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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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@ -117,6 +117,7 @@ struct WSAPI_ServerMessage {
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size_t bpp;
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size_t pitch;
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int shared_buffer_id;
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bool has_alpha_channel;
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} backing;
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};
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};
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@ -142,6 +143,7 @@ struct WSAPI_ClientMessage {
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DidFinishPainting,
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GetWindowBackingStore,
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SetGlobalCursorTracking,
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SetWindowOpacity,
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};
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Type type { Invalid };
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int window_id { -1 };
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@ -157,6 +159,8 @@ struct WSAPI_ClientMessage {
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} menu;
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struct {
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WSAPI_Rect rect;
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bool has_alpha_channel;
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float opacity;
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} window;
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};
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};
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