1 files changed, 9 insertions, 1 deletions
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 9b1f768..00461b0 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -813,6 +813,10 @@ bool SkCanvas::clipRect(const SkRect& rect, SkRegion::Op op) {
     fLocalBoundsCompareTypeDirty = true;
 
     if (fMCRec->fMatrix->rectStaysRect()) {
+        // for these simpler matrices, we can stay a rect ever after applying
+        // the matrix. This means we don't have to a) make a path, and b) tell
+        // the region code to scan-convert the path, only to discover that it
+        // is really just a rect.
         SkRect      r;
         SkIRect     ir;
 
@@ -820,10 +824,14 @@ bool SkCanvas::clipRect(const SkRect& rect, SkRegion::Op op) {
         r.round(&ir);
         return fMCRec->fRegion->op(ir, op);
     } else {
+        // since we're rotate or some such thing, we convert the rect to a path
+        // and clip against that, since it can handle any matrix. However, to
+        // avoid recursion in the case where we are subclassed (e.g. Pictures)
+        // we explicitly call "our" version of clipPath.
         SkPath  path;
 
         path.addRect(rect);
-        return this->clipPath(path, op);
+        return this->SkCanvas::clipPath(path, op);
     }
 }