/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "bench/Benchmark.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkPaint.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/effects/SkImageFilters.h"
#include "src/base/SkRandom.h"

#include "tools/ToolUtils.h"

class MatrixConvolutionBench : public Benchmark {
public:
    MatrixConvolutionBench(bool bigKernel, SkTileMode tileMode, bool convolveAlpha)
        : fName(SkStringPrintf("matrixconvolution_%s%s%s",
                               bigKernel ? "bigKernel_" : "",
                               ToolUtils::tilemode_name(tileMode),
                               convolveAlpha ? "" : "_noConvolveAlpha")) {
        if (bigKernel) {
            SkISize kernelSize = SkISize::Make(9, 9);
            SkScalar kernel[81];
            for (int i = 0; i < 81; i++) {
                kernel[i] = SkIntToScalar(1);
            }
            kernel[40] = SkIntToScalar(-79);
            SkScalar gain = 0.3f, bias = SkIntToScalar(100);
            SkIPoint kernelOffset = SkIPoint::Make(4, 4);
            fFilter = SkImageFilters::MatrixConvolution(kernelSize, kernel, gain, bias,
                                                        kernelOffset, tileMode, convolveAlpha,
                                                        nullptr);
        } else {
            SkISize kernelSize = SkISize::Make(3, 3);
            SkScalar kernel[9] = {
                SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1),
                SkIntToScalar( 1), SkIntToScalar(-7), SkIntToScalar( 1),
                SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1),
            };
            SkScalar gain = 0.3f, bias = SkIntToScalar(100);
            SkIPoint kernelOffset = SkIPoint::Make(1, 1);
            fFilter = SkImageFilters::MatrixConvolution(kernelSize, kernel, gain, bias,
                                                        kernelOffset, tileMode, convolveAlpha,
                                                        nullptr);
        }
    }

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

    void onDraw(int loops, SkCanvas* canvas) override {
        SkPaint paint;
        this->setupPaint(&paint);
        paint.setImageFilter(fFilter);
        paint.setAntiAlias(true);

        SkRandom rand;
        for (int i = 0; i < loops; i++) {
            SkRect r = SkRect::MakeWH(rand.nextUScalar1() * 400,
                                      rand.nextUScalar1() * 400);
            canvas->drawOval(r, paint);
        }
    }

private:
    sk_sp<SkImageFilter> fFilter;
    SkString fName;

    using INHERITED = Benchmark;
};

DEF_BENCH( return new MatrixConvolutionBench(false, SkTileMode::kClamp, true); )
DEF_BENCH( return new MatrixConvolutionBench(false, SkTileMode::kRepeat, true); )
DEF_BENCH( return new MatrixConvolutionBench(false, SkTileMode::kMirror, true); )
DEF_BENCH( return new MatrixConvolutionBench(false, SkTileMode::kDecal, true); )
DEF_BENCH( return new MatrixConvolutionBench(false, SkTileMode::kDecal, false); )

DEF_BENCH( return new MatrixConvolutionBench(true, SkTileMode::kClamp, true); )
DEF_BENCH( return new MatrixConvolutionBench(true, SkTileMode::kRepeat, true); )
DEF_BENCH( return new MatrixConvolutionBench(true, SkTileMode::kMirror, true); )
DEF_BENCH( return new MatrixConvolutionBench(true, SkTileMode::kDecal, true); )
DEF_BENCH( return new MatrixConvolutionBench(true, SkTileMode::kDecal, false); )