add SkCanvas::drawDRRect

gm/drrect.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 "gm.h"
+#include "SkCanvas.h"
+#include "SkRRect.h"
+#include "SkPath.h"
+
+class DRRectGM : public skiagm::GM {
+public:
+    DRRectGM() {}
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("drrect");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return SkISize::Make(640, 480);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkPaint paint;
+        paint.setAntiAlias(true);
+
+        SkRRect outers[4];
+        // like squares/circles, to exercise fast-cases in GPU
+        SkRect r = { 0, 0, 100, 100 };
+        SkVector radii[4] = {
+            { 0, 0 }, { 30, 1 }, { 10, 40 }, { 40, 40 }
+        };
+        
+        const SkScalar dx = r.width() + 16;
+        const SkScalar dy = r.height() + 16;
+
+        outers[0].setRect(r);
+        outers[1].setOval(r);
+        outers[2].setRectXY(r, 20, 20);
+        outers[3].setRectRadii(r, radii);
+
+        SkRRect inners[5];
+        r.inset(25, 25);
+
+        inners[0].setEmpty();
+        inners[1].setRect(r);
+        inners[2].setOval(r);
+        inners[3].setRectXY(r, 20, 20);
+        inners[4].setRectRadii(r, radii);
+
+        canvas->translate(16, 16);
+        for (size_t j = 0; j < SK_ARRAY_COUNT(inners); ++j) {
+            for (size_t i = 0; i < SK_ARRAY_COUNT(outers); ++i) {
+                canvas->save();
+                canvas->translate(dx * j, dy * i);
+                canvas->drawDRRect(outers[i], inners[j], paint);
+                canvas->restore();
+            }
+        }
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+DEF_GM( return new DRRectGM; )