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plug-ins: Use WebPConfigLosslessPreset () for...

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...lossless WEBP export
Resolves #15625

Per Daniel Plakhotich, we should use
WebPConfigLosslessPreset () when saving
lossless WEBP, so that the lossy quality settings
defined by the user don't override the lossless
values and unintentionally change the exported
file.
This commit is contained in:
Alx Sa 2026-01-06 20:04:18 +00:00
parent 0bca2158fe
commit b64faaaa26
1 changed files with 31 additions and 13 deletions
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44
plug-ins/file-webp/file-webp-export.c
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@ -239,14 +239,22 @@ save_layer (GFile *file,
w = extent.width;
h = extent.height;
/* Initialize the WebP configuration with a preset and fill in the
* remaining values */
WebPConfigPreset (&webp_config, preset, quality);
if (lossless)
{
WebPConfigInit (&webp_config);
WebPConfigLosslessPreset (&webp_config, 6);
}
else
{
/* Initialize the WebP configuration with a preset and fill in the
* remaining values */
WebPConfigPreset (&webp_config, preset, quality);
webp_config.lossless = lossless;
webp_config.method = 6; /* better quality */
webp_config.alpha_quality = alpha_quality;
webp_config.use_sharp_yuv = use_sharp_yuv ? 1 : 0;
webp_config.lossless = FALSE;
webp_config.method = 6; /* better quality */
webp_config.alpha_quality = alpha_quality;
webp_config.use_sharp_yuv = use_sharp_yuv ? 1 : 0;
}
/* Prepare the WebP structure */
WebPPictureInit (&picture);
@ -708,13 +716,23 @@ save_animation (GFile *file,
}
}
WebPConfigPreset (&webp_config, preset, quality);
if (lossless)
{
WebPConfigInit (&webp_config);
WebPConfigLosslessPreset (&webp_config, 6);
}
else
{
/* Initialize the WebP configuration with a preset and fill in the
* remaining values */
WebPConfigPreset (&webp_config, preset, quality);
webp_config.lossless = lossless;
webp_config.method = 6; /* better quality */
webp_config.alpha_quality = alpha_quality;
webp_config.exact = 1;
webp_config.use_sharp_yuv = use_sharp_yuv ? 1 : 0;
webp_config.lossless = FALSE;
webp_config.method = 6; /* better quality */
webp_config.alpha_quality = alpha_quality;
webp_config.use_sharp_yuv = use_sharp_yuv ? 1 : 0;
}
webp_config.exact = 1;
WebPMemoryWriterInit (&mw);