_bitmap_image_t (C version of SWT ImageData)
*
* Unlike ImageData, ng_bitmap_image_t and all its api are 'internal'.
* The api marked 'public' is in the sense that it can be used
* by the rest of the native graphic library.
*/
#include "NgCommon.h"
typedef struct ng_bitmap_image_t ng_bitmap_image_t;
typedef struct {
UBYTE1 blue;
UBYTE1 green;
UBYTE1 red;
} ng_color_map_entry_t;
/* ImageData in SWT expects RGB not BGR */
enum { RedOffset=0, GreenOffset=1, BlueOffset=2 };
struct ng_bitmap_image_t {
/* Width in bytes of each row */
UBYTE4 row_width;
/* Number of bits per pixel (depth) 1, 2, 4, 8, 16 or 24 */
UBYTE4 bit_count;
UBYTE4 image_width;
UBYTE4 image_height;
/* image data
* 24-bit images, 3 bytes per pixel representing RGB values
* 32 bit images, 4 bytes per pixel representing RGB values + one wasted byte
* 16 bit images, 2 bytes per pixel
* rest (1, 2, 4, 8): index into color map
*/
UBYTE1 *image_data;
/* alpha data (either NULL or of size image_width*image_height) */
UBYTE1 *alpha_data;
/* transparent pixel - default is -1 which means no transparent pixel */
BYTE4 transparent_pixel;
/* number of entries in color map */
UBYTE4 color_count;
ng_color_map_entry_t *color_map;
};
/************************************************
* Public API ng_bitmap_image_t
************************************************/
/**
* Init an image
*/
void NgBitmapImageInit (ng_bitmap_image_t *);
/**
* Dispose the resources allocated by the image.
*/
void NgBitmapImageFree (ng_bitmap_image_t *);
/**
* Access start of image data
* return: a pointer to an array of UBYTE1 of size image_row * image_width
* signature: UBYTE1 *NgBitmapImageImageData (ng_bitmap_image_t *image)
*/
#define NgBitmapImageImageData(image) ((image)->image_data)
/**
* signature: UBYTE4 NgBitmapImageWidth (ng_bitmap_image_t *image)
*/
#define NgBitmapImageWidth(image) ((image)->image_width)
/**
* signature: UBYTE4 NgBitmapImageHeight (ng_bitmap_image_t *image)
*/
#define NgBitmapImageHeight(image) ((image)->image_height)
/**
* signature: UBYTE4 NgBitmapImageBitCount (ng_bitmap_image_t *image)
*/
#define NgBitmapImageBitCount(image) ((image)->bit_count)
/**
* signature: UBYTE4 NgBitmapImageColorCount (ng_bitmap_image_t *image)
*/
#define NgBitmapImageColorCount(image) ((image)->color_count)
/**
* Access a row of the image
* row: a value which must be between 0 and image_height-1
* return: a pointer to the desired row, which is an array of size row_width
* signature: UBYTE1 *NgBitmapImageGetRow (ng_bitmap_image_t *image, UBYTE4 row)
*/
#define NgBitmapImageGetRow(image, row) (&image->image_data[row * image->row_width])
/**
* signature: UBYTE4 NgBitmapImageBytesPerRow (ng_bitmap_image_t *image)
*/
#define NgBitmapImageBytesPerRow(image) ((image)->row_width)
/**
* Retrieve an entry from the color map
* index: a value which must be between 0 and color_count-1
*/
ng_color_map_entry_t *NgBitmapImageColorMap (ng_bitmap_image_t *, UBYTE4 index);
/**
* Get the value of the transparent pixel
* signature: BYTE4 NgBitmapImageGetTransparent (ng_bitmap_image_t *image)
*/
#define NgBitmapImageGetTransparent(image) ((image)->transparent_pixel)
/**
* Get the alpha data
* signature: UBYTE1 *NgBitmapImageGetAlpha (ng_bitmap_image_t* image)
*/
#define NgBitmapImageGetAlpha(image) ((image)->alpha_data)
void NgBitmapImageBlitDirectToDirect(
UBYTE1 *srcData, BYTE4 srcStride,
BYTE4 srcWidth, BYTE4 srcHeight,
UBYTE1 *destData, BYTE4 destDepth, BYTE4 destStride, BYTE4 destOrder,
UBYTE4 destRedMask, UBYTE4 destGreenMask, UBYTE4 destBlueMask);
/* Size of hash table used in NgBitmapImageBlitDirectToPalette */
#define RGBIndexTableSize 103
typedef struct {
UBYTE1 isSet;
UBYTE1 blue;
UBYTE1 green;
UBYTE1 red;
UBYTE1 index;
} ng_palette_bucket_t;
void NgBitmapImageBlitDirectToPalette(
UBYTE1 *srcData, BYTE4 srcStride,
BYTE4 srcWidth, BYTE4 srcHeight,
UBYTE1 *destData, BYTE4 destDepth, BYTE4 destStride, BYTE4 destOrder,
UBYTE1 *destColors, int destNumColors);
/************************************************
* Private API ng_bitmap_image_t
************************************************/
/* Number of bytes to round each row to */
#define RowRounding 4
void NgBitmapImageInitialize (ng_bitmap_image_t *);
void NgBitmapImageClearData (ng_bitmap_image_t *);
void NgBitmapImageSetSize(ng_bitmap_image_t *,
UBYTE4 color_count,
UBYTE4 bits,
UBYTE4 width,
UBYTE4 height);
#endif /* NG_IMAGEDATA_H */
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