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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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@ -17,7 +17,7 @@ int main(int argc, char** argv)
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window->set_main_widget(widget);
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auto* icon_label = new GLabel(widget);
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icon_label->set_icon(GraphicsBitmap::load_from_file("/res/icons/Serenity.rgb", { 32, 32 }));
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icon_label->set_icon(GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, "/res/icons/Serenity.rgb", { 32, 32 }));
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icon_label->set_relative_rect(
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widget->rect().center().x() - 16,
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10,
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