bench/PathUtilsBench.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 "SkCanvas.h"
#include "SkPathUtils.h"
#include "SkRandom.h"
#include "SkTime.h"
#include "SkString.h"

#define H 16
#define W 16
#define STRIDE 2

//this function is redefined for sample, test, and bench. is there anywhere
// I can put it to avoid code duplcation?           
static void fillRandomBits( int chars, char* bits ){
    SkTime time;
    SkMWCRandom rand = SkMWCRandom( time.GetMSecs() );

    for (int i = 0; i < chars; ++i){
        bits[i] = rand.nextU();
    }
}           

static void path_proc(char* bits, SkPath* path) {
    SkPathUtils::BitsToPath_Path(path, bits, H, W, STRIDE);
}

static void region_proc(char* bits, SkPath* path) {
    SkPathUtils::BitsToPath_Region(path, bits, H, W, STRIDE);
}

/// Emulates the mix of rects blitted by gmail during scrolling
class PathUtilsBench : public SkBenchmark {
    typedef void (*Proc)(char*, SkPath*);

    Proc fProc;
    int fH, fW, fStride;
    SkString fName;
    char* bits[H * STRIDE];
    
    enum { N = SkBENCHLOOP(20) };

public:
    PathUtilsBench(void* param, Proc proc, const char name[]) : INHERITED(param) {
        fProc = proc;
        fName.printf("pathUtils_%s", name);
        

    }

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

    virtual void onDraw(SkCanvas* canvas) {

        for (int i = 0; i < N; ++i){
            //create a random 16x16 bitmap
            fillRandomBits(H * STRIDE, (char*) &bits);
            
            //use passed function pointer to handle it
            SkPath path;
            fProc( (char*) &bits, &path);
        }
    }

private:
    typedef SkBenchmark INHERITED;
};

static SkBenchmark* PU_path(void* p) { return SkNEW_ARGS(PathUtilsBench, (p, path_proc, "path")); } 
static SkBenchmark* PU_region(void* p) { return SkNEW_ARGS(PathUtilsBench, (p, region_proc, "region")); } 

static BenchRegistry PU_Path(PU_path);
static BenchRegistry PU_Region(PU_region);