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WindowServer: Support windows with alpha channels. And per-WSWindow opacity.

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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. :^)
This commit is contained in:
Andreas Kling 2019-02-19 01:42:53 +01:00
parent d4973842c9
commit 9b71307d49
25 changed files with 244 additions and 71 deletions
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3
WindowServer/WSClientConnection.h
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@ -22,7 +22,7 @@ public:
static void for_each_client(Function<void(WSClientConnection&)>);
void post_message(const WSAPI_ServerMessage&);
RetainPtr<GraphicsBitmap> create_shared_bitmap(const Size&);
RetainPtr<GraphicsBitmap> create_shared_bitmap(GraphicsBitmap::Format, const Size&);
int client_id() const { return m_client_id; }
WSMenuBar* app_menubar() { return m_app_menubar.ptr(); }
@ -52,6 +52,7 @@ private:
void handle_request(WSAPIDidFinishPaintingNotification&);
void handle_request(WSAPIGetWindowBackingStoreRequest&);
void handle_request(WSAPISetGlobalCursorTrackingRequest&);
void handle_request(WSAPISetWindowOpacityRequest&);
void post_error(const String&);