74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2006 Richard Wilson <info@tinct.net>
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*/
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/** \file
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* BMP file decoding (interface).
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*/
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#ifndef _NETSURF_IMAGE_BMPREAD_H_
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#define _NETSURF_IMAGE_BMPREAD_H_
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#include <stdbool.h>
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#include "netsurf/image/bitmap.h"
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/* error return values */
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typedef enum {
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BMP_OK = 0,
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BMP_INSUFFICIENT_MEMORY = 1,
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BMP_INSUFFICIENT_DATA = 2,
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BMP_DATA_ERROR = 3
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} bmp_result;
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/* encoding types */
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typedef enum {
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BMP_ENCODING_RGB = 0,
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BMP_ENCODING_RLE8 = 1,
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BMP_ENCODING_RLE4 = 2,
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BMP_ENCODING_BITFIELDS = 3
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} bmp_encoding;
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struct bmp_image {
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unsigned char *bmp_data; /** pointer to BMP data */
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unsigned int buffer_size; /** total number of bytes of BMP data available */
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unsigned int width; /** width of BMP (valid after _analyse) */
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unsigned int height; /** heigth of BMP (valid after _analyse) */
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bmp_encoding encoding; /** pixel encoding type */
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unsigned int bitmap_offset; /** offset of bitmap data */
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unsigned int bpp; /** bits per pixel */
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unsigned int colours; /** number of colours */
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unsigned int *colour_table; /** colour table */
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bool reversed; /** scanlines are top to bottom */
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bool decoded; /** whether the image has been decoded */
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bool ico; /** image is part of an ICO, mask follows */
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unsigned int mask[4]; /** four bitwise mask */
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int shift[4]; /** four bitwise shifts */
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struct bitmap *bitmap; /** decoded image */
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};
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struct ico_image {
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struct bmp_image bmp;
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struct ico_image *next;
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};
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struct ico_collection {
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unsigned char *ico_data; /** pointer to ICO data */
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unsigned int buffer_size; /** total number of bytes of ICO data available */
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unsigned int width; /** width of largest BMP */
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unsigned int height; /** heigth of largest BMP */
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struct ico_image *first;
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};
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bmp_result bmp_analyse(struct bmp_image *bmp);
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bmp_result bmp_decode(struct bmp_image *bmp);
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void bmp_finalise(struct bmp_image *bmp);
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bmp_result ico_analyse(struct ico_collection *ico);
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struct bmp_image *ico_find(struct ico_collection *ico, int width, int height);
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void ico_finalise(struct ico_collection *ico);
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#endif
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