senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 The Android Open Source Project |
| 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 "SkLightingImageFilter.h" |
| 9 | #include "SkBitmap.h" |
| 10 | #include "SkColorPriv.h" |
| 11 | |
| 12 | // FIXME: Eventually, this should be implemented properly, and put in |
| 13 | // SkScalar.h. |
| 14 | #define SkScalarPow(x, y) SkFloatToScalar(powf(SkScalarToFloat(x), SkScalarToFloat(y))) |
| 15 | namespace { |
| 16 | |
| 17 | const SkScalar gOneThird = SkScalarInvert(SkIntToScalar(3)); |
| 18 | const SkScalar gTwoThirds = SkScalarDiv(SkIntToScalar(2), SkIntToScalar(3)); |
| 19 | const SkScalar gOneHalf = SkFloatToScalar(0.5f); |
| 20 | const SkScalar gOneQuarter = SkFloatToScalar(0.25f); |
| 21 | |
| 22 | // Shift matrix components to the left, as we advance pixels to the right. |
| 23 | inline void shiftMatrixLeft(int m[9]) { |
| 24 | m[0] = m[1]; |
| 25 | m[3] = m[4]; |
| 26 | m[6] = m[7]; |
| 27 | m[1] = m[2]; |
| 28 | m[4] = m[5]; |
| 29 | m[7] = m[8]; |
| 30 | } |
| 31 | |
| 32 | class DiffuseLightingType { |
| 33 | public: |
| 34 | DiffuseLightingType(SkScalar kd) |
| 35 | : fKD(kd) {} |
| 36 | SkPMColor light(const SkPoint3& normal, const SkPoint3& surfaceTolight, const SkPoint3& lightColor) const { |
| 37 | SkScalar colorScale = SkScalarMul(fKD, normal.dot(surfaceTolight)); |
| 38 | colorScale = SkScalarClampMax(colorScale, SK_Scalar1); |
| 39 | SkPoint3 color(lightColor * colorScale); |
| 40 | return SkPackARGB32(255, |
| 41 | SkScalarFloorToInt(color.fX), |
| 42 | SkScalarFloorToInt(color.fY), |
| 43 | SkScalarFloorToInt(color.fZ)); |
| 44 | } |
| 45 | private: |
| 46 | SkScalar fKD; |
| 47 | }; |
| 48 | |
| 49 | class SpecularLightingType { |
| 50 | public: |
| 51 | SpecularLightingType(SkScalar ks, SkScalar shininess) |
| 52 | : fKS(ks), fShininess(shininess) {} |
| 53 | SkPMColor light(const SkPoint3& normal, const SkPoint3& surfaceTolight, const SkPoint3& lightColor) const { |
| 54 | SkPoint3 halfDir(surfaceTolight); |
| 55 | halfDir.fZ += SK_Scalar1; // eye position is always (0, 0, 1) |
| 56 | halfDir.normalize(); |
| 57 | SkScalar colorScale = SkScalarMul(fKS, |
| 58 | SkScalarPow(normal.dot(halfDir), fShininess)); |
| 59 | colorScale = SkScalarClampMax(colorScale, SK_Scalar1); |
| 60 | SkPoint3 color(lightColor * colorScale); |
| 61 | return SkPackARGB32(SkScalarFloorToInt(color.maxComponent()), |
| 62 | SkScalarFloorToInt(color.fX), |
| 63 | SkScalarFloorToInt(color.fY), |
| 64 | SkScalarFloorToInt(color.fZ)); |
| 65 | } |
| 66 | private: |
| 67 | SkScalar fKS; |
| 68 | SkScalar fShininess; |
| 69 | }; |
| 70 | |
| 71 | inline SkScalar sobel(int a, int b, int c, int d, int e, int f, SkScalar scale) { |
| 72 | return SkScalarMul(SkIntToScalar(-a + b - 2 * c + 2 * d -e + f), scale); |
| 73 | } |
| 74 | |
| 75 | inline SkPoint3 pointToNormal(SkScalar x, SkScalar y, SkScalar surfaceScale) { |
| 76 | SkPoint3 vector(SkScalarMul(-x, surfaceScale), |
| 77 | SkScalarMul(-y, surfaceScale), |
| 78 | SK_Scalar1); |
| 79 | vector.normalize(); |
| 80 | return vector; |
| 81 | } |
| 82 | |
| 83 | inline SkPoint3 topLeftNormal(int m[9], SkScalar surfaceScale) { |
| 84 | return pointToNormal(sobel(0, 0, m[4], m[5], m[7], m[8], gTwoThirds), |
| 85 | sobel(0, 0, m[4], m[7], m[5], m[8], gTwoThirds), |
| 86 | surfaceScale); |
| 87 | } |
| 88 | |
| 89 | inline SkPoint3 topNormal(int m[9], SkScalar surfaceScale) { |
| 90 | return pointToNormal(sobel( 0, 0, m[3], m[5], m[6], m[8], gOneThird), |
| 91 | sobel(m[3], m[6], m[4], m[7], m[5], m[8], gOneHalf), |
| 92 | surfaceScale); |
| 93 | } |
| 94 | |
| 95 | inline SkPoint3 topRightNormal(int m[9], SkScalar surfaceScale) { |
| 96 | return pointToNormal(sobel( 0, 0, m[3], m[4], m[6], m[7], gTwoThirds), |
| 97 | sobel(m[3], m[6], m[4], m[7], 0, 0, gTwoThirds), |
| 98 | surfaceScale); |
| 99 | } |
| 100 | |
| 101 | inline SkPoint3 leftNormal(int m[9], SkScalar surfaceScale) { |
| 102 | return pointToNormal(sobel(m[1], m[2], m[4], m[5], m[7], m[8], gOneHalf), |
| 103 | sobel( 0, 0, m[1], m[7], m[2], m[8], gOneThird), |
| 104 | surfaceScale); |
| 105 | } |
| 106 | |
| 107 | |
| 108 | inline SkPoint3 interiorNormal(int m[9], SkScalar surfaceScale) { |
| 109 | return pointToNormal(sobel(m[0], m[2], m[3], m[5], m[6], m[8], gOneQuarter), |
| 110 | sobel(m[0], m[6], m[1], m[7], m[2], m[8], gOneQuarter), |
| 111 | surfaceScale); |
| 112 | } |
| 113 | |
| 114 | inline SkPoint3 rightNormal(int m[9], SkScalar surfaceScale) { |
| 115 | return pointToNormal(sobel(m[0], m[1], m[3], m[4], m[6], m[7], gOneHalf), |
| 116 | sobel(m[0], m[6], m[1], m[7], 0, 0, gOneThird), |
| 117 | surfaceScale); |
| 118 | } |
| 119 | |
| 120 | inline SkPoint3 bottomLeftNormal(int m[9], SkScalar surfaceScale) { |
| 121 | return pointToNormal(sobel(m[1], m[2], m[4], m[5], 0, 0, gTwoThirds), |
| 122 | sobel( 0, 0, m[1], m[4], m[2], m[5], gTwoThirds), |
| 123 | surfaceScale); |
| 124 | } |
| 125 | |
| 126 | inline SkPoint3 bottomNormal(int m[9], SkScalar surfaceScale) { |
| 127 | return pointToNormal(sobel(m[0], m[2], m[3], m[5], 0, 0, gOneThird), |
| 128 | sobel(m[0], m[3], m[1], m[4], m[2], m[5], gOneHalf), |
| 129 | surfaceScale); |
| 130 | } |
| 131 | |
| 132 | inline SkPoint3 bottomRightNormal(int m[9], SkScalar surfaceScale) { |
| 133 | return pointToNormal(sobel(m[0], m[1], m[3], m[4], 0, 0, gTwoThirds), |
| 134 | sobel(m[0], m[3], m[1], m[4], 0, 0, gTwoThirds), |
| 135 | surfaceScale); |
| 136 | } |
| 137 | |
| 138 | template <class LightingType, class LightType> void lightBitmap(const LightingType& lightingType, const SkLight* light, const SkBitmap& src, SkBitmap* dst, const SkPoint3& lightColor, SkScalar surfaceScale) { |
| 139 | const LightType* l = static_cast<const LightType*>(light); |
| 140 | int y = 0; |
| 141 | { |
| 142 | const SkPMColor* row1 = src.getAddr32(0, 0); |
| 143 | const SkPMColor* row2 = src.getAddr32(0, 1); |
| 144 | SkPMColor* dptr = dst->getAddr32(0, 0); |
| 145 | int m[9]; |
| 146 | int x = 0; |
| 147 | m[4] = SkGetPackedA32(*row1++); |
| 148 | m[5] = SkGetPackedA32(*row1++); |
| 149 | m[7] = SkGetPackedA32(*row2++); |
| 150 | m[8] = SkGetPackedA32(*row2++); |
| 151 | SkPoint3 surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 152 | *dptr++ = lightingType.light(topLeftNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 153 | for (x = 1; x < src.width() - 1; ++x) |
| 154 | { |
| 155 | shiftMatrixLeft(m); |
| 156 | m[5] = SkGetPackedA32(*row1++); |
| 157 | m[8] = SkGetPackedA32(*row2++); |
| 158 | surfaceToLight = l->surfaceToLight(x, 0, m[4], surfaceScale); |
| 159 | *dptr++ = lightingType.light(topNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 160 | } |
| 161 | shiftMatrixLeft(m); |
| 162 | surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 163 | *dptr++ = lightingType.light(topRightNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 164 | } |
| 165 | |
| 166 | for (++y; y < src.height() - 1; ++y) { |
| 167 | const SkPMColor* row0 = src.getAddr32(0, y - 1); |
| 168 | const SkPMColor* row1 = src.getAddr32(0, y); |
| 169 | const SkPMColor* row2 = src.getAddr32(0, y + 1); |
| 170 | SkPMColor* dptr = dst->getAddr32(0, y); |
| 171 | int m[9]; |
| 172 | int x = 0; |
| 173 | m[1] = SkGetPackedA32(*row0++); |
| 174 | m[2] = SkGetPackedA32(*row0++); |
| 175 | m[4] = SkGetPackedA32(*row1++); |
| 176 | m[5] = SkGetPackedA32(*row1++); |
| 177 | m[7] = SkGetPackedA32(*row2++); |
| 178 | m[8] = SkGetPackedA32(*row2++); |
| 179 | SkPoint3 surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 180 | *dptr++ = lightingType.light(leftNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 181 | for (x = 1; x < src.width() - 1; ++x) { |
| 182 | shiftMatrixLeft(m); |
| 183 | m[2] = SkGetPackedA32(*row0++); |
| 184 | m[5] = SkGetPackedA32(*row1++); |
| 185 | m[8] = SkGetPackedA32(*row2++); |
| 186 | surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 187 | *dptr++ = lightingType.light(interiorNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 188 | } |
| 189 | shiftMatrixLeft(m); |
| 190 | surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 191 | *dptr++ = lightingType.light(rightNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 192 | } |
| 193 | |
| 194 | { |
| 195 | const SkPMColor* row0 = src.getAddr32(0, src.height() - 2); |
| 196 | const SkPMColor* row1 = src.getAddr32(0, src.height() - 1); |
| 197 | int x = 0; |
| 198 | SkPMColor* dptr = dst->getAddr32(0, src.height() - 1); |
| 199 | int m[9]; |
| 200 | m[1] = SkGetPackedA32(*row0++); |
| 201 | m[2] = SkGetPackedA32(*row0++); |
| 202 | m[4] = SkGetPackedA32(*row1++); |
| 203 | m[5] = SkGetPackedA32(*row1++); |
| 204 | SkPoint3 surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 205 | *dptr++ = lightingType.light(bottomLeftNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 206 | for (x = 1; x < src.width() - 1; ++x) |
| 207 | { |
| 208 | shiftMatrixLeft(m); |
| 209 | m[2] = SkGetPackedA32(*row0++); |
| 210 | m[5] = SkGetPackedA32(*row1++); |
| 211 | surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 212 | *dptr++ = lightingType.light(bottomNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 213 | } |
| 214 | shiftMatrixLeft(m); |
| 215 | surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale); |
| 216 | *dptr++ = lightingType.light(bottomRightNormal(m, surfaceScale), surfaceToLight, lightColor * l->lightColorScale(surfaceToLight)); |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | SkPoint3 readPoint3(SkFlattenableReadBuffer& buffer) { |
| 221 | SkPoint3 point; |
| 222 | point.fX = buffer.readScalar(); |
| 223 | point.fY = buffer.readScalar(); |
| 224 | point.fZ = buffer.readScalar(); |
| 225 | return point; |
| 226 | }; |
| 227 | |
| 228 | void writePoint3(const SkPoint3& point, SkFlattenableWriteBuffer& buffer) { |
| 229 | buffer.writeScalar(point.fX); |
| 230 | buffer.writeScalar(point.fY); |
| 231 | buffer.writeScalar(point.fZ); |
| 232 | }; |
| 233 | |
| 234 | class SkDiffuseLightingImageFilter : public SkLightingImageFilter { |
| 235 | public: |
| 236 | SkDiffuseLightingImageFilter(SkLight* light, const SkColor& lightColor, |
| 237 | SkScalar surfaceScale, SkScalar kd); |
| 238 | SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDiffuseLightingImageFilter) |
| 239 | |
| 240 | protected: |
| 241 | explicit SkDiffuseLightingImageFilter(SkFlattenableReadBuffer& buffer); |
| 242 | virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE; |
| 243 | virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&, |
| 244 | SkBitmap* result, SkIPoint* offset) SK_OVERRIDE; |
| 245 | |
| 246 | |
| 247 | private: |
| 248 | typedef SkLightingImageFilter INHERITED; |
| 249 | SkScalar fKD; |
| 250 | }; |
| 251 | |
| 252 | class SkSpecularLightingImageFilter : public SkLightingImageFilter { |
| 253 | public: |
| 254 | SkSpecularLightingImageFilter(SkLight* light, const SkColor& lightColor, |
| 255 | SkScalar surfaceScale, SkScalar ks, SkScalar shininess); |
| 256 | SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSpecularLightingImageFilter) |
| 257 | |
| 258 | protected: |
| 259 | explicit SkSpecularLightingImageFilter(SkFlattenableReadBuffer& buffer); |
| 260 | virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE; |
| 261 | virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&, |
| 262 | SkBitmap* result, SkIPoint* offset) SK_OVERRIDE; |
| 263 | |
| 264 | private: |
| 265 | typedef SkLightingImageFilter INHERITED; |
| 266 | SkScalar fKS; |
| 267 | SkScalar fShininess; |
| 268 | }; |
| 269 | |
| 270 | }; |
| 271 | |
| 272 | class SkLight : public SkFlattenable { |
| 273 | public: |
robertphillips@google.com | 0456e0b | 2012-06-27 14:03:26 +0000 | [diff] [blame] | 274 | SK_DECLARE_INST_COUNT(SkLight) |
| 275 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 276 | enum LightType { |
| 277 | kDistant_LightType, |
| 278 | kPoint_LightType, |
| 279 | kSpot_LightType, |
| 280 | }; |
| 281 | virtual LightType type() const = 0; |
| 282 | |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 283 | protected: |
| 284 | SkLight() {} |
| 285 | SkLight(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {} |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 286 | virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE { |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 287 | INHERITED::flatten(buffer); |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 288 | } |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 289 | |
| 290 | private: |
| 291 | typedef SkFlattenable INHERITED; |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 292 | }; |
| 293 | |
robertphillips@google.com | 0456e0b | 2012-06-27 14:03:26 +0000 | [diff] [blame] | 294 | SK_DEFINE_INST_COUNT(SkLight) |
| 295 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 296 | class SkDistantLight : public SkLight { |
| 297 | public: |
| 298 | SkDistantLight(const SkPoint3& direction) : fDirection(direction) { |
| 299 | } |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 300 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 301 | SkPoint3 surfaceToLight(int x, int y, int z, SkScalar surfaceScale) const { |
| 302 | return fDirection; |
| 303 | }; |
| 304 | SkScalar lightColorScale(const SkPoint3&) const { return SK_Scalar1; } |
| 305 | virtual LightType type() const { return kDistant_LightType; } |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 306 | |
| 307 | SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDistantLight) |
| 308 | |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 309 | protected: |
| 310 | SkDistantLight(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| 311 | fDirection = readPoint3(buffer); |
| 312 | } |
| 313 | virtual void flatten(SkFlattenableWriteBuffer& buffer) const { |
| 314 | INHERITED::flatten(buffer); |
| 315 | writePoint3(fDirection, buffer); |
| 316 | } |
| 317 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 318 | private: |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 319 | typedef SkLight INHERITED; |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 320 | SkPoint3 fDirection; |
| 321 | }; |
| 322 | |
| 323 | class SkPointLight : public SkLight { |
| 324 | public: |
| 325 | SkPointLight(const SkPoint3& location) |
| 326 | : fLocation(location) {} |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 327 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 328 | SkPoint3 surfaceToLight(int x, int y, int z, SkScalar surfaceScale) const { |
| 329 | SkPoint3 direction(fLocation.fX - SkIntToScalar(x), |
| 330 | fLocation.fY - SkIntToScalar(y), |
| 331 | fLocation.fZ - SkScalarMul(SkIntToScalar(z), surfaceScale)); |
| 332 | direction.normalize(); |
| 333 | return direction; |
| 334 | }; |
| 335 | SkScalar lightColorScale(const SkPoint3&) const { return SK_Scalar1; } |
| 336 | virtual LightType type() const { return kPoint_LightType; } |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 337 | |
| 338 | SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPointLight) |
| 339 | |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 340 | protected: |
| 341 | SkPointLight(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| 342 | fLocation = readPoint3(buffer); |
| 343 | } |
| 344 | virtual void flatten(SkFlattenableWriteBuffer& buffer) const { |
| 345 | INHERITED::flatten(buffer); |
| 346 | writePoint3(fLocation, buffer); |
| 347 | } |
| 348 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 349 | private: |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 350 | typedef SkLight INHERITED; |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 351 | SkPoint3 fLocation; |
| 352 | }; |
| 353 | |
| 354 | class SkSpotLight : public SkLight { |
| 355 | public: |
| 356 | SkSpotLight(const SkPoint3& location, const SkPoint3& target, SkScalar specularExponent, SkScalar cutoffAngle) |
| 357 | : fLocation(location), |
| 358 | fTarget(target), |
| 359 | fSpecularExponent(specularExponent) |
| 360 | { |
| 361 | fS = target - location; |
| 362 | fS.normalize(); |
| 363 | fCosOuterConeAngle = SkScalarCos(SkDegreesToRadians(cutoffAngle)); |
| 364 | const SkScalar antiAliasThreshold = SkFloatToScalar(0.016f); |
| 365 | fCosInnerConeAngle = fCosOuterConeAngle + antiAliasThreshold; |
| 366 | fConeScale = SkScalarInvert(antiAliasThreshold); |
| 367 | } |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 368 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 369 | SkPoint3 surfaceToLight(int x, int y, int z, SkScalar surfaceScale) const { |
| 370 | SkPoint3 direction(fLocation.fX - SkIntToScalar(x), |
| 371 | fLocation.fY - SkIntToScalar(y), |
| 372 | fLocation.fZ - SkScalarMul(SkIntToScalar(z), surfaceScale)); |
| 373 | direction.normalize(); |
| 374 | return direction; |
| 375 | }; |
| 376 | SkScalar lightColorScale(const SkPoint3& surfaceToLight) const { |
| 377 | SkScalar cosAngle = -surfaceToLight.dot(fS); |
| 378 | if (cosAngle < fCosOuterConeAngle) { |
| 379 | return 0; |
| 380 | } |
| 381 | SkScalar scale = SkScalarPow(cosAngle, fSpecularExponent); |
| 382 | if (cosAngle < fCosInnerConeAngle) { |
| 383 | scale = SkScalarMul(scale, cosAngle - fCosOuterConeAngle); |
| 384 | return SkScalarMul(scale, fConeScale); |
| 385 | } |
| 386 | return scale; |
| 387 | } |
| 388 | |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 389 | virtual LightType type() const { return kSpot_LightType; } |
| 390 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 391 | SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSpotLight) |
| 392 | |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 393 | protected: |
| 394 | SkSpotLight(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| 395 | fLocation = readPoint3(buffer); |
| 396 | fTarget = readPoint3(buffer); |
| 397 | fSpecularExponent = buffer.readScalar(); |
| 398 | fCosOuterConeAngle = buffer.readScalar(); |
| 399 | fCosInnerConeAngle = buffer.readScalar(); |
| 400 | fConeScale = buffer.readScalar(); |
| 401 | fS = readPoint3(buffer); |
| 402 | } |
| 403 | virtual void flatten(SkFlattenableWriteBuffer& buffer) const { |
| 404 | INHERITED::flatten(buffer); |
| 405 | writePoint3(fLocation, buffer); |
| 406 | writePoint3(fTarget, buffer); |
| 407 | buffer.writeScalar(fSpecularExponent); |
| 408 | buffer.writeScalar(fCosOuterConeAngle); |
| 409 | buffer.writeScalar(fCosInnerConeAngle); |
| 410 | buffer.writeScalar(fConeScale); |
| 411 | writePoint3(fS, buffer); |
| 412 | } |
| 413 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 414 | private: |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 415 | typedef SkLight INHERITED; |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 416 | SkPoint3 fLocation; |
| 417 | SkPoint3 fTarget; |
| 418 | SkScalar fSpecularExponent; |
| 419 | SkScalar fCosOuterConeAngle; |
| 420 | SkScalar fCosInnerConeAngle; |
| 421 | SkScalar fConeScale; |
| 422 | SkPoint3 fS; |
| 423 | }; |
| 424 | |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 425 | SkLightingImageFilter::SkLightingImageFilter(SkLight* light, const SkColor& lightColor, SkScalar surfaceScale) |
| 426 | : fLight(light), |
| 427 | fLightColor(SkIntToScalar(SkColorGetR(lightColor)), |
| 428 | SkIntToScalar(SkColorGetG(lightColor)), |
| 429 | SkIntToScalar(SkColorGetB(lightColor))), |
| 430 | fSurfaceScale(SkScalarDiv(surfaceScale, SkIntToScalar(255))) |
| 431 | { |
| 432 | SkASSERT(fLight); |
reed@google.com | 51f3866 | 2012-06-27 14:24:29 +0000 | [diff] [blame^] | 433 | // our caller knows that we take ownership of the light, so we don't |
| 434 | // need to call ref() here. |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | SkImageFilter* SkLightingImageFilter::CreateDistantLitDiffuse( |
| 438 | const SkPoint3& direction, const SkColor& lightColor, SkScalar surfaceScale, |
| 439 | SkScalar kd) { |
| 440 | return new SkDiffuseLightingImageFilter( |
| 441 | new SkDistantLight(direction), lightColor, surfaceScale, kd); |
| 442 | } |
| 443 | |
| 444 | SkImageFilter* SkLightingImageFilter::CreatePointLitDiffuse( |
| 445 | SkPoint3& location, const SkColor& lightColor, SkScalar surfaceScale, |
| 446 | SkScalar kd) { |
| 447 | return new SkDiffuseLightingImageFilter( |
| 448 | new SkPointLight(location), lightColor, surfaceScale, kd); |
| 449 | } |
| 450 | |
| 451 | SkImageFilter* SkLightingImageFilter::CreateSpotLitDiffuse( |
| 452 | const SkPoint3& location, const SkPoint3& target, SkScalar specularExponent, |
| 453 | SkScalar cutoffAngle, const SkColor& lightColor, SkScalar surfaceScale, |
| 454 | SkScalar kd) { |
| 455 | return new SkDiffuseLightingImageFilter( |
| 456 | new SkSpotLight(location, target, specularExponent, cutoffAngle), |
| 457 | lightColor, surfaceScale, kd); |
| 458 | } |
| 459 | |
| 460 | SkImageFilter* SkLightingImageFilter::CreateDistantLitSpecular( |
| 461 | const SkPoint3& direction, const SkColor& lightColor, SkScalar surfaceScale, |
| 462 | SkScalar ks, SkScalar shininess) { |
| 463 | return new SkSpecularLightingImageFilter( |
| 464 | new SkDistantLight(direction), lightColor, surfaceScale, ks, shininess); |
| 465 | } |
| 466 | |
| 467 | SkImageFilter* SkLightingImageFilter::CreatePointLitSpecular( |
| 468 | SkPoint3& location, |
| 469 | const SkColor& lightColor, SkScalar surfaceScale, SkScalar ks, |
| 470 | SkScalar shininess) { |
| 471 | return new SkSpecularLightingImageFilter( |
| 472 | new SkPointLight(location), lightColor, surfaceScale, ks, shininess); |
| 473 | } |
| 474 | |
| 475 | SkImageFilter* SkLightingImageFilter::CreateSpotLitSpecular( |
| 476 | const SkPoint3& location, |
| 477 | const SkPoint3& target, SkScalar specularExponent, SkScalar cutoffAngle, |
| 478 | const SkColor& lightColor, SkScalar surfaceScale, SkScalar ks, |
| 479 | SkScalar shininess) { |
| 480 | return new SkSpecularLightingImageFilter( |
| 481 | new SkSpotLight(location, target, specularExponent, cutoffAngle), |
| 482 | lightColor, surfaceScale, ks, shininess); |
| 483 | } |
| 484 | |
| 485 | SkLightingImageFilter::~SkLightingImageFilter() { |
| 486 | fLight->unref(); |
| 487 | } |
| 488 | |
| 489 | SkLightingImageFilter::SkLightingImageFilter(SkFlattenableReadBuffer& buffer) |
| 490 | : INHERITED(buffer) |
| 491 | { |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 492 | fLight = (SkLight*)buffer.readFlattenable(); |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 493 | fLightColor = readPoint3(buffer); |
| 494 | fSurfaceScale = buffer.readScalar(); |
| 495 | } |
| 496 | |
| 497 | void SkLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 498 | this->INHERITED::flatten(buffer); |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 499 | buffer.writeFlattenable(fLight); |
senorblanco@chromium.org | f49b429 | 2012-06-22 21:01:23 +0000 | [diff] [blame] | 500 | writePoint3(fLightColor, buffer); |
| 501 | buffer.writeScalar(fSurfaceScale); |
| 502 | } |
| 503 | |
| 504 | SkDiffuseLightingImageFilter::SkDiffuseLightingImageFilter(SkLight* light, const SkColor& lightColor, SkScalar surfaceScale, SkScalar kd) |
| 505 | : SkLightingImageFilter(light, lightColor, surfaceScale), |
| 506 | fKD(kd) |
| 507 | { |
| 508 | } |
| 509 | |
| 510 | SkDiffuseLightingImageFilter::SkDiffuseLightingImageFilter(SkFlattenableReadBuffer& buffer) |
| 511 | : INHERITED(buffer) |
| 512 | { |
| 513 | fKD = buffer.readScalar(); |
| 514 | } |
| 515 | |
| 516 | void SkDiffuseLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 517 | this->INHERITED::flatten(buffer); |
| 518 | buffer.writeScalar(fKD); |
| 519 | } |
| 520 | |
| 521 | bool SkDiffuseLightingImageFilter::onFilterImage(Proxy*, |
| 522 | const SkBitmap& src, |
| 523 | const SkMatrix&, |
| 524 | SkBitmap* dst, |
| 525 | SkIPoint*) { |
| 526 | if (src.config() != SkBitmap::kARGB_8888_Config) { |
| 527 | return false; |
| 528 | } |
| 529 | SkAutoLockPixels alp(src); |
| 530 | if (!src.getPixels()) { |
| 531 | return false; |
| 532 | } |
| 533 | if (src.width() < 2 || src.height() < 2) { |
| 534 | return false; |
| 535 | } |
| 536 | dst->setConfig(src.config(), src.width(), src.height()); |
| 537 | dst->allocPixels(); |
| 538 | |
| 539 | DiffuseLightingType lightingType(fKD); |
| 540 | switch (light()->type()) { |
| 541 | case SkLight::kDistant_LightType: |
| 542 | lightBitmap<DiffuseLightingType, SkDistantLight>(lightingType, light(), src, dst, lightColor(), surfaceScale()); |
| 543 | break; |
| 544 | case SkLight::kPoint_LightType: |
| 545 | lightBitmap<DiffuseLightingType, SkPointLight>(lightingType, light(), src, dst, lightColor(), surfaceScale()); |
| 546 | break; |
| 547 | case SkLight::kSpot_LightType: |
| 548 | lightBitmap<DiffuseLightingType, SkSpotLight>(lightingType, light(), src, dst, lightColor(), surfaceScale()); |
| 549 | break; |
| 550 | } |
| 551 | return true; |
| 552 | } |
| 553 | |
| 554 | SkSpecularLightingImageFilter::SkSpecularLightingImageFilter(SkLight* light, const SkColor& lightColor, SkScalar surfaceScale, SkScalar ks, SkScalar shininess) |
| 555 | : SkLightingImageFilter(light, lightColor, surfaceScale), |
| 556 | fKS(ks), |
| 557 | fShininess(shininess) |
| 558 | { |
| 559 | } |
| 560 | |
| 561 | SkSpecularLightingImageFilter::SkSpecularLightingImageFilter(SkFlattenableReadBuffer& buffer) |
| 562 | : INHERITED(buffer) |
| 563 | { |
| 564 | fKS = buffer.readScalar(); |
| 565 | fShininess = buffer.readScalar(); |
| 566 | } |
| 567 | |
| 568 | void SkSpecularLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 569 | this->INHERITED::flatten(buffer); |
| 570 | buffer.writeScalar(fKS); |
| 571 | buffer.writeScalar(fShininess); |
| 572 | } |
| 573 | |
| 574 | bool SkSpecularLightingImageFilter::onFilterImage(Proxy*, |
| 575 | const SkBitmap& src, |
| 576 | const SkMatrix&, |
| 577 | SkBitmap* dst, |
| 578 | SkIPoint*) { |
| 579 | if (src.config() != SkBitmap::kARGB_8888_Config) { |
| 580 | return false; |
| 581 | } |
| 582 | SkAutoLockPixels alp(src); |
| 583 | if (!src.getPixels()) { |
| 584 | return false; |
| 585 | } |
| 586 | if (src.width() < 2 || src.height() < 2) { |
| 587 | return false; |
| 588 | } |
| 589 | dst->setConfig(src.config(), src.width(), src.height()); |
| 590 | dst->allocPixels(); |
| 591 | |
| 592 | SpecularLightingType lightingType(fKS, fShininess); |
| 593 | switch (light()->type()) { |
| 594 | case SkLight::kDistant_LightType: |
| 595 | lightBitmap<SpecularLightingType, SkDistantLight>(lightingType, light(), src, dst, lightColor(), surfaceScale()); |
| 596 | break; |
| 597 | case SkLight::kPoint_LightType: |
| 598 | lightBitmap<SpecularLightingType, SkPointLight>(lightingType, light(), src, dst, lightColor(), surfaceScale()); |
| 599 | break; |
| 600 | case SkLight::kSpot_LightType: |
| 601 | lightBitmap<SpecularLightingType, SkSpotLight>(lightingType, light(), src, dst, lightColor(), surfaceScale()); |
| 602 | break; |
| 603 | } |
| 604 | return true; |
| 605 | } |
| 606 | |
djsollen@google.com | 0833777 | 2012-06-26 14:33:13 +0000 | [diff] [blame] | 607 | SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkLightingImageFilter) |
| 608 | SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDiffuseLightingImageFilter) |
| 609 | SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSpecularLightingImageFilter) |
| 610 | SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDistantLight) |
| 611 | SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkPointLight) |
| 612 | SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSpotLight) |
| 613 | SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |