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/gm.h" 9 #include "include/core/SkBitmap.h" 10 #include "include/core/SkCanvas.h" 11 #include "include/core/SkColor.h" 12 #include "include/core/SkMatrix.h" 13 #include "include/core/SkPaint.h" 14 #include "include/core/SkScalar.h" 15 #include "include/core/SkShader.h" 16 #include "include/core/SkSize.h" 17 #include "include/core/SkString.h" 18 #include "include/core/SkTileMode.h" 19 20 /* 21 * Want to ensure that our bitmap sampler (in bitmap shader) keeps plenty of 22 * precision when scaling very large images (where the dx might get very small. 23 */ 24 25 #define W 257 26 #define H 161 27 28 class GiantBitmapGM : public skiagm::GM { 29 SkBitmap* fBM; 30 SkTileMode fMode; 31 bool fDoFilter; 32 bool fDoRotate; 33 getBitmap()34 const SkBitmap& getBitmap() { 35 if (nullptr == fBM) { 36 fBM = new SkBitmap; 37 fBM->allocN32Pixels(W, H); 38 fBM->eraseColor(SK_ColorWHITE); 39 40 const SkColor colors[] = { 41 SK_ColorBLUE, SK_ColorRED, SK_ColorBLACK, SK_ColorGREEN 42 }; 43 44 SkCanvas canvas(*fBM); 45 SkPaint paint; 46 paint.setAntiAlias(true); 47 paint.setStrokeWidth(SkIntToScalar(20)); 48 49 #if 0 50 for (int y = -H*2; y < H; y += 50) { 51 SkScalar yy = SkIntToScalar(y); 52 paint.setColor(colors[y/50 & 0x3]); 53 canvas.drawLine(0, yy, SkIntToScalar(W), yy + SkIntToScalar(W), 54 paint); 55 } 56 #else 57 for (int x = -W; x < W; x += 60) { 58 paint.setColor(colors[x/60 & 0x3]); 59 60 SkScalar xx = SkIntToScalar(x); 61 canvas.drawLine(xx, 0, xx, SkIntToScalar(H), 62 paint); 63 } 64 #endif 65 } 66 return *fBM; 67 } 68 69 public: GiantBitmapGM(SkTileMode mode,bool doFilter,bool doRotate)70 GiantBitmapGM(SkTileMode mode, bool doFilter, bool doRotate) : fBM(nullptr) { 71 fMode = mode; 72 fDoFilter = doFilter; 73 fDoRotate = doRotate; 74 } 75 ~GiantBitmapGM()76 ~GiantBitmapGM() override { delete fBM; } 77 78 protected: getName() const79 SkString getName() const override { 80 SkString str("giantbitmap_"); 81 switch (fMode) { 82 case SkTileMode::kClamp: 83 str.append("clamp"); 84 break; 85 case SkTileMode::kRepeat: 86 str.append("repeat"); 87 break; 88 case SkTileMode::kMirror: 89 str.append("mirror"); 90 break; 91 case SkTileMode::kDecal: 92 str.append("decal"); 93 break; 94 default: 95 break; 96 } 97 str.append(fDoFilter ? "_bilerp" : "_point"); 98 str.append(fDoRotate ? "_rotate" : "_scale"); 99 return str; 100 } 101 getISize()102 SkISize getISize() override { return SkISize::Make(640, 480); } 103 onDraw(SkCanvas * canvas)104 void onDraw(SkCanvas* canvas) override { 105 SkPaint paint; 106 107 SkMatrix m; 108 if (fDoRotate) { 109 m.setSkew(SK_Scalar1, 0, 0, 0); 110 } else { 111 SkScalar scale = 11*SK_Scalar1/12; 112 m.setScale(scale, scale); 113 } 114 paint.setShader(getBitmap().makeShader( 115 fMode, fMode, 116 SkSamplingOptions(fDoFilter ? SkFilterMode::kLinear 117 : SkFilterMode::kNearest), 118 m)); 119 120 canvas->translate(50, 50); 121 122 canvas->drawPaint(paint); 123 } 124 125 private: 126 using INHERITED = GM; 127 }; 128 129 /////////////////////////////////////////////////////////////////////////////// 130 131 DEF_GM( return new GiantBitmapGM(SkTileMode::kClamp, false, false); ) 132 DEF_GM( return new GiantBitmapGM(SkTileMode::kRepeat, false, false); ) 133 DEF_GM( return new GiantBitmapGM(SkTileMode::kMirror, false, false); ) 134 DEF_GM( return new GiantBitmapGM(SkTileMode::kClamp, true, false); ) 135 DEF_GM( return new GiantBitmapGM(SkTileMode::kRepeat, true, false); ) 136 DEF_GM( return new GiantBitmapGM(SkTileMode::kMirror, true, false); ) 137 138 DEF_GM( return new GiantBitmapGM(SkTileMode::kClamp, false, true); ) 139 DEF_GM( return new GiantBitmapGM(SkTileMode::kRepeat, false, true); ) 140 DEF_GM( return new GiantBitmapGM(SkTileMode::kMirror, false, true); ) 141 DEF_GM( return new GiantBitmapGM(SkTileMode::kClamp, true, true); ) 142 DEF_GM( return new GiantBitmapGM(SkTileMode::kRepeat, true, true); ) 143 DEF_GM( return new GiantBitmapGM(SkTileMode::kMirror, true, true); ) 144