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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/GLabel.cpp
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@ -31,7 +31,7 @@ void GLabel::paint_event(GPaintEvent&)
painter.fill_rect({ 0, 0, width(), height() }, background_color());
if (m_icon) {
auto icon_location = rect().center().translated(-(m_icon->width() / 2), -(m_icon->height() / 2));
painter.blit_with_alpha(icon_location, *m_icon, m_icon->rect());
painter.blit(icon_location, *m_icon, m_icon->rect());
}
if (!text().is_empty())
painter.draw_text({ 0, 0, width(), height() }, text(), m_text_alignment, foreground_color());