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feat: add progressive rendering option for static jpeg images (#1397)

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Samuel 2024-10-10 14:56:56 +01:00 committed by GitHub
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commit 760653901e
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2 changed files with 6 additions and 2 deletions
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3
docs/config.rst
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@ -94,7 +94,8 @@ Use ``false`` to disable the front page altogether (404).
----------------- -----------------
You can use this to specify options for the generation of images in the supported file formats. You can use this to specify options for the generation of images in the supported file formats.
For JPEG and WebP, the only supported option is ``quality`` [0-100]. For WebP, the only supported option is ``quality`` [0-100].
For JPEG, the only supported options are ``quality`` [0-100] and ``progressive`` [true, false].
For PNG, the full set of options `exposed by the sharp library <https://sharp.pixelplumbing.com/api-output#png>`_ is available, except ``force`` and ``colours`` (use ``colors``). If not set, their values are the defaults from ``sharp``. For PNG, the full set of options `exposed by the sharp library <https://sharp.pixelplumbing.com/api-output#png>`_ is available, except ``force`` and ``colours`` (use ``colors``). If not set, their values are the defaults from ``sharp``.
For example:: For example::

5
src/serve_rendered.js
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@ -527,7 +527,10 @@ const respondImage = (
dither: formatOptions.dither, dither: formatOptions.dither,
}); });
} else if (format === 'jpeg') { } else if (format === 'jpeg') {
image.jpeg({ quality: formatOptions.quality || formatQuality || 80 }); image.jpeg({
quality: formatOptions.quality || formatQuality || 80,
progressive: formatOptions.progressive,
});
} else if (format === 'webp') { } else if (format === 'webp') {
image.webp({ quality: formatOptions.quality || formatQuality || 90 }); image.webp({ quality: formatOptions.quality || formatQuality || 90 });
} }