Pre-crop filled rects to avoid scissor

include/core/SkRect.h

Index: include/core/SkRect.h
diff --git a/include/core/SkRect.h b/include/core/SkRect.h
index 39cbb330f82b207cd6a508570fe41f1372353590..b8890976fedd8ebda9cb0ee4d5f7034f4e48bf74 100644
--- a/include/core/SkRect.h
+++ b/include/core/SkRect.h
@@ -257,6 +257,11 @@ struct SK_API SkIRect {
     */
     bool contains(const SkRect& r) const;
 
+    /** Returns true if the rectangle r is contained by the would-be non-integer rectangle that
+     *  results from outsetting this rectangle by "fuzz".
+    */
+    bool fuzzyContains(const SkRect& r, SkScalar fuzz) const;

[bsalomon, 2016/07/08 22:49:00]

Instead of adding this to the public API, can we just add it as a helper
function in GrClipMaskManager.cpp?

+
     /** Return true if this rectangle contains the specified rectangle.
         For speed, this method does not check if either this or the specified
         rectangles are empty, and if either is, its return value is undefined.
@@ -902,4 +907,11 @@ inline bool SkIRect::contains(const SkRect& r) const {
             (SkScalar)fRight >= r.fRight && (SkScalar)fBottom >= r.fBottom;
 }
 
+inline bool SkIRect::fuzzyContains(const SkRect& r, SkScalar fuzz) const {
+    SkASSERT(fuzz >= 0);
+    return  !r.isEmpty() && !this->isEmpty() &&     // check for empties
+            (SkScalar)fLeft <= (r.fLeft + fuzz) && (SkScalar)fTop <= (r.fTop + fuzz) &&
+            (SkScalar)fRight >= (r.fRight - fuzz) && (SkScalar)fBottom >= (r.fBottom - fuzz);
+}
+
 #endif