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WindowServer: Improve occlusion calculations

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This solves two problems:
* A window was sometimes deemed occluded when the window rect was
  entirely covered by other rectangles, transparent or opaque. This
  caused a window to stop rendering even if a small portion was still
  visible, e.g. when it was merely covered by a window shadow.
* The window switcher is interested in window updates even when a
  window is entirely covered by another one, or when it is on another
  desktop. This forces windows to be not occluded in those cases.
This commit is contained in:
Tom 2021-07-02 13:27:39 -06:00 • committed by Andreas Kling
parent c06e765a5a
commit 6ec35c91bc
2 changed files with 26 additions and 47 deletions
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Userland/Services/WindowServer/Compositor.h
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@ -138,7 +138,6 @@ private:
void start_compose_async_timer();
void recompute_overlay_rects();
void recompute_occlusions();
bool any_opaque_window_above_this_one_contains_rect(Window&, const Gfx::IntRect&);
void change_cursor(const Cursor*);
void flush(Screen&);
Gfx::IntPoint window_transition_offset(Window&);