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/*
* Copyright 2013 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 "SkPerlinNoiseShader.h"
namespace skiagm {
class PerlinNoiseGM : public GM {
public:
PerlinNoiseGM() {
this->setBGColor(0xFF000000);
fSize = SkISize::Make(80, 80);
}
protected:
virtual SkString onShortName() {
return SkString("perlinnoise");
}
virtual SkISize onISize() {
return make_isize(200, 500);
}
void drawClippedRect(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
canvas->save();
canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
SkIntToScalar(fSize.width()), SkIntToScalar(fSize.height())));
SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
SkIntToScalar(fSize.width()),
SkIntToScalar(fSize.height()));
canvas->drawRect(r, paint);
canvas->restore();
}
void test(SkCanvas* canvas, int x, int y, SkPerlinNoiseShader::Type type,
float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed,
bool stitchTiles) {
SkShader* shader = (type == SkPerlinNoiseShader::kFractalNoise_Type) ?
SkPerlinNoiseShader::CreateFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves,
seed, stitchTiles ? &fSize : NULL) :
SkPerlinNoiseShader::CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves,
seed, stitchTiles ? &fSize : NULL);
SkPaint paint;
paint.setShader(shader)->unref();
drawClippedRect(canvas, x, y, paint);
}
virtual void onDraw(SkCanvas* canvas) {
canvas->clear(0x00000000);
test(canvas, 0, 0, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 0, 0, false);
test(canvas, 100, 0, SkPerlinNoiseShader::kTurbulence_Type,
0.1f, 0.1f, 0, 0, false);
test(canvas, 0, 100, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 2, 0, false);
test(canvas, 100, 100, SkPerlinNoiseShader::kFractalNoise_Type,
0.2f, 0.4f, 5, 0, true);
test(canvas, 0, 200, SkPerlinNoiseShader::kTurbulence_Type,
0.1f, 0.1f, 2, 0, true);
test(canvas, 100, 200, SkPerlinNoiseShader::kTurbulence_Type,
0.2f, 0.4f, 5, 0, false);
test(canvas, 0, 300, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 3, 1, false);
test(canvas, 100, 300, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 3, 4, false);
canvas->scale(0.75f, 1.0f);
test(canvas, 0, 400, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 2, 0, false);
test(canvas, 100, 400, SkPerlinNoiseShader::kFractalNoise_Type,
0.2f, 0.4f, 5, 0, true);
}
private:
typedef GM INHERITED;
SkISize fSize;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new PerlinNoiseGM; }
static GMRegistry reg(MyFactory);
}
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