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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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34
Userland/Services/WindowServer/WindowFrame.cpp
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@ -535,6 +535,40 @@ void WindowFrame::layout_buttons()
m_buttons[i].set_relative_rect(button_rects[i]);
}
bool WindowFrame::hit_test(const Gfx::IntPoint& point) const
{
if (m_window.is_frameless())
return false;
auto frame_rect = rect();
if (!frame_rect.contains(point))
return false;
auto window_rect = m_window.rect();
if (window_rect.contains(point))
return false;
u8 alpha_threshold = Gfx::WindowTheme::current().frame_alpha_hit_threshold(window_state_for_theme()) * 255;
if (alpha_threshold == 0)
return true;
u8 alpha = 0xff;
auto relative_point = point.translated(-render_rect().location());
if (point.y() < window_rect.y()) {
if (m_top_bottom)
alpha = m_top_bottom->get_pixel(relative_point).alpha();
} else if (point.y() > window_rect.bottom()) {
if (m_top_bottom)
alpha = m_top_bottom->get_pixel(relative_point.x(), m_bottom_y + point.y() - window_rect.bottom() - 1).alpha();
} else if (point.x() < window_rect.x()) {
if (m_left_right)
alpha = m_left_right->get_pixel(relative_point.x(), relative_point.y() - m_bottom_y).alpha();
} else if (point.x() > window_rect.right()) {
if (m_left_right)
alpha = m_left_right->get_pixel(m_right_x + point.x() - window_rect.right() - 1, relative_point.y() - m_bottom_y).alpha();
} else {
return false;
}
return alpha >= alpha_threshold;
}
void WindowFrame::on_mouse_event(const MouseEvent& event)
{
ASSERT(!m_window.is_fullscreen());