d97cdbdf53
2008-06-21 Johan Dahlin <jdahlin@async.com.br> * *.[ch]: Include "config.h" instead of <config.h> Command used: find -name \*.[ch]|xargs perl -p -i -e 's/^#include <config.h>/#include "config.h"/g' Rubberstamped by Mitch and Tim svn path=/trunk/; revision=20669
1695 lines
52 KiB
C
1695 lines
52 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
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/* GdkPixbuf library - GIF image loader
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*
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* Copyright (C) 1999 Mark Crichton
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Authors: Jonathan Blandford <jrb@redhat.com>
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* Adapted from the gimp gif filter written by Adam Moss <adam@gimp.org>
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* Gimp work based on earlier work.
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* Permission to relicense under the LGPL obtained.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* This loader is very hairy code.
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*
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* The main loop was not designed for incremental loading, so when it was hacked
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* in it got a bit messy. Basicly, every function is written to expect a failed
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* read_gif, and lets you call it again assuming that the bytes are there.
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*
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* Return vals.
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* Unless otherwise specified, these are the return vals for most functions:
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*
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* 0 -> success
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* -1 -> more bytes needed.
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* -2 -> failure; abort the load
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* -3 -> control needs to be passed back to the main loop
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* \_ (most of the time returning 0 will get this, but not always)
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*
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* >1 -> for functions that get a guchar, the char will be returned.
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*
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* -jrb (11/03/1999)
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*/
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/*
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* If you have any images that crash this code, please, please let me know and
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* send them to me.
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* <jrb@redhat.com>
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "gdk-pixbuf-private.h"
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#include "gdk-pixbuf-io.h"
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#include "io-gif-animation.h"
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#undef DUMP_IMAGE_DETAILS
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#undef IO_GIFDEBUG
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#define MAXCOLORMAPSIZE 256
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#define MAX_LZW_BITS 12
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#define INTERLACE 0x40
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#define LOCALCOLORMAP 0x80
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#define BitSet(byte, bit) (((byte) & (bit)) == (bit))
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#define LM_to_uint(a,b) (((b)<<8)|(a))
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typedef unsigned char CMap[3][MAXCOLORMAPSIZE];
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/* Possible states we can be in. */
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enum {
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GIF_START,
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GIF_GET_COLORMAP,
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GIF_GET_NEXT_STEP,
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GIF_GET_FRAME_INFO,
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GIF_GET_EXTENSION,
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GIF_GET_COLORMAP2,
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GIF_PREPARE_LZW,
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GIF_LZW_FILL_BUFFER,
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GIF_LZW_CLEAR_CODE,
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GIF_GET_LZW,
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GIF_DONE
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};
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typedef struct _Gif89 Gif89;
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struct _Gif89
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{
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int transparent;
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int delay_time;
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int input_flag;
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int disposal;
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};
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typedef struct _GifContext GifContext;
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struct _GifContext
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{
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int state; /* really only relevant for progressive loading */
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unsigned int width;
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unsigned int height;
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gboolean has_global_cmap;
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CMap global_color_map;
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gint global_colormap_size;
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unsigned int global_bit_pixel;
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unsigned int global_color_resolution;
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unsigned int background_index;
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gboolean stop_after_first_frame;
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gboolean frame_cmap_active;
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CMap frame_color_map;
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gint frame_colormap_size;
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unsigned int frame_bit_pixel;
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unsigned int aspect_ratio;
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GdkPixbufGifAnim *animation;
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GdkPixbufFrame *frame;
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Gif89 gif89;
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/* stuff per frame. */
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int frame_len;
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int frame_height;
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int frame_interlace;
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int x_offset;
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int y_offset;
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/* Static read only */
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FILE *file;
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/* progressive read, only. */
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GdkPixbufModulePreparedFunc prepare_func;
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GdkPixbufModuleUpdatedFunc update_func;
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gpointer user_data;
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guchar *buf;
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guint ptr;
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guint size;
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guint amount_needed;
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/* extension context */
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guchar extension_label;
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guchar extension_flag;
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gboolean in_loop_extension;
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/* get block context */
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guchar block_count;
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guchar block_buf[280];
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gint block_ptr;
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int old_state; /* used by lzw_fill buffer */
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/* get_code context */
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int code_curbit;
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int code_lastbit;
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int code_done;
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int code_last_byte;
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int lzw_code_pending;
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/* lzw context */
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gint lzw_fresh;
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gint lzw_code_size;
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guchar lzw_set_code_size;
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gint lzw_max_code;
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gint lzw_max_code_size;
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gint lzw_firstcode;
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gint lzw_oldcode;
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gint lzw_clear_code;
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gint lzw_end_code;
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gint *lzw_sp;
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gint lzw_table[2][(1 << MAX_LZW_BITS)];
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gint lzw_stack[(1 << (MAX_LZW_BITS)) * 2 + 1];
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/* painting context */
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gint draw_xpos;
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gint draw_ypos;
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gint draw_pass;
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/* error pointer */
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GError **error;
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};
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static int GetDataBlock (GifContext *, unsigned char *);
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#ifdef IO_GIFDEBUG
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static int count = 0;
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#endif
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/* Returns TRUE if read is OK,
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* FALSE if more memory is needed. */
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static gboolean
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gif_read (GifContext *context, guchar *buffer, size_t len)
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{
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gboolean retval;
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#ifdef IO_GIFDEBUG
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gint i;
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#endif
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if (context->file) {
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#ifdef IO_GIFDEBUG
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count += len;
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g_print ("Fsize :%d\tcount :%d\t", len, count);
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#endif
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retval = (fread(buffer, len, 1, context->file) != 0);
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if (!retval && ferror (context->file)) {
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gint save_errno = errno;
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g_set_error (context->error,
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G_FILE_ERROR,
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g_file_error_from_errno (save_errno),
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_("Failure reading GIF: %s"),
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strerror (save_errno));
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}
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#ifdef IO_GIFDEBUG
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if (len < 100) {
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for (i = 0; i < len; i++)
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g_print ("%d ", buffer[i]);
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}
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g_print ("\n");
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#endif
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return retval;
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} else {
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#ifdef IO_GIFDEBUG
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/* g_print ("\tlooking for %d bytes. size == %d, ptr == %d\n", len, context->size, context->ptr); */
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#endif
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if ((context->size - context->ptr) >= len) {
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#ifdef IO_GIFDEBUG
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count += len;
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#endif
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memcpy (buffer, context->buf + context->ptr, len);
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context->ptr += len;
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context->amount_needed = 0;
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#ifdef IO_GIFDEBUG
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g_print ("Psize :%d\tcount :%d\t", len, count);
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if (len < 100) {
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for (i = 0; i < len; i++)
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g_print ("%d ", buffer[i]);
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}
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g_print ("\n");
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#endif
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return TRUE;
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}
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context->amount_needed = len - (context->size - context->ptr);
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}
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return FALSE;
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}
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/* Changes the stage to be GIF_GET_COLORMAP */
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static void
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gif_set_get_colormap (GifContext *context)
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{
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context->global_colormap_size = 0;
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context->state = GIF_GET_COLORMAP;
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}
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static void
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gif_set_get_colormap2 (GifContext *context)
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{
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context->frame_colormap_size = 0;
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context->state = GIF_GET_COLORMAP2;
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}
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static gint
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gif_get_colormap (GifContext *context)
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{
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unsigned char rgb[3];
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while (context->global_colormap_size < context->global_bit_pixel) {
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if (!gif_read (context, rgb, sizeof (rgb))) {
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return -1;
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}
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context->global_color_map[0][context->global_colormap_size] = rgb[0];
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context->global_color_map[1][context->global_colormap_size] = rgb[1];
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context->global_color_map[2][context->global_colormap_size] = rgb[2];
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if (context->global_colormap_size == context->background_index) {
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context->animation->bg_red = rgb[0];
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context->animation->bg_green = rgb[1];
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context->animation->bg_blue = rgb[2];
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}
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context->global_colormap_size ++;
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}
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return 0;
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}
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static gint
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gif_get_colormap2 (GifContext *context)
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{
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unsigned char rgb[3];
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while (context->frame_colormap_size < context->frame_bit_pixel) {
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if (!gif_read (context, rgb, sizeof (rgb))) {
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return -1;
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}
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context->frame_color_map[0][context->frame_colormap_size] = rgb[0];
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context->frame_color_map[1][context->frame_colormap_size] = rgb[1];
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context->frame_color_map[2][context->frame_colormap_size] = rgb[2];
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context->frame_colormap_size ++;
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}
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return 0;
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}
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/*
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* in order for this function to work, we need to perform some black magic.
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* We want to return -1 to let the calling function know, as before, that it needs
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* more bytes. If we return 0, we were able to successfully read all block->count bytes.
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* Problem is, we don't want to reread block_count every time, so we check to see if
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* context->block_count is 0 before we read in the function.
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*
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* As a result, context->block_count MUST be 0 the first time the get_data_block is called
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* within a context, and cannot be 0 the second time it's called.
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*/
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static int
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get_data_block (GifContext *context,
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unsigned char *buf,
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gint *empty_block)
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{
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if (context->block_count == 0) {
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if (!gif_read (context, &context->block_count, 1)) {
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return -1;
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}
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}
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if (context->block_count == 0)
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if (empty_block) {
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*empty_block = TRUE;
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return 0;
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}
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if (!gif_read (context, buf, context->block_count)) {
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return -1;
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}
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return 0;
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}
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static void
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gif_set_get_extension (GifContext *context)
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{
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context->state = GIF_GET_EXTENSION;
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context->extension_flag = TRUE;
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context->extension_label = 0;
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context->block_count = 0;
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context->block_ptr = 0;
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}
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static int
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gif_get_extension (GifContext *context)
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{
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gint retval;
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gint empty_block = FALSE;
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if (context->extension_flag) {
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if (context->extension_label == 0) {
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/* I guess bad things can happen if we have an extension of 0 )-: */
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/* I should look into this sometime */
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if (!gif_read (context, & context->extension_label , 1)) {
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return -1;
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}
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}
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switch (context->extension_label) {
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case 0xf9: /* Graphic Control Extension */
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retval = get_data_block (context, (unsigned char *) context->block_buf, NULL);
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if (retval != 0)
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return retval;
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if (context->frame == NULL) {
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/* I only want to set the transparency if I haven't
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* created the frame yet.
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*/
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context->gif89.disposal = (context->block_buf[0] >> 2) & 0x7;
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context->gif89.input_flag = (context->block_buf[0] >> 1) & 0x1;
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context->gif89.delay_time = LM_to_uint (context->block_buf[1], context->block_buf[2]);
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if ((context->block_buf[0] & 0x1) != 0) {
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context->gif89.transparent = context->block_buf[3];
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} else {
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context->gif89.transparent = -1;
|
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}
|
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}
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||
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/* Now we've successfully loaded this one, we continue on our way */
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context->block_count = 0;
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context->extension_flag = FALSE;
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break;
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case 0xff: /* application extension */
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if (!context->in_loop_extension) {
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retval = get_data_block (context, (unsigned char *) context->block_buf, NULL);
|
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if (retval != 0)
|
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return retval;
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if (!strncmp (context->block_buf, "NETSCAPE2.0", 11) ||
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!strncmp (context->block_buf, "ANIMEXTS1.0", 11)) {
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context->in_loop_extension = TRUE;
|
||
}
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context->block_count = 0;
|
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}
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if (context->in_loop_extension) {
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do {
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retval = get_data_block (context, (unsigned char *) context->block_buf, &empty_block);
|
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if (retval != 0)
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return retval;
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if (context->block_buf[0] == 0x01) {
|
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context->animation->loop = context->block_buf[1] + (context->block_buf[2] << 8);
|
||
if (context->animation->loop != 0)
|
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context->animation->loop++;
|
||
}
|
||
context->block_count = 0;
|
||
}
|
||
while (!empty_block);
|
||
context->in_loop_extension = FALSE;
|
||
context->extension_flag = FALSE;
|
||
return 0;
|
||
}
|
||
break;
|
||
default:
|
||
/* Unhandled extension */
|
||
break;
|
||
}
|
||
}
|
||
/* read all blocks, until I get an empty block, in case there was an extension I didn't know about. */
|
||
do {
|
||
retval = get_data_block (context, (unsigned char *) context->block_buf, &empty_block);
|
||
if (retval != 0)
|
||
return retval;
|
||
context->block_count = 0;
|
||
} while (!empty_block);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int ZeroDataBlock = FALSE;
|
||
|
||
static int
|
||
GetDataBlock (GifContext *context,
|
||
unsigned char *buf)
|
||
{
|
||
/* unsigned char count; */
|
||
|
||
if (!gif_read (context, &context->block_count, 1)) {
|
||
/*g_message (_("GIF: error in getting DataBlock size\n"));*/
|
||
return -1;
|
||
}
|
||
|
||
ZeroDataBlock = context->block_count == 0;
|
||
|
||
if ((context->block_count != 0) && (!gif_read (context, buf, context->block_count))) {
|
||
/*g_message (_("GIF: error in reading DataBlock\n"));*/
|
||
return -1;
|
||
}
|
||
|
||
return context->block_count;
|
||
}
|
||
|
||
|
||
static void
|
||
gif_set_lzw_fill_buffer (GifContext *context)
|
||
{
|
||
context->block_count = 0;
|
||
context->old_state = context->state;
|
||
context->state = GIF_LZW_FILL_BUFFER;
|
||
}
|
||
|
||
static int
|
||
gif_lzw_fill_buffer (GifContext *context)
|
||
{
|
||
gint retval;
|
||
|
||
if (context->code_done) {
|
||
if (context->code_curbit >= context->code_lastbit) {
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("GIF file was missing some data (perhaps it was truncated somehow?)"));
|
||
|
||
return -2;
|
||
}
|
||
/* Is this supposed to be an error or what? */
|
||
/* g_message ("trying to read more data after we've done stuff\n"); */
|
||
g_set_error (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_FAILED,
|
||
_("Internal error in the GIF loader (%s)"),
|
||
G_STRLOC);
|
||
|
||
return -2;
|
||
}
|
||
|
||
context->block_buf[0] = context->block_buf[context->code_last_byte - 2];
|
||
context->block_buf[1] = context->block_buf[context->code_last_byte - 1];
|
||
|
||
retval = get_data_block (context, &context->block_buf[2], NULL);
|
||
|
||
if (retval == -1)
|
||
return -1;
|
||
|
||
if (context->block_count == 0)
|
||
context->code_done = TRUE;
|
||
|
||
context->code_last_byte = 2 + context->block_count;
|
||
context->code_curbit = (context->code_curbit - context->code_lastbit) + 16;
|
||
context->code_lastbit = (2 + context->block_count) * 8;
|
||
|
||
context->state = context->old_state;
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
get_code (GifContext *context,
|
||
int code_size)
|
||
{
|
||
int i, j, ret;
|
||
|
||
if ((context->code_curbit + code_size) >= context->code_lastbit){
|
||
gif_set_lzw_fill_buffer (context);
|
||
return -3;
|
||
}
|
||
|
||
ret = 0;
|
||
for (i = context->code_curbit, j = 0; j < code_size; ++i, ++j)
|
||
ret |= ((context->block_buf[i / 8] & (1 << (i % 8))) != 0) << j;
|
||
|
||
context->code_curbit += code_size;
|
||
|
||
return ret;
|
||
}
|
||
|
||
|
||
static void
|
||
set_gif_lzw_clear_code (GifContext *context)
|
||
{
|
||
context->state = GIF_LZW_CLEAR_CODE;
|
||
context->lzw_code_pending = -1;
|
||
}
|
||
|
||
static int
|
||
gif_lzw_clear_code (GifContext *context)
|
||
{
|
||
gint code;
|
||
|
||
code = get_code (context, context->lzw_code_size);
|
||
if (code == -3)
|
||
return -0;
|
||
|
||
context->lzw_firstcode = context->lzw_oldcode = code;
|
||
context->lzw_code_pending = code;
|
||
context->state = GIF_GET_LZW;
|
||
return 0;
|
||
}
|
||
|
||
#define CHECK_LZW_SP() G_STMT_START { \
|
||
if ((guchar *)context->lzw_sp >= \
|
||
(guchar *)context->lzw_stack + sizeof (context->lzw_stack)) { \
|
||
g_set_error_literal (context->error, \
|
||
GDK_PIXBUF_ERROR, \
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE, \
|
||
_("Stack overflow")); \
|
||
return -2; \
|
||
} \
|
||
} G_STMT_END
|
||
|
||
static int
|
||
lzw_read_byte (GifContext *context)
|
||
{
|
||
int code, incode;
|
||
gint retval;
|
||
gint my_retval;
|
||
register int i;
|
||
|
||
if (context->lzw_code_pending != -1) {
|
||
retval = context->lzw_code_pending;
|
||
context->lzw_code_pending = -1;
|
||
return retval;
|
||
}
|
||
|
||
if (context->lzw_fresh) {
|
||
context->lzw_fresh = FALSE;
|
||
do {
|
||
retval = get_code (context, context->lzw_code_size);
|
||
if (retval < 0) {
|
||
return retval;
|
||
}
|
||
|
||
context->lzw_firstcode = context->lzw_oldcode = retval;
|
||
} while (context->lzw_firstcode == context->lzw_clear_code);
|
||
return context->lzw_firstcode;
|
||
}
|
||
|
||
if (context->lzw_sp > context->lzw_stack) {
|
||
my_retval = *--(context->lzw_sp);
|
||
return my_retval;
|
||
}
|
||
|
||
while ((code = get_code (context, context->lzw_code_size)) >= 0) {
|
||
if (code == context->lzw_clear_code) {
|
||
for (i = 0; i < context->lzw_clear_code; ++i) {
|
||
context->lzw_table[0][i] = 0;
|
||
context->lzw_table[1][i] = i;
|
||
}
|
||
for (; i < (1 << MAX_LZW_BITS); ++i)
|
||
context->lzw_table[0][i] = context->lzw_table[1][i] = 0;
|
||
context->lzw_code_size = context->lzw_set_code_size + 1;
|
||
context->lzw_max_code_size = 2 * context->lzw_clear_code;
|
||
context->lzw_max_code = context->lzw_clear_code + 2;
|
||
context->lzw_sp = context->lzw_stack;
|
||
|
||
set_gif_lzw_clear_code (context);
|
||
return -3;
|
||
} else if (code == context->lzw_end_code) {
|
||
int count;
|
||
unsigned char buf[260];
|
||
|
||
/* FIXME - we should handle this case */
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_FAILED,
|
||
_("GIF image loader cannot understand this image."));
|
||
return -2;
|
||
|
||
if (ZeroDataBlock) {
|
||
return -2;
|
||
}
|
||
|
||
while ((count = GetDataBlock (context, buf)) > 0)
|
||
;
|
||
|
||
if (count != 0) {
|
||
/*g_print (_("GIF: missing EOD in data stream (common occurence)"));*/
|
||
return -2;
|
||
}
|
||
}
|
||
|
||
incode = code;
|
||
|
||
if (code >= context->lzw_max_code) {
|
||
CHECK_LZW_SP ();
|
||
*(context->lzw_sp)++ = context->lzw_firstcode;
|
||
code = context->lzw_oldcode;
|
||
}
|
||
|
||
while (code >= context->lzw_clear_code) {
|
||
if (code >= (1 << MAX_LZW_BITS)) {
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("Bad code encountered"));
|
||
return -2;
|
||
}
|
||
CHECK_LZW_SP ();
|
||
*(context->lzw_sp)++ = context->lzw_table[1][code];
|
||
|
||
if (code == context->lzw_table[0][code]) {
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("Circular table entry in GIF file"));
|
||
return -2;
|
||
}
|
||
code = context->lzw_table[0][code];
|
||
}
|
||
|
||
CHECK_LZW_SP ();
|
||
*(context->lzw_sp)++ = context->lzw_firstcode = context->lzw_table[1][code];
|
||
|
||
if ((code = context->lzw_max_code) < (1 << MAX_LZW_BITS)) {
|
||
context->lzw_table[0][code] = context->lzw_oldcode;
|
||
context->lzw_table[1][code] = context->lzw_firstcode;
|
||
++context->lzw_max_code;
|
||
if ((context->lzw_max_code >= context->lzw_max_code_size) &&
|
||
(context->lzw_max_code_size < (1 << MAX_LZW_BITS))) {
|
||
context->lzw_max_code_size *= 2;
|
||
++context->lzw_code_size;
|
||
}
|
||
}
|
||
|
||
context->lzw_oldcode = incode;
|
||
|
||
if (context->lzw_sp > context->lzw_stack) {
|
||
my_retval = *--(context->lzw_sp);
|
||
return my_retval;
|
||
}
|
||
}
|
||
return code;
|
||
}
|
||
|
||
static void
|
||
gif_set_get_lzw (GifContext *context)
|
||
{
|
||
context->state = GIF_GET_LZW;
|
||
context->draw_xpos = 0;
|
||
context->draw_ypos = 0;
|
||
context->draw_pass = 0;
|
||
}
|
||
|
||
static void
|
||
gif_fill_in_pixels (GifContext *context, guchar *dest, gint offset, guchar v)
|
||
{
|
||
guchar *pixel = NULL;
|
||
guchar (*cmap)[MAXCOLORMAPSIZE];
|
||
|
||
if (context->frame_cmap_active)
|
||
cmap = context->frame_color_map;
|
||
else
|
||
cmap = context->global_color_map;
|
||
|
||
if (context->gif89.transparent != -1) {
|
||
pixel = dest + (context->draw_ypos + offset) * gdk_pixbuf_get_rowstride (context->frame->pixbuf) + context->draw_xpos * 4;
|
||
*pixel = cmap [0][(guchar) v];
|
||
*(pixel+1) = cmap [1][(guchar) v];
|
||
*(pixel+2) = cmap [2][(guchar) v];
|
||
*(pixel+3) = (guchar) ((v == context->gif89.transparent) ? 0 : 255);
|
||
} else {
|
||
pixel = dest + (context->draw_ypos + offset) * gdk_pixbuf_get_rowstride (context->frame->pixbuf) + context->draw_xpos * 3;
|
||
*pixel = cmap [0][(guchar) v];
|
||
*(pixel+1) = cmap [1][(guchar) v];
|
||
*(pixel+2) = cmap [2][(guchar) v];
|
||
}
|
||
}
|
||
|
||
|
||
/* only called if progressive and interlaced */
|
||
static void
|
||
gif_fill_in_lines (GifContext *context, guchar *dest, guchar v)
|
||
{
|
||
switch (context->draw_pass) {
|
||
case 0:
|
||
if (context->draw_ypos > 4) {
|
||
gif_fill_in_pixels (context, dest, -4, v);
|
||
gif_fill_in_pixels (context, dest, -3, v);
|
||
}
|
||
if (context->draw_ypos < (context->frame_height - 4)) {
|
||
gif_fill_in_pixels (context, dest, 3, v);
|
||
gif_fill_in_pixels (context, dest, 4, v);
|
||
}
|
||
/* we don't need a break here. We draw the outer pixels first, then the
|
||
* inner ones, then the innermost ones. case 0 needs to draw all 3 bands.
|
||
* case 1, just the last two, and case 2 just draws the last one*/
|
||
case 1:
|
||
if (context->draw_ypos > 2)
|
||
gif_fill_in_pixels (context, dest, -2, v);
|
||
if (context->draw_ypos < (context->frame_height - 2))
|
||
gif_fill_in_pixels (context, dest, 2, v);
|
||
/* no break as above. */
|
||
case 2:
|
||
if (context->draw_ypos > 1)
|
||
gif_fill_in_pixels (context, dest, -1, v);
|
||
if (context->draw_ypos < (context->frame_height - 1))
|
||
gif_fill_in_pixels (context, dest, 1, v);
|
||
case 3:
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Clips a rectancle to the base dimensions. Returns TRUE if the clipped rectangle is non-empty. */
|
||
static gboolean
|
||
clip_frame (GifContext *context,
|
||
gint *x,
|
||
gint *y,
|
||
gint *width,
|
||
gint *height)
|
||
{
|
||
gint orig_x, orig_y;
|
||
|
||
orig_x = *x;
|
||
orig_y = *y;
|
||
*x = MAX (0, *x);
|
||
*y = MAX (0, *y);
|
||
*width = MIN (context->width, orig_x + *width) - *x;
|
||
*height = MIN (context->height, orig_y + *height) - *y;
|
||
|
||
if (*width > 0 && *height > 0)
|
||
return TRUE;
|
||
|
||
/* The frame is completely off-bounds */
|
||
|
||
*x = 0;
|
||
*y = 0;
|
||
*width = 0;
|
||
*height = 0;
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Call update_func on the given rectangle, unless it is completely off-bounds */
|
||
static void
|
||
maybe_update (GifContext *context,
|
||
gint x,
|
||
gint y,
|
||
gint width,
|
||
gint height)
|
||
{
|
||
if (clip_frame (context, &x, &y, &width, &height))
|
||
(*context->update_func) (context->frame->pixbuf,
|
||
x, y, width, height,
|
||
context->user_data);
|
||
}
|
||
|
||
static int
|
||
gif_get_lzw (GifContext *context)
|
||
{
|
||
guchar *dest, *temp;
|
||
gint lower_bound, upper_bound; /* bounds for emitting the area_updated signal */
|
||
gboolean bound_flag;
|
||
gint first_pass; /* bounds for emitting the area_updated signal */
|
||
gint v;
|
||
|
||
if (context->frame == NULL) {
|
||
context->frame = g_new (GdkPixbufFrame, 1);
|
||
|
||
context->frame->composited = NULL;
|
||
context->frame->revert = NULL;
|
||
|
||
if (context->frame_len == 0 || context->frame_height == 0) {
|
||
/* An empty frame, we just output a single transparent
|
||
* pixel at (0, 0).
|
||
*/
|
||
context->x_offset = 0;
|
||
context->y_offset = 0;
|
||
context->frame_len = 1;
|
||
context->frame_height = 1;
|
||
context->frame->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, 1, 1);
|
||
if (context->frame->pixbuf) {
|
||
guchar *pixels;
|
||
|
||
pixels = gdk_pixbuf_get_pixels (context->frame->pixbuf);
|
||
pixels[0] = 0;
|
||
pixels[1] = 0;
|
||
pixels[2] = 0;
|
||
pixels[3] = 0;
|
||
}
|
||
} else
|
||
context->frame->pixbuf =
|
||
gdk_pixbuf_new (GDK_COLORSPACE_RGB,
|
||
TRUE,
|
||
8,
|
||
context->frame_len,
|
||
context->frame_height);
|
||
if (!context->frame->pixbuf) {
|
||
g_free (context->frame);
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
||
_("Not enough memory to load GIF file"));
|
||
return -2;
|
||
}
|
||
|
||
context->frame->x_offset = context->x_offset;
|
||
context->frame->y_offset = context->y_offset;
|
||
context->frame->need_recomposite = TRUE;
|
||
|
||
/* GIF delay is in hundredths, we want thousandths */
|
||
context->frame->delay_time = context->gif89.delay_time * 10;
|
||
|
||
/* Some GIFs apparently have delay time of 0,
|
||
* that crashes everything so set it to "fast".
|
||
* Also, timeouts less than 20 or so just lock up
|
||
* the app or make the animation choppy, so fix them.
|
||
*/
|
||
if (context->frame->delay_time < 20)
|
||
context->frame->delay_time = 20; /* 20 = "fast" */
|
||
|
||
context->frame->elapsed = context->animation->total_time;
|
||
context->animation->total_time += context->frame->delay_time;
|
||
|
||
switch (context->gif89.disposal) {
|
||
case 0:
|
||
case 1:
|
||
context->frame->action = GDK_PIXBUF_FRAME_RETAIN;
|
||
break;
|
||
case 2:
|
||
context->frame->action = GDK_PIXBUF_FRAME_DISPOSE;
|
||
break;
|
||
case 3:
|
||
context->frame->action = GDK_PIXBUF_FRAME_REVERT;
|
||
break;
|
||
default:
|
||
context->frame->action = GDK_PIXBUF_FRAME_RETAIN;
|
||
break;
|
||
}
|
||
|
||
context->frame->bg_transparent = (context->gif89.transparent == context->background_index);
|
||
|
||
context->animation->n_frames ++;
|
||
context->animation->frames = g_list_append (context->animation->frames, context->frame);
|
||
|
||
/* Only call prepare_func for the first frame */
|
||
if (context->animation->frames->next == NULL) {
|
||
if (context->animation->width == 0 )
|
||
context->animation->width = gdk_pixbuf_get_width(context->frame->pixbuf);
|
||
if (context->animation->height == 0)
|
||
context->animation->height = gdk_pixbuf_get_height (context->frame->pixbuf);
|
||
|
||
if (context->prepare_func)
|
||
(* context->prepare_func) (context->frame->pixbuf,
|
||
GDK_PIXBUF_ANIMATION (context->animation),
|
||
context->user_data);
|
||
} else {
|
||
/* Otherwise init frame with last frame */
|
||
GList *link;
|
||
GdkPixbufFrame *prev_frame;
|
||
gint x, y, w, h;
|
||
|
||
link = g_list_find (context->animation->frames, context->frame);
|
||
|
||
prev_frame = link->prev->data;
|
||
|
||
gdk_pixbuf_gif_anim_frame_composite (context->animation, prev_frame);
|
||
|
||
/* Composite failed */
|
||
if (prev_frame->composited == NULL) {
|
||
GdkPixbufFrame *frame = NULL;
|
||
link = g_list_first (context->animation->frames);
|
||
while (link != NULL) {
|
||
frame = (GdkPixbufFrame *)link->data;
|
||
if (frame != NULL) {
|
||
if (frame->pixbuf != NULL)
|
||
g_object_unref (frame->pixbuf);
|
||
if (frame->composited != NULL)
|
||
g_object_unref (frame->composited);
|
||
if (frame->revert != NULL)
|
||
g_object_unref (frame->revert);
|
||
g_free (frame);
|
||
}
|
||
link = link->next;
|
||
}
|
||
|
||
g_list_free (context->animation->frames);
|
||
context->animation->frames = NULL;
|
||
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
||
_("Not enough memory to composite a frame in GIF file"));
|
||
return -2;
|
||
}
|
||
|
||
x = context->frame->x_offset;
|
||
y = context->frame->y_offset;
|
||
w = gdk_pixbuf_get_width (context->frame->pixbuf);
|
||
h = gdk_pixbuf_get_height (context->frame->pixbuf);
|
||
if (clip_frame (context, &x, &y, &w, &h))
|
||
gdk_pixbuf_copy_area (prev_frame->composited,
|
||
x, y, w, h,
|
||
context->frame->pixbuf,
|
||
0, 0);
|
||
}
|
||
}
|
||
|
||
dest = gdk_pixbuf_get_pixels (context->frame->pixbuf);
|
||
|
||
bound_flag = FALSE;
|
||
lower_bound = upper_bound = context->draw_ypos;
|
||
first_pass = context->draw_pass;
|
||
|
||
while (TRUE) {
|
||
guchar (*cmap)[MAXCOLORMAPSIZE];
|
||
|
||
if (context->frame_cmap_active)
|
||
cmap = context->frame_color_map;
|
||
else
|
||
cmap = context->global_color_map;
|
||
|
||
v = lzw_read_byte (context);
|
||
if (v < 0) {
|
||
goto finished_data;
|
||
}
|
||
bound_flag = TRUE;
|
||
|
||
g_assert (gdk_pixbuf_get_has_alpha (context->frame->pixbuf));
|
||
|
||
temp = dest + context->draw_ypos * gdk_pixbuf_get_rowstride (context->frame->pixbuf) + context->draw_xpos * 4;
|
||
*temp = cmap [0][(guchar) v];
|
||
*(temp+1) = cmap [1][(guchar) v];
|
||
*(temp+2) = cmap [2][(guchar) v];
|
||
*(temp+3) = (guchar) ((v == context->gif89.transparent) ? 0 : 255);
|
||
|
||
if (context->prepare_func && context->frame_interlace)
|
||
gif_fill_in_lines (context, dest, v);
|
||
|
||
context->draw_xpos++;
|
||
|
||
if (context->draw_xpos == context->frame_len) {
|
||
context->draw_xpos = 0;
|
||
if (context->frame_interlace) {
|
||
switch (context->draw_pass) {
|
||
case 0:
|
||
case 1:
|
||
context->draw_ypos += 8;
|
||
break;
|
||
case 2:
|
||
context->draw_ypos += 4;
|
||
break;
|
||
case 3:
|
||
context->draw_ypos += 2;
|
||
break;
|
||
}
|
||
|
||
if (context->draw_ypos >= context->frame_height) {
|
||
context->draw_pass++;
|
||
switch (context->draw_pass) {
|
||
case 1:
|
||
context->draw_ypos = 4;
|
||
break;
|
||
case 2:
|
||
context->draw_ypos = 2;
|
||
break;
|
||
case 3:
|
||
context->draw_ypos = 1;
|
||
break;
|
||
default:
|
||
goto done;
|
||
}
|
||
}
|
||
} else {
|
||
context->draw_ypos++;
|
||
}
|
||
if (context->draw_pass != first_pass) {
|
||
if (context->draw_ypos > lower_bound) {
|
||
lower_bound = 0;
|
||
upper_bound = context->frame_height;
|
||
} else {
|
||
|
||
}
|
||
} else
|
||
upper_bound = context->draw_ypos;
|
||
}
|
||
if (context->draw_ypos >= context->frame_height)
|
||
break;
|
||
}
|
||
|
||
done:
|
||
|
||
context->state = GIF_GET_NEXT_STEP;
|
||
|
||
v = 0;
|
||
|
||
finished_data:
|
||
|
||
if (bound_flag)
|
||
context->frame->need_recomposite = TRUE;
|
||
|
||
if (bound_flag && context->update_func) {
|
||
if (lower_bound <= upper_bound && first_pass == context->draw_pass) {
|
||
maybe_update (context,
|
||
context->frame->x_offset,
|
||
context->frame->y_offset + lower_bound,
|
||
gdk_pixbuf_get_width (context->frame->pixbuf),
|
||
upper_bound - lower_bound);
|
||
} else {
|
||
if (lower_bound <= upper_bound) {
|
||
maybe_update (context,
|
||
context->frame->x_offset,
|
||
context->frame->y_offset,
|
||
gdk_pixbuf_get_width (context->frame->pixbuf),
|
||
gdk_pixbuf_get_height (context->frame->pixbuf));
|
||
} else {
|
||
maybe_update (context,
|
||
context->frame->x_offset,
|
||
context->frame->y_offset,
|
||
gdk_pixbuf_get_width (context->frame->pixbuf),
|
||
upper_bound);
|
||
maybe_update (context,
|
||
context->frame->x_offset,
|
||
context->frame->y_offset + lower_bound,
|
||
gdk_pixbuf_get_width (context->frame->pixbuf),
|
||
gdk_pixbuf_get_height (context->frame->pixbuf) - lower_bound);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (context->state == GIF_GET_NEXT_STEP) {
|
||
/* Will be freed with context->animation, we are just
|
||
* marking that we're done with it (no current frame)
|
||
*/
|
||
context->frame = NULL;
|
||
context->frame_cmap_active = FALSE;
|
||
|
||
if (context->stop_after_first_frame)
|
||
context->state = GIF_DONE;
|
||
}
|
||
|
||
return v;
|
||
}
|
||
|
||
static void
|
||
gif_set_prepare_lzw (GifContext *context)
|
||
{
|
||
context->state = GIF_PREPARE_LZW;
|
||
context->lzw_code_pending = -1;
|
||
}
|
||
static int
|
||
gif_prepare_lzw (GifContext *context)
|
||
{
|
||
gint i;
|
||
|
||
if (!gif_read (context, &(context->lzw_set_code_size), 1)) {
|
||
/*g_message (_("GIF: EOF / read error on image data\n"));*/
|
||
return -1;
|
||
}
|
||
|
||
if (context->lzw_set_code_size > MAX_LZW_BITS) {
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("GIF image is corrupt (incorrect LZW compression)"));
|
||
return -2;
|
||
}
|
||
|
||
context->lzw_code_size = context->lzw_set_code_size + 1;
|
||
context->lzw_clear_code = 1 << context->lzw_set_code_size;
|
||
context->lzw_end_code = context->lzw_clear_code + 1;
|
||
context->lzw_max_code_size = 2 * context->lzw_clear_code;
|
||
context->lzw_max_code = context->lzw_clear_code + 2;
|
||
context->lzw_fresh = TRUE;
|
||
context->code_curbit = 0;
|
||
context->code_lastbit = 0;
|
||
context->code_last_byte = 0;
|
||
context->code_done = FALSE;
|
||
|
||
g_assert (context->lzw_clear_code <=
|
||
G_N_ELEMENTS (context->lzw_table[0]));
|
||
|
||
for (i = 0; i < context->lzw_clear_code; ++i) {
|
||
context->lzw_table[0][i] = 0;
|
||
context->lzw_table[1][i] = i;
|
||
}
|
||
for (; i < (1 << MAX_LZW_BITS); ++i)
|
||
context->lzw_table[0][i] = context->lzw_table[1][0] = 0;
|
||
|
||
context->lzw_sp = context->lzw_stack;
|
||
gif_set_get_lzw (context);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* needs 13 bytes to proceed. */
|
||
static gint
|
||
gif_init (GifContext *context)
|
||
{
|
||
unsigned char buf[16];
|
||
char version[4];
|
||
|
||
if (!gif_read (context, buf, 6)) {
|
||
/* Unable to read magic number,
|
||
* gif_read() should have set error
|
||
*/
|
||
return -1;
|
||
}
|
||
|
||
if (strncmp ((char *) buf, "GIF", 3) != 0) {
|
||
/* Not a GIF file */
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("File does not appear to be a GIF file"));
|
||
return -2;
|
||
}
|
||
|
||
strncpy (version, (char *) buf + 3, 3);
|
||
version[3] = '\0';
|
||
|
||
if ((strcmp (version, "87a") != 0) && (strcmp (version, "89a") != 0)) {
|
||
/* bad version number, not '87a' or '89a' */
|
||
g_set_error (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("Version %s of the GIF file format is not supported"),
|
||
version);
|
||
return -2;
|
||
}
|
||
|
||
/* read the screen descriptor */
|
||
if (!gif_read (context, buf, 7)) {
|
||
/* Failed to read screen descriptor, error set */
|
||
return -1;
|
||
}
|
||
|
||
context->width = LM_to_uint (buf[0], buf[1]);
|
||
context->height = LM_to_uint (buf[2], buf[3]);
|
||
/* The 4th byte is
|
||
* high bit: whether to use the background index
|
||
* next 3: color resolution
|
||
* next: whether colormap is sorted by priority of allocation
|
||
* last 3: size of colormap
|
||
*/
|
||
context->global_bit_pixel = 2 << (buf[4] & 0x07);
|
||
context->global_color_resolution = (((buf[4] & 0x70) >> 3) + 1);
|
||
context->has_global_cmap = (buf[4] & 0x80) != 0;
|
||
context->background_index = buf[5];
|
||
context->aspect_ratio = buf[6];
|
||
|
||
/* Use background of transparent black as default, though if
|
||
* one isn't set explicitly no one should ever use it.
|
||
*/
|
||
context->animation->bg_red = 0;
|
||
context->animation->bg_green = 0;
|
||
context->animation->bg_blue = 0;
|
||
|
||
context->animation->width = context->width;
|
||
context->animation->height = context->height;
|
||
|
||
if (context->has_global_cmap) {
|
||
gif_set_get_colormap (context);
|
||
} else {
|
||
context->state = GIF_GET_NEXT_STEP;
|
||
}
|
||
|
||
#ifdef DUMP_IMAGE_DETAILS
|
||
g_print (">Image width: %d height: %d global_cmap: %d background: %d\n",
|
||
context->width, context->height, context->has_global_cmap, context->background_index);
|
||
#endif
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
gif_set_get_frame_info (GifContext *context)
|
||
{
|
||
context->state = GIF_GET_FRAME_INFO;
|
||
}
|
||
|
||
static gint
|
||
gif_get_frame_info (GifContext *context)
|
||
{
|
||
unsigned char buf[9];
|
||
|
||
if (!gif_read (context, buf, 9)) {
|
||
return -1;
|
||
}
|
||
|
||
/* Okay, we got all the info we need. Lets record it */
|
||
context->frame_len = LM_to_uint (buf[4], buf[5]);
|
||
context->frame_height = LM_to_uint (buf[6], buf[7]);
|
||
context->x_offset = LM_to_uint (buf[0], buf[1]);
|
||
context->y_offset = LM_to_uint (buf[2], buf[3]);
|
||
|
||
if (context->animation->frames == NULL &&
|
||
context->gif89.disposal == 3) {
|
||
/* First frame can't have "revert to previous" as its
|
||
* dispose mode. Silently use "retain" instead.
|
||
*/
|
||
context->gif89.disposal = 0;
|
||
}
|
||
|
||
context->frame_interlace = BitSet (buf[8], INTERLACE);
|
||
|
||
#ifdef DUMP_IMAGE_DETAILS
|
||
g_print (">width: %d height: %d xoffset: %d yoffset: %d disposal: %d delay: %d transparent: %d interlace: %d\n",
|
||
context->frame_len, context->frame_height, context->x_offset, context->y_offset,
|
||
context->gif89.disposal, context->gif89.delay_time, context->gif89.transparent, context->frame_interlace);
|
||
#endif
|
||
|
||
if (BitSet (buf[8], LOCALCOLORMAP)) {
|
||
|
||
#ifdef DUMP_IMAGE_DETAILS
|
||
g_print (">has local colormap\n");
|
||
#endif
|
||
|
||
/* Does this frame have it's own colormap. */
|
||
/* really only relevant when looking at the first frame
|
||
* of an animated gif. */
|
||
/* if it does, we need to re-read in the colormap,
|
||
* the gray_scale, and the bit_pixel */
|
||
context->frame_cmap_active = TRUE;
|
||
context->frame_bit_pixel = 1 << ((buf[8] & 0x07) + 1);
|
||
gif_set_get_colormap2 (context);
|
||
return 0;
|
||
}
|
||
|
||
if (!context->has_global_cmap) {
|
||
context->state = GIF_DONE;
|
||
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("GIF image has no global colormap, and a frame inside it has no local colormap."));
|
||
|
||
return -2;
|
||
}
|
||
|
||
gif_set_prepare_lzw (context);
|
||
return 0;
|
||
|
||
}
|
||
|
||
static gint
|
||
gif_get_next_step (GifContext *context)
|
||
{
|
||
unsigned char c;
|
||
while (TRUE) {
|
||
if (!gif_read (context, &c, 1)) {
|
||
return -1;
|
||
}
|
||
if (c == ';') {
|
||
/* GIF terminator */
|
||
/* hmm. Not 100% sure what to do about this. Should
|
||
* i try to return a blank image instead? */
|
||
context->state = GIF_DONE;
|
||
return 0;
|
||
}
|
||
|
||
if (c == '!') {
|
||
/* Check the extension */
|
||
gif_set_get_extension (context);
|
||
return 0;
|
||
}
|
||
|
||
/* look for frame */
|
||
if (c != ',') {
|
||
/* Not a valid start character */
|
||
continue;
|
||
}
|
||
/* load the frame */
|
||
gif_set_get_frame_info (context);
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
|
||
#define LOG(x) /* g_print ("%d: %s\n", __LINE__, x); */
|
||
|
||
static gint
|
||
gif_main_loop (GifContext *context)
|
||
{
|
||
gint retval = 0;
|
||
|
||
do {
|
||
switch (context->state) {
|
||
case GIF_START:
|
||
LOG("start\n");
|
||
retval = gif_init (context);
|
||
break;
|
||
|
||
case GIF_GET_COLORMAP:
|
||
LOG("get_colormap\n");
|
||
retval = gif_get_colormap (context);
|
||
if (retval == 0)
|
||
context->state = GIF_GET_NEXT_STEP;
|
||
break;
|
||
|
||
case GIF_GET_NEXT_STEP:
|
||
LOG("next_step\n");
|
||
retval = gif_get_next_step (context);
|
||
break;
|
||
|
||
case GIF_GET_FRAME_INFO:
|
||
LOG("frame_info\n");
|
||
retval = gif_get_frame_info (context);
|
||
break;
|
||
|
||
case GIF_GET_EXTENSION:
|
||
LOG("get_extension\n");
|
||
retval = gif_get_extension (context);
|
||
if (retval == 0)
|
||
context->state = GIF_GET_NEXT_STEP;
|
||
break;
|
||
|
||
case GIF_GET_COLORMAP2:
|
||
LOG("get_colormap2\n");
|
||
retval = gif_get_colormap2 (context);
|
||
if (retval == 0)
|
||
gif_set_prepare_lzw (context);
|
||
break;
|
||
|
||
case GIF_PREPARE_LZW:
|
||
LOG("prepare_lzw\n");
|
||
retval = gif_prepare_lzw (context);
|
||
break;
|
||
|
||
case GIF_LZW_FILL_BUFFER:
|
||
LOG("fill_buffer\n");
|
||
retval = gif_lzw_fill_buffer (context);
|
||
break;
|
||
|
||
case GIF_LZW_CLEAR_CODE:
|
||
LOG("clear_code\n");
|
||
retval = gif_lzw_clear_code (context);
|
||
break;
|
||
|
||
case GIF_GET_LZW:
|
||
LOG("get_lzw\n");
|
||
retval = gif_get_lzw (context);
|
||
break;
|
||
|
||
case GIF_DONE:
|
||
LOG("done\n");
|
||
default:
|
||
retval = 0;
|
||
goto done;
|
||
};
|
||
} while ((retval == 0) || (retval == -3));
|
||
done:
|
||
return retval;
|
||
}
|
||
|
||
static GifContext *
|
||
new_context (void)
|
||
{
|
||
GifContext *context;
|
||
|
||
context = g_try_malloc (sizeof (GifContext));
|
||
if (context == NULL)
|
||
return NULL;
|
||
|
||
memset (context, 0, sizeof (GifContext));
|
||
|
||
context->animation = g_object_new (GDK_TYPE_PIXBUF_GIF_ANIM, NULL);
|
||
context->frame = NULL;
|
||
context->file = NULL;
|
||
context->state = GIF_START;
|
||
context->prepare_func = NULL;
|
||
context->update_func = NULL;
|
||
context->user_data = NULL;
|
||
context->buf = NULL;
|
||
context->amount_needed = 0;
|
||
context->gif89.transparent = -1;
|
||
context->gif89.delay_time = -1;
|
||
context->gif89.input_flag = -1;
|
||
context->gif89.disposal = -1;
|
||
context->animation->loop = 1;
|
||
context->in_loop_extension = FALSE;
|
||
context->stop_after_first_frame = FALSE;
|
||
|
||
return context;
|
||
}
|
||
/* Shared library entry point */
|
||
static GdkPixbuf *
|
||
gdk_pixbuf__gif_image_load (FILE *file, GError **error)
|
||
{
|
||
GifContext *context;
|
||
GdkPixbuf *pixbuf;
|
||
|
||
g_return_val_if_fail (file != NULL, NULL);
|
||
|
||
context = new_context ();
|
||
|
||
if (context == NULL) {
|
||
g_set_error_literal (error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
||
_("Not enough memory to load GIF file"));
|
||
return NULL;
|
||
}
|
||
|
||
context->file = file;
|
||
context->error = error;
|
||
context->stop_after_first_frame = TRUE;
|
||
|
||
if (gif_main_loop (context) == -1 || context->animation->frames == NULL) {
|
||
if (context->error && *(context->error) == NULL)
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("GIF file was missing some data (perhaps it was truncated somehow?)"));
|
||
}
|
||
|
||
pixbuf = gdk_pixbuf_animation_get_static_image (GDK_PIXBUF_ANIMATION (context->animation));
|
||
|
||
if (pixbuf)
|
||
g_object_ref (pixbuf);
|
||
|
||
g_object_unref (context->animation);
|
||
|
||
g_free (context->buf);
|
||
g_free (context);
|
||
|
||
return pixbuf;
|
||
}
|
||
|
||
static gpointer
|
||
gdk_pixbuf__gif_image_begin_load (GdkPixbufModuleSizeFunc size_func,
|
||
GdkPixbufModulePreparedFunc prepare_func,
|
||
GdkPixbufModuleUpdatedFunc update_func,
|
||
gpointer user_data,
|
||
GError **error)
|
||
{
|
||
GifContext *context;
|
||
|
||
#ifdef IO_GIFDEBUG
|
||
count = 0;
|
||
#endif
|
||
context = new_context ();
|
||
|
||
if (context == NULL) {
|
||
g_set_error_literal (error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
||
_("Not enough memory to load GIF file"));
|
||
return NULL;
|
||
}
|
||
|
||
context->error = error;
|
||
context->prepare_func = prepare_func;
|
||
context->update_func = update_func;
|
||
context->user_data = user_data;
|
||
|
||
return (gpointer) context;
|
||
}
|
||
|
||
static gboolean
|
||
gdk_pixbuf__gif_image_stop_load (gpointer data, GError **error)
|
||
{
|
||
GifContext *context = (GifContext *) data;
|
||
gboolean retval = TRUE;
|
||
|
||
if (context->state != GIF_DONE || context->animation->frames == NULL) {
|
||
g_set_error_literal (error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("GIF image was truncated or incomplete."));
|
||
|
||
retval = FALSE;
|
||
}
|
||
|
||
g_object_unref (context->animation);
|
||
|
||
g_free (context->buf);
|
||
g_free (context);
|
||
|
||
return retval;
|
||
}
|
||
|
||
static gboolean
|
||
gdk_pixbuf__gif_image_load_increment (gpointer data,
|
||
const guchar *buf, guint size,
|
||
GError **error)
|
||
{
|
||
gint retval;
|
||
GifContext *context = (GifContext *) data;
|
||
|
||
context->error = error;
|
||
|
||
if (context->amount_needed == 0) {
|
||
/* we aren't looking for some bytes. */
|
||
/* we can use buf now, but we don't want to keep it around at all.
|
||
* it will be gone by the end of the call. */
|
||
context->buf = (guchar*) buf; /* very dubious const cast */
|
||
context->ptr = 0;
|
||
context->size = size;
|
||
} else {
|
||
/* we need some bytes */
|
||
if (size < context->amount_needed) {
|
||
context->amount_needed -= size;
|
||
/* copy it over and return */
|
||
memcpy (context->buf + context->size, buf, size);
|
||
context->size += size;
|
||
return TRUE;
|
||
} else if (size == context->amount_needed) {
|
||
memcpy (context->buf + context->size, buf, size);
|
||
context->size += size;
|
||
} else {
|
||
context->buf = g_realloc (context->buf, context->size + size);
|
||
memcpy (context->buf + context->size, buf, size);
|
||
context->size += size;
|
||
}
|
||
}
|
||
|
||
retval = gif_main_loop (context);
|
||
|
||
if (retval == -2) {
|
||
if (context->buf == buf)
|
||
context->buf = NULL;
|
||
return FALSE;
|
||
}
|
||
if (retval == -1) {
|
||
/* we didn't have enough memory */
|
||
/* prepare for the next image_load_increment */
|
||
if (context->buf == buf) {
|
||
g_assert (context->size == size);
|
||
context->buf = g_new (guchar, context->amount_needed + (context->size - context->ptr));
|
||
memcpy (context->buf, buf + context->ptr, context->size - context->ptr);
|
||
} else {
|
||
/* copy the left overs to the begining of the buffer */
|
||
/* and realloc the memory */
|
||
memmove (context->buf, context->buf + context->ptr, context->size - context->ptr);
|
||
context->buf = g_realloc (context->buf, context->amount_needed + (context->size - context->ptr));
|
||
}
|
||
context->size = context->size - context->ptr;
|
||
context->ptr = 0;
|
||
} else {
|
||
/* we are prolly all done */
|
||
if (context->buf == buf)
|
||
context->buf = NULL;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
static GdkPixbufAnimation *
|
||
gdk_pixbuf__gif_image_load_animation (FILE *file,
|
||
GError **error)
|
||
{
|
||
GifContext *context;
|
||
GdkPixbufAnimation *animation;
|
||
|
||
g_return_val_if_fail (file != NULL, NULL);
|
||
|
||
context = new_context ();
|
||
|
||
if (context == NULL) {
|
||
g_set_error_literal (error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
||
_("Not enough memory to load GIF file"));
|
||
return NULL;
|
||
}
|
||
|
||
context->error = error;
|
||
context->file = file;
|
||
|
||
if (gif_main_loop (context) == -1 || context->animation->frames == NULL) {
|
||
if (context->error && *(context->error) == NULL)
|
||
g_set_error_literal (context->error,
|
||
GDK_PIXBUF_ERROR,
|
||
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
||
_("GIF file was missing some data (perhaps it was truncated somehow?)"));
|
||
|
||
g_object_unref (context->animation);
|
||
context->animation = NULL;
|
||
}
|
||
|
||
if (context->animation)
|
||
animation = GDK_PIXBUF_ANIMATION (context->animation);
|
||
else
|
||
animation = NULL;
|
||
|
||
if (context->error && *(context->error))
|
||
g_print ("%s\n", (*(context->error))->message);
|
||
|
||
g_free (context->buf);
|
||
g_free (context);
|
||
return animation;
|
||
}
|
||
|
||
#ifndef INCLUDE_gif
|
||
#define MODULE_ENTRY(function) G_MODULE_EXPORT void function
|
||
#else
|
||
#define MODULE_ENTRY(function) void _gdk_pixbuf__gif_ ## function
|
||
#endif
|
||
|
||
MODULE_ENTRY (fill_vtable) (GdkPixbufModule *module)
|
||
{
|
||
module->load = gdk_pixbuf__gif_image_load;
|
||
module->begin_load = gdk_pixbuf__gif_image_begin_load;
|
||
module->stop_load = gdk_pixbuf__gif_image_stop_load;
|
||
module->load_increment = gdk_pixbuf__gif_image_load_increment;
|
||
module->load_animation = gdk_pixbuf__gif_image_load_animation;
|
||
}
|
||
|
||
MODULE_ENTRY (fill_info) (GdkPixbufFormat *info)
|
||
{
|
||
static GdkPixbufModulePattern signature[] = {
|
||
{ "GIF8", NULL, 100 },
|
||
{ NULL, NULL, 0 }
|
||
};
|
||
static gchar * mime_types[] = {
|
||
"image/gif",
|
||
NULL
|
||
};
|
||
static gchar * extensions[] = {
|
||
"gif",
|
||
NULL
|
||
};
|
||
|
||
info->name = "gif";
|
||
info->signature = signature;
|
||
info->description = N_("The GIF image format");
|
||
info->mime_types = mime_types;
|
||
info->extensions = extensions;
|
||
info->flags = GDK_PIXBUF_FORMAT_THREADSAFE;
|
||
info->license = "LGPL";
|
||
}
|