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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, 400);
     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 
     56         test(canvas,   0, 0, SkPerlinNoiseShader::kFractalNoise_Type,
     57              0.1f, 0.1f, 2, 0, false);
     58         test(canvas, 100, 0, SkPerlinNoiseShader::kFractalNoise_Type,
     59              0.2f, 0.4f, 5, 0, true);
     60 
     61         test(canvas,   0, 100, SkPerlinNoiseShader::kTurbulence_Type,
     62              0.1f, 0.1f, 2, 0, true);
     63         test(canvas, 100, 100, SkPerlinNoiseShader::kTurbulence_Type,
     64              0.2f, 0.4f, 5, 0, false);
     65 
     66         test(canvas,   0, 200, SkPerlinNoiseShader::kFractalNoise_Type,
     67              0.1f, 0.1f, 3, 1, false);
     68         test(canvas, 100, 200, SkPerlinNoiseShader::kFractalNoise_Type,
     69              0.1f, 0.1f, 3, 4, false);
     70 
     71         canvas->scale(SkFloatToScalar(0.75f), SkFloatToScalar(1.0f));
     72 
     73         test(canvas,   0, 300, SkPerlinNoiseShader::kFractalNoise_Type,
     74              0.1f, 0.1f, 2, 0, false);
     75         test(canvas, 100, 300, SkPerlinNoiseShader::kFractalNoise_Type,
     76              0.2f, 0.4f, 5, 0, true);
     77     }
     78 
     79 private:
     80     typedef GM INHERITED;
     81     SkISize fSize;
     82 };
     83 
     84 //////////////////////////////////////////////////////////////////////////////
     85 
     86 static GM* MyFactory(void*) { return new PerlinNoiseGM; }
     87 static GMRegistry reg(MyFactory);
     88 
     89 }
     90