481 lines
12 KiB
C
481 lines
12 KiB
C
/* load png from a file
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*
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* 5/12/11
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* - from tiffload.c
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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
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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 <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 <vips/vips.h>
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#include <vips/buf.h>
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#include <vips/internal.h>
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#include "pforeign.h"
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#ifdef HAVE_PNG
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typedef struct _VipsForeignLoadPng {
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VipsForeignLoad parent_object;
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/* Set by subclasses.
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*/
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VipsSource *source;
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} VipsForeignLoadPng;
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typedef VipsForeignLoadClass VipsForeignLoadPngClass;
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G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadPng, vips_foreign_load_png,
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VIPS_TYPE_FOREIGN_LOAD );
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static void
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vips_foreign_load_png_dispose( GObject *gobject )
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{
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VipsForeignLoadPng *png = (VipsForeignLoadPng *) gobject;
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VIPS_UNREF( png->source );
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G_OBJECT_CLASS( vips_foreign_load_png_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_png_get_flags_source( VipsSource *source )
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{
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VipsForeignFlags flags;
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flags = 0;
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if( vips__png_isinterlaced_source( source ) )
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flags |= VIPS_FOREIGN_PARTIAL;
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else
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flags |= VIPS_FOREIGN_SEQUENTIAL;
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return( flags );
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}
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static VipsForeignFlags
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vips_foreign_load_png_get_flags( VipsForeignLoad *load )
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{
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VipsForeignLoadPng *png = (VipsForeignLoadPng *) load;
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return( vips_foreign_load_png_get_flags_source( png->source ) );
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}
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static VipsForeignFlags
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vips_foreign_load_png_get_flags_filename( const char *filename )
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{
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VipsSource *source;
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VipsForeignFlags flags;
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if( !(source = vips_source_new_from_file( filename )) )
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return( 0 );
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flags = vips_foreign_load_png_get_flags_source( source );
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VIPS_UNREF( source );
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return( flags );
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}
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static int
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vips_foreign_load_png_header( VipsForeignLoad *load )
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{
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VipsForeignLoadPng *png = (VipsForeignLoadPng *) load;
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if( vips__png_header_source( png->source, load->out ) )
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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_png_load( VipsForeignLoad *load )
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{
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VipsForeignLoadPng *png = (VipsForeignLoadPng *) load;
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if( vips__png_read_source( png->source, load->real, load->fail ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_foreign_load_png_class_init( VipsForeignLoadPngClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsForeignClass *foreign_class = (VipsForeignClass *) class;
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VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
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gobject_class->dispose = vips_foreign_load_png_dispose;
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object_class->nickname = "pngload_base";
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object_class->description = _( "load png base class" );
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/* We are fast at is_a(), so high priority.
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*/
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foreign_class->priority = 200;
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load_class->get_flags_filename =
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vips_foreign_load_png_get_flags_filename;
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load_class->get_flags = vips_foreign_load_png_get_flags;
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load_class->header = vips_foreign_load_png_header;
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load_class->load = vips_foreign_load_png_load;
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}
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static void
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vips_foreign_load_png_init( VipsForeignLoadPng *png )
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{
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}
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typedef struct _VipsForeignLoadPngSource {
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VipsForeignLoadPng parent_object;
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/* Load from a source.
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*/
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VipsSource *source;
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} VipsForeignLoadPngSource;
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typedef VipsForeignLoadPngClass VipsForeignLoadPngSourceClass;
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G_DEFINE_TYPE( VipsForeignLoadPngSource, vips_foreign_load_png_source,
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vips_foreign_load_png_get_type() );
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static int
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vips_foreign_load_png_source_build( VipsObject *object )
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{
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VipsForeignLoadPng *png = (VipsForeignLoadPng *) object;
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VipsForeignLoadPngSource *source = (VipsForeignLoadPngSource *) object;
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if( source->source ) {
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png->source = source->source;
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g_object_ref( png->source );
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}
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if( VIPS_OBJECT_CLASS( vips_foreign_load_png_source_parent_class )->
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build( object ) )
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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_png_source_is_a_source( VipsSource *source )
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{
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return( vips__png_ispng_source( source ) );
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}
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static void
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vips_foreign_load_png_source_class_init( VipsForeignLoadPngSourceClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "pngload_source";
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object_class->description = _( "load png from source" );
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object_class->build = vips_foreign_load_png_source_build;
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load_class->is_a_source = vips_foreign_load_png_source_is_a_source;
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VIPS_ARG_OBJECT( class, "source", 1,
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_( "Source" ),
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_( "Source to load from" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsForeignLoadPngSource, source ),
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VIPS_TYPE_SOURCE );
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}
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static void
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vips_foreign_load_png_source_init( VipsForeignLoadPngSource *source )
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{
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}
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typedef struct _VipsForeignLoadPngFile {
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VipsForeignLoadPng parent_object;
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/* Filename for load.
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*/
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char *filename;
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} VipsForeignLoadPngFile;
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typedef VipsForeignLoadPngClass VipsForeignLoadPngFileClass;
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G_DEFINE_TYPE( VipsForeignLoadPngFile, vips_foreign_load_png_file,
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vips_foreign_load_png_get_type() );
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static int
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vips_foreign_load_png_file_build( VipsObject *object )
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{
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VipsForeignLoadPng *png = (VipsForeignLoadPng *) object;
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VipsForeignLoadPngFile *file = (VipsForeignLoadPngFile *) object;
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if( file->filename &&
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!(png->source = vips_source_new_from_file( file->filename )) )
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return( -1 );
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if( VIPS_OBJECT_CLASS( vips_foreign_load_png_file_parent_class )->
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build( object ) )
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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_png_file_is_a( const char *filename )
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{
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VipsSource *source;
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gboolean result;
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if( !(source = vips_source_new_from_file( filename )) )
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return( FALSE );
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result = vips_foreign_load_png_source_is_a_source( source );
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VIPS_UNREF( source );
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return( result );
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}
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static void
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vips_foreign_load_png_file_class_init( VipsForeignLoadPngFileClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsForeignClass *foreign_class = (VipsForeignClass *) class;
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VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "pngload";
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object_class->description = _( "load png from file" );
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object_class->build = vips_foreign_load_png_file_build;
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foreign_class->suffs = vips__png_suffs;
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load_class->is_a = vips_foreign_load_png_file_is_a;
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VIPS_ARG_STRING( class, "filename", 1,
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_( "Filename" ),
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_( "Filename to load from" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsForeignLoadPngFile, filename ),
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NULL );
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}
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static void
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vips_foreign_load_png_file_init( VipsForeignLoadPngFile *file )
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{
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}
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typedef struct _VipsForeignLoadPngBuffer {
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VipsForeignLoadPng parent_object;
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/* Load from a buffer.
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*/
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VipsBlob *blob;
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} VipsForeignLoadPngBuffer;
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typedef VipsForeignLoadPngClass VipsForeignLoadPngBufferClass;
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G_DEFINE_TYPE( VipsForeignLoadPngBuffer, vips_foreign_load_png_buffer,
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vips_foreign_load_png_get_type() );
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static int
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vips_foreign_load_png_buffer_build( VipsObject *object )
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{
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VipsForeignLoadPng *png = (VipsForeignLoadPng *) object;
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VipsForeignLoadPngBuffer *buffer = (VipsForeignLoadPngBuffer *) object;
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if( buffer->blob &&
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!(png->source = vips_source_new_from_memory(
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VIPS_AREA( buffer->blob )->data,
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VIPS_AREA( buffer->blob )->length )) )
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return( -1 );
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if( VIPS_OBJECT_CLASS( vips_foreign_load_png_buffer_parent_class )->
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build( object ) )
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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_png_buffer_is_a_buffer( const void *buf, size_t len )
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{
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VipsSource *source;
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gboolean result;
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if( !(source = vips_source_new_from_memory( buf, len )) )
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return( FALSE );
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result = vips_foreign_load_png_source_is_a_source( source );
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VIPS_UNREF( source );
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return( result );
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}
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static void
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vips_foreign_load_png_buffer_class_init( VipsForeignLoadPngBufferClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "pngload_buffer";
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object_class->description = _( "load png from buffer" );
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object_class->build = vips_foreign_load_png_buffer_build;
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load_class->is_a_buffer = vips_foreign_load_png_buffer_is_a_buffer;
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VIPS_ARG_BOXED( class, "buffer", 1,
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_( "Buffer" ),
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_( "Buffer to load from" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsForeignLoadPngBuffer, blob ),
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VIPS_TYPE_BLOB );
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}
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static void
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vips_foreign_load_png_buffer_init( VipsForeignLoadPngBuffer *buffer )
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{
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}
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#endif /*HAVE_PNG*/
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/**
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* vips_pngload:
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* @filename: file to load
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* @out: (out): decompressed image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Read a PNG file into a VIPS image. It can read all png images, including 8-
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* and 16-bit images, 1 and 3 channel, with and without an alpha channel.
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*
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* Any ICC profile is read and attached to the VIPS image. It also supports
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* XMP metadata.
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*
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* See also: vips_image_new_from_file().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_pngload( const char *filename, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "pngload", ap, filename, out );
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va_end( ap );
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return( result );
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}
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/**
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* vips_pngload_buffer:
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* @buf: (array length=len) (element-type guint8): memory area to load
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* @len: (type gsize): size of memory area
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* @out: (out): image to write
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* @...: %NULL-terminated list of optional named arguments
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*
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* Exactly as vips_pngload(), but read from a PNG-formatted memory block.
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*
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* You must not free the buffer while @out is active. The
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* #VipsObject::postclose signal on @out is a good place to free.
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*
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* See also: vips_pngload().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_pngload_buffer( void *buf, size_t len, VipsImage **out, ... )
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{
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va_list ap;
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VipsBlob *blob;
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int result;
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/* We don't take a copy of the data or free it.
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*/
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blob = vips_blob_new( NULL, buf, len );
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va_start( ap, out );
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result = vips_call_split( "pngload_buffer", ap, blob, out );
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va_end( ap );
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vips_area_unref( VIPS_AREA( blob ) );
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return( result );
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}
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/**
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* vips_pngload_source:
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* @source: source to load from
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* @out: (out): image to write
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* @...: %NULL-terminated list of optional named arguments
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*
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* Exactly as vips_pngload(), but read from a source.
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*
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* See also: vips_pngload().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_pngload_source( VipsSource *source, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "pngload_source", ap, source, out );
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va_end( ap );
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return( result );
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}
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