gm/imageblur2.cpp

   1 /*
   2  * Copyright 2011 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 "SkBlurImageFilter.h"
  10 #include "SkRandom.h"
  11
  12 // TODO deprecate imageblur
  13
  14 #define WIDTH 500
  15 #define HEIGHT 500
  16
  17 static const float kBlurSigmas[] = {
  18         0.0, 0.3f, 0.5f, 2.0f, 32.0f, 80.0f };
  19
  20 const char* kTestStrings[] = {
  21         "The quick`~",
  22         "brown fox[]",
  23         "jumped over",
  24         "the lazy@#$",
  25         "dog.{}!%^&",
  26         "*()+=-\\'\"/",
  27 };
  28
  29 namespace skiagm {
  30
  31 class BlurImageFilter : public GM {
  32 public:
  33     BlurImageFilter() {
  34         this->setBGColor(0xFFFFFFFF);
  35         fName.printf("imageblur2");
  36     }
  37
  38 protected:
  39
  40     SkString onShortName() override {
  41         return fName;
  42     }
  43
  44     SkISize onISize() override {
  45         return SkISize::Make(WIDTH, HEIGHT);
  46     }
  47
  48     void onDraw(SkCanvas* canvas) override {
  49         const int sigmaCount = SK_ARRAY_COUNT(kBlurSigmas);
  50         const int testStringCount = SK_ARRAY_COUNT(kTestStrings);
  51         SkScalar dx = WIDTH / sigmaCount;
  52         SkScalar dy = HEIGHT / sigmaCount;
  53         const SkScalar textSize = 12;
  54
  55         for (int x = 0; x < sigmaCount; x++) {
  56             SkScalar sigmaX = kBlurSigmas[x];
  57             for (int y = 0; y < sigmaCount; y++) {
  58                 SkScalar sigmaY = kBlurSigmas[y];
  59
  60                 SkPaint paint;
  61                 paint.setImageFilter(SkBlurImageFilter::Create(sigmaX, sigmaY))->unref();
  62                 canvas->saveLayer(NULL, &paint);
  63
  64                 SkRandom rand;
  65                 SkPaint textPaint;
  66                 textPaint.setAntiAlias(false);
  67                 textPaint.setColor(rand.nextBits(24) | 0xFF000000);
  68                 textPaint.setTextSize(textSize);
  69
  70                 for (int i = 0; i < testStringCount; i++) {
  71                     canvas->drawText(kTestStrings[i],
  72                                      strlen(kTestStrings[i]),
  73                                      SkIntToScalar(x * dx),
  74                                      SkIntToScalar(y * dy + textSize * i + textSize),
  75                                      textPaint);
  76                 }
  77                 canvas->restore();
  78             }
  79         }
  80     }
  81
  82 private:
  83     SkString fName;
  84
  85     typedef GM INHERITED;
  86 };
  87
  88 //////////////////////////////////////////////////////////////////////////////
  89
  90 static GM* MyFactory(void*) { return new BlurImageFilter; }
  91 static GMRegistry reg(MyFactory);
  92
  93 }