1415 lines
34 KiB
C
1415 lines
34 KiB
C
/* load a GIF with giflib
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*
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* 10/2/16
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* - from svgload.c
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* 25/4/16
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* - add giflib5 support
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* 26/7/16
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* - transparency was wrong if there was no EXTENSION_RECORD
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* - write 1, 2, 3, or 4 bands depending on file contents
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* 17/8/16
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* - support unicode on win
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* 19/8/16
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* - better transparency detection, thanks diegocsandrim
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* 25/11/16
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* - support @n, page-height
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* 5/10/17
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* - colormap can be missing thanks Kleis
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* 21/11/17
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* - add "gif-delay", "gif-loop", "gif-comment" metadata
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* - add dispose handling
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* 13/8/18
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* - init pages to 0 before load
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* 14/2/19
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* - rework as a sequential loader ... simpler, much lower mem use
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define DEBUG_VERBOSE
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*/
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#define VIPS_DEBUG
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <vips/vips.h>
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#include <vips/buf.h>
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#include <vips/internal.h>
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#include <vips/debug.h>
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#ifdef HAVE_GIFLIB
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#include <gif_lib.h>
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/* giflib 5 is rather different :-( functions have error returns and there's
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* no LastError().
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*
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* GIFLIB_MAJOR was introduced in 4.1.6. Use it to test for giflib 5.x.
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*/
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#ifdef GIFLIB_MAJOR
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# if GIFLIB_MAJOR > 4
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# define HAVE_GIFLIB_5
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# endif
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#endif
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/* Added in giflib5.
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*
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* DO_NOT - no dispose action after frame load
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* BACKGROUND - after frame load, reset to 0 (transparent)
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* PREVIOUS - after frame load, reset previous
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*/
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#ifndef HAVE_GIFLIB_5
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#define DISPOSAL_UNSPECIFIED 0
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#define DISPOSE_DO_NOT 1
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#define DISPOSE_BACKGROUND 2
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#define DISPOSE_PREVIOUS 3
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#endif
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#define VIPS_TYPE_FOREIGN_LOAD_GIF (vips_foreign_load_gif_get_type())
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#define VIPS_FOREIGN_LOAD_GIF( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_FOREIGN_LOAD_GIF, VipsForeignLoadGif ))
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#define VIPS_FOREIGN_LOAD_GIF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_FOREIGN_LOAD_GIF, VipsForeignLoadGifClass))
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#define VIPS_IS_FOREIGN_LOAD_GIF( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_FOREIGN_LOAD_GIF ))
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#define VIPS_IS_FOREIGN_LOAD_GIF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_FOREIGN_LOAD_GIF ))
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#define VIPS_FOREIGN_LOAD_GIF_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_FOREIGN_LOAD_GIF, VipsForeignLoadGifClass ))
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typedef struct _VipsForeignLoadGif {
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VipsForeignLoad parent_object;
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/* Load from this page (frame number).
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*/
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int page;
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/* Load this many pages.
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*/
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int n;
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GifFileType *file;
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/* We decompress the whole thing to a huge RGBA memory image, and
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* as we render, watch for bands and transparency. At the end of
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* loading, we copy 1 or 3 bands, with or without transparency to
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* output.
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*/
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gboolean has_transparency;
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gboolean has_colour;
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/* Delay in 1/100ths of a second. We only track a single delay
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* value for the whole file, and we report the first delay we see. Some
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* GIFs have a long delay on the final frame.
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*/
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gboolean has_delay;
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int delay;
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/* Number of times to loop the animation.
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*/
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int loop;
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/* The GIF comment, if any.
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*/
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char *comment;
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/* The number of pages (frame) in the image.
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*/
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int n_pages;
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/* A memory image the sized of one frame ... we accumulate to this as
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* we scan the image, and copy lines to the output on generate.
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*/
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VipsImage *frame;
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/* A copy of the previous frame, in case we need a DISPOSE_PREVIOUS.
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*/
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VipsImage *previous;
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/* The position of @frame, in pages.
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*/
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int current_page;
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/* Decompress lines of the gif file to here.
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*/
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GifPixelType *line;
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/* The current dispose method.
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*/
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int dispose;
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/* Set for EOF detected.
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*/
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gboolean eof;
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/* The current cmap unpacked to a simple LUT. Each uint32 is really an
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* RGBA pixel ready to be blasted into @frame.
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*/
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guint32 cmap[256];
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/* As we scan the file, the index of the transparent pixel for this
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* frame.
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*/
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int transparency;
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/* Params for DGifOpen(). Set by subclasses, called by base class in
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* _open().
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*/
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void *userPtr;
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InputFunc read_func;
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} VipsForeignLoadGif;
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typedef struct _VipsForeignLoadGifClass {
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VipsForeignLoadClass parent_class;
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/* Close and reopen gif->file.
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*/
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int (*open)( VipsForeignLoadGif *gif );
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} VipsForeignLoadGifClass;
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G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadGif, vips_foreign_load_gif,
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VIPS_TYPE_FOREIGN_LOAD );
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/* From gif2rgb.c ... offsets and jumps for interlaced GIF images.
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*/
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static int
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InterlacedOffset[] = { 0, 4, 2, 1 },
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InterlacedJumps[] = { 8, 8, 4, 2 };
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/* giflib4 was missing this.
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*/
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static const char *
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vips_foreign_load_gif_errstr( int error_code )
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{
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#ifdef HAVE_GIFLIB_5
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return( GifErrorString( error_code ) );
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#else /*!HAVE_GIFLIB_5*/
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switch( error_code ) {
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case D_GIF_ERR_OPEN_FAILED:
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return( _( "Failed to open given file" ) );
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case D_GIF_ERR_READ_FAILED:
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return( _( "Failed to read from given file" ) );
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case D_GIF_ERR_NOT_GIF_FILE:
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return( _( "Data is not a GIF file" ) );
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case D_GIF_ERR_NO_SCRN_DSCR:
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return( _( "No screen descriptor detected" ) );
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case D_GIF_ERR_NO_IMAG_DSCR:
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return( _( "No image descriptor detected" ) );
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case D_GIF_ERR_NO_COLOR_MAP:
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return( _( "Neither global nor local color map" ) );
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case D_GIF_ERR_WRONG_RECORD:
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return( _( "Wrong record type detected" ) );
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case D_GIF_ERR_DATA_TOO_BIG:
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return( _( "Number of pixels bigger than width * height" ) );
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case D_GIF_ERR_NOT_ENOUGH_MEM:
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return( _( "Failed to allocate required memory" ) );
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case D_GIF_ERR_CLOSE_FAILED:
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return( _( "Failed to close given file" ) );
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case D_GIF_ERR_NOT_READABLE:
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return( _( "Given file was not opened for read" ) );
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case D_GIF_ERR_IMAGE_DEFECT:
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return( _( "Image is defective, decoding aborted" ) );
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case D_GIF_ERR_EOF_TOO_SOON:
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return( _( "Image EOF detected, before image complete" ) );
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default:
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return( _( "Unknown error" ) );
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}
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#endif /*HAVE_GIFLIB_5*/
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}
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static void
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vips_foreign_load_gif_error_vips( VipsForeignLoadGif *gif, int error )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( gif );
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const char *message;
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if( (message = vips_foreign_load_gif_errstr( error )) )
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vips_error( class->nickname, "%s", message );
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}
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static void
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vips_foreign_load_gif_error( VipsForeignLoadGif *gif )
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{
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int error;
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error = 0;
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#ifdef HAVE_GIFLIB_5
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if( gif->file )
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error = gif->file->Error;
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#else
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error = GifLastError();
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#endif
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if( error )
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vips_foreign_load_gif_error_vips( gif, error );
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}
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static void
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vips_foreign_load_gif_close( VipsForeignLoadGif *gif )
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{
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#ifdef HAVE_GIFLIB_5
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if( gif->file ) {
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int error;
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if( DGifCloseFile( gif->file, &error ) == GIF_ERROR )
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vips_foreign_load_gif_error_vips( gif, error );
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gif->file = NULL;
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}
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#else
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if( gif->file ) {
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if( DGifCloseFile( gif->file ) == GIF_ERROR )
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vips_foreign_load_gif_error_vips( gif, GifLastError() );
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gif->file = NULL;
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}
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#endif
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}
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static void
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vips_foreign_load_gif_dispose( GObject *gobject )
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{
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VipsForeignLoadGif *gif = (VipsForeignLoadGif *) gobject;
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vips_foreign_load_gif_close( gif );
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VIPS_UNREF( gif->frame );
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VIPS_UNREF( gif->previous );
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VIPS_FREE( gif->comment );
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VIPS_FREE( gif->line )
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G_OBJECT_CLASS( vips_foreign_load_gif_parent_class )->
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dispose( gobject );
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}
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static VipsForeignFlags
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vips_foreign_load_gif_get_flags_filename( const char *filename )
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{
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return( VIPS_FOREIGN_SEQUENTIAL );
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}
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static VipsForeignFlags
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vips_foreign_load_gif_get_flags( VipsForeignLoad *load )
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{
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return( VIPS_FOREIGN_SEQUENTIAL );
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}
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static gboolean
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vips_foreign_load_gif_is_a_buffer( const void *buf, size_t len )
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{
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const guchar *str = (const guchar *) buf;
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if( len >= 4 &&
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str[0] == 'G' &&
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str[1] == 'I' &&
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str[2] == 'F' &&
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str[3] == '8' )
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return( 1 );
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return( 0 );
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}
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static gboolean
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vips_foreign_load_gif_is_a( const char *filename )
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{
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unsigned char buf[4];
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if( vips__get_bytes( filename, buf, 4 ) == 4 &&
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vips_foreign_load_gif_is_a_buffer( buf, 4 ) )
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return( 1 );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_ext_next( VipsForeignLoadGif *gif,
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GifByteType **extension )
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{
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if( DGifGetExtensionNext( gif->file, extension ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( *extension )
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VIPS_DEBUG_MSG( "gifload: EXTENSION_NEXT\n" );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_code_next( VipsForeignLoadGif *gif,
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GifByteType **extension )
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{
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if( DGifGetCodeNext( gif->file, extension ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( *extension )
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VIPS_DEBUG_MSG( "gifload: CODE_NEXT\n" );
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return( 0 );
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}
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/* Quickly scan an image record.
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*/
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static int
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vips_foreign_load_gif_scan_image_record( VipsForeignLoadGif *gif )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( gif );
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GifFileType *file = gif->file;
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ColorMapObject *map = file->Image.ColorMap ?
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file->Image.ColorMap : file->SColorMap;
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GifByteType *extension;
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/* Check that the frame looks sane. Perhaps giflib checks
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* this for us.
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*/
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if( file->Image.Left < 0 ||
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file->Image.Width < 1 ||
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file->Image.Width > 10000 ||
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file->Image.Left + file->Image.Width > file->SWidth ||
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file->Image.Top < 0 ||
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file->Image.Height < 1 ||
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file->Image.Height > 10000 ||
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file->Image.Top + file->Image.Height > file->SHeight ) {
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vips_error( class->nickname, "%s", _( "bad frame size" ) );
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return( -1 );
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}
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/* Test for a non-greyscale colourmap for this frame.
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*/
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if( !gif->has_colour &&
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map ) {
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int i;
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for( i = 0; i < map->ColorCount; i++ )
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if( map->Colors[i].Red != map->Colors[i].Green ||
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map->Colors[i].Green != map->Colors[i].Blue ) {
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gif->has_colour = TRUE;
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break;
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}
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}
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/* Step over compressed image data.
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*/
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do {
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if( vips_foreign_load_gif_code_next( gif, &extension ) )
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return( -1 );
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} while( extension != NULL );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_scan_application_ext( VipsForeignLoadGif *gif,
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GifByteType *extension )
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{
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gboolean have_netscape;
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/* The 11-byte NETSCAPE extension.
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*/
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have_netscape = FALSE;
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if( extension[0] == 11 &&
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vips_isprefix( "NETSCAPE2.0", (const char*) (extension + 1) ) )
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have_netscape = TRUE;
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while( extension != NULL ) {
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if( vips_foreign_load_gif_ext_next( gif, &extension ) )
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return( -1 );
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if( have_netscape &&
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extension &&
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extension[0] == 3 &&
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extension[1] == 1 )
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gif->loop = extension[2] | (extension[3] << 8);
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}
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return( 0 );
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}
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static int
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vips_foreign_load_gif_scan_comment_ext( VipsForeignLoadGif *gif,
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GifByteType *extension )
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{
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VIPS_DEBUG_MSG( "gifload: type: comment\n" );
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if( !gif->comment ) {
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/* Up to 257 with a NULL terminator.
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*/
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char comment[257];
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vips_strncpy( comment, (char *) (extension + 1), 256 );
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comment[extension[0]] = '\0';
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gif->comment = g_strdup( comment );
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}
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while( extension != NULL )
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if( vips_foreign_load_gif_ext_next( gif, &extension ) )
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return( -1 );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_scan_extension( VipsForeignLoadGif *gif )
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{
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GifByteType *extension;
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int ext_code;
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if( DGifGetExtension( gif->file, &ext_code, &extension ) ==
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GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( extension )
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switch( ext_code ) {
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case GRAPHICS_EXT_FUNC_CODE:
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if( extension[0] == 4 &&
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extension[1] & 0x1 ) {
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VIPS_DEBUG_MSG( "gifload: has transp.\n" );
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gif->has_transparency = TRUE;
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}
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if( !gif->has_delay ) {
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VIPS_DEBUG_MSG( "gifload: has delay\n" );
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gif->has_delay = TRUE;
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gif->delay = extension[2] | (extension[3] << 8);
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}
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|
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while( extension != NULL )
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if( vips_foreign_load_gif_ext_next( gif,
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&extension ) )
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return( -1 );
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break;
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case APPLICATION_EXT_FUNC_CODE:
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if( vips_foreign_load_gif_scan_application_ext( gif,
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extension ) )
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return( -1 );
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break;
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|
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case COMMENT_EXT_FUNC_CODE:
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if( vips_foreign_load_gif_scan_comment_ext( gif,
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extension ) )
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return( -1 );
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break;
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|
|
default:
|
|
/* Step over any NEXT blocks for unknown extensions.
|
|
*/
|
|
while( extension != NULL )
|
|
if( vips_foreign_load_gif_ext_next( gif,
|
|
&extension ) )
|
|
return( -1 );
|
|
break;
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_gif_set_header( VipsForeignLoadGif *gif, VipsImage *image )
|
|
{
|
|
vips_image_init_fields( image,
|
|
gif->file->SWidth, gif->file->SHeight * gif->n,
|
|
(gif->has_colour ? 3 : 1) + (gif->has_transparency ? 1 : 0),
|
|
VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
|
|
gif->has_colour ?
|
|
VIPS_INTERPRETATION_sRGB : VIPS_INTERPRETATION_B_W,
|
|
1.0, 1.0 );
|
|
vips_image_pipelinev( image, VIPS_DEMAND_STYLE_FATSTRIP, NULL );
|
|
|
|
if( gif->n_pages > 1 ) {
|
|
vips_image_set_int( image,
|
|
VIPS_META_PAGE_HEIGHT, gif->file->SHeight );
|
|
vips_image_set_int( image, VIPS_META_N_PAGES, gif->n_pages );
|
|
}
|
|
vips_image_set_int( image, "gif-delay", gif->delay );
|
|
vips_image_set_int( image, "gif-loop", gif->loop );
|
|
if( gif->comment )
|
|
vips_image_set_string( image, "gif-comment", gif->comment );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/* Attempt to quickly scan a GIF and discover what we need for our header. We
|
|
* need to scan the whole file to get n_pages, transparency and colour.
|
|
*/
|
|
static int
|
|
vips_foreign_load_gif_header( VipsForeignLoad *load )
|
|
{
|
|
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( load );
|
|
VipsForeignLoadGifClass *gif_class =
|
|
(VipsForeignLoadGifClass *) VIPS_OBJECT_GET_CLASS( load );
|
|
VipsForeignLoadGif *gif = (VipsForeignLoadGif *) load;
|
|
|
|
GifRecordType record;
|
|
|
|
if( gif_class->open( gif ) )
|
|
return( -1 );
|
|
|
|
gif->n_pages = 0;
|
|
|
|
do {
|
|
if( DGifGetRecordType( gif->file, &record ) == GIF_ERROR ) {
|
|
vips_foreign_load_gif_error( gif );
|
|
return( -1 );
|
|
}
|
|
|
|
switch( record ) {
|
|
case IMAGE_DESC_RECORD_TYPE:
|
|
if( DGifGetImageDesc( gif->file ) == GIF_ERROR ) {
|
|
vips_foreign_load_gif_error( gif );
|
|
return( -1 );
|
|
}
|
|
|
|
/* Read in the image record.
|
|
*/
|
|
if( vips_foreign_load_gif_scan_image_record( gif ) )
|
|
return( -1 );
|
|
|
|
gif->n_pages += 1;
|
|
|
|
break;
|
|
|
|
case EXTENSION_RECORD_TYPE:
|
|
/* We will need to fetch the extensions to check for
|
|
* cmaps and transparency.
|
|
*/
|
|
if( vips_foreign_load_gif_scan_extension( gif ) )
|
|
return( -1 );
|
|
break;
|
|
|
|
case TERMINATE_RECORD_TYPE:
|
|
gif->eof = TRUE;
|
|
break;
|
|
|
|
case SCREEN_DESC_RECORD_TYPE:
|
|
case UNDEFINED_RECORD_TYPE:
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
} while( !gif->eof );
|
|
|
|
if( gif->n == -1 )
|
|
gif->n = gif->n_pages - gif->page;
|
|
|
|
if( gif->page < 0 ||
|
|
gif->n <= 0 ||
|
|
gif->page + gif->n > gif->n_pages ) {
|
|
vips_error( class->nickname, "%s", _( "bad page number" ) );
|
|
return( -1 );
|
|
}
|
|
|
|
/* And set the output vips header from what we've learned.
|
|
*/
|
|
if( vips_foreign_load_gif_set_header( gif, load->out ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_gif_build_cmap( VipsForeignLoadGif *gif )
|
|
{
|
|
ColorMapObject *map = gif->file->Image.ColorMap ?
|
|
gif->file->Image.ColorMap : gif->file->SColorMap;
|
|
|
|
int v;
|
|
|
|
for( v = 0; v < 256; v++ ) {
|
|
VipsPel *q = (VipsPel *) &gif->cmap[v];
|
|
|
|
if( map &&
|
|
v < map->ColorCount ) {
|
|
q[0] = map->Colors[v].Red;
|
|
q[1] = map->Colors[v].Green;
|
|
q[2] = map->Colors[v].Blue;
|
|
q[3] = 255;
|
|
}
|
|
else {
|
|
/* If there's no map, just save the index.
|
|
*/
|
|
q[0] = v;
|
|
q[1] = v;
|
|
q[2] = v;
|
|
q[3] = 255;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_gif_render_line( VipsForeignLoadGif *gif,
|
|
int width, VipsPel * restrict q, VipsPel * restrict p )
|
|
{
|
|
guint32 *iq;
|
|
int x;
|
|
|
|
iq = (guint32 *) q;
|
|
for( x = 0; x < width; x++ ) {
|
|
VipsPel v = p[x];
|
|
|
|
if( v == gif->transparency ) {
|
|
/* In DISPOSE_DO_NOT mode, the previous frame shows
|
|
* through (ie. we do nothing). In all other modes,
|
|
* it's just transparent.
|
|
*/
|
|
if( gif->dispose != DISPOSE_DO_NOT )
|
|
iq[x] = 0;
|
|
}
|
|
else
|
|
/* Blast in the RGBA for this value.
|
|
*/
|
|
iq[x] = gif->cmap[v];
|
|
}
|
|
}
|
|
|
|
/* Render the current gif frame into an RGBA buffer. GIFs can accumulate,
|
|
* depending on the current dispose mode.
|
|
*/
|
|
static int
|
|
vips_foreign_load_gif_render( VipsForeignLoadGif *gif )
|
|
{
|
|
GifFileType *file = gif->file;
|
|
|
|
/* Update the colour map for this frame.
|
|
*/
|
|
vips_foreign_load_gif_build_cmap( gif );
|
|
|
|
/* DISPOSE_BACKGROUND means transparent pixels in this frame will show
|
|
* the background of the web page, ie. be transparent.
|
|
*
|
|
* PREVIOUS means we init with the last non-previous frame.
|
|
*
|
|
* Otherwise, we must update previous.
|
|
*/
|
|
if( gif->dispose == DISPOSE_BACKGROUND ) {
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_render: "
|
|
"dispose clear to zero\n" );
|
|
memset( VIPS_IMAGE_ADDR( gif->frame, 0, 0 ), 0,
|
|
VIPS_IMAGE_SIZEOF_IMAGE( gif->frame ) );
|
|
}
|
|
else if( gif->dispose == DISPOSE_PREVIOUS ) {
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_render: "
|
|
"dispose restore from previous\n" );
|
|
memcpy( VIPS_IMAGE_ADDR( gif->frame, 0, 0 ),
|
|
VIPS_IMAGE_ADDR( gif->previous, 0, 0 ),
|
|
VIPS_IMAGE_SIZEOF_IMAGE( gif->frame ) );
|
|
}
|
|
else {
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_render: "
|
|
"dispose copy to previous\n" );
|
|
memcpy( VIPS_IMAGE_ADDR( gif->previous, 0, 0 ),
|
|
VIPS_IMAGE_ADDR( gif->frame, 0, 0 ),
|
|
VIPS_IMAGE_SIZEOF_IMAGE( gif->frame ) );
|
|
}
|
|
|
|
if( file->Image.Interlace ) {
|
|
int i;
|
|
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_render: "
|
|
"interlaced frame of %d x %d pixels at %d x %d\n",
|
|
file->Image.Width, file->Image.Height,
|
|
file->Image.Left, file->Image.Top );
|
|
|
|
for( i = 0; i < 4; i++ ) {
|
|
int y;
|
|
|
|
for( y = InterlacedOffset[i];
|
|
y < file->Image.Height;
|
|
y += InterlacedJumps[i] ) {
|
|
VipsPel *q = VIPS_IMAGE_ADDR( gif->frame,
|
|
file->Image.Left, file->Image.Top + y );
|
|
|
|
if( DGifGetLine( gif->file, gif->line,
|
|
file->Image.Width ) == GIF_ERROR ) {
|
|
vips_foreign_load_gif_error( gif );
|
|
return( -1 );
|
|
}
|
|
|
|
vips_foreign_load_gif_render_line( gif,
|
|
file->Image.Width, q, gif->line );
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
int y;
|
|
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_render: "
|
|
"non-interlaced frame of %d x %d pixels at %d x %d\n",
|
|
file->Image.Width, file->Image.Height,
|
|
file->Image.Left, file->Image.Top );
|
|
|
|
for( y = 0; y < file->Image.Height; y++ ) {
|
|
VipsPel *q = VIPS_IMAGE_ADDR( gif->frame,
|
|
file->Image.Left, file->Image.Top + y );
|
|
|
|
if( DGifGetLine( gif->file, gif->line,
|
|
file->Image.Width ) == GIF_ERROR ) {
|
|
vips_foreign_load_gif_error( gif );
|
|
return( -1 );
|
|
}
|
|
|
|
vips_foreign_load_gif_render_line( gif,
|
|
file->Image.Width, q, gif->line );
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_gif_extension( VipsForeignLoadGif *gif )
|
|
{
|
|
GifByteType *extension;
|
|
int ext_code;
|
|
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_extension:\n" );
|
|
|
|
if( DGifGetExtension( gif->file, &ext_code, &extension ) ==
|
|
GIF_ERROR ) {
|
|
vips_foreign_load_gif_error( gif );
|
|
return( -1 );
|
|
}
|
|
|
|
if( extension &&
|
|
ext_code == GRAPHICS_EXT_FUNC_CODE &&
|
|
extension[0] == 4 ) {
|
|
/* Bytes are flags, delay low, delay high,
|
|
* transparency. Flag bit 1 means transparency
|
|
* is being set.
|
|
*/
|
|
gif->transparency = -1;
|
|
if( extension[1] & 0x1 )
|
|
gif->transparency = extension[4];
|
|
|
|
/* Set the current dispose mode. This is read during frame load
|
|
* to set the meaning of background and transparent pixels.
|
|
*/
|
|
gif->dispose = (extension[1] >> 2) & 0x7;
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_extension: "
|
|
"dispose = %d\n", gif->dispose );
|
|
}
|
|
|
|
while( extension != NULL )
|
|
if( vips_foreign_load_gif_ext_next( gif, &extension ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/* Read the next page from the file into @frame.
|
|
*/
|
|
static int
|
|
vips_foreign_load_gif_next_page( VipsForeignLoadGif *gif )
|
|
{
|
|
GifRecordType record;
|
|
gboolean have_read_frame;
|
|
|
|
have_read_frame = FALSE;
|
|
do {
|
|
if( DGifGetRecordType( gif->file, &record ) == GIF_ERROR ) {
|
|
vips_foreign_load_gif_error( gif );
|
|
return( -1 );
|
|
}
|
|
|
|
switch( record ) {
|
|
case IMAGE_DESC_RECORD_TYPE:
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_next_page: "
|
|
"IMAGE_DESC_RECORD_TYPE\n" );
|
|
|
|
if( DGifGetImageDesc( gif->file ) == GIF_ERROR ) {
|
|
vips_foreign_load_gif_error( gif );
|
|
return( -1 );
|
|
}
|
|
|
|
if( vips_foreign_load_gif_render( gif ) )
|
|
return( -1 );
|
|
|
|
have_read_frame = TRUE;
|
|
|
|
break;
|
|
|
|
case EXTENSION_RECORD_TYPE:
|
|
if( vips_foreign_load_gif_extension( gif ) )
|
|
return( -1 );
|
|
break;
|
|
|
|
case TERMINATE_RECORD_TYPE:
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_next_page: "
|
|
"TERMINATE_RECORD_TYPE\n" );
|
|
gif->eof = TRUE;
|
|
break;
|
|
|
|
case SCREEN_DESC_RECORD_TYPE:
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_next_page: "
|
|
"SCREEN_DESC_RECORD_TYPE\n" );
|
|
break;
|
|
|
|
case UNDEFINED_RECORD_TYPE:
|
|
VIPS_DEBUG_MSG( "vips_foreign_load_gif_next_page: "
|
|
"UNDEFINED_RECORD_TYPE\n" );
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
} while( !have_read_frame &&
|
|
!gif->eof );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_gif_generate( VipsRegion *or,
|
|
void *seq, void *a, void *b, gboolean *stop )
|
|
{
|
|
VipsRect *r = &or->valid;
|
|
VipsForeignLoadGif *gif = (VipsForeignLoadGif *) a;
|
|
|
|
int y;
|
|
|
|
for( y = 0; y < r->height; y++ ) {
|
|
/* The page for this output line, and the line number in page.
|
|
*/
|
|
int page = (r->top + y) / gif->file->SHeight + gif->page;
|
|
int line = (r->top + y) % gif->file->SHeight;
|
|
|
|
VipsPel *p, *q;
|
|
int x;
|
|
|
|
g_assert( line >= 0 && line < gif->frame->Ysize );
|
|
g_assert( page >= 0 && page < gif->n_pages );
|
|
|
|
/* current_page == 0 means we've not loaded any pages yet. So
|
|
* we need to have loaded the page beyond the page we want.
|
|
*/
|
|
while( gif->current_page <= page ) {
|
|
if( vips_foreign_load_gif_next_page( gif ) )
|
|
return( -1 );
|
|
|
|
gif->current_page += 1;
|
|
}
|
|
|
|
/* @frame is always RGBA, but or may be G, GA, RGB or RGBA.
|
|
* We have to pick out the values we want.
|
|
*/
|
|
p = VIPS_IMAGE_ADDR( gif->frame, 0, line );
|
|
q = VIPS_REGION_ADDR( or, 0, r->top + y );
|
|
switch( or->im->Bands ) {
|
|
case 1:
|
|
for( x = 0; x < gif->frame->Xsize; x++ ) {
|
|
q[0] = p[1];
|
|
|
|
q += 1;
|
|
p += 4;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
for( x = 0; x < gif->frame->Xsize; x++ ) {
|
|
q[0] = p[1];
|
|
q[1] = p[3];
|
|
|
|
q += 2;
|
|
p += 4;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
for( x = 0; x < gif->frame->Xsize; x++ ) {
|
|
q[0] = p[0];
|
|
q[1] = p[1];
|
|
q[2] = p[2];
|
|
|
|
q += 3;
|
|
p += 4;
|
|
}
|
|
break;
|
|
|
|
case 4:
|
|
memcpy( q, p, VIPS_IMAGE_SIZEOF_LINE( gif->frame ) );
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
break;
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_gif_load( VipsForeignLoad *load )
|
|
{
|
|
VipsForeignLoadGifClass *class =
|
|
(VipsForeignLoadGifClass *) VIPS_OBJECT_GET_CLASS( load );
|
|
VipsForeignLoadGif *gif = (VipsForeignLoadGif *) load;
|
|
VipsImage **t = (VipsImage **)
|
|
vips_object_local_array( VIPS_OBJECT( load ), 4 );
|
|
|
|
/* Rewind.
|
|
*/
|
|
if( class->open( gif ) )
|
|
return( -1 );
|
|
|
|
printf( "vips_foreign_load_gif_load:\n" );
|
|
|
|
/* Make the memory image we accumulate pixels in. We always accumulate
|
|
* to RGBA, then trim down to whatever the output image needs on
|
|
* _generate.
|
|
*/
|
|
gif->frame = vips_image_new_memory();
|
|
vips_image_init_fields( gif->frame,
|
|
gif->file->SWidth, gif->file->SHeight, 4, VIPS_FORMAT_UCHAR,
|
|
VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB, 1.0, 1.0 );
|
|
if( vips_image_write_prepare( gif->frame ) )
|
|
return( -1 );
|
|
|
|
/* A copy of the previous state of the frame, in case we have to
|
|
* process a DISPOSE_PREVIOUS.
|
|
*/
|
|
gif->previous = vips_image_new_memory();
|
|
vips_image_init_fields( gif->previous,
|
|
gif->file->SWidth, gif->file->SHeight, 4, VIPS_FORMAT_UCHAR,
|
|
VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB, 1.0, 1.0 );
|
|
if( vips_image_write_prepare( gif->previous ) )
|
|
return( -1 );
|
|
|
|
/* Make the output pipeline.
|
|
*/
|
|
t[0] = vips_image_new();
|
|
if( vips_foreign_load_gif_set_header( gif, t[0] ) )
|
|
return( -1 );
|
|
|
|
/* Strips 8 pixels high to avoid too many tiny regions.
|
|
*/
|
|
if( vips_image_generate( t[0],
|
|
NULL, vips_foreign_load_gif_generate, NULL, gif, NULL ) ||
|
|
vips_sequential( t[0], &t[1],
|
|
"tile_height", VIPS__FATSTRIP_HEIGHT,
|
|
NULL ) ||
|
|
vips_image_write( t[1], load->real ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_gif_open( VipsForeignLoadGif *gif )
|
|
{
|
|
#ifdef HAVE_GIFLIB_5
|
|
{
|
|
int error;
|
|
|
|
if( !(gif->file = DGifOpen( gif->userPtr, gif->read_func, &error )) ) {
|
|
vips_foreign_load_gif_error_vips( gif, error );
|
|
return( -1 );
|
|
}
|
|
}
|
|
#else
|
|
if( !(gif->file = DGifOpen( gif->userPtr, gif->read_func )) ) {
|
|
vips_foreign_load_gif_error_vips( gif, GifLastError() );
|
|
return( -1 );
|
|
}
|
|
#endif
|
|
|
|
gif->eof = FALSE;
|
|
gif->current_page = 0;
|
|
|
|
/* Allocate a line buffer now that we have the GIF width.
|
|
*/
|
|
VIPS_FREE( gif->line )
|
|
if( !(gif->line = VIPS_ARRAY( NULL, gif->file->SWidth, GifPixelType )) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_gif_class_init( VipsForeignLoadGifClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
VipsForeignLoadGifClass *gif_class = (VipsForeignLoadGifClass *) class;
|
|
|
|
gobject_class->dispose = vips_foreign_load_gif_dispose;
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
gif_class->open = vips_foreign_load_gif_open;
|
|
load_class->header = vips_foreign_load_gif_header;
|
|
load_class->load = vips_foreign_load_gif_load;
|
|
|
|
object_class->nickname = "gifload_base";
|
|
object_class->description = _( "load GIF with giflib" );
|
|
|
|
load_class->get_flags_filename =
|
|
vips_foreign_load_gif_get_flags_filename;
|
|
load_class->get_flags = vips_foreign_load_gif_get_flags;
|
|
|
|
VIPS_ARG_INT( class, "page", 20,
|
|
_( "Page" ),
|
|
_( "Load this page from the file" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadGif, page ),
|
|
0, 100000, 0 );
|
|
|
|
VIPS_ARG_INT( class, "n", 21,
|
|
_( "n" ),
|
|
_( "Load this many pages" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadGif, n ),
|
|
-1, 100000, 1 );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_gif_init( VipsForeignLoadGif *gif )
|
|
{
|
|
gif->n = 1;
|
|
gif->transparency = -1;
|
|
gif->delay = 4;
|
|
gif->loop = 0;
|
|
gif->comment = NULL;
|
|
gif->dispose = 0;
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadGifFile {
|
|
VipsForeignLoadGif parent_object;
|
|
|
|
/* Filename for load.
|
|
*/
|
|
char *filename;
|
|
|
|
/* The FILE* we read from.
|
|
*/
|
|
FILE *fp;
|
|
|
|
} VipsForeignLoadGifFile;
|
|
|
|
typedef VipsForeignLoadGifClass VipsForeignLoadGifFileClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadGifFile, vips_foreign_load_gif_file,
|
|
vips_foreign_load_gif_get_type() );
|
|
|
|
static void
|
|
vips_foreign_load_gif_file_dispose( GObject *gobject )
|
|
{
|
|
VipsForeignLoadGifFile *file = (VipsForeignLoadGifFile *) gobject;
|
|
|
|
VIPS_FREEF( fclose, file->fp );
|
|
|
|
G_OBJECT_CLASS( vips_foreign_load_gif_file_parent_class )->
|
|
dispose( gobject );
|
|
}
|
|
|
|
/* Our input function for file open. We can't use DGifOpenFileName(), since
|
|
* that just calls open() and won't work with unicode on win32. We can't use
|
|
* DGifOpenFileHandle() since that's an fd from open() and you can't pass those
|
|
* across DLL boundaries on Windows.
|
|
*/
|
|
static int
|
|
vips_giflib_file_read( GifFileType *file, GifByteType *buffer, int n )
|
|
{
|
|
FILE *fp = (FILE *) file->UserData;
|
|
|
|
return( (int) fread( (void *) buffer, 1, n, fp ) );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_gif_file_open( VipsForeignLoadGif *gif )
|
|
{
|
|
VipsForeignLoad *load = (VipsForeignLoad *) gif;
|
|
VipsForeignLoadGifFile *file = (VipsForeignLoadGifFile *) gif;
|
|
|
|
if( !file->fp ) {
|
|
if( !(file->fp =
|
|
vips__file_open_read( file->filename, NULL, FALSE )) )
|
|
return( -1 );
|
|
|
|
VIPS_SETSTR( load->out->filename, file->filename );
|
|
}
|
|
else
|
|
rewind( file->fp );
|
|
|
|
vips_foreign_load_gif_close( gif );
|
|
gif->userPtr = file->fp;
|
|
gif->read_func = vips_giflib_file_read;
|
|
|
|
return( VIPS_FOREIGN_LOAD_GIF_CLASS(
|
|
vips_foreign_load_gif_file_parent_class )->open( gif ) );
|
|
}
|
|
|
|
static const char *vips_foreign_gif_suffs[] = {
|
|
".gif",
|
|
NULL
|
|
};
|
|
|
|
static void
|
|
vips_foreign_load_gif_file_class_init(
|
|
VipsForeignLoadGifFileClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
VipsForeignLoadGifClass *gif_class = (VipsForeignLoadGifClass *) class;
|
|
|
|
gobject_class->dispose = vips_foreign_load_gif_file_dispose;
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "gifload";
|
|
object_class->description = _( "load GIF with giflib" );
|
|
|
|
foreign_class->suffs = vips_foreign_gif_suffs;
|
|
|
|
load_class->is_a = vips_foreign_load_gif_is_a;
|
|
|
|
gif_class->open = vips_foreign_load_gif_file_open;
|
|
|
|
VIPS_ARG_STRING( class, "filename", 1,
|
|
_( "Filename" ),
|
|
_( "Filename to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadGifFile, filename ),
|
|
NULL );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_gif_file_init( VipsForeignLoadGifFile *file )
|
|
{
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadGifBuffer {
|
|
VipsForeignLoadGif parent_object;
|
|
|
|
/* Load from a buffer.
|
|
*/
|
|
VipsArea *buf;
|
|
|
|
/* Current read point, bytes left in buffer.
|
|
*/
|
|
VipsPel *p;
|
|
size_t bytes_to_go;
|
|
|
|
} VipsForeignLoadGifBuffer;
|
|
|
|
typedef VipsForeignLoadGifClass VipsForeignLoadGifBufferClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadGifBuffer, vips_foreign_load_gif_buffer,
|
|
vips_foreign_load_gif_get_type() );
|
|
|
|
/* Callback from the gif loader.
|
|
*
|
|
* Read up to len bytes into buffer, return number of bytes read, 0 for EOF.
|
|
*/
|
|
static int
|
|
vips_giflib_buffer_read( GifFileType *file, GifByteType *buf, int n )
|
|
{
|
|
VipsForeignLoadGifBuffer *buffer =
|
|
(VipsForeignLoadGifBuffer *) file->UserData;
|
|
size_t will_read = VIPS_MIN( n, buffer->bytes_to_go );
|
|
|
|
memcpy( buf, buffer->p, will_read );
|
|
buffer->p += will_read;
|
|
buffer->bytes_to_go -= will_read;
|
|
|
|
return( will_read );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_gif_buffer_open( VipsForeignLoadGif *gif )
|
|
{
|
|
VipsForeignLoadGifBuffer *buffer = (VipsForeignLoadGifBuffer *) gif;
|
|
|
|
vips_foreign_load_gif_close( gif );
|
|
buffer->p = buffer->buf->data;
|
|
buffer->bytes_to_go = buffer->buf->length;
|
|
gif->userPtr = gif;
|
|
gif->read_func = vips_giflib_buffer_read;;
|
|
|
|
return( VIPS_FOREIGN_LOAD_GIF_CLASS(
|
|
vips_foreign_load_gif_file_parent_class )->open( gif ) );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_gif_buffer_class_init(
|
|
VipsForeignLoadGifBufferClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
VipsForeignLoadGifClass *gif_class = (VipsForeignLoadGifClass *) class;
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "gifload_buffer";
|
|
object_class->description = _( "load GIF with giflib" );
|
|
|
|
load_class->is_a_buffer = vips_foreign_load_gif_is_a_buffer;
|
|
|
|
gif_class->open = vips_foreign_load_gif_buffer_open;
|
|
|
|
VIPS_ARG_BOXED( class, "buffer", 1,
|
|
_( "Buffer" ),
|
|
_( "Buffer to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadGifBuffer, buf ),
|
|
VIPS_TYPE_BLOB );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_gif_buffer_init( VipsForeignLoadGifBuffer *buffer )
|
|
{
|
|
}
|
|
|
|
#endif /*HAVE_GIFLIB*/
|
|
|
|
/**
|
|
* vips_gifload:
|
|
* @filename: file to load
|
|
* @out: (out): output image
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* Optional arguments:
|
|
*
|
|
* * @page: %gint, page (frame) to read
|
|
* * @n: %gint, load this many pages
|
|
*
|
|
* Read a GIF file into a VIPS image.
|
|
*
|
|
* Use @page to select a page to render, numbering from zero.
|
|
*
|
|
* Use @n to select the number of pages to render. The default is 1. Pages are
|
|
* rendered in a vertical column, with each individual page aligned to the
|
|
* left. Set to -1 to mean "until the end of the document". Use vips_grid()
|
|
* to change page layout.
|
|
*
|
|
* The whole GIF is rendered into memory on header access. The output image
|
|
* will be 1, 2, 3 or 4 bands depending on what the reader finds in the file.
|
|
*
|
|
* See also: vips_image_new_from_file().
|
|
*
|
|
* Returns: 0 on success, -1 on error.
|
|
*/
|
|
int
|
|
vips_gifload( const char *filename, VipsImage **out, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "gifload", ap, filename, out );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|
|
|
|
/**
|
|
* vips_gifload_buffer:
|
|
* @buf: (array length=len) (element-type guint8): memory area to load
|
|
* @len: (type gsize): size of memory area
|
|
* @out: (out): image to write
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* Optional arguments:
|
|
*
|
|
* * @page: %gint, page (frame) to read
|
|
* * @n: %gint, load this many pages
|
|
*
|
|
* Read a GIF-formatted memory block into a VIPS image. Exactly as
|
|
* vips_gifload(), but read from a memory buffer.
|
|
*
|
|
* You must not free the buffer while @out is active. The
|
|
* #VipsObject::postclose signal on @out is a good place to free.
|
|
*
|
|
* See also: vips_gifload().
|
|
*
|
|
* Returns: 0 on success, -1 on error.
|
|
*/
|
|
int
|
|
vips_gifload_buffer( void *buf, size_t len, VipsImage **out, ... )
|
|
{
|
|
va_list ap;
|
|
VipsBlob *blob;
|
|
int result;
|
|
|
|
/* We don't take a copy of the data or free it.
|
|
*/
|
|
blob = vips_blob_new( NULL, buf, len );
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "gifload_buffer", ap, blob, out );
|
|
va_end( ap );
|
|
|
|
vips_area_unref( VIPS_AREA( blob ) );
|
|
|
|
return( result );
|
|
}
|
|
|