1 /* 2 * Copyright 2014 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 "SkGradientShader.h" 10 11 namespace skiagm { 12 13 struct GradData { 14 int fCount; 15 const SkColor* fColors; 16 const SkScalar* fPos; 17 }; 18 19 static const SkColor gColors[] = { 20 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK 21 }; 22 static const SkScalar gPos0[] = { 0, SK_Scalar1 }; 23 static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 }; 24 static const SkScalar gPos2[] = { 25 0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1 26 }; 27 28 static const SkScalar gPosClamp[] = {0.0f, 0.0f, 1.0f, 1.0f}; 29 static const SkColor gColorClamp[] = { 30 SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLUE 31 }; 32 33 static const GradData gGradData[] = { 34 { 2, gColors, gPos0 }, 35 { 2, gColors, gPos1 }, 36 { 5, gColors, gPos2 }, 37 { 4, gColorClamp, gPosClamp } 38 }; 39 40 static SkShader* Make2ConicalOutside(const SkPoint pts[2], const GradData& data, 41 SkShader::TileMode tm, const SkMatrix& localMatrix) { 42 SkPoint center0, center1; 43 SkScalar radius0 = (pts[1].fX - pts[0].fX) / 10; 44 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 45 center0.set(pts[0].fX + radius0, pts[0].fY + radius0); 46 center1.set(pts[1].fX - radius1, pts[1].fY - radius1); 47 return SkGradientShader::CreateTwoPointConical(center0, radius0, 48 center1, radius1, 49 data.fColors, data.fPos, 50 data.fCount, tm, 0, &localMatrix); 51 } 52 53 static SkShader* Make2ConicalOutsideFlip(const SkPoint pts[2], const GradData& data, 54 SkShader::TileMode tm, const SkMatrix& localMatrix) { 55 SkPoint center0, center1; 56 SkScalar radius0 = (pts[1].fX - pts[0].fX) / 10; 57 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 58 center0.set(pts[0].fX + radius0, pts[0].fY + radius0); 59 center1.set(pts[1].fX - radius1, pts[1].fY - radius1); 60 return SkGradientShader::CreateTwoPointConical(center1, radius1, 61 center0, radius0, 62 data.fColors, data.fPos, 63 data.fCount, tm, 0, &localMatrix); 64 } 65 66 static SkShader* Make2ConicalInside(const SkPoint pts[2], const GradData& data, 67 SkShader::TileMode tm, const SkMatrix& localMatrix) { 68 SkPoint center0, center1; 69 center0.set(SkScalarAve(pts[0].fX, pts[1].fX), 70 SkScalarAve(pts[0].fY, pts[1].fY)); 71 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), 72 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); 73 return SkGradientShader::CreateTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7, 74 center0, (pts[1].fX - pts[0].fX) / 2, 75 data.fColors, data.fPos, data.fCount, tm, 76 0, &localMatrix); 77 } 78 79 static SkShader* Make2ConicalInsideFlip(const SkPoint pts[2], const GradData& data, 80 SkShader::TileMode tm, const SkMatrix& localMatrix) { 81 SkPoint center0, center1; 82 center0.set(SkScalarAve(pts[0].fX, pts[1].fX), 83 SkScalarAve(pts[0].fY, pts[1].fY)); 84 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), 85 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); 86 return SkGradientShader::CreateTwoPointConical(center0, (pts[1].fX - pts[0].fX) / 2, 87 center1, (pts[1].fX - pts[0].fX) / 7, 88 data.fColors, data.fPos, data.fCount, tm, 89 0, &localMatrix); 90 } 91 92 static SkShader* Make2ConicalInsideCenter(const SkPoint pts[2], const GradData& data, 93 SkShader::TileMode tm, const SkMatrix& localMatrix) { 94 SkPoint center0, center1; 95 center0.set(SkScalarAve(pts[0].fX, pts[1].fX), 96 SkScalarAve(pts[0].fY, pts[1].fY)); 97 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), 98 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); 99 return SkGradientShader::CreateTwoPointConical(center0, (pts[1].fX - pts[0].fX) / 7, 100 center0, (pts[1].fX - pts[0].fX) / 2, 101 data.fColors, data.fPos, data.fCount, tm, 102 0, &localMatrix); 103 } 104 105 static SkShader* Make2ConicalZeroRad(const SkPoint pts[2], const GradData& data, 106 SkShader::TileMode tm, const SkMatrix& localMatrix) { 107 SkPoint center0, center1; 108 center0.set(SkScalarAve(pts[0].fX, pts[1].fX), 109 SkScalarAve(pts[0].fY, pts[1].fY)); 110 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), 111 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); 112 return SkGradientShader::CreateTwoPointConical(center1, 0.f, 113 center0, (pts[1].fX - pts[0].fX) / 2, 114 data.fColors, data.fPos, data.fCount, tm, 115 0, &localMatrix); 116 } 117 118 static SkShader* Make2ConicalZeroRadFlip(const SkPoint pts[2], const GradData& data, 119 SkShader::TileMode tm, const SkMatrix& localMatrix) { 120 SkPoint center0, center1; 121 center0.set(SkScalarAve(pts[0].fX, pts[1].fX), 122 SkScalarAve(pts[0].fY, pts[1].fY)); 123 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), 124 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); 125 return SkGradientShader::CreateTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 2, 126 center0, 0.f, 127 data.fColors, data.fPos, data.fCount, tm, 128 0, &localMatrix); 129 } 130 131 static SkShader* Make2ConicalZeroRadCenter(const SkPoint pts[2], const GradData& data, 132 SkShader::TileMode tm, const SkMatrix& localMatrix) { 133 SkPoint center0, center1; 134 center0.set(SkScalarAve(pts[0].fX, pts[1].fX), 135 SkScalarAve(pts[0].fY, pts[1].fY)); 136 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), 137 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); 138 return SkGradientShader::CreateTwoPointConical(center0, 0.f, 139 center0, (pts[1].fX - pts[0].fX) / 2, 140 data.fColors, data.fPos, data.fCount, tm, 141 0, &localMatrix); 142 } 143 144 static SkShader* Make2ConicalZeroRadOutside(const SkPoint pts[2], const GradData& data, 145 SkShader::TileMode tm, const SkMatrix& localMatrix) { 146 SkPoint center0, center1; 147 SkScalar radius0 = 0.f; 148 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 149 center0.set(pts[0].fX + radius0, pts[0].fY + radius0); 150 center1.set(pts[1].fX - radius1, pts[1].fY - radius1); 151 return SkGradientShader::CreateTwoPointConical(center0, radius0, 152 center1, radius1, 153 data.fColors, data.fPos, 154 data.fCount, tm, 0, &localMatrix); 155 } 156 157 static SkShader* Make2ConicalZeroRadFlipOutside(const SkPoint pts[2], const GradData& data, 158 SkShader::TileMode tm, const SkMatrix& localMatrix) { 159 SkPoint center0, center1; 160 SkScalar radius0 = 0.f; 161 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 162 center0.set(pts[0].fX + radius0, pts[0].fY + radius0); 163 center1.set(pts[1].fX - radius1, pts[1].fY - radius1); 164 return SkGradientShader::CreateTwoPointConical(center1, radius1, 165 center0, radius0, 166 data.fColors, data.fPos, 167 data.fCount, tm, 0, &localMatrix); 168 } 169 170 static SkShader* Make2ConicalEdgeX(const SkPoint pts[2], const GradData& data, 171 SkShader::TileMode tm, const SkMatrix& localMatrix) { 172 SkPoint center0, center1; 173 SkScalar radius0 = (pts[1].fX - pts[0].fX) / 7; 174 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 175 center1.set(SkScalarAve(pts[0].fX, pts[1].fX), 176 SkScalarAve(pts[0].fY, pts[1].fY)); 177 center0.set(center1.fX + radius1, center1.fY); 178 return SkGradientShader::CreateTwoPointConical(center0, radius0, 179 center1, radius1, 180 data.fColors, data.fPos, 181 data.fCount, tm, 0, &localMatrix); 182 } 183 184 static SkShader* Make2ConicalEdgeY(const SkPoint pts[2], const GradData& data, 185 SkShader::TileMode tm, const SkMatrix& localMatrix) { 186 SkPoint center0, center1; 187 SkScalar radius0 = (pts[1].fX - pts[0].fX) / 7; 188 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 189 center1.set(SkScalarAve(pts[0].fX, pts[1].fX), 190 SkScalarAve(pts[0].fY, pts[1].fY)); 191 center0.set(center1.fX, center1.fY + radius1); 192 return SkGradientShader::CreateTwoPointConical(center0, radius0, 193 center1, radius1, 194 data.fColors, data.fPos, 195 data.fCount, tm, 0, &localMatrix); 196 } 197 198 static SkShader* Make2ConicalZeroRadEdgeX(const SkPoint pts[2], const GradData& data, 199 SkShader::TileMode tm, const SkMatrix& localMatrix) { 200 SkPoint center0, center1; 201 SkScalar radius0 = 0.f; 202 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 203 center1.set(SkScalarAve(pts[0].fX, pts[1].fX), 204 SkScalarAve(pts[0].fY, pts[1].fY)); 205 center0.set(center1.fX + radius1, center1.fY); 206 return SkGradientShader::CreateTwoPointConical(center0, radius0, 207 center1, radius1, 208 data.fColors, data.fPos, 209 data.fCount, tm, 0, &localMatrix); 210 } 211 212 static SkShader* Make2ConicalZeroRadEdgeY(const SkPoint pts[2], const GradData& data, 213 SkShader::TileMode tm, const SkMatrix& localMatrix) { 214 SkPoint center0, center1; 215 SkScalar radius0 = 0.f; 216 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 217 center1.set(SkScalarAve(pts[0].fX, pts[1].fX), 218 SkScalarAve(pts[0].fY, pts[1].fY)); 219 center0.set(center1.fX, center1.fY + radius1); 220 return SkGradientShader::CreateTwoPointConical(center0, radius0, 221 center1, radius1, 222 data.fColors, data.fPos, 223 data.fCount, tm, 0, &localMatrix); 224 } 225 226 static SkShader* Make2ConicalTouchX(const SkPoint pts[2], const GradData& data, 227 SkShader::TileMode tm, const SkMatrix& localMatrix) { 228 SkPoint center0, center1; 229 SkScalar radius0 = (pts[1].fX - pts[0].fX) / 7; 230 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 231 center1.set(SkScalarAve(pts[0].fX, pts[1].fX), 232 SkScalarAve(pts[0].fY, pts[1].fY)); 233 center0.set(center1.fX - radius1 + radius0, center1.fY); 234 return SkGradientShader::CreateTwoPointConical(center0, radius0, 235 center1, radius1, 236 data.fColors, data.fPos, 237 data.fCount, tm, 0, &localMatrix); 238 } 239 240 static SkShader* Make2ConicalTouchY(const SkPoint pts[2], const GradData& data, 241 SkShader::TileMode tm, const SkMatrix& localMatrix) { 242 SkPoint center0, center1; 243 SkScalar radius0 = (pts[1].fX - pts[0].fX) / 7; 244 SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; 245 center1.set(SkScalarAve(pts[0].fX, pts[1].fX), 246 SkScalarAve(pts[0].fY, pts[1].fY)); 247 center0.set(center1.fX, center1.fY + radius1 - radius0); 248 return SkGradientShader::CreateTwoPointConical(center0, radius0, 249 center1, radius1, 250 data.fColors, data.fPos, 251 data.fCount, tm, 0, &localMatrix); 252 } 253 254 static SkShader* Make2ConicalInsideSmallRad(const SkPoint pts[2], const GradData& data, 255 SkShader::TileMode tm, const SkMatrix& localMatrix) { 256 SkPoint center0, center1; 257 center0.set(SkScalarAve(pts[0].fX, pts[1].fX), 258 SkScalarAve(pts[0].fY, pts[1].fY)); 259 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), 260 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); 261 return SkGradientShader::CreateTwoPointConical(center0, 0.0000000000000000001f, 262 center0, (pts[1].fX - pts[0].fX) / 2, 263 data.fColors, data.fPos, data.fCount, tm, 264 0, &localMatrix); 265 } 266 267 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, 268 SkShader::TileMode tm, const SkMatrix& localMatrix); 269 270 static const GradMaker gGradMakersOutside[] = { 271 Make2ConicalOutside, Make2ConicalOutsideFlip, 272 Make2ConicalZeroRadOutside, Make2ConicalZeroRadFlipOutside 273 }; 274 275 static const GradMaker gGradMakersInside[] = { 276 Make2ConicalInside, Make2ConicalInsideFlip, Make2ConicalInsideCenter, 277 Make2ConicalZeroRad, Make2ConicalZeroRadFlip, Make2ConicalZeroRadCenter, 278 }; 279 280 static const GradMaker gGradMakersEdgeCases[] = { 281 Make2ConicalEdgeX, Make2ConicalEdgeY, 282 Make2ConicalZeroRadEdgeX, Make2ConicalZeroRadEdgeY, 283 Make2ConicalTouchX, Make2ConicalTouchY, 284 Make2ConicalInsideSmallRad 285 }; 286 287 288 static const struct { 289 const GradMaker* fMaker; 290 const int fCount; 291 const char* fName; 292 } gGradCases[] = { 293 { gGradMakersOutside, SK_ARRAY_COUNT(gGradMakersOutside), "outside" }, 294 { gGradMakersInside, SK_ARRAY_COUNT(gGradMakersInside), "inside" }, 295 { gGradMakersEdgeCases, SK_ARRAY_COUNT(gGradMakersEdgeCases), "edge" }, 296 }; 297 298 enum GradCaseType { // these must match the order in gGradCases 299 kOutside_GradCaseType, 300 kInside_GradCaseType, 301 kEdge_GradCaseType, 302 }; 303 304 /////////////////////////////////////////////////////////////////////////////// 305 306 class ConicalGradientsGM : public GM { 307 public: 308 ConicalGradientsGM(GradCaseType gradCaseType, bool dither) 309 : fGradCaseType(gradCaseType) 310 , fDither(dither) { 311 this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD)); 312 fName.printf("gradients_2pt_conical_%s%s", gGradCases[gradCaseType].fName, 313 fDither ? "" : "_nodither"); 314 } 315 316 protected: 317 SkString onShortName() { 318 return fName; 319 } 320 321 virtual SkISize onISize() { return SkISize::Make(840, 815); } 322 323 virtual void onDraw(SkCanvas* canvas) { 324 325 SkPoint pts[2] = { 326 { 0, 0 }, 327 { SkIntToScalar(100), SkIntToScalar(100) } 328 }; 329 SkShader::TileMode tm = SkShader::kClamp_TileMode; 330 SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) }; 331 SkPaint paint; 332 paint.setAntiAlias(true); 333 paint.setDither(fDither); 334 335 canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); 336 337 const GradMaker* gradMaker = gGradCases[fGradCaseType].fMaker; 338 const int count = gGradCases[fGradCaseType].fCount; 339 340 for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) { 341 canvas->save(); 342 for (int j = 0; j < count; j++) { 343 SkMatrix scale = SkMatrix::I(); 344 345 if (i == 3) { // if the clamp case 346 scale.setScale(0.5f, 0.5f); 347 scale.postTranslate(25.f, 25.f); 348 } 349 350 SkShader* shader = gradMaker[j](pts, gGradData[i], tm, scale); 351 paint.setShader(shader); 352 canvas->drawRect(r, paint); 353 shader->unref(); 354 canvas->translate(0, SkIntToScalar(120)); 355 } 356 canvas->restore(); 357 canvas->translate(SkIntToScalar(120), 0); 358 } 359 } 360 361 private: 362 typedef GM INHERITED; 363 364 GradCaseType fGradCaseType; 365 SkString fName; 366 bool fDither; 367 }; 368 /////////////////////////////////////////////////////////////////////////////// 369 370 DEF_GM( return new ConicalGradientsGM(kInside_GradCaseType, true); ) 371 DEF_GM( return new ConicalGradientsGM(kOutside_GradCaseType, true); ) 372 DEF_GM( return new ConicalGradientsGM(kEdge_GradCaseType, true); ) 373 374 DEF_GM( return new ConicalGradientsGM(kInside_GradCaseType, false); ) 375 DEF_GM( return new ConicalGradientsGM(kOutside_GradCaseType, false); ) 376 DEF_GM( return new ConicalGradientsGM(kEdge_GradCaseType, false); ) 377 378 } 379
