mirror of
https://github.com/netsurf-browser/netsurf
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6807b4208a
NetSurf includes are now done with ""s and other system includes with <>s as C intended. The scandeps tool has been updated to only look for ""ed includes, and to verify that the files exist in the tree before adding them to the dependency lines. The depend rule has therefore been augmented to make sure the autogenerated files are built before it is run. This is untested under self-hosted RISC OS builds. All else tested and works. svn path=/trunk/netsurf/; revision=3307
78 lines
3.0 KiB
C
78 lines
3.0 KiB
C
/*
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* This file is part of NetSurf, http://netsurf-browser.org/
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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 2004 Richard Wilson <not_ginger_matt@users.sourceforge.net>
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*/
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/** \file
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* Progressive animated GIF file decoding (interface).
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*/
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#ifndef _NETSURF_IMAGE_GIFREAD_H_
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#define _NETSURF_IMAGE_GIFREAD_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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*/
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#define GIF_INSUFFICIENT_FRAME_DATA -1
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#define GIF_FRAME_DATA_ERROR -2
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#define GIF_INSUFFICIENT_DATA -3
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#define GIF_DATA_ERROR -4
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#define GIF_INSUFFICIENT_MEMORY -5
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/* Maximum colour table size
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*/
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#define GIF_MAX_COLOURS 256
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/* Maximum LZW bits available
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*/
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#define GIF_MAX_LZW 12
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/* The GIF frame data
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*/
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typedef struct gif_frame {
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unsigned int frame_pointer; /**< offset (in bytes) to the GIF frame data */
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unsigned int frame_delay; /**< delay (in cs) before animating the frame */
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bool virgin; /**< whether the frame has previously been used */
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bool opaque; /**< whether the frame is totally opaque */
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bool redraw_required; /**< whether a forcable screen redraw is required */
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unsigned int redraw_x; /**< x co-ordinate of redraw rectangle */
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unsigned int redraw_y; /**< y co-ordinate of redraw rectangle */
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unsigned int redraw_width; /**< width of redraw rectangle */
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unsigned int redraw_height; /**< height of redraw rectangle */
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} gif_frame;
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/* The GIF animation data
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*/
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typedef struct gif_animation {
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unsigned char *gif_data; /**< pointer to GIF data */
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unsigned int buffer_position; /**< current index into GIF data */
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unsigned int buffer_size; /**< total number of bytes of GIF data available */
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unsigned int frame_holders; /**< current number of frame holders */
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int decoded_frame; /**< current frame decoded to bitmap */
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int loop_count; /**< number of times to loop animation */
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gif_frame *frames; /**< decoded frames */
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unsigned int width; /**< width of GIF (may increase during decoding) */
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unsigned int height; /**< heigth of GIF (may increase during decoding) */
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unsigned int frame_count; /**< number of frames decoded */
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unsigned int frame_count_partial; /**< number of frames partially decoded */
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unsigned int background_colour; /**< image background colour */
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unsigned int aspect_ratio; /**< image aspect ratio (ignored) */
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unsigned int colour_table_size; /**< size of colour table (in entries) */
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bool global_colours; /**< whether the GIF has a global colour table */
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unsigned int *global_colour_table; /**< global colour table */
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unsigned int *local_colour_table; /**< local colour table */
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int dirty_frame; /**< the current dirty frame, or -1 for none */
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struct bitmap *frame_image; /**< currently decoded image */
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int current_error; /**< current error type, or 0 for none*/
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} gif_animation;
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int gif_initialise(struct gif_animation *gif);
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int gif_decode_frame(struct gif_animation *gif, unsigned int frame);
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void gif_finalise(struct gif_animation *gif);
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#endif
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