gm/giantbitmap.cpp

   1 /*
   2  * Copyright 2011 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 "SkCanvas.h"
  10 #include "SkColorPriv.h"
  11 #include "SkShader.h"
  12
  13 /*
  14  *  Want to ensure that our bitmap sampler (in bitmap shader) keeps plenty of
  15  *  precision when scaling very large images (where the dx might get very small.
  16  */
  17
  18 #define W   257
  19 #define H   161
  20
  21 class GiantBitmapGM : public skiagm::GM {
  22     SkBitmap* fBM;
  23     SkShader::TileMode fMode;
  24     bool fDoFilter;
  25     bool fDoRotate;
  26
  27     const SkBitmap& getBitmap() {
  28         if (nullptr == fBM) {
  29             fBM = new SkBitmap;
  30             fBM->allocN32Pixels(W, H);
  31             fBM->eraseColor(SK_ColorWHITE);
  32
  33             const SkColor colors[] = {
  34                 SK_ColorBLUE, SK_ColorRED, SK_ColorBLACK, SK_ColorGREEN
  35             };
  36
  37             SkCanvas canvas(*fBM);
  38             SkPaint paint;
  39             paint.setAntiAlias(true);
  40             paint.setStrokeWidth(SkIntToScalar(20));
  41
  42 #if 0
  43             for (int y = -H*2; y < H; y += 50) {
  44                 SkScalar yy = SkIntToScalar(y);
  45                 paint.setColor(colors[y/50 & 0x3]);
  46                 canvas.drawLine(0, yy, SkIntToScalar(W), yy + SkIntToScalar(W),
  47                                 paint);
  48             }
  49 #else
  50             for (int x = -W; x < W; x += 60) {
  51                 paint.setColor(colors[x/60 & 0x3]);
  52
  53                 SkScalar xx = SkIntToScalar(x);
  54                 canvas.drawLine(xx, 0, xx, SkIntToScalar(H),
  55                                 paint);
  56             }
  57 #endif
  58         }
  59         return *fBM;
  60     }
  61
  62 public:
  63     GiantBitmapGM(SkShader::TileMode mode, bool doFilter, bool doRotate) : fBM(nullptr) {
  64         fMode = mode;
  65         fDoFilter = doFilter;
  66         fDoRotate = doRotate;
  67     }
  68
  69     ~GiantBitmapGM() override { delete fBM; }
  70
  71 protected:
  72
  73     SkString onShortName() override {
  74         SkString str("giantbitmap_");
  75         switch (fMode) {
  76             case SkShader::kClamp_TileMode:
  77                 str.append("clamp");
  78                 break;
  79             case SkShader::kRepeat_TileMode:
  80                 str.append("repeat");
  81                 break;
  82             case SkShader::kMirror_TileMode:
  83                 str.append("mirror");
  84                 break;
  85             default:
  86                 break;
  87         }
  88         str.append(fDoFilter ? "_bilerp" : "_point");
  89         str.append(fDoRotate ? "_rotate" : "_scale");
  90         return str;
  91     }
  92
  93     SkISize onISize() override { return SkISize::Make(640, 480); }
  94
  95     void onDraw(SkCanvas* canvas) override {
  96         SkPaint paint;
  97
  98         SkMatrix m;
  99         if (fDoRotate) {
 100 //            m.setRotate(SkIntToScalar(30), 0, 0);
 101             m.setSkew(SK_Scalar1, 0, 0, 0);
 102 //            m.postScale(2*SK_Scalar1/3, 2*SK_Scalar1/3);
 103         } else {
 104             SkScalar scale = 11*SK_Scalar1/12;
 105             m.setScale(scale, scale);
 106         }
 107         paint.setShader(SkShader::MakeBitmapShader(getBitmap(), fMode, fMode, &m));
 108         paint.setFilterQuality(fDoFilter ? kLow_SkFilterQuality : kNone_SkFilterQuality);
 109
 110         canvas->translate(SkIntToScalar(50), SkIntToScalar(50));
 111
 112 //        SkRect r = SkRect::MakeXYWH(-50, -50, 32, 16);
 113 //        canvas->drawRect(r, paint); return;
 114         canvas->drawPaint(paint);
 115     }
 116
 117 private:
 118     typedef GM INHERITED;
 119 };
 120
 121 ///////////////////////////////////////////////////////////////////////////////
 122
 123 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, false, false); )
 124 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, false); )
 125 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, false, false); )
 126 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, true, false); )
 127 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, false); )
 128 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, true, false); )
 129
 130 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, false, true); )
 131 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, true); )
 132 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, false, true); )
 133 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, true, true); )
 134 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, true); )
 135 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, true, true); )