Add rotated rects benchmarks

bench/RotatedRectBench.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 "Benchmark.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+
+/** This benchmark tests rendering rotated rectangles. It can optionally apply AA and/or change the
+    paint color between each rect. */
+class RotRectBench: public Benchmark {
+public:
+    RotRectBench(bool aa, bool changeColor)
+        : fAA(aa)
+        , fChangeColor(changeColor) {
+        this->makeName();
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE { return fName.c_str(); }
+
+    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+        SkPaint paint;
+        paint.setAntiAlias(fAA);
+        SkColor color = 0xFF000000;
+
+        int w = canvas->getBaseLayerSize().width();
+        int h = canvas->getBaseLayerSize().height();
+
+        static const SkScalar kRectW = 25.1f;
+        static const SkScalar kRectH = 25.9f;
+
+        SkMatrix rotate;
+        // This value was chosen so that we frequently hit the axis-aligned case.
+        rotate.setRotate(30.f, kRectW / 2, kRectH / 2);
+        SkMatrix m = rotate;
+
+        SkScalar tx = 0, ty = 0;
+
+        for (int i = 0; i < loops; ++i) {
+            canvas->save();
+            canvas->translate(tx, ty);
+            canvas->concat(m);
+            paint.setColor(color);
+            if (fChangeColor) {
+                color += 0x010203;
+                color |= 0xFF000000;
+            }
+            canvas->drawRect(SkRect::MakeWH(kRectW, kRectH), paint);
+            canvas->restore();
+
+            tx += kRectW + 2;
+            if (tx > w) {
+                tx = 0;
+                ty += kRectH + 2;
+                if (ty > h) {
+                    ty = 0;
+                }
+            }
+
+            m.postConcat(rotate);
+        }
+    }
+
+private:
+    void makeName() {
+        fName = "rotated_rects";
+        if (fAA) {
+            fName.append("_aa");
+        } else {
+            fName.append("_bw");
+        }
+        if (fChangeColor) {
+            fName.append("_change_color");
+        } else {
+            fName.append("_same_color");
+        }
+    }
+
+    bool     fAA;
+    bool     fChangeColor;
+    SkString fName;
+
+    typedef Benchmark INHERITED;
+};
+
+DEF_BENCH(return new RotRectBench(true, true);)
+DEF_BENCH(return new RotRectBench(true, false);)
+DEF_BENCH(return new RotRectBench(false, true);)
+DEF_BENCH(return new RotRectBench(false, false);)