Widen the set of nested rects that can be drawn natively on the GPU

src/gpu/GrAARectRenderer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAARectRenderer.h"
 #include "GrGpu.h"
 #include "gl/builders/GrGLProgramBuilder.h"
@@ skipping 840 matching lines @@
     // We create vertices for four nested rectangles. There are two ramps from 0 to full
     // coverage, one on the exterior of the stroke and the other on the interior.
     // The following pointers refer to the four rects, from outermost to innermost.
     SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
     SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vstride);
     SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vstride);
     SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(verts + (2 * outerVertexNum + innerVertexNum) * vstride);
 
 #ifndef SK_IGNORE_THIN_STROKED_RECT_FIX
     // TODO: this only really works if the X & Y margins are the same all around
-    // the rect
+    // the rect (or if they are all >= 1.0).
     SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight);
     inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft);
     inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop);
     if (miterStroke) {
         inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom);
     } else {
         inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom - devInside.fBottom);
     }
     SkASSERT(inset >= 0);
 #else
@@ skipping 89 matching lines @@
     // can't call mapRect for devInside since it calls sort
     combinedMatrix.mapPoints((SkPoint*)&devInside, (const SkPoint*)&rects[1], 2);
 
     if (devInside.isEmpty()) {
         this->fillAARect(gpu, target, devOutside, SkMatrix::I(), devOutside);
         return;
     }
 
     this->geometryStrokeAARect(gpu, target, devOutside, devOutsideAssist, devInside, true);
 }