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      1 /*
      2  * Copyright 2015 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 "SkImage.h"
     10 #include "SkImageSource.h"
     11 #include "SkSurface.h"
     12 
     13 namespace skiagm {
     14 
     15 // This GM reproduces the issue in crbug.com/472795. The SkImageSource image
     16 // is shifted for high quality mode between cpu and gpu.
     17 class ImageSourceGM : public GM {
     18 public:
     19     ImageSourceGM(const char* suffix, SkFilterQuality filter) : fSuffix(suffix), fFilter(filter) {
     20         this->setBGColor(0xFFFFFFFF);
     21     }
     22 
     23 protected:
     24     SkString onShortName() override {
     25         SkString name("imagesrc2_");
     26         name.append(fSuffix);
     27         return name;
     28     }
     29 
     30     SkISize onISize() override { return SkISize::Make(256, 256); }
     31 
     32     // Create an image with high frequency vertical stripes
     33     void onOnceBeforeDraw() override {
     34         constexpr SkPMColor gColors[] = {
     35             SK_ColorRED,     SK_ColorGRAY,
     36             SK_ColorGREEN,   SK_ColorGRAY,
     37             SK_ColorBLUE,    SK_ColorGRAY,
     38             SK_ColorCYAN,    SK_ColorGRAY,
     39             SK_ColorMAGENTA, SK_ColorGRAY,
     40             SK_ColorYELLOW,  SK_ColorGRAY,
     41             SK_ColorWHITE,   SK_ColorGRAY,
     42         };
     43 
     44         auto surface(SkSurface::MakeRasterN32Premul(kImageSize, kImageSize));
     45         SkCanvas* canvas = surface->getCanvas();
     46 
     47         int curColor = 0;
     48 
     49         for (int x = 0; x < kImageSize; x += 3) {
     50             SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(0),
     51                                         SkIntToScalar(3), SkIntToScalar(kImageSize));
     52             SkPaint p;
     53             p.setColor(gColors[curColor]);
     54             canvas->drawRect(r, p);
     55 
     56             curColor = (curColor+1) % SK_ARRAY_COUNT(gColors);
     57         }
     58 
     59         fImage = surface->makeImageSnapshot();
     60     }
     61 
     62     void onDraw(SkCanvas* canvas) override {
     63         const SkRect srcRect = SkRect::MakeLTRB(0, 0,
     64                                                 SkIntToScalar(kImageSize),
     65                                                 SkIntToScalar(kImageSize));
     66         const SkRect dstRect = SkRect::MakeLTRB(0.75f, 0.75f, 225.75f, 225.75f);
     67 
     68         SkPaint p;
     69         p.setImageFilter(SkImageSource::Make(fImage, srcRect, dstRect, fFilter));
     70 
     71         canvas->saveLayer(nullptr, &p);
     72         canvas->restore();
     73     }
     74 
     75 private:
     76     static constexpr int kImageSize = 503;
     77 
     78     SkString fSuffix;
     79     SkFilterQuality fFilter;
     80     sk_sp<SkImage>  fImage;
     81 
     82     typedef GM INHERITED;
     83 };
     84 
     85 //////////////////////////////////////////////////////////////////////////////
     86 
     87 DEF_GM(return new ImageSourceGM("none", kNone_SkFilterQuality);)
     88 DEF_GM(return new ImageSourceGM("low", kLow_SkFilterQuality);)
     89 DEF_GM(return new ImageSourceGM("med", kMedium_SkFilterQuality);)
     90 DEF_GM(return new ImageSourceGM("high", kHigh_SkFilterQuality);)
     91 }
     92