convex path renderer unit tests

src/gpu/GrTestUtils.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTestUtils.h"
 #include "SkMatrix.h"
 #include "SkPath.h"
@@ skipping 157 matching lines @@
         gPath[6].lineTo(5.0f, 5.0f);
         gPath[6].lineTo(10.0f, 0.0f);
         gPath[6].lineTo(10.0f, 10.0f);
         gPath[6].lineTo(0.0f, 10.0f);
         gPath[6].close();
     }
 
     return gPath[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gPath)))];
 }
 
+const SkPath& TestPathConvex(SkRandom* random) {
+    static SkPath gPath[3];
+    static bool gOnce;
+    if (!gOnce) {
+        gOnce = true;
+        // narrow rect
+        gPath[0].moveTo(0.f, 0.f);
+        gPath[0].lineTo(-1.5f, -50.0f);
+        gPath[0].lineTo( 1.5f, -50.0f);
+        gPath[0].lineTo( 1.5f,  50.0f);
+        gPath[0].lineTo(-1.5f,  50.0f);
+        // degenerate
+        gPath[1].moveTo(0.f, 0.f);
+        gPath[1].lineTo(-0.025f, -0.025f);
+        gPath[1].lineTo( 0.025f, -0.025f);
+        gPath[1].lineTo( 0.025f,  0.025f);
+        gPath[1].lineTo(-0.025f,  0.025f);
+        // clipped triangle
+        gPath[2].moveTo(0.f, 0.f);
+        gPath[2].lineTo(-10.0f, -50.0f);
+        gPath[2].lineTo( 10.0f, -50.0f);
+        gPath[2].lineTo( 50.0f,  31.0f);
+        gPath[2].lineTo( 40.0f,  50.0f);
+        gPath[2].lineTo(-40.0f,  50.0f);
+        gPath[2].lineTo(-50.0f,  31.0f);
+    }
+
+    return gPath[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gPath)))];
+}
+
 SkStrokeRec TestStrokeRec(SkRandom* random) {
     SkStrokeRec::InitStyle style =
             SkStrokeRec::InitStyle(random->nextULessThan(SkStrokeRec::kFill_InitStyle + 1));
     SkStrokeRec rec(style);
     bool strokeAndFill = random->nextBool();
     SkScalar strokeWidth = random->nextBool() ? 0.f : 1.f;
     rec.setStrokeStyle(strokeWidth, strokeAndFill);
 
     SkPaint::Cap cap = SkPaint::Cap(random->nextULessThan(SkPaint::kCapCount));
     SkPaint::Join join = SkPaint::Join(random->nextULessThan(SkPaint::kJoinCount));
     SkScalar miterLimit = random->nextRangeScalar(1.f, 5.f);
     rec.setStrokeParams(cap, join, miterLimit);
     return rec;
 }
 
 };
 
 #endif