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WindowServer: Fix flickering

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Rather than blitting and rendering each window every time, only
render what actually changed. And while doing so, only render
the portions that are visible on the screen. This avoids flickering
because flipping framebuffers isn't always perfectly in sync with
the code, so it's possible that the flip happens slightly delayed
and we can briefly see the next iteration having partially completed.

Also, avoid touching the mouse cursor unless it is in an area that
needs updating. This reduces flickering unless it is over an area
that is updated often. And because we no longer render the entire
screen, we'll save the contents below the cursor so that we can
hide it before touching that area.

Fixes #2981
This commit is contained in:
Tom
2020-08-17 22:45:10 -06:00
committed by Andreas Kling
parent f8903acea2
commit a698a58d3c
11 changed files with 679 additions and 186 deletions
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24
Services/WindowServer/WindowFrame.cpp
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@@ -234,17 +234,31 @@ Gfx::IntRect WindowFrame::rect() const
void WindowFrame::invalidate_title_bar()
{
Compositor::the().invalidate(title_bar_rect().translated(rect().location()));
invalidate(title_bar_rect());
}
void WindowFrame::invalidate(Gfx::IntRect relative_rect)
{
auto frame_rect = rect();
auto window_rect = m_window.rect();
relative_rect.move_by(frame_rect.x() - window_rect.x(), frame_rect.y() - window_rect.y());
m_window.invalidate(relative_rect);
}
void WindowFrame::notify_window_rect_changed(const Gfx::IntRect& old_rect, const Gfx::IntRect& new_rect)
{
layout_buttons();
auto& wm = WindowManager::the();
wm.invalidate(frame_rect_for_window(m_window, old_rect));
wm.invalidate(frame_rect_for_window(m_window, new_rect));
wm.notify_rect_changed(m_window, old_rect, new_rect);
auto old_frame_rect = frame_rect_for_window(m_window, old_rect);
auto& compositor = Compositor::the();
for (auto& dirty : old_frame_rect.shatter(rect()))
compositor.invalidate_screen(dirty);
if (!m_window.is_opaque())
compositor.invalidate_screen(rect());
compositor.invalidate_occlusions();
WindowManager::the().notify_rect_changed(m_window, old_rect, new_rect);
}
void WindowFrame::layout_buttons()