mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-24 15:29:45 +03:00
78 lines
3.0 KiB
C
78 lines
3.0 KiB
C
/*
|
|
* This file is part of NetSurf, http://netsurf-browser.org/
|
|
* Licensed under the GNU General Public License,
|
|
* http://www.opensource.org/licenses/gpl-license
|
|
* Copyright 2004 Richard Wilson <not_ginger_matt@users.sourceforge.net>
|
|
*/
|
|
|
|
/** \file
|
|
* Progressive animated GIF file decoding (interface).
|
|
*/
|
|
|
|
#ifndef _NETSURF_IMAGE_GIFREAD_H_
|
|
#define _NETSURF_IMAGE_GIFREAD_H_
|
|
|
|
#include <stdbool.h>
|
|
#include "netsurf/image/bitmap.h"
|
|
|
|
/* Error return values
|
|
*/
|
|
#define GIF_INSUFFICIENT_FRAME_DATA -1
|
|
#define GIF_FRAME_DATA_ERROR -2
|
|
#define GIF_INSUFFICIENT_DATA -3
|
|
#define GIF_DATA_ERROR -4
|
|
#define GIF_INSUFFICIENT_MEMORY -5
|
|
|
|
/* Maximum colour table size
|
|
*/
|
|
#define GIF_MAX_COLOURS 256
|
|
|
|
/* Maximum LZW bits available
|
|
*/
|
|
#define GIF_MAX_LZW 12
|
|
|
|
/* The GIF frame data
|
|
*/
|
|
typedef struct gif_frame {
|
|
unsigned int frame_pointer; /**< offset (in bytes) to the GIF frame data */
|
|
unsigned int frame_delay; /**< delay (in cs) before animating the frame */
|
|
bool virgin; /**< whether the frame has previously been used */
|
|
bool opaque; /**< whether the frame is totally opaque */
|
|
bool redraw_required; /**< whether a forcable screen redraw is required */
|
|
unsigned int redraw_x; /**< x co-ordinate of redraw rectangle */
|
|
unsigned int redraw_y; /**< y co-ordinate of redraw rectangle */
|
|
unsigned int redraw_width; /**< width of redraw rectangle */
|
|
unsigned int redraw_height; /**< height of redraw rectangle */
|
|
} gif_frame;
|
|
|
|
/* The GIF animation data
|
|
*/
|
|
typedef struct gif_animation {
|
|
unsigned char *gif_data; /**< pointer to GIF data */
|
|
unsigned int buffer_position; /**< current index into GIF data */
|
|
unsigned int buffer_size; /**< total number of bytes of GIF data available */
|
|
unsigned int frame_holders; /**< current number of frame holders */
|
|
int decoded_frame; /**< current frame decoded to bitmap */
|
|
int loop_count; /**< number of times to loop animation */
|
|
gif_frame *frames; /**< decoded frames */
|
|
unsigned int width; /**< width of GIF (may increase during decoding) */
|
|
unsigned int height; /**< heigth of GIF (may increase during decoding) */
|
|
unsigned int frame_count; /**< number of frames decoded */
|
|
unsigned int frame_count_partial; /**< number of frames partially decoded */
|
|
unsigned int background_colour; /**< image background colour */
|
|
unsigned int aspect_ratio; /**< image aspect ratio (ignored) */
|
|
unsigned int colour_table_size; /**< size of colour table (in entries) */
|
|
bool global_colours; /**< whether the GIF has a global colour table */
|
|
unsigned int *global_colour_table; /**< global colour table */
|
|
unsigned int *local_colour_table; /**< local colour table */
|
|
int dirty_frame; /**< the current dirty frame, or -1 for none */
|
|
struct bitmap *frame_image; /**< currently decoded image */
|
|
int current_error; /**< current error type, or 0 for none*/
|
|
} gif_animation;
|
|
|
|
int gif_initialise(struct gif_animation *gif);
|
|
int gif_decode_frame(struct gif_animation *gif, unsigned int frame);
|
|
void gif_finalise(struct gif_animation *gif);
|
|
|
|
#endif
|