mirror of
https://github.com/netsurf-browser/netsurf
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85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
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* Copyright 2006 Richard Wilson <info@tinct.net>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 "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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