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WindowServer: Calculate transparent frame occlusions

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If a window frame has transparency, include these areas in the
transparency rendering area so that we can render them flicker-free.
This commit is contained in:
Tom 2021-02-07 17:44:04 -07:00 committed by Andreas Kling
parent f1b5def8fd
commit 8ff34f96b6
Notes: sideshowbarker 2024-07-18 22:29:55 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/8ff34f96b64
Pull-request: https://github.com/SerenityOS/serenity/pull/5265
Reviewed-by: https://github.com/awesomekling
2 changed files with 67 additions and 19 deletions
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74
Userland/Services/WindowServer/Compositor.cpp
View File

@ -920,11 +920,23 @@ void Compositor::recompute_occlusions()
Gfx::DisjointRectSet opaque_covering;
if (w.is_opaque()) {
visible_opaque = visible_rects.intersected(window_frame_rect);
transparency_rects.clear();
if (w.frame().is_opaque()) {
visible_opaque = visible_rects.intersected(window_frame_rect);
} else {
auto window_rect = w.rect().intersected(screen_rect);
visible_opaque = visible_rects.intersected(window_rect);
transparency_rects.add_many(window_frame_rect.shatter(window_rect));
}
} else {
visible_opaque.clear();
transparency_rects = visible_rects.intersected(window_frame_rect);
if (w.frame().is_opaque()) {
auto window_rect = w.rect().intersected(screen_rect);
visible_opaque.add_many(window_frame_rect.shatter(window_rect));
transparency_rects = visible_rects.intersected(window_rect);
} else {
transparency_rects = visible_rects.intersected(window_frame_rect);
}
}
bool found_this_window = false;
@ -942,26 +954,20 @@ void Compositor::recompute_occlusions()
if (covering_rect.is_empty())
return IterationDecision::Continue;
if (w2.is_opaque()) {
opaque_covering.add(covering_rect);
if (opaque_covering.contains(window_frame_rect)) {
// This window is entirely covered by another opaque window
visible_opaque.clear();
transparency_rects.clear();
return IterationDecision::Break;
}
auto add_opaque = [&](const Gfx::IntRect& covering) {
opaque_covering.add(covering);
if (!visible_opaque.is_empty()) {
auto uncovered_opaque = visible_opaque.shatter(covering_rect);
auto uncovered_opaque = visible_opaque.shatter(covering);
visible_opaque = move(uncovered_opaque);
}
if (!transparency_rects.is_empty()) {
auto uncovered_transparency = transparency_rects.shatter(covering_rect);
auto uncovered_transparency = transparency_rects.shatter(covering);
transparency_rects = move(uncovered_transparency);
}
} else {
visible_rects.for_each_intersected(covering_rect, [&](const Gfx::IntRect& intersected) {
};
auto add_transparent = [&](const Gfx::IntRect& covering) {
visible_rects.for_each_intersected(covering, [&](const Gfx::IntRect& intersected) {
transparency_rects.add(intersected);
if (!visible_opaque.is_empty()) {
auto uncovered_opaque = visible_opaque.shatter(intersected);
@ -969,6 +975,31 @@ void Compositor::recompute_occlusions()
}
return IterationDecision::Continue;
});
};
if (w2.is_opaque()) {
if (w2.frame().is_opaque()) {
if (opaque_covering.contains(covering_rect)) {
// This window (including frame) is entirely covered by another opaque window
visible_opaque.clear();
transparency_rects.clear();
return IterationDecision::Break;
}
add_opaque(covering_rect);
} else {
auto covering_window_rect = covering_rect.intersected(w2.rect());
add_opaque(covering_window_rect);
for (auto& covering_frame_rect : covering_rect.shatter(covering_window_rect))
add_transparent(covering_frame_rect);
}
} else {
if (w2.frame().is_opaque()) {
auto covering_window_rect = covering_rect.intersected(w2.rect());
add_transparent(covering_window_rect);
for (auto& covering_frame_rect : covering_rect.shatter(covering_window_rect))
add_opaque(covering_frame_rect);
} else {
add_transparent(covering_rect);
}
}
return IterationDecision::Continue;
@ -979,10 +1010,15 @@ void Compositor::recompute_occlusions()
ASSERT(!visible_opaque.intersects(transparency_rects));
// Determine visible area for the window below
if (w.is_opaque()) {
// Determine visible area for the window below
auto visible_rects_below_window = visible_rects.shatter(window_frame_rect);
visible_rects = move(visible_rects_below_window);
if (w.frame().is_opaque()) {
auto visible_rects_below_window = visible_rects.shatter(window_frame_rect);
visible_rects = move(visible_rects_below_window);
} else {
auto visible_rects_below_window = visible_rects.shatter(w.rect().intersected(screen_rect));
visible_rects = move(visible_rects_below_window);
}
}
return IterationDecision::Continue;
});
@ -991,7 +1027,7 @@ void Compositor::recompute_occlusions()
// Determine what transparent window areas need to render the wallpaper first
WindowManager::the().for_each_visible_window_from_back_to_front([&](Window& w) {
auto& transparency_wallpaper_rects = w.transparency_wallpaper_rects();
if (w.is_opaque() || w.is_minimized()) {
if ((w.is_opaque() && w.frame().is_opaque()) || w.is_minimized()) {
transparency_wallpaper_rects.clear();
return IterationDecision::Continue;
}

12
Userland/Services/WindowServer/WindowFrame.h
View File

@ -62,6 +62,17 @@ public:
void start_flash_animation();
float opacity() const { return m_opacity; }
bool is_opaque() const
{
if (opacity() < 1.0f)
return false;
//if (has_alpha_channel())
// return false;
return true;
}
private:
void paint_notification_frame(Gfx::Painter&);
void paint_normal_frame(Gfx::Painter&);
@ -76,6 +87,7 @@ private:
RefPtr<Core::Timer> m_flash_timer;
size_t m_flash_counter { 0 };
float m_opacity { 1 };
};
}