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A brief flicker was left at the start of the burn on both screens. The
cover drew each picture as soon as it decoded, and the new one, under
the old, usually decodes first, so it showed for a frame or two before
the old one covered it. Both now stay hidden until both are ready; the
surface is clear until then, and swaybg underneath is still showing
the old picture, since wallp waits for covered().
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The new wallpaper flashed in for a moment, the old one came back over
it, and only then did it burn. run() started wallp in the same turn as
swapping, while the cover was still mapping and decoding its two
pictures asynchronously, so swaybg swapped under an empty cover.
run() now holds wallp until each cover reports it is drawing (its
pictures decoded, then 50ms for a few frames), with a 1.5s fallback for
a cover that never comes: a missing screen or a picture that fails to
load. A run with nothing to cover starts at once, as before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The engine's timer must set wallpapers the same way Apply does so the
burn plays. run() is that one path; applied stays Apply's alone (save bar,
window close) while finished marks every run's end, which is what the
spread overlay now hides on.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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swaybg has no transitions: wallp kills the running one and starts a new
one, which can show a frame of nothing in between. WallpaperSpread puts a
click-through surface on the bottom layer of each screen, above swaybg and
below every window, holding the old picture while wallp runs. A shader
burns it away over the new one: each pixel's threshold mixes its distance
from a random starting point with fractal noise, and a flame and char band
runs just ahead of the front. The surface goes once wallp has exited, or
at once if it failed, since a failed set may have left either picture.
Wallpapers.apply() announces each swap with the old path before wallp
runs, while current still names it. Sets from a terminal get no effect:
by the time wall_h changes, swaybg has already swapped.
The animation is linear, 3.5s: an ease spent its slow ends where nothing
was left to burn, and read as well under the 2.6s it was given. The
compiled .qsb is committed beside its source, since nothing builds it.
AGENTS.md gains the shader cache trap hit on the way: a running shell
keeps a shader by URL, so a recompiled .qsb under the same name is
ignored.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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