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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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4
WindowServer/WSAPITypes.h
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@ -117,6 +117,7 @@ struct WSAPI_ServerMessage {
size_t bpp;
size_t pitch;
int shared_buffer_id;
bool has_alpha_channel;
} backing;
};
};
@ -142,6 +143,7 @@ struct WSAPI_ClientMessage {
DidFinishPainting,
GetWindowBackingStore,
SetGlobalCursorTracking,
SetWindowOpacity,
};
Type type { Invalid };
int window_id { -1 };
@ -157,6 +159,8 @@ struct WSAPI_ClientMessage {
} menu;
struct {
WSAPI_Rect rect;
bool has_alpha_channel;
float opacity;
} window;
};
};