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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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25 changed files with 244 additions and 71 deletions
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@ -34,7 +34,7 @@ public:
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void draw_line(const Point&, const Point&, Color);
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void draw_focus_rect(const Rect&);
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void blit(const Point&, const GraphicsBitmap&, const Rect& src_rect);
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void blit_with_alpha(const Point&, const GraphicsBitmap&, const Rect& src_rect);
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void blit_with_opacity(const Point&, const GraphicsBitmap&, const Rect& src_rect, float opacity);
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void draw_text(const Rect&, const String&, TextAlignment = TextAlignment::TopLeft, Color = Color());
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void draw_glyph(const Point&, char, Color);
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@ -58,6 +58,7 @@ public:
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private:
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void set_pixel_with_draw_op(dword& pixel, const Color&);
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void fill_rect_with_draw_op(const Rect&, Color);
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void blit_with_alpha(const Point&, const GraphicsBitmap&, const Rect& src_rect);
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const Font* m_font;
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Point m_translation;
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