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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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7
WindowServer/WSWindow.cpp
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@ -44,9 +44,10 @@ void WSWindow::set_rect(const Rect& rect)
m_rect = rect;
if (!m_backing || old_rect.size() != rect.size()) {
if (m_menu)
m_backing = GraphicsBitmap::create(m_rect.size());
else if (m_client)
m_backing = m_client->create_shared_bitmap(m_rect.size());
m_backing = GraphicsBitmap::create(GraphicsBitmap::Format::RGB32, m_rect.size());
else if (m_client) {
m_backing = m_client->create_shared_bitmap(m_has_alpha_channel ? GraphicsBitmap::Format::RGBA32 : GraphicsBitmap::Format::RGB32, m_rect.size());
}
}
WSWindowManager::the().notify_rect_changed(*this, old_rect, rect);