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 "Sample.h" 9 #include "SkCanvas.h" 10 #include "SkBlurMaskFilter.h" 11 #include "SkCamera.h" 12 #include "SkColorFilter.h" 13 #include "SkColorPriv.h" 14 #include "SkGradientShader.h" 15 #include "SkImage.h" 16 #include "SkInterpolator.h" 17 #include "SkMaskFilter.h" 18 #include "SkPath.h" 19 #include "SkRegion.h" 20 #include "SkShader.h" 21 #include "SkTime.h" 22 #include "SkTypeface.h" 23 #include "SkUTF.h" 24 #include "SkClipOpPriv.h" 25 26 static void make_paint(SkPaint* paint, const SkMatrix& localMatrix) { 27 SkColor colors[] = { 0, SK_ColorWHITE }; 28 SkPoint pts[] = { { 0, 0 }, { 0, SK_Scalar1*20 } }; 29 paint->setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, 30 SkShader::kClamp_TileMode, 0, &localMatrix)); 31 paint->setBlendMode(SkBlendMode::kDstIn); 32 } 33 34 // test drawing with strips of fading gradient above and below 35 static void test_fade(SkCanvas* canvas) { 36 SkAutoCanvasRestore ar(canvas, true); 37 38 SkRect r; 39 40 SkPaint p; 41 p.setAlpha(0x88); 42 43 SkAutoCanvasRestore ar2(canvas, false); 44 45 // create the layers 46 47 r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100)); 48 canvas->clipRect(r); 49 50 r.fBottom = SkIntToScalar(20); 51 canvas->saveLayer(&r, nullptr); 52 53 r.fTop = SkIntToScalar(80); 54 r.fBottom = SkIntToScalar(100); 55 canvas->saveLayer(&r, nullptr); 56 57 // now draw the "content" 58 59 if (true) { 60 r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100)); 61 62 canvas->saveLayerAlpha(&r, 0x80); 63 64 SkPaint p; 65 p.setColor(SK_ColorRED); 66 p.setAntiAlias(true); 67 canvas->drawOval(r, p); 68 69 canvas->restore(); 70 } else { 71 r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100)); 72 73 SkPaint p; 74 p.setColor(SK_ColorRED); 75 p.setAntiAlias(true); 76 canvas->drawOval(r, p); 77 } 78 79 // return; 80 81 // now apply an effect 82 SkMatrix m; 83 m.setScale(SK_Scalar1, -SK_Scalar1); 84 m.postTranslate(0, SkIntToScalar(100)); 85 86 SkPaint paint; 87 make_paint(&paint, m); 88 r.set(0, 0, SkIntToScalar(100), SkIntToScalar(20)); 89 // SkDebugf("--------- draw top grad\n"); 90 canvas->drawRect(r, paint); 91 92 r.fTop = SkIntToScalar(80); 93 r.fBottom = SkIntToScalar(100); 94 // SkDebugf("--------- draw bot grad\n"); 95 canvas->drawRect(r, paint); 96 } 97 98 class LayersView : public Sample { 99 public: 100 LayersView() {} 101 102 protected: 103 bool onQuery(Sample::Event* evt) override { 104 if (Sample::TitleQ(*evt)) { 105 Sample::TitleR(evt, "Layers"); 106 return true; 107 } 108 return this->INHERITED::onQuery(evt); 109 } 110 111 void drawBG(SkCanvas* canvas) { 112 canvas->drawColor(SK_ColorGRAY); 113 } 114 115 void onDrawContent(SkCanvas* canvas) override { 116 this->drawBG(canvas); 117 118 if (true) { 119 SkRect r; 120 r.set(SkIntToScalar(0), SkIntToScalar(0), 121 SkIntToScalar(220), SkIntToScalar(120)); 122 SkPaint p; 123 canvas->saveLayer(&r, &p); 124 canvas->drawColor(0xFFFF0000); 125 p.setAlpha(0); // or 0 126 p.setBlendMode(SkBlendMode::kSrc); 127 canvas->drawOval(r, p); 128 canvas->restore(); 129 return; 130 } 131 132 if (false) { 133 SkRect r; 134 r.set(SkIntToScalar(0), SkIntToScalar(0), 135 SkIntToScalar(220), SkIntToScalar(120)); 136 SkPaint p; 137 p.setAlpha(0x88); 138 p.setAntiAlias(true); 139 140 if (true) { 141 canvas->saveLayer(&r, &p); 142 p.setColor(0xFFFF0000); 143 canvas->drawOval(r, p); 144 canvas->restore(); 145 } 146 147 p.setColor(0xFF0000FF); 148 r.offset(SkIntToScalar(20), SkIntToScalar(50)); 149 canvas->drawOval(r, p); 150 } 151 152 if (false) { 153 SkPaint p; 154 p.setAlpha(0x88); 155 p.setAntiAlias(true); 156 157 canvas->translate(SkIntToScalar(300), 0); 158 159 SkRect r; 160 r.set(SkIntToScalar(0), SkIntToScalar(0), 161 SkIntToScalar(220), SkIntToScalar(60)); 162 163 canvas->saveLayer(&r, &p); 164 165 r.set(SkIntToScalar(0), SkIntToScalar(0), 166 SkIntToScalar(220), SkIntToScalar(120)); 167 p.setColor(SK_ColorBLUE); 168 canvas->drawOval(r, p); 169 canvas->restore(); 170 return; 171 } 172 173 test_fade(canvas); 174 } 175 176 private: 177 typedef Sample INHERITED; 178 }; 179 DEF_SAMPLE( return new LayersView; ) 180 181 ////////////////////////////////////////////////////////////////////////////// 182 183 #include "SkBlurImageFilter.h" 184 #include "SkMatrixConvolutionImageFilter.h" 185 #include "SkMorphologyImageFilter.h" 186 187 #include "Resources.h" 188 #include "SkAnimTimer.h" 189 190 class BackdropView : public Sample { 191 SkPoint fCenter; 192 SkScalar fAngle; 193 sk_sp<SkImage> fImage; 194 sk_sp<SkImageFilter> fFilter; 195 public: 196 BackdropView() { 197 fCenter.set(200, 150); 198 fAngle = 0; 199 fImage = GetResourceAsImage("images/mandrill_512.png"); 200 fFilter = SkDilateImageFilter::Make(8, 8, nullptr); 201 } 202 203 protected: 204 bool onQuery(Sample::Event* evt) override { 205 if (Sample::TitleQ(*evt)) { 206 Sample::TitleR(evt, "Backdrop"); 207 return true; 208 } 209 return this->INHERITED::onQuery(evt); 210 } 211 212 void onDrawContent(SkCanvas* canvas) override { 213 canvas->drawImage(fImage.get(), 0, 0, nullptr); 214 215 const SkScalar w = 250; 216 const SkScalar h = 150; 217 SkPath path; 218 path.addOval(SkRect::MakeXYWH(-w/2, -h/2, w, h)); 219 SkMatrix m; 220 m.setRotate(fAngle); 221 m.postTranslate(fCenter.x(), fCenter.y()); 222 path.transform(m); 223 224 canvas->clipPath(path, kIntersect_SkClipOp, true); 225 const SkRect bounds = path.getBounds(); 226 227 SkPaint paint; 228 paint.setAlpha(0xCC); 229 canvas->saveLayer({ &bounds, &paint, fFilter.get(), nullptr, nullptr, 0 }); 230 231 canvas->restore(); 232 } 233 234 bool onAnimate(const SkAnimTimer& timer) override { 235 fAngle = SkDoubleToScalar(fmod(timer.secs() * 360 / 5, 360)); 236 return true; 237 } 238 239 Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override { 240 return new Click(this); 241 } 242 243 bool onClick(Click* click) override { 244 fCenter = click->fCurr; 245 return this->INHERITED::onClick(click); 246 } 247 248 private: 249 typedef Sample INHERITED; 250 }; 251 DEF_SAMPLE( return new BackdropView; ) 252
