RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 19:37:35 +00:00
Code Issues Activity Actions

WindowServer: Add support for alpha channel based hit testing

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

34
Userland/Services/WindowServer/WindowFrame.cpp
View file

@ -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());