1 files changed, 75 insertions, 0 deletions
diff --git a/image/gifread.h b/image/gifread.h
new file mode 100644
index 000000000..a19409898
--- /dev/null
+++ b/image/gifread.h
@@ -0,0 +1,75 @@
+/*
+ * 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@users.sourceforge.net>
+ */
+
+/** \file
+ * Progressive animated GIF file decoding (interface).
+ */
+
+#ifndef _NETSURF_IMAGE_GIFREAD_H_
+#define _NETSURF_IMAGE_GIFREAD_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 */
+	unsigned 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 */
+	bool dirty_frame;			/**< whether the curent frame needs erasing on animation */
+	struct bitmap *frame_image;		/**< currently decoded image */
+} 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