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Let userland retain the window backing store while drawing into it.

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To start painting, call:
gui$get_window_backing_store()

Then finish up with:
gui$release_window_backing_store()

Process will retain the underlying GraphicsBitmap behind the scenes.
This fixes racing between the WindowServer and GUI clients.

This patch also adds a WSWindowLocker that is exactly what it sounds like.
This commit is contained in:
Andreas Kling 2019-01-24 23:40:12 +01:00
parent ccf3fc4618
commit 86eae0f8df
22 changed files with 244 additions and 102 deletions
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5
SharedGraphics/Painter.h
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@ -40,8 +40,8 @@ public:
void set_draw_op(DrawOp op) { m_draw_op = op; }
DrawOp draw_op() const { return m_draw_op; }
void set_clip_rect(const Rect& rect) { m_clip_rect = rect; }
void clear_clip_rect() { m_clip_rect = { 0, 0, 1024, 768 }; }
void set_clip_rect(const Rect& rect);
void clear_clip_rect();
Rect clip_rect() const { return m_clip_rect; }
private:
@ -53,6 +53,7 @@ private:
RetainPtr<GraphicsBitmap> m_target;
#ifdef LIBGUI
GWindow* m_window { nullptr };
void* m_backing_store_id { nullptr };
#endif
DrawOp m_draw_op { DrawOp::Copy };
};