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f3dbc464fc Decode theme backgrounds earlier, and at screen size (#13408 )

* Decode the next theme background while the theme stages

The wipe waited 125-290ms after the transition arrived, decoding the new
wallpaper. Most stock wallpapers are WebP, which Qt decodes at full size
and scales afterwards, so a screen-sized sourceSize does not shorten it.

Start the decode earlier instead. omarchy-theme-set chooses the next
background and snapshots it before rendering templates, then sends a new
background prepare call in the background. The shell loads it into the
hidden incoming frame, so the transition finds it decoded. A prepare that
arrives after its transition is ignored, and one no transition claims is
dropped after five seconds.

The wipe now starts ~255ms after omarchy-theme-set begins instead of
~345-490ms.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Decode the wallpaper at screen size instead of shipped size

Wallpapers decoded at the resolution they were shipped at: a 5120x2880
stock wallpaper took 5120x2880 of RGBA on a 1920x1200 panel, and a
transition held up to three such frames. Bind sourceSize on the
displayed wallpaper and both transition frames to the screen's physical
size. PreserveAspectCrop treats it as the area to cover, so the image
still fills the screen.

Qt scales a decode up as well as down to cover sourceSize, so the native
size is read from the file header first with magick identify, and a
wallpaper smaller than the screen decodes at its own size. The images
wait for both sizes, so nothing decodes at native size first.

Ported from #8324 onto BackgroundMedia and the prepared incoming frame.
Measured with a 5120x2880 wallpaper, the shell's GPU memory at rest
drops from 264 MiB to ~148 MiB. The size probe delays the reveal by
~30ms, which the earlier prepare still more than covers.

Co-authored-by: Ryan Yogan <ryanyogan@gmail.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Ryan Yogan <ryanyogan@gmail.com>

2026-09-27 16:11:36 +02:00