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/*
* 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 "gm.h"
#include "SkColor.h"
#include "SkMatrixConvolutionImageFilter.h"
#include "SkGradientShader.h"
namespace skiagm {
class MatrixConvolutionGM : public GM {
public:
MatrixConvolutionGM() {
this->setBGColor(0x00000000);
}
protected:
SkString onShortName() override {
return SkString("matrixconvolution");
}
void makeBitmap() {
fBitmap.allocN32Pixels(80, 80);
SkCanvas canvas(fBitmap);
canvas.clear(0x00000000);
SkPaint paint;
paint.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&paint);
paint.setColor(0xFFFFFFFF);
paint.setTextSize(SkIntToScalar(180));
SkPoint pts[2] = { SkPoint::Make(0, 0),
SkPoint::Make(0, SkIntToScalar(80)) };
SkColor colors[2] = { 0xFFFFFFFF, 0x40404040 };
SkScalar pos[2] = { 0, SkIntToScalar(80) };
paint.setShader(SkGradientShader::MakeLinear(
pts, colors, pos, 2, SkShader::kClamp_TileMode));
const char* str = "e";
canvas.drawText(str, strlen(str), SkIntToScalar(-10), SkIntToScalar(80), paint);
}
SkISize onISize() override {
return SkISize::Make(500, 300);
}
void draw(SkCanvas* canvas, int x, int y, const SkIPoint& kernelOffset,
SkMatrixConvolutionImageFilter::TileMode tileMode, bool convolveAlpha,
const SkImageFilter::CropRect* cropRect = nullptr) {
SkScalar kernel[9] = {
SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1),
SkIntToScalar( 1), SkIntToScalar(-7), SkIntToScalar( 1),
SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1),
};
SkISize kernelSize = SkISize::Make(3, 3);
SkScalar gain = 0.3f, bias = SkIntToScalar(100);
SkPaint paint;
paint.setImageFilter(SkMatrixConvolutionImageFilter::Make(kernelSize,
kernel,
gain,
bias,
kernelOffset,
tileMode,
convolveAlpha,
nullptr,
cropRect));
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
canvas->clipRect(SkRect::MakeWH(SkIntToScalar(fBitmap.width()),
SkIntToScalar(fBitmap.height())));
canvas->drawBitmap(fBitmap, 0, 0, &paint);
canvas->restore();
}
typedef SkMatrixConvolutionImageFilter MCIF;
void onOnceBeforeDraw() override {
this->makeBitmap();
}
void onDraw(SkCanvas* canvas) override {
canvas->clear(SK_ColorBLACK);
SkIPoint kernelOffset = SkIPoint::Make(1, 0);
SkImageFilter::CropRect rect(SkRect::Make(fBitmap.bounds()));
for (int x = 10; x < 310; x += 100) {
this->draw(canvas, x, 10, kernelOffset, MCIF::kClamp_TileMode, true, &rect);
this->draw(canvas, x, 110, kernelOffset, MCIF::kClampToBlack_TileMode, true, &rect);
this->draw(canvas, x, 210, kernelOffset, MCIF::kRepeat_TileMode, true, &rect);
kernelOffset.fY++;
}
kernelOffset.fY = 1;
SkImageFilter::CropRect smallRect(SkRect::MakeXYWH(10, 5, 60, 60));
this->draw(canvas, 310, 10, kernelOffset, MCIF::kClamp_TileMode, true, &smallRect);
this->draw(canvas, 310, 110, kernelOffset, MCIF::kClampToBlack_TileMode, true, &smallRect);
this->draw(canvas, 310, 210, kernelOffset, MCIF::kRepeat_TileMode, true, &smallRect);
this->draw(canvas, 410, 10, kernelOffset, MCIF::kClamp_TileMode, false, &rect);
this->draw(canvas, 410, 110, kernelOffset, MCIF::kClampToBlack_TileMode, false, &rect);
this->draw(canvas, 410, 210, kernelOffset, MCIF::kRepeat_TileMode, false, &rect);
}
private:
SkBitmap fBitmap;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new MatrixConvolutionGM;)
}
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