gm/imagesource2.cpp

   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 }