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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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21
LibGUI/GWindow.cpp
View file

@ -59,6 +59,8 @@ void GWindow::show()
request.type = WSAPI_ClientMessage::Type::CreateWindow;
request.window_id = m_window_id;
request.window.rect = m_rect_when_windowless;
request.window.has_alpha_channel = m_has_alpha_channel;
request.window.opacity = m_opacity_when_windowless;
ASSERT(m_title_when_windowless.length() < sizeof(request.text));
strcpy(request.text, m_title_when_windowless.characters());
request.text_length = m_title_when_windowless.length();
@ -280,3 +282,22 @@ void GWindow::set_global_cursor_tracking_widget(GWidget* widget)
// Maybe there could be a response that includes the current cursor location as of enabling.
GEventLoop::main().post_message_to_server(request);
}
void GWindow::set_has_alpha_channel(bool value)
{
ASSERT(!m_window_id);
m_has_alpha_channel = value;
}
void GWindow::set_opacity(float opacity)
{
m_opacity_when_windowless = opacity;
if (!m_window_id)
return;
WSAPI_ClientMessage request;
request.type = WSAPI_ClientMessage::Type::SetWindowOpacity;
request.window_id = m_window_id;
request.window.opacity = opacity;
m_opacity_when_windowless = opacity;
GEventLoop::main().post_message_to_server(request);
}