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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "SkPerlinNoiseShader.h"
     10 
     11 namespace skiagm {
     12 
     13 class PerlinNoiseGM : public GM {
     14 public:
     15     PerlinNoiseGM() {
     16         this->setBGColor(0xFF000000);
     17         fSize = SkISize::Make(80, 80);
     18     }
     19 
     20 protected:
     21     virtual SkString onShortName() {
     22         return SkString("perlinnoise");
     23     }
     24 
     25     virtual SkISize onISize() {
     26         return make_isize(200, 500);
     27     }
     28 
     29     void drawClippedRect(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
     30         canvas->save();
     31         canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
     32                          SkIntToScalar(fSize.width()), SkIntToScalar(fSize.height())));
     33         SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
     34                                     SkIntToScalar(fSize.width()),
     35                                     SkIntToScalar(fSize.height()));
     36         canvas->drawRect(r, paint);
     37         canvas->restore();
     38     }
     39 
     40     void test(SkCanvas* canvas, int x, int y, SkPerlinNoiseShader::Type type,
     41               float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed,
     42               bool stitchTiles) {
     43         SkShader* shader = (type == SkPerlinNoiseShader::kFractalNoise_Type) ?
     44             SkPerlinNoiseShader::CreateFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves,
     45                                                    seed, stitchTiles ? &fSize : NULL) :
     46             SkPerlinNoiseShader::CreateTubulence(baseFrequencyX, baseFrequencyY, numOctaves,
     47                                                 seed, stitchTiles ? &fSize : NULL);
     48         SkPaint paint;
     49         paint.setShader(shader)->unref();
     50         drawClippedRect(canvas, x, y, paint);
     51     }
     52 
     53     virtual void onDraw(SkCanvas* canvas) {
     54         canvas->clear(0x00000000);
     55         test(canvas,   0,   0, SkPerlinNoiseShader::kFractalNoise_Type,
     56              0.1f, 0.1f, 0, 0, false);
     57         test(canvas, 100,   0, SkPerlinNoiseShader::kTurbulence_Type,
     58              0.1f, 0.1f, 0, 0, false);
     59 
     60         test(canvas,   0, 100, SkPerlinNoiseShader::kFractalNoise_Type,
     61              0.1f, 0.1f, 2, 0, false);
     62         test(canvas, 100, 100, SkPerlinNoiseShader::kFractalNoise_Type,
     63              0.2f, 0.4f, 5, 0, true);
     64 
     65         test(canvas,   0, 200, SkPerlinNoiseShader::kTurbulence_Type,
     66              0.1f, 0.1f, 2, 0, true);
     67         test(canvas, 100, 200, SkPerlinNoiseShader::kTurbulence_Type,
     68              0.2f, 0.4f, 5, 0, false);
     69 
     70         test(canvas,   0, 300, SkPerlinNoiseShader::kFractalNoise_Type,
     71              0.1f, 0.1f, 3, 1, false);
     72         test(canvas, 100, 300, SkPerlinNoiseShader::kFractalNoise_Type,
     73              0.1f, 0.1f, 3, 4, false);
     74 
     75         canvas->scale(0.75f, 1.0f);
     76 
     77         test(canvas,   0, 400, SkPerlinNoiseShader::kFractalNoise_Type,
     78              0.1f, 0.1f, 2, 0, false);
     79         test(canvas, 100, 400, SkPerlinNoiseShader::kFractalNoise_Type,
     80              0.2f, 0.4f, 5, 0, true);
     81     }
     82 
     83 private:
     84     typedef GM INHERITED;
     85     SkISize fSize;
     86 };
     87 
     88 //////////////////////////////////////////////////////////////////////////////
     89 
     90 static GM* MyFactory(void*) { return new PerlinNoiseGM; }
     91 static GMRegistry reg(MyFactory);
     92 
     93 }
     94