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      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;)
    102