Add new GM for occluded blurmask filter draws

tools/sk_tool_utils.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "sk_tool_utils.h"
 #include "sk_tool_utils_flags.h"
 
@@ skipping 495 matching lines @@
     if (!radii.isZero()) {
         SkPoint p = intersection(radii.fX, radii.fY);
 
         newL = SkTMax(newL, r.fLeft + radii.fX - p.fX);
         newB = SkTMin(newB, r.fBottom - radii.fY + p.fY);
     }
 
     return SkRect::MakeLTRB(newL, newT, newR, newB);
 }
 
+// The widest inset rect
+SkRect compute_widest_occluder(const SkRRect& rr) {
+    const SkRect& r = rr.getBounds();
+
+    const SkVector& ul = rr.radii(SkRRect::kUpperLeft_Corner);
+    const SkVector& ur = rr.radii(SkRRect::kUpperRight_Corner);
+    const SkVector& lr = rr.radii(SkRRect::kLowerRight_Corner);
+    const SkVector& ll = rr.radii(SkRRect::kLowerLeft_Corner);
+
+    SkScalar maxT = SkTMax(ul.fY, ur.fY);
+    SkScalar maxB = SkTMax(ll.fY, lr.fY);
+
+    return SkRect::MakeLTRB(r.fLeft, r.fTop + maxT, r.fRight, r.fBottom - maxB);
+
+}
+
+// The tallest inset rect
+SkRect compute_tallest_occluder(const SkRRect& rr) {
+    const SkRect& r = rr.getBounds();
+
+    const SkVector& ul = rr.radii(SkRRect::kUpperLeft_Corner);
+    const SkVector& ur = rr.radii(SkRRect::kUpperRight_Corner);
+    const SkVector& lr = rr.radii(SkRRect::kLowerRight_Corner);
+    const SkVector& ll = rr.radii(SkRRect::kLowerLeft_Corner);
+
+    SkScalar maxL = SkTMax(ul.fX, ll.fX);
+    SkScalar maxR = SkTMax(ur.fX, lr.fX);
+
+    return SkRect::MakeLTRB(r.fLeft + maxL, r.fTop, r.fRight - maxR, r.fBottom);
+}
+
+
 }  // namespace sk_tool_utils