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WindowServer: Support windows with alpha channels. And per-WSWindow opacity.
This patch also adds a Format concept to GraphicsBitmap. For now there are only two formats: RGB32 and RGBA32. Windows with alpha channel have their backing stores created in the RGBA32 format. Use this to make Terminal windows semi-transparent for that comfy rice look. There is one problem here, in that window compositing overdraw incurs multiple passes of blending of the same pixels. This leads to a mismatch in opacity which is obviously not good. I will work on this in a later patch. The alpha blending is currently straight C++. It should be relatively easy to optimize this using SSE instructions. For now I'm just happy with the cute effect. :^)
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25 changed files with 244 additions and 71 deletions
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@ -25,6 +25,9 @@ public:
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String title() const { return m_title; }
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void set_title(String&&);
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float opacity() const { return m_opacity; }
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void set_opacity(float opacity) { m_opacity = opacity; }
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int x() const { return m_rect.x(); }
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int y() const { return m_rect.y(); }
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int width() const { return m_rect.width(); }
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@ -59,6 +62,9 @@ public:
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void set_global_cursor_tracking_enabled(bool);
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bool global_cursor_tracking() const { return m_global_cursor_tracking_enabled; }
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bool has_alpha_channel() const { return m_has_alpha_channel; }
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void set_has_alpha_channel(bool value) { m_has_alpha_channel = value; }
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// For InlineLinkedList.
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// FIXME: Maybe make a ListHashSet and then WSWindowManager can just use that.
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WSWindow* m_next { nullptr };
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@ -72,9 +78,9 @@ private:
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bool m_is_being_dragged { false };
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bool m_global_cursor_tracking_enabled { false };
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bool m_visible { true };
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bool m_has_alpha_channel { false };
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WSMenu* m_menu { nullptr };
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RetainPtr<GraphicsBitmap> m_backing;
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int m_window_id { -1 };
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float m_opacity { 1 };
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};
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