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      1 /*
      2  * Copyright 2017 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "Benchmark.h"
      9 #include "SkCanvas.h"
     10 #include "SkGlyphCache.h"
     11 #include "SkPaint.h"
     12 #include "SkPath.h"
     13 #include "SkRandom.h"
     14 #include "sk_tool_utils.h"
     15 
     16 static constexpr int kScreenWidth = 1500;
     17 static constexpr int kScreenHeight = 1500;
     18 
     19 static constexpr int kNumDraws = 2000;
     20 
     21 // I and l are rects on OS X.
     22 static constexpr char kGlyphs[] =  "ABCDEFGH7JKLMNOPQRSTUVWXYZabcdefghijk1mnopqrstuvwxyz";
     23 static constexpr int kNumGlyphs = sizeof(kGlyphs) - 1;
     24 static_assert(52 == kNumGlyphs, "expected 52 glyphs");
     25 
     26 /*
     27  * This class benchmarks drawing many glyphs at random scales and rotations.
     28  */
     29 class PathTextBench : public Benchmark {
     30 public:
     31     PathTextBench(bool clipped, bool uncached) : fClipped(clipped), fUncached(uncached) {}
     32     bool isVisual() override { return true; }
     33 
     34 private:
     35     const char* onGetName() override {
     36         fName = "path_text";
     37         if (fClipped) {
     38             fName.append("_clipped");
     39         }
     40         if (fUncached) {
     41             fName.append("_uncached");
     42         }
     43         return fName.c_str();
     44     }
     45     SkIPoint onGetSize() override { return SkIPoint::Make(kScreenWidth, kScreenHeight); }
     46 
     47     void onDelayedSetup() override {
     48         SkPaint defaultPaint;
     49         SkAutoGlyphCache agc(defaultPaint, nullptr, &SkMatrix::I());
     50         SkGlyphCache* cache = agc.getCache();
     51         for (int i = 0; i < kNumGlyphs; ++i) {
     52             SkGlyphID id = cache->unicharToGlyph(kGlyphs[i]);
     53             cache->getScalerContext()->getPath(SkPackedGlyphID(id), &fGlyphs[i]);
     54             fGlyphs[i].setIsVolatile(fUncached);
     55         }
     56 
     57         SkRandom rand;
     58         for (int i = 0; i < kNumDraws; ++i) {
     59             const SkPath& glyph = fGlyphs[i % kNumGlyphs];
     60             const SkRect& bounds = glyph.getBounds();
     61             float glyphSize = SkTMax(bounds.width(), bounds.height());
     62 
     63             float t0 = pow(rand.nextF(), 100);
     64             float size = (1 - t0) * SkTMin(kScreenWidth, kScreenHeight) / 50 +
     65                          t0 * SkTMin(kScreenWidth, kScreenHeight) / 3;
     66             float scale = size / glyphSize;
     67             float t1 = rand.nextF(), t2 = rand.nextF();
     68             fXforms[i].setTranslate((1 - t1) * sqrt(2) * scale/2 * glyphSize +
     69                                      t1 * (kScreenWidth - sqrt(2) * scale/2 * glyphSize),
     70                                      (1 - t2) * sqrt(2) * scale/2 * glyphSize +
     71                                      t2 * (kScreenHeight - sqrt(2) * scale/2 * glyphSize));
     72             fXforms[i].preRotate(rand.nextF() * 360);
     73             fXforms[i].preTranslate(-scale/2 * bounds.width(), -scale/2 * bounds.height());
     74             fXforms[i].preScale(scale, scale);
     75             fPaints[i].setAntiAlias(true);
     76             fPaints[i].setColor(rand.nextU() | 0x80808080);
     77         }
     78 
     79         if (fClipped) {
     80             fClipPath = sk_tool_utils::make_star(SkRect::MakeIWH(kScreenWidth,kScreenHeight), 11,3);
     81             fClipPath.setIsVolatile(fUncached);
     82         }
     83     }
     84 
     85     void onDraw(int loops, SkCanvas* canvas) override {
     86         SkAutoCanvasRestore acr(canvas, true);
     87         if (fClipped) {
     88             canvas->clipPath(fClipPath, SkClipOp::kIntersect, true);
     89         }
     90         for (int i = 0; i < kNumDraws; ++i) {
     91             const SkPath& glyph = fGlyphs[i % kNumGlyphs];
     92             canvas->setMatrix(fXforms[i]);
     93             canvas->drawPath(glyph, fPaints[i]);
     94         }
     95     }
     96 
     97     const bool fClipped;
     98     const bool fUncached;
     99     SkString fName;
    100     SkPath fGlyphs[kNumGlyphs];
    101     SkPaint fPaints[kNumDraws];
    102     SkMatrix fXforms[kNumDraws];
    103     SkPath fClipPath;
    104 
    105     typedef Benchmark INHERITED;
    106 };
    107 
    108 DEF_BENCH(return new PathTextBench(false, false);)
    109 DEF_BENCH(return new PathTextBench(false, true);)
    110 DEF_BENCH(return new PathTextBench(true, true);)
    111