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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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d4973842c9
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9b71307d49
25 changed files with 244 additions and 71 deletions
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@ -9,10 +9,12 @@
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class GraphicsBitmap : public Retainable<GraphicsBitmap> {
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public:
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static RetainPtr<GraphicsBitmap> create(const Size&);
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static RetainPtr<GraphicsBitmap> create_wrapper(const Size&, RGBA32*);
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static RetainPtr<GraphicsBitmap> load_from_file(const String& path, const Size&);
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static RetainPtr<GraphicsBitmap> create_with_shared_buffer(int shared_buffer_id, const Size&, RGBA32* buffer = nullptr);
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enum class Format { Invalid, RGB32, RGBA32 };
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static RetainPtr<GraphicsBitmap> create(Format, const Size&);
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static RetainPtr<GraphicsBitmap> create_wrapper(Format, const Size&, RGBA32*);
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static RetainPtr<GraphicsBitmap> load_from_file(Format, const String& path, const Size&);
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static RetainPtr<GraphicsBitmap> create_with_shared_buffer(Format, int shared_buffer_id, const Size&, RGBA32* buffer = nullptr);
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~GraphicsBitmap();
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RGBA32* scanline(int y);
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@ -25,14 +27,17 @@ public:
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size_t pitch() const { return m_pitch; }
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int shared_buffer_id() const { return m_shared_buffer_id; }
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bool has_alpha_channel() const { return m_format == Format::RGBA32; }
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private:
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GraphicsBitmap(const Size&);
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GraphicsBitmap(const Size&, RGBA32*);
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GraphicsBitmap(int shared_buffer_id, const Size&, RGBA32*);
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GraphicsBitmap(Format, const Size&);
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GraphicsBitmap(Format, const Size&, RGBA32*);
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GraphicsBitmap(Format, int shared_buffer_id, const Size&, RGBA32*);
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Size m_size;
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RGBA32* m_data { nullptr };
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size_t m_pitch { 0 };
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Format m_format { Format::Invalid };
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bool m_mmaped { false };
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int m_shared_buffer_id { -1 };
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};
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