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libvips/libvips/foreign/webpsave.c
Felix Bünemann 0a25f6efca Add alpha_q(uality) webpsave option, fix Q init 
This allows to control the fidelity of the alpha channel by allowing
webp to reduce the number of palette entries from 256 at alpha_q=100
to 2 at alpha_q=0. This is most useful with cutout pictures where
something like alpha_q=30 or around 8 levels is usually sufficient
for smooth outlines.

For some reason webp->Q was intiailized to 80 even though the Q option
and libwebp use 75 by default. This was never used, so it's just to
avoid confusion about what default is used.
2016-04-24 18:18:40 +02:00

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/* save to webp
*
* 24/11/11
* - wrap a class around the webp writer
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define DEBUG_VERBOSE
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#ifdef HAVE_LIBWEBP
#include <stdlib.h>
#include <vips/vips.h>
#include "webp.h"
typedef struct _VipsForeignSaveWebp {
VipsForeignSave parent_object;
/* Quality factor.
*/
int Q;
/* Turn on lossless encode.
*/
gboolean lossless;
/* Lossy compression preset.
*/
VipsForeignWebpPreset preset;
/* Enable smart chroma subsampling.
*/
gboolean smart_subsample;
/* Use preprocessing in lossless mode.
*/
gboolean near_lossless;
/* Alpha quality.
*/
int alpha_q;
} VipsForeignSaveWebp;
typedef VipsForeignSaveClass VipsForeignSaveWebpClass;
G_DEFINE_ABSTRACT_TYPE( VipsForeignSaveWebp, vips_foreign_save_webp,
VIPS_TYPE_FOREIGN_SAVE );
#define UC VIPS_FORMAT_UCHAR
/* Type promotion for save ... just always go to uchar.
*/
static int bandfmt_webp[10] = {
/* UC C US S UI I F X D DX */
UC, UC, UC, UC, UC, UC, UC, UC, UC, UC
};
static void
vips_foreign_save_webp_class_init( VipsForeignSaveWebpClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsForeignSaveClass *save_class = (VipsForeignSaveClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "webpsave_base";
object_class->description = _( "save webp" );
foreign_class->suffs = vips__webp_suffs;
save_class->saveable = VIPS_SAVEABLE_RGBA_ONLY;
save_class->format_table = bandfmt_webp;
VIPS_ARG_INT( class, "Q", 10,
_( "Q" ),
_( "Q factor" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebp, Q ),
0, 100, 75 );
VIPS_ARG_BOOL( class, "lossless", 11,
_( "lossless" ),
_( "enable lossless compression" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebp, lossless ),
FALSE );
VIPS_ARG_ENUM( class, "preset", 12,
_( "preset" ),
_( "Preset for lossy compression" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebp, preset ),
VIPS_TYPE_FOREIGN_WEBP_PRESET,
VIPS_FOREIGN_WEBP_PRESET_DEFAULT );
VIPS_ARG_BOOL( class, "smart_subsample", 13,
_( "Smart subsampling" ),
_( "Enable high quality chroma subsampling" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebp, smart_subsample ),
FALSE );
VIPS_ARG_BOOL( class, "near_lossless", 14,
_( "Near lossless" ),
_( "Enable preprocessing in lossless mode (uses Q)" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebp, near_lossless ),
FALSE );
VIPS_ARG_INT( class, "alpha_q", 15,
_( "Alpha quality" ),
_( "Change alpha plane fidelity for lossy compression" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebp, alpha_q ),
0, 100, 100 );
}
static void
vips_foreign_save_webp_init( VipsForeignSaveWebp *webp )
{
webp->Q = 75;
}
typedef struct _VipsForeignSaveWebpFile {
VipsForeignSaveWebp parent_object;
/* Filename for save.
*/
char *filename;
} VipsForeignSaveWebpFile;
typedef VipsForeignSaveWebpClass VipsForeignSaveWebpFileClass;
G_DEFINE_TYPE( VipsForeignSaveWebpFile, vips_foreign_save_webp_file,
vips_foreign_save_webp_get_type() );
static int
vips_foreign_save_webp_file_build( VipsObject *object )
{
VipsForeignSave *save = (VipsForeignSave *) object;
VipsForeignSaveWebp *webp = (VipsForeignSaveWebp *) object;
VipsForeignSaveWebpFile *file = (VipsForeignSaveWebpFile *) object;
if( VIPS_OBJECT_CLASS( vips_foreign_save_webp_file_parent_class )->
build( object ) )
return( -1 );
if( vips__webp_write_file( save->ready, file->filename,
webp->Q, webp->lossless, webp->preset,
webp->smart_subsample, webp->near_lossless,
webp->alpha_q ) )
return( -1 );
return( 0 );
}
static void
vips_foreign_save_webp_file_class_init( VipsForeignSaveWebpFileClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "webpsave";
object_class->description = _( "save image to webp file" );
object_class->build = vips_foreign_save_webp_file_build;
VIPS_ARG_STRING( class, "filename", 1,
_( "Filename" ),
_( "Filename to save to" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebpFile, filename ),
NULL );
}
static void
vips_foreign_save_webp_file_init( VipsForeignSaveWebpFile *file )
{
}
typedef struct _VipsForeignSaveWebpBuffer {
VipsForeignSaveWebp parent_object;
/* Save to a buffer.
*/
VipsArea *buf;
} VipsForeignSaveWebpBuffer;
typedef VipsForeignSaveWebpClass VipsForeignSaveWebpBufferClass;
G_DEFINE_TYPE( VipsForeignSaveWebpBuffer, vips_foreign_save_webp_buffer,
vips_foreign_save_webp_get_type() );
static int
vips_foreign_save_webp_buffer_build( VipsObject *object )
{
VipsForeignSave *save = (VipsForeignSave *) object;
VipsForeignSaveWebp *webp = (VipsForeignSaveWebp *) object;
VipsForeignSaveWebpBuffer *file = (VipsForeignSaveWebpBuffer *) object;
void *obuf;
size_t olen;
VipsBlob *blob;
if( VIPS_OBJECT_CLASS( vips_foreign_save_webp_buffer_parent_class )->
build( object ) )
return( -1 );
if( vips__webp_write_buffer( save->ready, &obuf, &olen,
webp->Q, webp->lossless, webp->preset,
webp->smart_subsample, webp->near_lossless,
webp->alpha_q ) )
return( -1 );
blob = vips_blob_new( (VipsCallbackFn) vips_free, obuf, olen );
g_object_set( file, "buffer", blob, NULL );
vips_area_unref( VIPS_AREA( blob ) );
return( 0 );
}
static void
vips_foreign_save_webp_buffer_class_init(
VipsForeignSaveWebpBufferClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "webpsave_buffer";
object_class->description = _( "save image to webp buffer" );
object_class->build = vips_foreign_save_webp_buffer_build;
VIPS_ARG_BOXED( class, "buffer", 1,
_( "Buffer" ),
_( "Buffer to save to" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebpBuffer, buf ),
VIPS_TYPE_BLOB );
}
static void
vips_foreign_save_webp_buffer_init( VipsForeignSaveWebpBuffer *file )
{
}
typedef struct _VipsForeignSaveWebpMime {
VipsForeignSaveWebp parent_object;
} VipsForeignSaveWebpMime;
typedef VipsForeignSaveWebpClass VipsForeignSaveWebpMimeClass;
G_DEFINE_TYPE( VipsForeignSaveWebpMime, vips_foreign_save_webp_mime,
vips_foreign_save_webp_get_type() );
static int
vips_foreign_save_webp_mime_build( VipsObject *object )
{
VipsForeignSave *save = (VipsForeignSave *) object;
VipsForeignSaveWebp *webp = (VipsForeignSaveWebp *) object;
void *obuf;
size_t olen;
if( VIPS_OBJECT_CLASS( vips_foreign_save_webp_mime_parent_class )->
build( object ) )
return( -1 );
if( vips__webp_write_buffer( save->ready, &obuf, &olen,
webp->Q, webp->lossless, webp->preset,
webp->smart_subsample, webp->near_lossless,
webp->alpha_q ) )
return( -1 );
printf( "Content-length: %zu\r\n", olen );
printf( "Content-type: image/webp\r\n" );
printf( "\r\n" );
if( fwrite( obuf, sizeof( char ), olen, stdout ) != olen ) {
vips_error( "VipsWebp", "%s", _( "error writing output" ) );
return( -1 );
}
fflush( stdout );
g_free( obuf );
return( 0 );
}
static void
vips_foreign_save_webp_mime_class_init( VipsForeignSaveWebpMimeClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
object_class->nickname = "webpsave_mime";
object_class->description = _( "save image to webp mime" );
object_class->build = vips_foreign_save_webp_mime_build;
}
static void
vips_foreign_save_webp_mime_init( VipsForeignSaveWebpMime *mime )
{
}
#endif /*HAVE_LIBWEBP*/
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