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WindowServer: Support windows with alpha channels. And per-WSWindow opacity.

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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
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10
WindowServer/WSWindow.h
View file

@ -25,6 +25,9 @@ public:
String title() const { return m_title; }
void set_title(String&&);
float opacity() const { return m_opacity; }
void set_opacity(float opacity) { m_opacity = opacity; }
int x() const { return m_rect.x(); }
int y() const { return m_rect.y(); }
int width() const { return m_rect.width(); }
@ -59,6 +62,9 @@ public:
void set_global_cursor_tracking_enabled(bool);
bool global_cursor_tracking() const { return m_global_cursor_tracking_enabled; }
bool has_alpha_channel() const { return m_has_alpha_channel; }
void set_has_alpha_channel(bool value) { m_has_alpha_channel = value; }
// For InlineLinkedList.
// FIXME: Maybe make a ListHashSet and then WSWindowManager can just use that.
WSWindow* m_next { nullptr };
@ -72,9 +78,9 @@ private:
bool m_is_being_dragged { false };
bool m_global_cursor_tracking_enabled { false };
bool m_visible { true };
bool m_has_alpha_channel { false };
WSMenu* m_menu { nullptr };
RetainPtr<GraphicsBitmap> m_backing;
int m_window_id { -1 };
float m_opacity { 1 };
};