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support webp lossless encoding

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This commit is contained in:
John Cupitt 2013-08-06 21:56:31 +01:00
parent ea3b2e3ef1
commit 3d14709bdb
3 changed files with 60 additions and 18 deletions
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52
libvips/foreign/vips2webp.c
View File

@ -55,10 +55,13 @@ typedef size_t (*webp_encoder)( const uint8_t *rgb,
int width, int height, int stride,
float quality_factor, uint8_t **output );
typedef size_t (*webp_encoder_lossless)( const uint8_t *rgb,
int width, int height, int stride, uint8_t **output );
int
vips__webp_write_file( VipsImage *in, const char *filename, int Q )
vips__webp_write_file( VipsImage *in, const char *filename,
int Q, gboolean lossless )
{
webp_encoder encoder;
size_t len;
uint8_t *buffer;
FILE *fp;
@ -66,17 +69,39 @@ vips__webp_write_file( VipsImage *in, const char *filename, int Q )
if( vips_image_wio_input( in ) )
return( -1 );
if( in->Bands == 4 )
encoder = WebPEncodeRGBA;
else
encoder = WebPEncodeRGB;
if( lossless ) {
webp_encoder_lossless encoder;
if( !(len = encoder( VIPS_IMAGE_ADDR( in, 0, 0 ),
in->Xsize, in->Ysize,
VIPS_IMAGE_SIZEOF_LINE( in ),
Q, &buffer )) ) {
vips_error( "vips2webp", "%s", _( "unable to encode" ) );
return( -1 );
if( in->Bands == 4 )
encoder = WebPEncodeLosslessRGBA;
else
encoder = WebPEncodeLosslessRGB;
if( !(len = encoder( VIPS_IMAGE_ADDR( in, 0, 0 ),
in->Xsize, in->Ysize,
VIPS_IMAGE_SIZEOF_LINE( in ),
&buffer )) ) {
vips_error( "vips2webp",
"%s", _( "unable to encode" ) );
return( -1 );
}
}
else {
webp_encoder encoder;
if( in->Bands == 4 )
encoder = WebPEncodeRGBA;
else
encoder = WebPEncodeRGB;
if( !(len = encoder( VIPS_IMAGE_ADDR( in, 0, 0 ),
in->Xsize, in->Ysize,
VIPS_IMAGE_SIZEOF_LINE( in ),
Q, &buffer )) ) {
vips_error( "vips2webp",
"%s", _( "unable to encode" ) );
return( -1 );
}
}
if( !(fp = vips__file_open_write( filename, FALSE )) ) {
@ -97,7 +122,8 @@ vips__webp_write_file( VipsImage *in, const char *filename, int Q )
}
int
vips__webp_write_buffer( VipsImage *in, void **obuf, size_t *olen, int Q )
vips__webp_write_buffer( VipsImage *in, void **obuf, size_t *olen,
int Q, gboolean lossless )
{
webp_encoder encoder;

6
libvips/foreign/webp.h
View File

@ -45,8 +45,10 @@ int vips__webp_read_file( const char *name, VipsImage *out );
int vips__webp_read_buffer_header( void *buf, size_t len, VipsImage *out );
int vips__webp_read_buffer( void *buf, size_t len, VipsImage *out );
int vips__webp_write_file( VipsImage *out, const char *filename, int Q );
int vips__webp_write_buffer( VipsImage *out, void **buf, size_t *len, int Q );
int vips__webp_write_file( VipsImage *out, const char *filename,
int Q, gboolean lossless );
int vips__webp_write_buffer( VipsImage *out, void **buf, size_t *len,
int Q, gboolean lossless );
#ifdef __cplusplus
}

20
libvips/foreign/webpsave.c
View File

@ -56,6 +56,10 @@ typedef struct _VipsForeignSaveWebp {
*/
int Q;
/* Turn on lossless encode.
*/
gboolean lossless;
} VipsForeignSaveWebp;
typedef VipsForeignSaveClass VipsForeignSaveWebpClass;
@ -95,6 +99,13 @@ vips_foreign_save_webp_class_init( VipsForeignSaveWebpClass *class )
G_STRUCT_OFFSET( VipsForeignSaveWebp, Q ),
1, 100, 75 );
VIPS_ARG_BOOL( class, "lossless", 11,
_( "lossless" ),
_( "enable lossless compression" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveWebp, lossless ),
FALSE );
}
static void
@ -128,7 +139,8 @@ vips_foreign_save_webp_file_build( VipsObject *object )
build( object ) )
return( -1 );
if( vips__webp_write_file( save->ready, file->filename, webp->Q ) )
if( vips__webp_write_file( save->ready, file->filename,
webp->Q, webp->lossless ) )
return( -1 );
return( 0 );
@ -192,7 +204,8 @@ vips_foreign_save_webp_buffer_build( VipsObject *object )
build( object ) )
return( -1 );
if( vips__webp_write_buffer( save->ready, &obuf, &olen, webp->Q ) )
if( vips__webp_write_buffer( save->ready, &obuf, &olen,
webp->Q, webp->lossless ) )
return( -1 );
area = vips_area_new_blob( (VipsCallbackFn) vips_free, obuf, olen );
@ -252,7 +265,8 @@ vips_foreign_save_webp_mime_build( VipsObject *object )
build( object ) )
return( -1 );
if( vips__webp_write_buffer( save->ready, &obuf, &olen, webp->Q ) )
if( vips__webp_write_buffer( save->ready, &obuf, &olen,
webp->Q, webp->lossless ) )
return( -1 );
printf( "Content-length: %zd\r\n", olen );