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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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29
WindowServer/WSMessage.h
View file

@ -39,6 +39,7 @@ public:
APIDidFinishPaintingNotification,
APIGetWindowBackingStoreRequest,
APISetGlobalCursorTrackingRequest,
APISetWindowOpacityRequest,
__End_API_Client_Requests,
};
@ -253,6 +254,26 @@ private:
int m_window_id { 0 };
};
class WSAPISetWindowOpacityRequest final : public WSAPIClientRequest {
public:
explicit WSAPISetWindowOpacityRequest(int client_id, int window_id, float opacity)
: WSAPIClientRequest(WSMessage::APISetWindowOpacityRequest, client_id)
, m_client_id(client_id)
, m_window_id(window_id)
, m_opacity(opacity)
{
}
int client_id() const { return m_client_id; }
int window_id() const { return m_window_id; }
float opacity() const { return m_opacity; }
private:
int m_client_id { 0 };
int m_window_id { 0 };
float m_opacity { 0 };
};
class WSAPISetWindowRectRequest final : public WSAPIClientRequest {
public:
explicit WSAPISetWindowRectRequest(int client_id, int window_id, const Rect& rect)
@ -292,19 +313,25 @@ private:
class WSAPICreateWindowRequest : public WSAPIClientRequest {
public:
WSAPICreateWindowRequest(int client_id, const Rect& rect, const String& title)
WSAPICreateWindowRequest(int client_id, const Rect& rect, const String& title, bool has_alpha_channel, float opacity)
: WSAPIClientRequest(WSMessage::APICreateWindowRequest, client_id)
, m_rect(rect)
, m_title(title)
, m_opacity(opacity)
, m_has_alpha_channel(has_alpha_channel)
{
}
Rect rect() const { return m_rect; }
String title() const { return m_title; }
bool has_alpha_channel() const { return m_has_alpha_channel; }
float opacity() const { return m_opacity; }
private:
Rect m_rect;
String m_title;
float m_opacity { 0 };
bool m_has_alpha_channel { false };
};
class WSAPIDestroyWindowRequest : public WSAPIClientRequest {