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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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12
LibGUI/GWindow.h
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@ -15,6 +15,7 @@ public:
static GWindow* from_window_id(int);
void set_double_buffering_enabled(bool);
void set_has_alpha_channel(bool);
void set_opacity(float);
@ -68,7 +69,8 @@ public:
const GWidget* hovered_widget() const { return m_hovered_widget.ptr(); }
void set_hovered_widget(GWidget*);
GraphicsBitmap* backing() { return m_backing.ptr(); }
GraphicsBitmap* front_bitmap() { return m_front_bitmap.ptr(); }
GraphicsBitmap* back_bitmap() { return m_back_bitmap.ptr(); }
Size size_increment() const { return m_size_increment; }
void set_size_increment(const Size& increment) { m_size_increment = increment; }
@ -78,7 +80,12 @@ public:
private:
virtual const char* class_name() const override { return "GWindow"; }
RetainPtr<GraphicsBitmap> m_backing;
Retained<GraphicsBitmap> create_backing_bitmap(const Size&);
void set_current_backing_bitmap(GraphicsBitmap&, bool flush_immediately = false);
void flip(const Rect& dirty_rect);
RetainPtr<GraphicsBitmap> m_front_bitmap;
RetainPtr<GraphicsBitmap> m_back_bitmap;
int m_window_id { 0 };
float m_opacity_when_windowless { 1.0f };
GWidget* m_main_widget { nullptr };
@ -93,5 +100,6 @@ private:
bool m_is_active { false };
bool m_should_exit_app_on_close { false };
bool m_has_alpha_channel { false };
bool m_double_buffering_enabled { true };
};