Add initial CurveMeasure code

bench/MeasureBench.cpp

Index: bench/MeasureBench.cpp
diff --git a/bench/MeasureBench.cpp b/bench/MeasureBench.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d76bd3568c20be4aceed1a95b4be045209173814
--- /dev/null
+++ b/bench/MeasureBench.cpp
@@ -0,0 +1,177 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+// for std::max
+#include <algorithm>
+
+#include "Benchmark.h"
+#include "SkCurveMeasure.h"
+#include "SkPath.h"
+#include "SkPathMeasure.h"
+#include "SkString.h"
+
+#define NORMALIZE_LOOPS
+
+class MeasureBench : public Benchmark {
+   protected:
+    SkString fName;
+
+    SkPath fPath;
+
+    bool fUsePathMeasure;
+    float fSize;
+    size_t fPieces;
+
+    SkPoint fPts[3];
+
+   public:
+    MeasureBench(bool usePathMeasure, float size, size_t pieces)
+        : fUsePathMeasure(usePathMeasure),
+          fSize(size),
+          fPieces(pieces) {
+        fName.printf("measure_%s_%.1f_" SK_SIZE_T_SPECIFIER,
+                     fUsePathMeasure ? "pathMeasure" : "curveMeasure", fSize,
+                     fPieces);
+
+        auto p1 = SkPoint::Make(0, 0);
+        auto p2 = SkPoint::Make(30*fSize, 0);
+        auto p3 = SkPoint::Make(15*fSize, 15*fSize);
+
+        fPts[0] = p1;
+        fPts[1] = p2;
+        fPts[2] = p3;
+
+        this->setPath();
+    }
+
+   protected:
+    const char* onGetName() override { return fName.c_str(); }
+
+    void setPath() {
+        fPath.moveTo(fPts[0]);
+        fPath.quadTo(fPts[1], fPts[2]);
+    }
+
+    int numLoops() {
+#ifdef NORMALIZE_LOOPS
+        // arbitrary heuristic
+        return std::max(2, 10000 / ((int)fSize*(int)fPieces));
+#else
+        return 1000;
+#endif // NORMALIZE_LOOPS
+    }
+
+    //// measurement code
+
+    void do_pathMeasure(SkCanvas* canvas) {
+        SkPathMeasure meas(fPath, false);
+
+        SkScalar totalLength = meas.getLength();
+        SkScalar pieceLength = totalLength / fPieces;
+
+        SkPoint point;
+        for (size_t i = 0; i <= fPieces; i++) {
+            if (meas.getPosTan(i * pieceLength, &point, nullptr)) {
+            };
+        }
+    }
+
+    void do_curveMeasure(SkCanvas* canvas) {
+        SkCurveMeasure meas(fPts, kQuad_SegType);
+
+        SkScalar totalLength = meas.getLength();
+        SkScalar pieceLength = totalLength / fPieces;
+
+        SkPoint point;
+        for (size_t i = 0; i <= fPieces; i++) {
+            meas.getPosTan(i*pieceLength, &point, nullptr);
+        }
+    }
+
+    void onDraw(int loops, SkCanvas* canvas) override {
+        int inner_loops = numLoops();
+        for (int i = 0; i < loops; i++) {
+            for (int j = 0; j < inner_loops; j++) {
+                if (fUsePathMeasure) {
+                    do_pathMeasure(canvas);
+                }
+                else {
+                    do_curveMeasure(canvas);
+                }
+            }
+        }
+    }
+
+   private:
+    typedef Benchmark INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+DEF_BENCH(return new MeasureBench(true, 1, 2);)
+DEF_BENCH(return new MeasureBench(true, 2, 2);)
+DEF_BENCH(return new MeasureBench(true, 10, 2);)
+DEF_BENCH(return new MeasureBench(true, 100, 2);)
+DEF_BENCH(return new MeasureBench(true, 1000, 2);)
+
+DEF_BENCH(return new MeasureBench(true, 1, 1);)
+DEF_BENCH(return new MeasureBench(true, 1, 2);)
+DEF_BENCH(return new MeasureBench(true, 1, 3);)
+DEF_BENCH(return new MeasureBench(true, 1, 4);)
+DEF_BENCH(return new MeasureBench(true, 1, 5);)
+DEF_BENCH(return new MeasureBench(true, 2, 1);)
+DEF_BENCH(return new MeasureBench(true, 2, 2);)
+DEF_BENCH(return new MeasureBench(true, 2, 3);)
+DEF_BENCH(return new MeasureBench(true, 2, 4);)
+DEF_BENCH(return new MeasureBench(true, 2, 5);)
+DEF_BENCH(return new MeasureBench(true, 10, 10);)
+DEF_BENCH(return new MeasureBench(true, 10, 20);)
+DEF_BENCH(return new MeasureBench(true, 10, 30);)
+DEF_BENCH(return new MeasureBench(true, 10, 40);)
+DEF_BENCH(return new MeasureBench(true, 10, 50);)
+DEF_BENCH(return new MeasureBench(true, 100, 100);)
+DEF_BENCH(return new MeasureBench(true, 100, 200);)
+DEF_BENCH(return new MeasureBench(true, 100, 300);)
+DEF_BENCH(return new MeasureBench(true, 100, 400);)
+DEF_BENCH(return new MeasureBench(true, 100, 500);)
+DEF_BENCH(return new MeasureBench(true, 1000, 1000);)
+DEF_BENCH(return new MeasureBench(true, 1000, 2000);)
+DEF_BENCH(return new MeasureBench(true, 1000, 3000);)
+DEF_BENCH(return new MeasureBench(true, 1000, 4000);)
+DEF_BENCH(return new MeasureBench(true, 1000, 5000);)
+
+DEF_BENCH(return new MeasureBench(false, 1, 2);)
+DEF_BENCH(return new MeasureBench(false, 2, 2);)
+DEF_BENCH(return new MeasureBench(false, 10, 2);)
+DEF_BENCH(return new MeasureBench(false, 100, 2);)
+DEF_BENCH(return new MeasureBench(false, 1000, 2);)
+
+DEF_BENCH(return new MeasureBench(false, 1, 1);)
+DEF_BENCH(return new MeasureBench(false, 1, 2);)
+DEF_BENCH(return new MeasureBench(false, 1, 3);)
+DEF_BENCH(return new MeasureBench(false, 1, 4);)
+DEF_BENCH(return new MeasureBench(false, 1, 5);)
+DEF_BENCH(return new MeasureBench(false, 2, 1);)
+DEF_BENCH(return new MeasureBench(false, 2, 2);)
+DEF_BENCH(return new MeasureBench(false, 2, 3);)
+DEF_BENCH(return new MeasureBench(false, 2, 4);)
+DEF_BENCH(return new MeasureBench(false, 2, 5);)
+DEF_BENCH(return new MeasureBench(false, 10, 10);)
+DEF_BENCH(return new MeasureBench(false, 10, 20);)
+DEF_BENCH(return new MeasureBench(false, 10, 30);)
+DEF_BENCH(return new MeasureBench(false, 10, 40);)
+DEF_BENCH(return new MeasureBench(false, 10, 50);)
+DEF_BENCH(return new MeasureBench(false, 100, 100);)
+DEF_BENCH(return new MeasureBench(false, 100, 200);)
+DEF_BENCH(return new MeasureBench(false, 100, 300);)
+DEF_BENCH(return new MeasureBench(false, 100, 400);)
+DEF_BENCH(return new MeasureBench(false, 100, 500);)
+DEF_BENCH(return new MeasureBench(false, 1000, 1000);)
+DEF_BENCH(return new MeasureBench(false, 1000, 2000);)
+DEF_BENCH(return new MeasureBench(false, 1000, 3000);)
+DEF_BENCH(return new MeasureBench(false, 1000, 4000);)
+DEF_BENCH(return new MeasureBench(false, 1000, 5000);)