test+bench new swizzle SkOpts

bench/SwizzleBench.cpp

+/*
+ * Copyright 2016 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 "SkOpts.h"
+
+class SwizzleBench : public Benchmark {
+public:
+    SwizzleBench(const char* name, SkOpts::Swizzle_8888_8888 fn) : fName(name), fFn(fn) {}
+
+    bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
+    const char* onGetName() override { return fName; }
+    void onDraw(int loops, SkCanvas*) override {
+        static const int K = 1023; // Arbitrary, but nice to be a non-power-of-two to trip up SIMD.
+        uint32_t dst[K], src[K];
+        while (loops --> 0) {
+            fFn(dst, src, K);
+        }
+    }
+private:
+    const char* fName;
+    SkOpts::Swizzle_8888_8888 fFn;
+};
+
+
+DEF_BENCH(return new SwizzleBench("SkOpts::premul_xxxa", SkOpts::premul_xxxa));
+DEF_BENCH(return new SwizzleBench("SkOpts::swaprb_xxxa", SkOpts::swaprb_xxxa));
+DEF_BENCH(return new SwizzleBench("SkOpts::premul_swaprb_xxxa", SkOpts::premul_swaprb_xxxa));