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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
LibGUI/GWidget.h
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@ -128,8 +128,8 @@ private:
OwnPtr<GLayout> m_layout;
Rect m_relative_rect;
Color m_background_color { 0xffffff };
Color m_foreground_color { 0x000000 };
Color m_background_color;
Color m_foreground_color;
RetainPtr<Font> m_font;
SizePolicy m_horizontal_size_policy { SizePolicy::Fill };