Sketch SkPMFloat

bench/PMFloatBench.cpp

+#include "Benchmark.h"
+#include "SkPMFloat.h"
+#include "SkRandom.h"
+
+struct PMFloatBench : public Benchmark {
+    explicit PMFloatBench(bool clamp) : fClamp(clamp) {}
+
+    const char* onGetName() SK_OVERRIDE { return fClamp ? "SkPMFloat_clamp" : "SkPMFloat_get"; }
+    bool isSuitableFor(Backend backend) SK_OVERRIDE { return backend == kNonRendering_Backend; }
+
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+        SkRandom rand;
+        for (int i = 0; i < loops; i++) {
+            SkPMColor c = SkPreMultiplyColor(rand.nextU());
+            SkPMFloat pmf;
+            pmf.set(c);
+            SkPMColor back = fClamp ? pmf.clamped() : pmf.get();
+            if (c != back) { SkFAIL("no joy"); }  // This conditional makes this not compile away.
+        }
+    }
+
+    bool fClamp;
+};
+DEF_BENCH(return new PMFloatBench( true);)
+DEF_BENCH(return new PMFloatBench(false);)