1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 04:27:45 +00:00

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. :^)
This commit is contained in:
Andreas Kling 2019-02-19 01:42:53 +01:00
parent d4973842c9
commit 9b71307d49
25 changed files with 244 additions and 71 deletions

View file

@ -36,7 +36,7 @@ void GButton::paint_event(GPaintEvent&)
icon_location.move_by(1, 1);
}
if (m_icon) {
painter.blit_with_alpha(icon_location, *m_icon, m_icon->rect());
painter.blit(icon_location, *m_icon, m_icon->rect());
painter.draw_text(content_rect, caption(), TextAlignment::Center, Color::Black);
} else {
painter.draw_text(content_rect, caption(), TextAlignment::Center, Color::Black);

View file

@ -31,7 +31,7 @@ void GLabel::paint_event(GPaintEvent&)
painter.fill_rect({ 0, 0, width(), height() }, background_color());
if (m_icon) {
auto icon_location = rect().center().translated(-(m_icon->width() / 2), -(m_icon->height() / 2));
painter.blit_with_alpha(icon_location, *m_icon, m_icon->rect());
painter.blit(icon_location, *m_icon, m_icon->rect());
}
if (!text().is_empty())
painter.draw_text({ 0, 0, width(), height() }, text(), m_text_alignment, foreground_color());

View file

@ -128,8 +128,8 @@ private:
OwnPtr<GLayout> m_layout;
Rect m_relative_rect;
Color m_background_color { 0xffffff };
Color m_foreground_color { 0x000000 };
Color m_background_color;
Color m_foreground_color;
RetainPtr<Font> m_font;
SizePolicy m_horizontal_size_policy { SizePolicy::Fill };

View file

@ -59,6 +59,8 @@ void GWindow::show()
request.type = WSAPI_ClientMessage::Type::CreateWindow;
request.window_id = m_window_id;
request.window.rect = m_rect_when_windowless;
request.window.has_alpha_channel = m_has_alpha_channel;
request.window.opacity = m_opacity_when_windowless;
ASSERT(m_title_when_windowless.length() < sizeof(request.text));
strcpy(request.text, m_title_when_windowless.characters());
request.text_length = m_title_when_windowless.length();
@ -280,3 +282,22 @@ void GWindow::set_global_cursor_tracking_widget(GWidget* widget)
// Maybe there could be a response that includes the current cursor location as of enabling.
GEventLoop::main().post_message_to_server(request);
}
void GWindow::set_has_alpha_channel(bool value)
{
ASSERT(!m_window_id);
m_has_alpha_channel = value;
}
void GWindow::set_opacity(float opacity)
{
m_opacity_when_windowless = opacity;
if (!m_window_id)
return;
WSAPI_ClientMessage request;
request.type = WSAPI_ClientMessage::Type::SetWindowOpacity;
request.window_id = m_window_id;
request.window.opacity = opacity;
m_opacity_when_windowless = opacity;
GEventLoop::main().post_message_to_server(request);
}

View file

@ -15,6 +15,9 @@ public:
static GWindow* from_window_id(int);
void set_has_alpha_channel(bool);
void set_opacity(float);
int window_id() const { return m_window_id; }
String title() const;
@ -66,13 +69,15 @@ private:
RetainPtr<GraphicsBitmap> m_backing;
int m_window_id { 0 };
bool m_is_active { false };
float m_opacity_when_windowless { 1.0f };
GWidget* m_main_widget { nullptr };
GWidget* m_focused_widget { nullptr };
WeakPtr<GWidget> m_global_cursor_tracking_widget;
Rect m_rect_when_windowless;
String m_title_when_windowless;
Vector<Rect> m_pending_paint_event_rects;
bool m_is_active { false };
bool m_should_exit_app_on_close { false };
bool m_has_alpha_channel { false };
};