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WindowServer: Add support for alpha channel based hit testing

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This enables implementing non-rectangular window shapes, including
non-rectangular window frames.
This commit is contained in:
Tom 2021-02-14 16:42:37 -07:00 • committed by Andreas Kling
parent b3f0a5c917
commit d590e0c946
12 changed files with 107 additions and 12 deletions
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16
Userland/Services/WindowServer/Window.cpp
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@ -873,4 +873,20 @@ bool Window::is_descendant_of(Window& window) const
return false;
}
bool Window::hit_test(const Gfx::IntPoint& point, bool include_frame) const
{
if (!frame().rect().contains(point))
return false;
if (!rect().contains(point)) {
if (include_frame)
return frame().hit_test(point);
return false;
}
u8 threshold = alpha_hit_threshold() * 255;
if (threshold == 0 || !m_backing_store || !m_backing_store->has_alpha_channel())
return true;
auto color = m_backing_store->get_pixel(point.translated(-rect().location()));
return color.alpha() >= threshold;
}
}