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      1 /*
      2  * Copyright 2012 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 "SkMagnifierImageFilter.h"
     10 #include "SkRandom.h"
     11 
     12 #define WIDTH 500
     13 #define HEIGHT 500
     14 
     15 namespace skiagm {
     16 
     17 class ImageMagnifierGM : public GM {
     18 public:
     19     ImageMagnifierGM() {
     20         this->setBGColor(0xFF000000);
     21     }
     22 
     23 protected:
     24     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     25         // Skip tiled drawing until https://code.google.com/p/skia/issues/detail?id=781 is fixed.
     26         return this->INHERITED::onGetFlags() | GM::kSkipTiled_Flag;
     27     }
     28 
     29     virtual SkString onShortName() SK_OVERRIDE {
     30         return SkString("imagemagnifier");
     31     }
     32 
     33     virtual SkISize onISize() SK_OVERRIDE {
     34         return make_isize(WIDTH, HEIGHT);
     35     }
     36 
     37     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     38         SkPaint paint;
     39         paint.setImageFilter(
     40             new SkMagnifierImageFilter(
     41                 SkRect::MakeXYWH(SkIntToScalar(100), SkIntToScalar(100),
     42                                  SkIntToScalar(WIDTH / 2),
     43                                  SkIntToScalar(HEIGHT / 2)),
     44                 100))->unref();
     45         canvas->saveLayer(NULL, &paint);
     46         paint.setAntiAlias(true);
     47         const char* str = "The quick brown fox jumped over the lazy dog.";
     48         SkRandom rand;
     49         for (int i = 0; i < 25; ++i) {
     50             int x = rand.nextULessThan(WIDTH);
     51             int y = rand.nextULessThan(HEIGHT);
     52             paint.setColor(rand.nextBits(24) | 0xFF000000);
     53             paint.setTextSize(rand.nextRangeScalar(0, 300));
     54             canvas->drawText(str, strlen(str), SkIntToScalar(x),
     55                              SkIntToScalar(y), paint);
     56         }
     57         canvas->restore();
     58     }
     59 
     60 private:
     61     typedef GM INHERITED;
     62 };
     63 
     64 //////////////////////////////////////////////////////////////////////////////
     65 
     66 static GM* MyFactory(void*) { return new ImageMagnifierGM; }
     67 static GMRegistry reg(MyFactory);
     68 
     69 }
     70