feat(wallpapers): rework gallery and transition engine - #1083
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Split the wallpapers service into engine/gallery/images/manager and replace the old paged gallery with four layout types (default, magnified, strip, slide) selected through gallery.type. The transition engine now lays wallpapers out the way Windows does, so the last frame of the animation lands on the same pixels Windows settles on instead of jumping when the overlay closes: Add gallery.accent_color, deprecate the removed gallery options, and document the engine's dependency on Windows animation effects together with the known flash on very large images. - lay out the transcoded copy Windows uses, not the file on disk - anchor fill and span at a third of the vertical overflow, not a half - span wide landscape images across all monitors in fit and fill (autospan) - truncate integer division toward zero the way Windows does
- Track queued image loaders so they can be reordered or cancelled when the selection moves. - Queue and decode the cards nearest the selection first. - Drop queued loads that are no longer visible to save CPU and bandwidth. - Cap the image decoding pool at two threads to avoid starving the UI. - Repaint only when a decoded card is actually on screen.
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Split the wallpapers service into engine/gallery/images/manager and replace the old paged gallery with four layout types (default, magnified, strip, slide) selected through gallery.type.
The transition engine now lays wallpapers out the way Windows does, so the last frame of the animation lands on the same pixels Windows settles on instead of jumping when the overlay closes:
Add gallery.accent_color, deprecate the removed gallery options, and document the engine's dependency on Windows animation effects together with the known flash on very large images.