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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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2
LibGUI/GButton.cpp
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@ -36,7 +36,7 @@ void GButton::paint_event(GPaintEvent&)
icon_location.move_by(1, 1);
}
if (m_icon) {
painter.blit_with_alpha(icon_location, *m_icon, m_icon->rect());
painter.blit(icon_location, *m_icon, m_icon->rect());
painter.draw_text(content_rect, caption(), TextAlignment::Center, Color::Black);
} else {
painter.draw_text(content_rect, caption(), TextAlignment::Center, Color::Black);