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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
Applications/Launcher/main.cpp
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@ -38,7 +38,7 @@ public:
: GButton(parent)
, m_executable_path(exec_path)
{
set_icon(GraphicsBitmap::load_from_file(icon_path, { 32, 32 }));
set_icon(GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, icon_path, { 32, 32 }));
resize(50, 50);
on_click = [this] (GButton&) {
pid_t child_pid = fork();