bench/PathIterBench.cpp

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SkBenchmark.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkPaint.h"
#include "SkRandom.h"
#include "SkShader.h"
#include "SkString.h"

static int rand_pts(SkRandom& rand, SkPoint pts[4]) {
    int n = rand.nextU() & 3;
    n += 1;

    for (int i = 0; i < n; ++i) {
        pts[i].fX = rand.nextSScalar1();
        pts[i].fY = rand.nextSScalar1();
    }
    return n;
}

class PathIterBench : public SkBenchmark {
    SkString    fName;
    SkPath      fPath;
    bool        fRaw;

public:
    PathIterBench(bool raw)  {
        fName.printf("pathiter_%s", raw ? "raw" : "consume");
        fRaw = raw;

        SkRandom rand;
        for (int i = 0; i < 1000; ++i) {
            SkPoint pts[4];
            int n = rand_pts(rand, pts);
            switch (n) {
                case 1:
                    fPath.moveTo(pts[0]);
                    break;
                case 2:
                    fPath.lineTo(pts[1]);
                    break;
                case 3:
                    fPath.quadTo(pts[1], pts[2]);
                    break;
                case 4:
                    fPath.cubicTo(pts[1], pts[2], pts[3]);
                    break;
            }
        }
    }

    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
        return backend == kNonRendering_Backend;
    }

protected:
    virtual const char* onGetName() SK_OVERRIDE {
        return fName.c_str();
    }

    virtual void onDraw(SkCanvas*) SK_OVERRIDE {
        if (fRaw) {
            for (int i = 0; i < this->getLoops(); ++i) {
                SkPath::RawIter iter(fPath);
                SkPath::Verb verb;
                SkPoint      pts[4];

                while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { }
            }
        } else {
            for (int i = 0; i < this->getLoops(); ++i) {
                SkPath::Iter iter(fPath, false);
                SkPath::Verb verb;
                SkPoint      pts[4];

                while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { }
            }
        }
    }

private:
    typedef SkBenchmark INHERITED;
};

///////////////////////////////////////////////////////////////////////////////

DEF_BENCH( return new PathIterBench(false); )
DEF_BENCH( return new PathIterBench(true); )