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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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19
SharedGraphics/GraphicsBitmap.h
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@ -9,10 +9,12 @@
class GraphicsBitmap : public Retainable<GraphicsBitmap> {
public:
static RetainPtr<GraphicsBitmap> create(const Size&);
static RetainPtr<GraphicsBitmap> create_wrapper(const Size&, RGBA32*);
static RetainPtr<GraphicsBitmap> load_from_file(const String& path, const Size&);
static RetainPtr<GraphicsBitmap> create_with_shared_buffer(int shared_buffer_id, const Size&, RGBA32* buffer = nullptr);
enum class Format { Invalid, RGB32, RGBA32 };
static RetainPtr<GraphicsBitmap> create(Format, const Size&);
static RetainPtr<GraphicsBitmap> create_wrapper(Format, const Size&, RGBA32*);
static RetainPtr<GraphicsBitmap> load_from_file(Format, const String& path, const Size&);
static RetainPtr<GraphicsBitmap> create_with_shared_buffer(Format, int shared_buffer_id, const Size&, RGBA32* buffer = nullptr);
~GraphicsBitmap();
RGBA32* scanline(int y);
@ -25,14 +27,17 @@ public:
size_t pitch() const { return m_pitch; }
int shared_buffer_id() const { return m_shared_buffer_id; }
bool has_alpha_channel() const { return m_format == Format::RGBA32; }
private:
GraphicsBitmap(const Size&);
GraphicsBitmap(const Size&, RGBA32*);
GraphicsBitmap(int shared_buffer_id, const Size&, RGBA32*);
GraphicsBitmap(Format, const Size&);
GraphicsBitmap(Format, const Size&, RGBA32*);
GraphicsBitmap(Format, int shared_buffer_id, const Size&, RGBA32*);
Size m_size;
RGBA32* m_data { nullptr };
size_t m_pitch { 0 };
Format m_format { Format::Invalid };
bool m_mmaped { false };
int m_shared_buffer_id { -1 };
};