Optimized single-rect clip case in OpenGL 2 paint engine.

Use scissor based clipping when only dealing with rectangular intersect
clips. As soon as we get any more complex clips (or unite/replace clips)
we fall back to depth buffer based clipping.

Task-number: 258748
Reviewed-by: Tom

1 files changed, 3 insertions, 0 deletions

diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
index ec447a3..906817b 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
@@ -86,6 +86,8 @@ public:
     qreal maxDepth;
 
     bool canRestoreClip;
+    QRect rectangleClip;
+    bool hasRectangleClip;
 };
 
 
@@ -217,6 +219,7 @@ public:
 
     void writeClip(const QVectorPath &path, float depth);
     void updateDepthScissorTest();
+    void setScissor(const QRect &rect);
     void regenerateDepthClip();
     void systemStateChanged();
     uint use_system_clip : 1;