Font cache stress test.

BUG=skia:

Review URL: https://codereview.chromium.org/1348883002

bench/SkGlyphCacheBench.cpp

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "SkGlyphCache.h"
+
+#include "Benchmark.h"
+#include "SkCanvas.h"
+#include "SkGlyphCache_Globals.h"
+#include "SkGraphics.h"
+#include "SkTaskGroup.h"
+#include "SkTypeface.h"
+#include "sk_tool_utils.h"
+
+
+static void do_font_stuff(SkPaint* paint) {
+    for (SkScalar i = 8; i < 64; i++) {
+        paint->setTextSize(i);
+        SkAutoGlyphCacheNoGamma autoCache(*paint, nullptr, nullptr);
+        SkGlyphCache* cache = autoCache.getCache();
+        uint16_t glyphs['z'];
+        for (int c = ' '; c < 'z'; c++) {
+            glyphs[c] = cache->unicharToGlyph(c);
+        }
+        for (int lookups = 0; lookups < 10; lookups++) {
+            for (int c = ' '; c < 'z'; c++) {
+                const SkGlyph& g = cache->getGlyphIDMetrics(glyphs[c]);
+                cache->findImage(g);
+            }
+        }
+
+    }
+}
+
+class SkGlyphCacheBasic : public Benchmark {
+public:
+    explicit SkGlyphCacheBasic(size_t cacheSize) : fCacheSize(cacheSize) { }
+
+protected:
+    const char* onGetName() override {
+        fName.printf("SkGlyphCacheBasic%dK", (int)(fCacheSize >> 10));
+        return fName.c_str();
+    }
+
+    bool isSuitableFor(Backend backend) override {
+        return backend == kNonRendering_Backend;
+    }
+
+    void onDraw(const int loops, SkCanvas*) override {
+        size_t oldCacheLimitSize = SkGraphics::GetFontCacheLimit();
+        SkGraphics::SetFontCacheLimit(fCacheSize);
+        SkTypeface* typeface = sk_tool_utils::create_portable_typeface(
+            "serif", SkTypeface::kItalic);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setSubpixelText(true);
+        paint.setTypeface(typeface);
+
+        for (int work = 0; work < loops; work++) {
+            do_font_stuff(&paint);
+        }
+        SkGraphics::SetFontCacheLimit(oldCacheLimitSize);
+    }
+
+private:
+    typedef Benchmark INHERITED;
+    const size_t fCacheSize;
+    SkString fName;
+};
+
+class SkGlyphCacheStressTest : public Benchmark {
+public:
+    explicit SkGlyphCacheStressTest(int cacheSize) : fCacheSize(cacheSize) { }
+
+protected:
+    const char* onGetName() override {
+        fName.printf("SkGlyphCacheStressTest%dK", (int)(fCacheSize >> 10));
+        return fName.c_str();
+    }
+
+    bool isSuitableFor(Backend backend) override {
+        return backend == kNonRendering_Backend;
+    }
+
+    void onDraw(const int loops, SkCanvas*) override {
+        size_t oldCacheLimitSize = SkGraphics::GetFontCacheLimit();
+        SkGraphics::SetFontCacheLimit(fCacheSize);
+        SkTypeface* typefaces[] =
+            {sk_tool_utils::create_portable_typeface("serif", SkTypeface::kItalic),
+             sk_tool_utils::create_portable_typeface("sans-serif", SkTypeface::kItalic)};
+
+        for (int work = 0; work < loops; work++) {
+            sk_parallel_for(16, [&](int threadIndex) {
+                SkPaint paint;
+                paint.setAntiAlias(true);
+                paint.setSubpixelText(true);
+                paint.setTypeface(typefaces[threadIndex % 2]);
+                do_font_stuff(&paint);
+            });
+        }
+        SkGraphics::SetFontCacheLimit(oldCacheLimitSize);
+    }
+
+private:
+    typedef Benchmark INHERITED;
+    const size_t fCacheSize;
+    SkString fName;
+};
+
+DEF_BENCH( return new SkGlyphCacheBasic(256 * 1024); )
+DEF_BENCH( return new SkGlyphCacheBasic(32 * 1024 * 1024); )
+DEF_BENCH( return new SkGlyphCacheStressTest(256 * 1024); )
+DEF_BENCH( return new SkGlyphCacheStressTest(32 * 1024 * 1024); )