Clipping performance improvements

Create a ClipArea class to handle tracking clip regions. This class can
select the most efficient implementation depending on the types of
clipping presented.

ClipArea re-used the rectangle and region-based clipping
implementations as well as adding a "list of rotated rectangles"
approach that is more efficient for rotated views with children.

Change-Id: I2133761a2462ebc0852b394220e265974b3086f0

1 files changed, 7 insertions, 3 deletions

diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 9d9b3d25dcd8..f6131831b152 100755
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -223,9 +223,6 @@ public:
         return mCaches;
     }
 
-    // simple rect clip
-    bool isCurrentClipSimple() { return mState.isCurrentClipSimple(); }
-
     int getViewportWidth() { return mState.getViewportWidth(); }
     int getViewportHeight() { return mState.getViewportHeight(); }
 
@@ -433,6 +430,13 @@ protected:
      */
     void attachStencilBufferToLayer(Layer* layer);
 
+    /**
+     * Draw a rectangle list. Currently only used for the the stencil buffer so that the stencil
+     * will have a value of 'n' in every unclipped pixel, where 'n' is the number of rectangles
+     * in the list.
+     */
+    void drawRectangleList(const RectangleList& rectangleList);
+
     bool quickRejectSetupScissor(float left, float top, float right, float bottom,
             const SkPaint* paint = nullptr);
     bool quickRejectSetupScissor(const Rect& bounds, const SkPaint* paint = nullptr) {