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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 "SkColorPriv.h"
     10 #include "SkImageShader.h"
     11 
     12 static const sk_sp<SkImage> make_image(int firstBlackRow, int lastBlackRow) {
     13     static const int kWidth = 25;
     14     static const int kHeight = 27;
     15 
     16     SkBitmap bm;
     17     bm.allocN32Pixels(kWidth, kHeight);
     18     bm.eraseColor(SK_ColorWHITE);
     19     for (int y = firstBlackRow; y < lastBlackRow; ++y) {
     20         for (int x = 0; x < kWidth; ++x) {
     21             *bm.getAddr32(x, y) = SkPackARGB32(0xFF, 0x0, 0x0, 0x0);
     22         }
     23     }
     24 
     25     bm.setAlphaType(SkAlphaType::kOpaque_SkAlphaType);
     26     bm.setImmutable();
     27 
     28     return SkImage::MakeFromBitmap(bm);
     29 }
     30 
     31 // GM to reproduce crbug.com/673261.
     32 class FilterBugGM : public skiagm::GM {
     33 public:
     34     FilterBugGM() { this->setBGColor(SK_ColorRED); }
     35 
     36 protected:
     37     SkString onShortName() override { return SkString("filterbug"); }
     38 
     39     SkISize onISize() override { return SkISize::Make(150, 150); }
     40 
     41     void onOnceBeforeDraw() override {
     42         // The top texture has 5 black rows on top and then 22 white rows on the bottom
     43         fTop = make_image(0, 5);
     44         // The bottom texture has 5 black rows on the bottom and then 22 white rows on the top
     45         fBot = make_image(22, 27);
     46     }
     47 
     48     void onDraw(SkCanvas* canvas) override {
     49         static const SkFilterQuality kFilterQuality = SkFilterQuality::kHigh_SkFilterQuality;
     50         static const bool kDoAA = true;
     51 
     52         {
     53             SkRect r1 = SkRect::MakeXYWH(50.0f, 0.0f, 50.0f, 50.0f);
     54             SkPaint p1;
     55             p1.setAntiAlias(kDoAA);
     56             p1.setFilterQuality(kFilterQuality);
     57             SkMatrix localMat;
     58             localMat.setScaleTranslate(2.0f, 2.0f, 50.0f, 0.0f);
     59             p1.setShader(SkImageShader::Make(fTop,
     60                                              SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
     61                                              &localMat));
     62 
     63             canvas->drawRect(r1, p1);
     64         }
     65 
     66         {
     67             SkRect r2 = SkRect::MakeXYWH(50.0f, 50.0f, 50.0f, 36.0f);
     68 
     69             SkPaint p2;
     70             p2.setColor(SK_ColorWHITE);
     71             p2.setAntiAlias(kDoAA);
     72             p2.setFilterQuality(kFilterQuality);
     73 
     74             canvas->drawRect(r2, p2);
     75         }
     76 
     77         {
     78             SkRect r3 = SkRect::MakeXYWH(50.0f, 86.0f, 50.0f, 50.0f);
     79 
     80             SkPaint p3;
     81             p3.setAntiAlias(kDoAA);
     82             p3.setFilterQuality(kFilterQuality);
     83             SkMatrix localMat;
     84             localMat.setScaleTranslate(2.0f, 2.0f, 50.0f, 86.0f);
     85             p3.setShader(SkImageShader::Make(fBot,
     86                                              SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
     87                                              &localMat));
     88 
     89             canvas->drawRect(r3, p3);
     90         }
     91     }
     92 
     93 private:
     94     sk_sp<SkImage> fTop;
     95     sk_sp<SkImage> fBot;
     96 
     97     typedef skiagm::GM INHERITED;
     98 };
     99 
    100 //////////////////////////////////////////////////////////////////////////////
    101 
    102 DEF_GM(return new FilterBugGM;)
    103