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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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@ -22,7 +22,7 @@ public:
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static void for_each_client(Function<void(WSClientConnection&)>);
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void post_message(const WSAPI_ServerMessage&);
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RetainPtr<GraphicsBitmap> create_shared_bitmap(const Size&);
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RetainPtr<GraphicsBitmap> create_shared_bitmap(GraphicsBitmap::Format, const Size&);
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int client_id() const { return m_client_id; }
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WSMenuBar* app_menubar() { return m_app_menubar.ptr(); }
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@ -52,6 +52,7 @@ private:
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void handle_request(WSAPIDidFinishPaintingNotification&);
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void handle_request(WSAPIGetWindowBackingStoreRequest&);
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void handle_request(WSAPISetGlobalCursorTrackingRequest&);
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void handle_request(WSAPISetWindowOpacityRequest&);
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void post_error(const String&);
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