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WindowServer: Skip composing windows where entire dirty rect is covered.

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If another window is currently in front of us and is fully opaque,
we can just skip to the next window. This avoids a whole lot of painting
with overlapping windows. :^)
This commit is contained in:
Andreas Kling 2019-03-09 21:38:28 +01:00
parent 963e95cb1a
commit 272a41d02d
Notes: sideshowbarker 2024-07-19 15:06:10 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/272a41d02d6
1 changed files with 16 additions and 0 deletions
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16
WindowServer/WSWindowManager.cpp
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@ -871,6 +871,20 @@ void WSWindowManager::compose()
return false;
};
auto any_opaque_window_above_this_one_contains_rect = [this] (const WSWindow& a_window, const Rect& r) {
for (auto* window = a_window.next(); window; window = window->next()) {
if (!window->is_visible())
continue;
if (window->opacity() < 1.0f)
continue;
if (window->has_alpha_channel())
continue;
if (outer_window_rect(*window).contains(r))
return true;
}
return false;
};
auto any_dirty_rect_intersects_window = [&dirty_rects] (const WSWindow& window) {
auto window_rect = outer_window_rect(window);
for (auto& dirty_rect : dirty_rects.rects()) {
@ -898,6 +912,8 @@ void WSWindowManager::compose()
PainterStateSaver saver(*m_back_painter);
m_back_painter->set_clip_rect(outer_window_rect(window));
for (auto& dirty_rect : dirty_rects.rects()) {
if (any_opaque_window_above_this_one_contains_rect(window, dirty_rect))
continue;
PainterStateSaver saver(*m_back_painter);
m_back_painter->set_clip_rect(dirty_rect);
paint_window_frame(window);