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Add client-side double buffering of window backing stores.

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This prevents flicker and looks rather good. The main downside is that
resizing gets even more sluggish. That's the price we pay for now.
This commit is contained in:
Andreas Kling 2019-03-17 04:23:54 +01:00
parent 2ac4f54724
commit 4e451c1e92
12 changed files with 95 additions and 39 deletions
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4
WindowServer/WSWindowManager.cpp
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@ -916,8 +916,6 @@ void WSWindowManager::compose()
for_each_visible_window_from_back_to_front([&] (WSWindow& window) {
RetainPtr<GraphicsBitmap> backing_store = window.backing_store();
if (!backing_store)
return IterationDecision::Continue;
if (!any_dirty_rect_intersects_window(window))
return IterationDecision::Continue;
PainterStateSaver saver(*m_back_painter);
@ -928,6 +926,8 @@ void WSWindowManager::compose()
PainterStateSaver saver(*m_back_painter);
m_back_painter->set_clip_rect(dirty_rect);
paint_window_frame(window);
if (!backing_store)
continue;
Rect dirty_rect_in_window_coordinates = Rect::intersection(dirty_rect, window.rect());
if (dirty_rect_in_window_coordinates.is_empty())
continue;