gm/filterbug.cpp

   1 /*
   2  * Copyright 2016 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 "SkImageShader.h"
  10
  11 static const sk_sp<SkImage> make_image(int firstBlackRow, int lastBlackRow) {
  12     static const int kWidth = 25;
  13     static const int kHeight = 27;
  14
  15     SkBitmap bm;
  16     bm.allocN32Pixels(kWidth, kHeight);
  17     bm.eraseColor(SK_ColorWHITE);
  18     for (int y = firstBlackRow; y < lastBlackRow; ++y) {
  19         for (int x = 0; x < kWidth; ++x) {
  20             *bm.getAddr32(x, y) = SkPackARGB32(0xFF, 0x0, 0x0, 0x0);
  21         }
  22     }
  23
  24     bm.setAlphaType(SkAlphaType::kOpaque_SkAlphaType);
  25     bm.setImmutable();
  26
  27     return SkImage::MakeFromBitmap(bm);
  28 }
  29
  30 // GM to reproduce crbug.com/673261.
  31 class FilterBugGM : public skiagm::GM {
  32 public:
  33     FilterBugGM() { this->setBGColor(SK_ColorRED); }
  34
  35 protected:
  36     SkString onShortName() override { return SkString("filterbug"); }
  37
  38     SkISize onISize() override { return SkISize::Make(150, 150); }
  39
  40     void onOnceBeforeDraw() override {
  41         // The top texture has 5 black rows on top and then 22 white rows on the bottom
  42         fTop = make_image(0, 5);
  43         // The bottom texture has 5 black rows on the bottom and then 22 white rows on the top
  44         fBot = make_image(22, 27);
  45     }
  46
  47     void onDraw(SkCanvas* canvas) override {
  48         static const SkFilterQuality kFilterQuality = SkFilterQuality::kHigh_SkFilterQuality;
  49         static const bool kDoAA = true;
  50
  51         {
  52             SkRect r1 = SkRect::MakeXYWH(50.0f, 0.0f, 50.0f, 50.0f);
  53             SkPaint p1;
  54             p1.setAntiAlias(kDoAA);
  55             p1.setFilterQuality(kFilterQuality);
  56             SkMatrix localMat;
  57             localMat.setScaleTranslate(2.0f, 2.0f, 50.0f, 0.0f);
  58             p1.setShader(SkImageShader::Make(fTop,
  59                                              SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
  60                                              &localMat));
  61
  62             canvas->drawRect(r1, p1);
  63         }
  64
  65         {
  66             SkRect r2 = SkRect::MakeXYWH(50.0f, 50.0f, 50.0f, 36.0f);
  67
  68             SkPaint p2;
  69             p2.setColor(SK_ColorWHITE);
  70             p2.setAntiAlias(kDoAA);
  71             p2.setFilterQuality(kFilterQuality);
  72
  73             canvas->drawRect(r2, p2);
  74         }
  75
  76         {
  77             SkRect r3 = SkRect::MakeXYWH(50.0f, 86.0f, 50.0f, 50.0f);
  78
  79             SkPaint p3;
  80             p3.setAntiAlias(kDoAA);
  81             p3.setFilterQuality(kFilterQuality);
  82             SkMatrix localMat;
  83             localMat.setScaleTranslate(2.0f, 2.0f, 50.0f, 86.0f);
  84             p3.setShader(SkImageShader::Make(fBot,
  85                                              SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
  86                                              &localMat));
  87
  88             canvas->drawRect(r3, p3);
  89         }
  90     }
  91
  92 private:
  93     sk_sp<SkImage> fTop;
  94     sk_sp<SkImage> fBot;
  95
  96     typedef skiagm::GM INHERITED;
  97 };
  98
  99 //////////////////////////////////////////////////////////////////////////////
 100
 101 DEF_GM(return new FilterBugGM;)