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https://github.com/RGBCube/serenity
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WindowServer: Support windows with alpha channels. And per-WSWindow opacity.
This patch also adds a Format concept to GraphicsBitmap. For now there are only two formats: RGB32 and RGBA32. Windows with alpha channel have their backing stores created in the RGBA32 format. Use this to make Terminal windows semi-transparent for that comfy rice look. There is one problem here, in that window compositing overdraw incurs multiple passes of blending of the same pixels. This leads to a mismatch in opacity which is obviously not good. I will work on this in a later patch. The alpha blending is currently straight C++. It should be relatively easy to optimize this using SSE instructions. For now I'm just happy with the cute effect. :^)
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d4973842c9
commit
9b71307d49
25 changed files with 244 additions and 71 deletions
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@ -36,7 +36,7 @@ void GButton::paint_event(GPaintEvent&)
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icon_location.move_by(1, 1);
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}
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if (m_icon) {
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painter.blit_with_alpha(icon_location, *m_icon, m_icon->rect());
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painter.blit(icon_location, *m_icon, m_icon->rect());
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painter.draw_text(content_rect, caption(), TextAlignment::Center, Color::Black);
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} else {
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painter.draw_text(content_rect, caption(), TextAlignment::Center, Color::Black);
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@ -31,7 +31,7 @@ void GLabel::paint_event(GPaintEvent&)
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painter.fill_rect({ 0, 0, width(), height() }, background_color());
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if (m_icon) {
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auto icon_location = rect().center().translated(-(m_icon->width() / 2), -(m_icon->height() / 2));
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painter.blit_with_alpha(icon_location, *m_icon, m_icon->rect());
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painter.blit(icon_location, *m_icon, m_icon->rect());
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}
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if (!text().is_empty())
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painter.draw_text({ 0, 0, width(), height() }, text(), m_text_alignment, foreground_color());
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@ -128,8 +128,8 @@ private:
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OwnPtr<GLayout> m_layout;
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Rect m_relative_rect;
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Color m_background_color { 0xffffff };
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Color m_foreground_color { 0x000000 };
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Color m_background_color;
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Color m_foreground_color;
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RetainPtr<Font> m_font;
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SizePolicy m_horizontal_size_policy { SizePolicy::Fill };
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@ -59,6 +59,8 @@ void GWindow::show()
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request.type = WSAPI_ClientMessage::Type::CreateWindow;
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request.window_id = m_window_id;
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request.window.rect = m_rect_when_windowless;
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request.window.has_alpha_channel = m_has_alpha_channel;
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request.window.opacity = m_opacity_when_windowless;
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ASSERT(m_title_when_windowless.length() < sizeof(request.text));
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strcpy(request.text, m_title_when_windowless.characters());
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request.text_length = m_title_when_windowless.length();
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@ -280,3 +282,22 @@ void GWindow::set_global_cursor_tracking_widget(GWidget* widget)
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// Maybe there could be a response that includes the current cursor location as of enabling.
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GEventLoop::main().post_message_to_server(request);
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}
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void GWindow::set_has_alpha_channel(bool value)
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{
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ASSERT(!m_window_id);
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m_has_alpha_channel = value;
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}
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void GWindow::set_opacity(float opacity)
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{
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m_opacity_when_windowless = opacity;
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if (!m_window_id)
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return;
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WSAPI_ClientMessage request;
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request.type = WSAPI_ClientMessage::Type::SetWindowOpacity;
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request.window_id = m_window_id;
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request.window.opacity = opacity;
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m_opacity_when_windowless = opacity;
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GEventLoop::main().post_message_to_server(request);
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}
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@ -15,6 +15,9 @@ public:
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static GWindow* from_window_id(int);
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void set_has_alpha_channel(bool);
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void set_opacity(float);
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int window_id() const { return m_window_id; }
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String title() const;
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@ -66,13 +69,15 @@ private:
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RetainPtr<GraphicsBitmap> m_backing;
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int m_window_id { 0 };
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bool m_is_active { false };
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float m_opacity_when_windowless { 1.0f };
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GWidget* m_main_widget { nullptr };
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GWidget* m_focused_widget { nullptr };
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WeakPtr<GWidget> m_global_cursor_tracking_widget;
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Rect m_rect_when_windowless;
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String m_title_when_windowless;
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Vector<Rect> m_pending_paint_event_rects;
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bool m_is_active { false };
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bool m_should_exit_app_on_close { false };
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bool m_has_alpha_channel { false };
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};
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