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WindowServer: Cache rendered window frame in bitmap

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This only renders the window frame once until the size of the window
changes, or some other event requires re-rendering. It is rendered
to a temporary bitmap, and then the top and bottom part is stored
in one bitmap as well as the left and right part. This also adds
an opacity setting, allowing it to be rendered with a different
opacity.

This makes it easier to enhance window themes and allows using
arbitrary bitmaps with e.g. alpha channels for e.g. shadows.
This commit is contained in:
Tom 2021-02-07 22:26:31 -07:00 • committed by Andreas Kling
parent 8ff34f96b6
commit 15a1d9aa94
4 changed files with 138 additions and 10 deletions
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4
Userland/Services/WindowServer/WindowManager.cpp
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@ -1515,7 +1515,9 @@ void WindowManager::reload_icon_bitmaps_after_scale_change(bool allow_hidpi_icon
m_allow_hidpi_icons = allow_hidpi_icons;
reload_config();
for_each_window([&](Window& window) {
window.frame().set_button_icons();
auto& window_frame = window.frame();
window_frame.set_button_icons();
window_frame.scale_changed();
return IterationDecision::Continue;
});
}