Add support for clipstack to Gr. GrClip is now a list of rects and paths with set operations to combine them. The stencil buffer is used to perform the set operations to put the clip into the stencil buffer. Building Gr's clip from Skia's clipStack is currently disabled due to the fact that Skia's clipStack is relative to the root layer not the current layer. This will be fixed in a subsequent CL.

git-svn-id: http://skia.googlecode.com/svn/trunk@878 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 20 insertions, 0 deletions

diff --git a/gpu/include/GrTypes.h b/gpu/include/GrTypes.h
index 02a652a4c1..29e847fd09 100644
--- a/gpu/include/GrTypes.h
+++ b/gpu/include/GrTypes.h
@@ -201,6 +201,26 @@ enum GrBlendCoeff {
     kIDA_BlendCoeff,     //<! one minus dst alpha
 };
 
+/**
+ * Set Operations used to construct clips.
+ */
+enum GrSetOp {
+    kReplace_SetOp,
+    kIntersect_SetOp,
+    kUnion_SetOp,
+    kXor_SetOp,
+    kDifference_SetOp,
+    kReverseDifference_SetOp,
+};
+
+/**
+ * Clips are composed from these objects.
+ */
+enum GrClipType {
+    kRect_ClipType,
+    kPath_ClipType
+};
+
 ///////////////////////////////////////////////////////////////////////////////
 
 // this is included only to make it easy to use this debugging facility