Add a clip mask bench

Change-Id: I230729492fc23e290136f7d62610abe5ca51c067
Reviewed-on: https://skia-review.googlesource.com/14941
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>

bench/ClipMaskBench.cpp

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2017 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 "sk_tool_utils.h"
+#include "SkCanvas.h"
+#include "SkColorSpace.h"
+#include "SkImage.h"
+#include "SkPictureRecorder.h"
+#include "SkString.h"
+#include "SkSurface.h"
+
+static void DrawMask(SkCanvas* canvas) {
+    sk_tool_utils::draw_checkerboard(canvas, SK_ColorTRANSPARENT, SK_ColorGREEN, 10);
+}
+
+class ClipMaskBench : public Benchmark {
+public:
+    using MaskMakerFunc = sk_sp<SkImage> (*)(int);
+
+    ClipMaskBench(const char name[], const MaskMakerFunc maskMaker)
+        : fName(SkStringPrintf("clipmask_%s", name))
+        , fClip(maskMaker(kSize)) {}
+
+protected:
+    const char* onGetName() override { return fName.c_str(); }
+
+    void onDraw(int loops, SkCanvas* canvas) override {
+        SkCanvas::SaveLayerRec rec(nullptr, nullptr, nullptr, fClip, nullptr, 0);
+
+        for (int i = 0; i < loops; ++i) {
+            canvas->saveLayer(rec);
+            canvas->drawColor(SK_ColorBLUE);
+            canvas->restore();
+        }
+    }
+
+private:
+    static constexpr int kSize = 400;
+
+    SkString       fName;
+    sk_sp<SkImage> fClip;
+};
+
+DEF_BENCH(return new ClipMaskBench("a8", [](int size) -> sk_sp<SkImage> {
+    sk_sp<SkSurface> surface = SkSurface::MakeRaster(SkImageInfo::MakeA8(size, size));
+    DrawMask(surface->getCanvas());
+    return surface->makeImageSnapshot();
+});)
+
+DEF_BENCH(return new ClipMaskBench("8888", [](int size) -> sk_sp<SkImage> {
+    sk_sp<SkSurface> surface = SkSurface::MakeRasterN32Premul(size, size);
+    DrawMask(surface->getCanvas());
+    return surface->makeImageSnapshot();
+});)
+
+DEF_BENCH(return new ClipMaskBench("picture", [](int size) -> sk_sp<SkImage> {
+    SkPictureRecorder recorder;
+    DrawMask(recorder.beginRecording(size, size));
+    return SkImage::MakeFromPicture(recorder.finishRecordingAsPicture(), SkISize::Make(size, size),
+                                    nullptr, nullptr, SkImage::BitDepth::kU8,
+                                    SkColorSpace::MakeSRGB());
+});)
+

gn/bench.gni

@@ -27,6 +27,7 @@ bench_sources = [
   "$_bench/ChartBench.cpp",
   "$_bench/ChecksumBench.cpp",
   "$_bench/ChromeBench.cpp",
+  "$_bench/ClipMaskBench.cpp",
   "$_bench/CmapBench.cpp",
   "$_bench/CodecBench.cpp",
   "$_bench/ColorCanvasDrawBitmapBench.cpp",