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 getBitmap()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: GiantBitmapGM(SkShader::TileMode mode,bool doFilter,bool doRotate)63 GiantBitmapGM(SkShader::TileMode mode, bool doFilter, bool doRotate) : fBM(nullptr) { 64 fMode = mode; 65 fDoFilter = doFilter; 66 fDoRotate = doRotate; 67 } 68 ~GiantBitmapGM()69 virtual ~GiantBitmapGM() { delete fBM; } 70 71 protected: 72 onShortName()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 onISize()93 SkISize onISize() override { return SkISize::Make(640, 480); } 94 onDraw(SkCanvas * canvas)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 SkShader* s = SkShader::CreateBitmapShader(getBitmap(), fMode, fMode, &m); 108 109 paint.setShader(s)->unref(); 110 paint.setFilterQuality(fDoFilter ? kLow_SkFilterQuality : kNone_SkFilterQuality); 111 112 canvas->translate(SkIntToScalar(50), SkIntToScalar(50)); 113 114 // SkRect r = SkRect::MakeXYWH(-50, -50, 32, 16); 115 // canvas->drawRect(r, paint); return; 116 canvas->drawPaint(paint); 117 } 118 119 private: 120 typedef GM INHERITED; 121 }; 122 123 /////////////////////////////////////////////////////////////////////////////// 124 125 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, false, false); ) 126 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, false); ) 127 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, false, false); ) 128 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, true, false); ) 129 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, false); ) 130 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, true, false); ) 131 132 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, false, true); ) 133 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, true); ) 134 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, false, true); ) 135 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, true, true); ) 136 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, true); ) 137 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, true, true); ) 138