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LibGUI+WindowServer: Coalesce paints and resizes on the client side.

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Only process paint and resize events on the GUI client side if those events
have the latest up-to-date window size. This drastically reduces async
overdraw during interactive resize.
This commit is contained in:
Andreas Kling
2019-04-10 15:39:28 +02:00
parent 0ac55f2c38
commit 55811f233f
5 changed files with 50 additions and 13 deletions
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8
LibGUI/GWindow.cpp
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@@ -211,11 +211,17 @@ void GWindow::event(GEvent& event)
return;
auto& paint_event = static_cast<GPaintEvent&>(event);
auto rect = paint_event.rect();
if (m_back_bitmap && m_back_bitmap->size() != paint_event.window_size()) {
// Eagerly discard the backing store if we learn from this paint event that it needs to be bigger.
// Otherwise we would have to wait for a resize event to tell us. This way we don't waste the
// effort on painting into an undersized bitmap that will be thrown away anyway.
m_back_bitmap = nullptr;
}
bool created_new_backing_store = !m_back_bitmap;
if (!m_back_bitmap)
m_back_bitmap = create_backing_bitmap(paint_event.window_size());
if (rect.is_empty() || created_new_backing_store)
rect = m_main_widget->rect();
rect = { { }, paint_event.window_size() };
m_main_widget->event(*make<GPaintEvent>(rect));