* Decode webp in the shell
The background and the lock screen are drawn by Quickshell, so they
decode through Qt, which ships handlers for png, jpeg and gif but not
webp. QImageReader answers "Unsupported image format" and the layer
comes up blank. Any third-party theme shipping a .webp background hits
this today, even though every path that goes looking for a background
already globs the extension.
qt6-imageformats supplies the missing plugin for 71 KB downloaded. Its
one new dependency of substance, libwebp, is already on every machine
by way of libvips.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
* Store theme backgrounds as webp
WebP codes both of the things these backgrounds are made of better than
the formats they were in: the photographs, where its lossy mode is worth
a third or more over JPEG at matched quality, and the flat art and dot
patterns, where its lossless mode undercuts an oxipng-packed PNG.
28 of them become lossless webp and decode bit-for-bit identically
(AE=0), so the dot patterns and flat-shaded pieces carry no quality
question at all. That includes 0-launch, whose alpha channel comes
through intact. The other 51 are photographs held to the same 38 dB
PSNR floor as the JPEG pass, landing between 38.0 and 54.6 dB. Every
image keeps its exact pixel dimensions, for 29.8 MB.
Each one is encoded from the original as it stands in quattro rather
than from the file the earlier commits produced, so nothing picks up a
second generation of loss on the way here.
13 stay JPEG. WebP is plainly larger for most of them, and three are
grainy enough that its filter smooths the grain instead of coding it:
PSNR plateaus near 34 dB however high the quality goes, well under the
floor.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
