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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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@ -302,7 +302,7 @@ void WSMessageLoop::on_receive_from_client(int client_id, const WSAPI_ClientMess
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break;
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case WSAPI_ClientMessage::Type::CreateWindow:
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ASSERT(message.text_length < sizeof(message.text));
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post_message(client, make<WSAPICreateWindowRequest>(client_id, message.window.rect, String(message.text, message.text_length)));
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post_message(client, make<WSAPICreateWindowRequest>(client_id, message.window.rect, String(message.text, message.text_length), message.window.has_alpha_channel, message.window.opacity));
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break;
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case WSAPI_ClientMessage::Type::DestroyWindow:
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post_message(client, make<WSAPIDestroyWindowRequest>(client_id, message.window_id));
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