964 lines
24 KiB
C
964 lines
24 KiB
C
/* load a GIF with libnsgif
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*
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* 6/10/18
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* - from gifload.c
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* 3/3/22 tlsa
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* - update libnsgif API
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*9/5/22
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- attach GIF palette as metadata
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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 VERBOSE
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#define VIPS_DEBUG
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*/
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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 <glib/gi18n-lib.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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/* TODO:
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*
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* - libnsgif does not seem to support comment metadata
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*
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* - it always loads the entire source file into memory
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*
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* Notes:
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*
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* - hard to detect mono images -- local_colour_table in libnsgif is only set
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* when we decode a frame, so we can't tell just from init whether any
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* frames have colour info
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*/
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#ifdef HAVE_NSGIF
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#include <libnsgif/nsgif.h>
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#define VIPS_TYPE_FOREIGN_LOAD_GIF (vips_foreign_load_nsgif_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, VipsForeignLoadNsgif ))
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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, VipsForeignLoadNsgifClass))
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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, VipsForeignLoadNsgifClass ))
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typedef struct _VipsForeignLoadNsgif {
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VipsForeignLoad parent_object;
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/* Load 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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/* Load from this source (set by subclasses).
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*/
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VipsSource *source;
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/* The animation created by libnsgif.
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*/
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nsgif_t *anim;
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/* The data/size pair we pass to libnsgif.
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*/
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unsigned char *data;
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size_t size;
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/* Information about the current GIF.
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*/
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const nsgif_info_t *info;
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/* Delays between frames (in milliseconds). Array of length
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* @info->frame_count.
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*/
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int *delay;
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/* A single centisecond value for compatibility.
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*/
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int gif_delay;
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/* If the GIF contains any frames with transparent elements.
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*/
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gboolean has_transparency;
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/* If the GIF has any local palettes.
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*/
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gboolean local_palette;
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/* The current frame bitmap and the frame number for it.
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*/
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nsgif_bitmap_t *bitmap;
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int frame_number;
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} VipsForeignLoadNsgif;
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typedef VipsForeignLoadClass VipsForeignLoadNsgifClass;
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G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadNsgif, vips_foreign_load_nsgif,
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VIPS_TYPE_FOREIGN_LOAD );
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static void
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vips_foreign_load_nsgif_error( VipsForeignLoadNsgif *gif, nsgif_error result )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( gif );
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vips_error( class->nickname, "%s", nsgif_strerror( result ) );
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}
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static void
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vips_foreign_load_nsgif_dispose( GObject *gobject )
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{
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VipsForeignLoadNsgif *gif = (VipsForeignLoadNsgif *) gobject;
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VIPS_DEBUG_MSG( "vips_foreign_load_nsgif_dispose:\n" );
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if( gif->anim ) {
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nsgif_destroy( gif->anim );
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}
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VIPS_UNREF( gif->source );
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VIPS_FREE( gif->delay );
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G_OBJECT_CLASS( vips_foreign_load_nsgif_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_nsgif_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_nsgif_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_nsgif_is_a_source( VipsSource *source )
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{
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const unsigned char *data;
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if( (data = vips_source_sniff( source, 4 )) &&
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data[0] == 'G' &&
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data[1] == 'I' &&
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data[2] == 'F' &&
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data[3] == '8' )
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return( TRUE );
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return( FALSE );
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}
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#ifdef VERBOSE
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static void
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print_frame( const nsgif_frame_info_t *frame_info )
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{
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if ( frame_info == NULL )
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return;
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printf( "frame_info:\n" );
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printf( " display = %d\n", frame_info->display );
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printf( " local_palette = %d\n", frame_info->local_palette );
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printf( " transparency = %d\n", frame_info->transparency );
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printf( " disposal = %d (%s)\n",
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frame_info->disposal,
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nsgif_str_disposal( frame_info->disposal ) );
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printf( " delay = %d\n", frame_info->delay );
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printf( " rect.x0 = %u\n", frame_info->rect.x0 );
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printf( " rect.y0 = %u\n", frame_info->rect.y0 );
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printf( " rect.x1 = %u\n", frame_info->rect.x1 );
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printf( " rect.y1 = %u\n", frame_info->rect.y1 );
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}
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static void
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print_animation( nsgif_t *anim, const nsgif_info_t *info )
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{
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int i;
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const uint8_t *bg = (uint8_t *) &info->background;
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printf( "animation:\n" );
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printf( " width = %d\n", info->width );
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printf( " height = %d\n", info->height );
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printf( " frame_count = %d\n", info->frame_count );
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printf( " global_palette = %d\n", info->global_palette );
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printf( " loop_max = %d\n", info->loop_max );
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printf( " background = %d %d %d %d\n",
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bg[0], bg[1], bg[2], bg[3] );
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for( i = 0; i < info->frame_count; i++ ) {
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printf( "%d ", i );
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print_frame( nsgif_get_frame_info( anim, i ) );
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}
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}
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#endif /*VERBOSE*/
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static int
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vips_foreign_load_nsgif_set_header( VipsForeignLoadNsgif *gif,
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VipsImage *image )
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{
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double array[3];
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const uint8_t *bg;
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size_t entries;
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uint32_t table[NSGIF_MAX_COLOURS];
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int colours;
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VIPS_DEBUG_MSG( "vips_foreign_load_nsgif_set_header:\n" );
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vips_image_init_fields( image,
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gif->info->width, gif->info->height * gif->n,
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gif->has_transparency ? 4 : 3,
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
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VIPS_INTERPRETATION_sRGB, 1.0, 1.0 );
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vips_image_pipelinev( image, VIPS_DEMAND_STYLE_FATSTRIP, NULL );
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/* Only set page-height if we have more than one page, or this could
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* accidentally turn into an animated image later.
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*/
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if( gif->n > 1 )
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vips_image_set_int( image,
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VIPS_META_PAGE_HEIGHT, gif->info->height );
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vips_image_set_int( image, VIPS_META_N_PAGES,
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gif->info->frame_count );
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vips_image_set_int( image, "loop", gif->info->loop_max );
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vips_image_set_array_int( image, "delay",
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gif->delay, gif->info->frame_count );
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bg = (uint8_t *) &gif->info->background;
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array[0] = bg[0];
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array[1] = bg[1];
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array[2] = bg[2];
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vips_image_set_array_double( image, "background", array, 3 );
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VIPS_SETSTR( image->filename,
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vips_connection_filename( VIPS_CONNECTION( gif->source ) ) );
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/* DEPRECATED "gif-loop"
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*
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* Not the correct behavior as loop=1 became gif-loop=0
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* but we want to keep the old behavior untouched!
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*/
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vips_image_set_int( image,
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"gif-loop", gif->info->loop_max == 0 ?
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0 : gif->info->loop_max - 1 );
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/* The deprecated gif-delay field is in centiseconds.
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*/
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vips_image_set_int( image, "gif-delay", gif->gif_delay );
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/* If there are no local palettes, we can attach the global palette as
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* metadata.
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*/
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if( !gif->local_palette ) {
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nsgif_global_palette( gif->anim, table, &entries );
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vips_image_set_array_int( image, "gif-palette",
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(const int *) table, entries );
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colours = entries;
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}
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else {
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int i;
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colours = 0;
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if( gif->info->global_palette ) {
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nsgif_global_palette( gif->anim, table, &entries );
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colours = entries;
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}
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for( i = 0; i < gif->info->frame_count; i++ ) {
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if( nsgif_local_palette( gif->anim, i, table,
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&entries ) )
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colours = VIPS_MAX( colours, entries );
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}
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}
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vips_image_set_int( image, "palette-bit-depth",
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ceil( log2( colours ) ) );
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return( 0 );
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}
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/* Scan the GIF as quickly as we can and extract transparency, bands, pages,
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* etc.
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*
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* Don't flag any errors unless we have to: we want to work for corrupt or
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* malformed GIFs.
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*
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* Close as soon as we can to free up the fd.
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*/
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static int
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vips_foreign_load_nsgif_header( VipsForeignLoad *load )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( load );
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VipsForeignLoadNsgif *gif = (VipsForeignLoadNsgif *) load;
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const void *data;
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size_t size;
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nsgif_error result;
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int i;
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VIPS_DEBUG_MSG( "vips_foreign_load_nsgif_header:\n" );
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/* We map in the image, then minimise to close any underlying file
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* object. This won't unmap.
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*/
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if( !(data = vips_source_map( gif->source, &size )) )
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return( -1 );
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vips_source_minimise( gif->source );
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result = nsgif_data_scan( gif->anim, size, (void *) data );
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VIPS_DEBUG_MSG( "nsgif_data_scan() = %s\n", nsgif_strerror( result ) );
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gif->info = nsgif_get_info(gif->anim);
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#ifdef VERBOSE
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print_animation( gif->anim, gif->info );
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#endif /*VERBOSE*/
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if( result != NSGIF_OK &&
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load->fail_on >= VIPS_FAIL_ON_WARNING ) {
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vips_foreign_load_nsgif_error( gif, result );
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return( -1 );
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}
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if( !gif->info->frame_count ) {
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vips_error( class->nickname, "%s", _( "no frames in GIF" ) );
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return( -1 );
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}
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/* Check for any transparency.
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*/
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for( i = 0; i < gif->info->frame_count; i++ ) {
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const nsgif_frame_info_t *frame_info;
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if( (frame_info = nsgif_get_frame_info( gif->anim, i )) ) {
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if( frame_info->transparency )
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gif->has_transparency = TRUE;
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if( frame_info->local_palette )
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gif->local_palette = TRUE;
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}
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}
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if( gif->n == -1 )
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gif->n = gif->info->frame_count - gif->page;
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if( gif->page < 0 ||
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gif->n <= 0 ||
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gif->page + gif->n > gif->info->frame_count ) {
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vips_error( class->nickname, "%s", _( "bad page number" ) );
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return( -1 );
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}
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/* In ms, frame_delay in cs.
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*/
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VIPS_FREE( gif->delay );
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if( !(gif->delay = VIPS_ARRAY( NULL,
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gif->info->frame_count, int )) )
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return( -1 );
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for( i = 0; i < gif->info->frame_count; i++ ) {
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const nsgif_frame_info_t *frame_info;
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frame_info = nsgif_get_frame_info( gif->anim, i );
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if ( frame_info == NULL ) {
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vips_error( class->nickname, "%s", _( "bad frame" ) );
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return( -1 );
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}
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gif->delay[i] = 10 * frame_info->delay;
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}
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gif->gif_delay = gif->delay[0] / 10;
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vips_foreign_load_nsgif_set_header( gif, load->out );
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return( 0 );
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}
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static int
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vips_foreign_load_nsgif_generate( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRect *r = &or->valid;
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VipsForeignLoadNsgif *gif = (VipsForeignLoadNsgif *) a;
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int y;
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#ifdef VERBOSE
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VIPS_DEBUG_MSG( "vips_foreign_load_nsgif_generate: "
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"top = %d, height = %d\n", r->top, r->height );
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#endif /*VERBOSE*/
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for( y = 0; y < r->height; y++ ) {
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/* The page for this output line, and the line number in page.
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*/
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int page = (r->top + y) / gif->info->height + gif->page;
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int line = (r->top + y) % gif->info->height;
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nsgif_error result;
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VipsPel *p, *q;
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g_assert( line >= 0 && line < gif->info->height );
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g_assert( page >= 0 && page < gif->info->frame_count );
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if( gif->frame_number != page ) {
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result = nsgif_frame_decode( gif->anim,
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page, &gif->bitmap );
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VIPS_DEBUG_MSG( " nsgif_frame_decode(%d) = %d\n",
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page, result );
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if( result != NSGIF_OK ) {
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vips_foreign_load_nsgif_error( gif, result );
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return( -1 );
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}
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#ifdef VERBOSE
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print_frame( nsgif_get_frame_info( gif->anim, page ) );
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#endif /*VERBOSE*/
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gif->frame_number = page;
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}
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p = gif->bitmap + line * gif->info->width * sizeof( int );
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q = VIPS_REGION_ADDR( or, 0, r->top + y );
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if( gif->has_transparency )
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memcpy( q, p, VIPS_REGION_SIZEOF_LINE( or ) );
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else {
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int i;
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for( i = 0; i < r->width; i++ ) {
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q[0] = p[0];
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q[1] = p[1];
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q[2] = p[2];
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q += 3;
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p += 4;
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}
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}
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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_nsgif_load( VipsForeignLoad *load )
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{
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VipsForeignLoadNsgif *gif = (VipsForeignLoadNsgif *) load;
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VipsImage **t = (VipsImage **)
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vips_object_local_array( VIPS_OBJECT( load ), 4 );
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VIPS_DEBUG_MSG( "vips_foreign_load_nsgif_load:\n" );
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/* Make the output pipeline.
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*/
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t[0] = vips_image_new();
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if( vips_foreign_load_nsgif_set_header( gif, t[0] ) )
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return( -1 );
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/* Strips 8 pixels high to avoid too many tiny regions.
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*/
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if( vips_image_generate( t[0],
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NULL, vips_foreign_load_nsgif_generate, NULL, gif, NULL ) ||
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vips_sequential( t[0], &t[1],
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"tile_height", VIPS__FATSTRIP_HEIGHT,
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NULL ) ||
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vips_image_write( t[1], load->real ) )
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return( -1 );
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|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_class_init( VipsForeignLoadNsgifClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->dispose = vips_foreign_load_nsgif_dispose;
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "gifload_base";
|
|
object_class->description = _( "load GIF with libnsgif" );
|
|
|
|
/* High priority, so that we handle vipsheader etc.
|
|
*/
|
|
foreign_class->priority = 50;
|
|
|
|
load_class->get_flags_filename =
|
|
vips_foreign_load_nsgif_get_flags_filename;
|
|
load_class->get_flags = vips_foreign_load_nsgif_get_flags;
|
|
load_class->header = vips_foreign_load_nsgif_header;
|
|
load_class->load = vips_foreign_load_nsgif_load;
|
|
|
|
VIPS_ARG_INT( class, "page", 10,
|
|
_( "Page" ),
|
|
_( "Load this page from the file" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadNsgif, page ),
|
|
0, 100000, 0 );
|
|
|
|
VIPS_ARG_INT( class, "n", 6,
|
|
_( "n" ),
|
|
_( "Load this many pages" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadNsgif, n ),
|
|
-1, 100000, 1 );
|
|
|
|
}
|
|
|
|
static void *
|
|
vips_foreign_load_nsgif_bitmap_create( int width, int height )
|
|
{
|
|
/* GIF has a limit of 64k per axis -- double-check this.
|
|
*/
|
|
if( width <= 0 ||
|
|
width > 65536 ||
|
|
height <= 0 ||
|
|
height > 65536 ) {
|
|
vips_error( "gifload",
|
|
"%s", _( "bad image dimensions") );
|
|
return( NULL );
|
|
}
|
|
|
|
return g_malloc0( (gsize) width * height * 4 );
|
|
}
|
|
|
|
static unsigned char *
|
|
vips_foreign_load_nsgif_bitmap_get_buffer( void *bitmap )
|
|
{
|
|
g_assert( bitmap );
|
|
|
|
return( bitmap );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_bitmap_destroy( void *bitmap )
|
|
{
|
|
g_assert( bitmap );
|
|
g_free( bitmap );
|
|
}
|
|
|
|
static nsgif_bitmap_cb_vt vips_foreign_load_nsgif_bitmap_callbacks = {
|
|
vips_foreign_load_nsgif_bitmap_create,
|
|
vips_foreign_load_nsgif_bitmap_destroy,
|
|
vips_foreign_load_nsgif_bitmap_get_buffer,
|
|
};
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_init( VipsForeignLoadNsgif *gif )
|
|
{
|
|
nsgif_error result = nsgif_create(
|
|
&vips_foreign_load_nsgif_bitmap_callbacks,
|
|
NSGIF_BITMAP_FMT_R8G8B8A8,
|
|
&gif->anim );
|
|
if (result != NSGIF_OK) {
|
|
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( gif );
|
|
vips_error( class->nickname, "%s",
|
|
nsgif_strerror( result ) );
|
|
return;
|
|
}
|
|
|
|
gif->n = 1;
|
|
gif->frame_number = -1;
|
|
gif->bitmap = NULL;
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadNsgifFile {
|
|
VipsForeignLoadNsgif parent_object;
|
|
|
|
/* Filename for load.
|
|
*/
|
|
char *filename;
|
|
|
|
} VipsForeignLoadNsgifFile;
|
|
|
|
typedef VipsForeignLoadNsgifClass VipsForeignLoadNsgifFileClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadNsgifFile, vips_foreign_load_nsgif_file,
|
|
vips_foreign_load_nsgif_get_type() );
|
|
|
|
static int
|
|
vips_foreign_load_gif_file_build( VipsObject *object )
|
|
{
|
|
VipsForeignLoadNsgif *gif = (VipsForeignLoadNsgif *) object;
|
|
VipsForeignLoadNsgifFile *file = (VipsForeignLoadNsgifFile *) object;
|
|
|
|
if( file->filename )
|
|
if( !(gif->source =
|
|
vips_source_new_from_file( file->filename )) )
|
|
return( -1 );
|
|
|
|
if( VIPS_OBJECT_CLASS( vips_foreign_load_nsgif_file_parent_class )->
|
|
build( object ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static const char *vips_foreign_nsgif_suffs[] = {
|
|
".gif",
|
|
NULL
|
|
};
|
|
|
|
static gboolean
|
|
vips_foreign_load_nsgif_file_is_a( const char *filename )
|
|
{
|
|
VipsSource *source;
|
|
gboolean result;
|
|
|
|
if( !(source = vips_source_new_from_file( filename )) )
|
|
return( FALSE );
|
|
result = vips_foreign_load_nsgif_is_a_source( source );
|
|
VIPS_UNREF( source );
|
|
|
|
return( result );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_file_class_init(
|
|
VipsForeignLoadNsgifFileClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
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 libnsgif" );
|
|
object_class->build = vips_foreign_load_gif_file_build;
|
|
|
|
foreign_class->suffs = vips_foreign_nsgif_suffs;
|
|
|
|
load_class->is_a = vips_foreign_load_nsgif_file_is_a;
|
|
|
|
VIPS_ARG_STRING( class, "filename", 1,
|
|
_( "Filename" ),
|
|
_( "Filename to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadNsgifFile, filename ),
|
|
NULL );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_file_init( VipsForeignLoadNsgifFile *file )
|
|
{
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadNsgifBuffer {
|
|
VipsForeignLoadNsgif parent_object;
|
|
|
|
/* Load from a buffer.
|
|
*/
|
|
VipsArea *blob;
|
|
|
|
} VipsForeignLoadNsgifBuffer;
|
|
|
|
typedef VipsForeignLoadNsgifClass VipsForeignLoadNsgifBufferClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadNsgifBuffer, vips_foreign_load_nsgif_buffer,
|
|
vips_foreign_load_nsgif_get_type() );
|
|
|
|
static int
|
|
vips_foreign_load_nsgif_buffer_build( VipsObject *object )
|
|
{
|
|
VipsForeignLoadNsgif *gif = (VipsForeignLoadNsgif *) object;
|
|
VipsForeignLoadNsgifBuffer *buffer =
|
|
(VipsForeignLoadNsgifBuffer *) object;
|
|
|
|
if( buffer->blob &&
|
|
!(gif->source = vips_source_new_from_memory(
|
|
buffer->blob->data,
|
|
buffer->blob->length )) )
|
|
return( -1 );
|
|
|
|
if( VIPS_OBJECT_CLASS( vips_foreign_load_nsgif_buffer_parent_class )->
|
|
build( object ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static gboolean
|
|
vips_foreign_load_nsgif_buffer_is_a_buffer( const void *buf, size_t len )
|
|
{
|
|
VipsSource *source;
|
|
gboolean result;
|
|
|
|
if( !(source = vips_source_new_from_memory( buf, len )) )
|
|
return( FALSE );
|
|
result = vips_foreign_load_nsgif_is_a_source( source );
|
|
VIPS_UNREF( source );
|
|
|
|
return( result );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_buffer_class_init(
|
|
VipsForeignLoadNsgifBufferClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) 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 libnsgif" );
|
|
object_class->build = vips_foreign_load_nsgif_buffer_build;
|
|
|
|
load_class->is_a_buffer = vips_foreign_load_nsgif_buffer_is_a_buffer;
|
|
|
|
VIPS_ARG_BOXED( class, "buffer", 1,
|
|
_( "Buffer" ),
|
|
_( "Buffer to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadNsgifBuffer, blob ),
|
|
VIPS_TYPE_BLOB );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_buffer_init( VipsForeignLoadNsgifBuffer *buffer )
|
|
{
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadNsgifSource {
|
|
VipsForeignLoadNsgif parent_object;
|
|
|
|
/* Load from a source.
|
|
*/
|
|
VipsSource *source;
|
|
|
|
} VipsForeignLoadNsgifSource;
|
|
|
|
typedef VipsForeignLoadClass VipsForeignLoadNsgifSourceClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadNsgifSource, vips_foreign_load_nsgif_source,
|
|
vips_foreign_load_nsgif_get_type() );
|
|
|
|
static int
|
|
vips_foreign_load_nsgif_source_build( VipsObject *object )
|
|
{
|
|
VipsForeignLoadNsgif *gif = (VipsForeignLoadNsgif *) object;
|
|
VipsForeignLoadNsgifSource *source =
|
|
(VipsForeignLoadNsgifSource *) object;
|
|
|
|
if( source->source ) {
|
|
gif->source = source->source;
|
|
g_object_ref( gif->source );
|
|
}
|
|
|
|
if( VIPS_OBJECT_CLASS( vips_foreign_load_nsgif_source_parent_class )->
|
|
build( object ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_source_class_init(
|
|
VipsForeignLoadNsgifSourceClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "gifload_source";
|
|
object_class->description = _( "load gif from source" );
|
|
object_class->build = vips_foreign_load_nsgif_source_build;
|
|
|
|
operation_class->flags = VIPS_OPERATION_NOCACHE;
|
|
|
|
load_class->is_a_source = vips_foreign_load_nsgif_is_a_source;
|
|
|
|
VIPS_ARG_OBJECT( class, "source", 1,
|
|
_( "Source" ),
|
|
_( "Source to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadNsgifSource, source ),
|
|
VIPS_TYPE_SOURCE );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_nsgif_source_init( VipsForeignLoadNsgifSource *source )
|
|
{
|
|
}
|
|
|
|
#endif /*HAVE_NSGIF*/
|
|
|
|
/**
|
|
* 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
|
|
* * @fail_on: #VipsFailOn, types of read error to fail on
|
|
*
|
|
* Read a GIF file into a libvips 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. Set to -1 to mean "until the end of the
|
|
* document". Use vips_grid() to change page layout.
|
|
*
|
|
* Use @fail_on to set the type of error that will cause load to fail. By
|
|
* default, loaders are permissive, that is, #VIPS_FAIL_ON_NONE.
|
|
*
|
|
* The output image is RGBA for GIFs containing transparent elements, RGB
|
|
* otherwise.
|
|
*
|
|
* 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
|
|
* * @fail_on: #VipsFailOn, types of read error to fail on
|
|
*
|
|
* 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 );
|
|
}
|
|
|
|
/**
|
|
* vips_gifload_source:
|
|
* @source: source to load
|
|
* @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
|
|
* * @fail_on: #VipsFailOn, types of read error to fail on
|
|
*
|
|
* Exactly as vips_gifload(), but read from a source.
|
|
*
|
|
* See also: vips_gifload().
|
|
*
|
|
* Returns: 0 on success, -1 on error.
|
|
*/
|
|
int
|
|
vips_gifload_source( VipsSource *source, VipsImage **out, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "gifload_source", ap, source, out );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|