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only use webp presets in lossy mode

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it seems lossless and near-lossless modes have a separate preset system

see https://github.com/jcupitt/libvips/issues/578
This commit is contained in:
John Cupitt 2017-01-13 12:37:19 +00:00
parent c5e675f7db
commit dafa26435e
1 changed files with 12 additions and 1 deletions
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13
libvips/foreign/vips2webp.c
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@ -237,7 +237,18 @@ write_webp( WebPPicture *pic, VipsImage *in,
WebPConfig config;
webp_import import;
if ( !WebPConfigPreset( &config, get_preset( preset ), Q ) ) {
if( !WebPConfigInit( &config ) ) {
vips_error( "vips2webp",
"%s", _( "config version error" ) );
return( -1 );
}
/* These presets are only for lossy compression. There seems to be
* separate API for lossless or near-lossless, see
* WebPConfigLosslessPreset().
*/
if( !(lossless || near_lossless) &&
!WebPConfigPreset( &config, get_preset( preset ), Q ) ) {
vips_error( "vips2webp", "%s", _( "config version error" ) );
return( -1 );
}