WindowServer: Give windows a "background color" to use for missing parts.

When resizing a window, we often end up having to paint some part of it
without coverage in the current backing store. This patch makes those cases
look nicer by having a fallback background color for each window, passed
along with the CreateWindow client message.

2 files changed, 5 insertions, 0 deletions

diff --git a/LibGUI/GWindow.cpp b/LibGUI/GWindow.cpp
index 72a5b2fb16..59c5710cca 100644
--- a/LibGUI/GWindow.cpp
+++ b/LibGUI/GWindow.cpp
@@ -62,6 +62,7 @@ void GWindow::show()
     request.window.modal = m_modal;
     request.window.resizable = m_resizable;
     request.window.opacity = m_opacity_when_windowless;
+    request.window.background_color = m_background_color.value();
     request.window.size_increment = m_size_increment;
     request.window.base_size = m_base_size;
     request.window.type = (WSAPI_WindowType)m_window_type;
diff --git a/LibGUI/GWindow.h b/LibGUI/GWindow.h
index 9504c32dc9..e7d8371059 100644
--- a/LibGUI/GWindow.h
+++ b/LibGUI/GWindow.h
@@ -38,6 +38,9 @@ public:
     String title() const;
     void set_title(const String&);
 
+    Color background_color() const { return m_background_color; }
+    void set_background_color(Color color) { m_background_color = color; }
+
     int x() const { return rect().x(); }
     int y() const { return rect().y(); }
     int width() const { return rect().width(); }
@@ -123,6 +126,7 @@ private:
     Vector<Rect> m_pending_paint_event_rects;
     Size m_size_increment;
     Size m_base_size;
+    Color m_background_color { Color::LightGray };
     GWindowType m_window_type { GWindowType::Normal };
     bool m_is_active { false };
     bool m_should_exit_app_on_close { false };