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WindowServer: Improvements to support alpha channel in window frames

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This fixes some issues handling the alpha channel that may be present
in rendered window frames.

Fixes #5303
This commit is contained in:
Tom 2021-02-12 14:25:08 -07:00 • committed by Andreas Kling
parent 9ae02d4c92
commit 0138f13bfe
6 changed files with 55 additions and 20 deletions
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18
Userland/Services/WindowServer/WindowFrame.cpp
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@ -221,6 +221,8 @@ Gfx::Bitmap* WindowFrame::window_shadow() const
bool WindowFrame::frame_has_alpha() const
{
if (m_has_alpha_channel)
return true;
if (auto* shadow_bitmap = window_shadow(); shadow_bitmap && shadow_bitmap->format() == Gfx::BitmapFormat::RGBA32)
return true;
return false;
@ -347,12 +349,27 @@ void WindowFrame::render(Gfx::Painter& painter)
}
}
void WindowFrame::theme_changed()
{
m_dirty = m_shadow_dirty = true;
m_top_bottom = nullptr;
m_left_right = nullptr;
m_bottom_y = m_right_x = 0;
layout_buttons();
set_button_icons();
m_has_alpha_channel = Gfx::WindowTheme::current().frame_uses_alpha(window_state_for_theme(), WindowManager::the().palette());
}
void WindowFrame::render_to_cache()
{
if (!m_dirty)
return;
m_dirty = false;
m_has_alpha_channel = Gfx::WindowTheme::current().frame_uses_alpha(window_state_for_theme(), WindowManager::the().palette());
static Gfx::Bitmap* s_tmp_bitmap;
auto frame_rect = rect();
auto total_frame_rect = frame_rect;
@ -387,6 +404,7 @@ void WindowFrame::render_to_cache()
Gfx::IntPoint update_location(m_shadow_dirty ? Gfx::IntPoint { 0, 0 } : m_shadow_offset);
Gfx::Painter painter(*s_tmp_bitmap);
// Clear the frame area, not including the window content area, which we don't care about
for (auto& rect : frame_rect_to_update.shatter(window_rect))
painter.clear_rect({ rect.location() - frame_rect_to_update.location(), rect.size() }, { 255, 255, 255, 0 });