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[project @ 2004-04-03 11:49:48 by rjw] 

GIF file reading

svn path=/import/netsurf/; revision=710
This commit is contained in:
Richard Wilson 2004-04-03 11:49:48 +00:00
parent 7872dc57fd
commit ad07b6e656
1 changed files with 81 additions and 0 deletions
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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2004 Richard Wilson <not_ginger_matt@sourceforge.net>
*/
#ifndef _NETSURF_RISCOS_GIFREAD_H_
#define _NETSURF_RISCOS_GIFREAD_H_
#include "oslib/osspriteop.h"
/* Error return values
*/
#define GIF_INSUFFICIENT_DATA -1
#define GIF_DATA_ERROR -2
#define GIF_INSUFFICIENT_MEMORY -3
#define GIF_INSUFFICIENT_FRAME_DATA -4
#define GIF_FRAME_DATA_ERROR -5
/* Colour map size constant. Because we don't want to allocate
memory each time we decode a frame we get enough so all frames
will fit in there.
*/
#define GIF_MAX_COLOURS 256
/* Maximum LZW bits available
*/
#define GIF_MAX_LZW 12
/* A simple hold-all for our GIF data
*/
struct gif_animation {
/* Encoded GIF data
*/
unsigned char *gif_data;
unsigned int buffer_position;
unsigned int buffer_size;
/* Progressive decoding data
*/
unsigned int global_colours;
unsigned int frame_holders;
unsigned int colour_table_size;
unsigned int *frame_pointers;
/* Animation data
*/
unsigned int current_frame;
unsigned int decoded_frame;
unsigned int loop_count;
unsigned int *frame_delays;
/* Decoded GIF data
*/
unsigned int width;
unsigned int height;
unsigned int frame_count;
unsigned int frame_count_partial;
unsigned int background_colour;
unsigned int aspect_ratio;
unsigned int *global_colour_table;
unsigned int *local_colour_table;
/* Decoded frame data
*/
unsigned int frame_offset_x;
unsigned int frame_offset_y;
unsigned int frame_width;
unsigned int frame_height;
unsigned int background_action;
osspriteop_header *frame_image;
};
/* Function declarations
*/
int gif_initialise(struct gif_animation *gif);
int gif_decode_frame(struct gif_animation *gif, int frame);
void gif_finalise(struct gif_animation *gif);
#endif