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1 /* | 1 /* |
2 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkShader_DEFINED | 8 #ifndef SkShader_DEFINED |
9 #define SkShader_DEFINED | 9 #define SkShader_DEFINED |
10 | 10 |
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216 */ | 216 */ |
217 virtual size_t contextSize() const; | 217 virtual size_t contextSize() const; |
218 | 218 |
219 /** | 219 /** |
220 * Helper to check the flags to know if it is legal to call shadeSpan16() | 220 * Helper to check the flags to know if it is legal to call shadeSpan16() |
221 */ | 221 */ |
222 static bool CanCallShadeSpan16(uint32_t flags) { | 222 static bool CanCallShadeSpan16(uint32_t flags) { |
223 return (flags & kHasSpan16_Flag) != 0; | 223 return (flags & kHasSpan16_Flag) != 0; |
224 } | 224 } |
225 | 225 |
| 226 #ifdef SK_SUPPORT_LEGACY_SHADERBITMAPTYPE |
| 227 public: |
| 228 #else |
| 229 protected: |
| 230 #endif |
226 /** | 231 /** |
227 * Returns true if this shader is just a bitmap, and if not null, returns t
he bitmap, | 232 Gives method bitmap should be read to implement a shader. |
228 * localMatrix, and tilemodes. If this is not a bitmap, returns false and i
gnores the | 233 Also determines number and interpretation of "extra" parameters returned |
229 * out-parameters. | 234 by asABitmap |
230 */ | 235 */ |
231 bool isABitmap(SkBitmap* outTexture, SkMatrix* outMatrix, TileMode xy[2]) co
nst { | 236 enum BitmapType { |
232 return this->onIsABitmap(outTexture, outMatrix, xy); | 237 kNone_BitmapType, //<! Shader is not represented as a bitmap |
| 238 kDefault_BitmapType,//<! Access bitmap using local coords transformed |
| 239 }; |
| 240 /** Optional methods for shaders that can pretend to be a bitmap/texture |
| 241 to play along with opengl. Default just returns kNone_BitmapType and |
| 242 ignores the out parameters. |
| 243 |
| 244 @param outTexture if non-NULL will be the bitmap representing the shader |
| 245 after return. |
| 246 @param outMatrix if non-NULL will be the matrix to apply to vertices |
| 247 to access the bitmap after return. |
| 248 @param xy if non-NULL will be the tile modes that should be |
| 249 used to access the bitmap after return. |
| 250 @param twoPointRadialParams Two extra return values needed for two point |
| 251 radial bitmaps. The first is the x-offset of |
| 252 the second point and the second is the radiu
s |
| 253 about the first point. |
| 254 */ |
| 255 virtual BitmapType asABitmap(SkBitmap* outTexture, SkMatrix* outMatrix, |
| 256 TileMode xy[2]) const; |
| 257 |
| 258 public: |
| 259 bool isABitmap(SkBitmap* bitmap, SkMatrix* matrix, TileMode xy[2]) const { |
| 260 return this->asABitmap(bitmap, matrix, xy) == kDefault_BitmapType; |
233 } | 261 } |
234 | |
235 bool isABitmap() const { | 262 bool isABitmap() const { |
236 return this->isABitmap(nullptr, nullptr, nullptr); | 263 return this->isABitmap(nullptr, nullptr, nullptr); |
237 } | 264 } |
238 | 265 |
239 /** | 266 /** |
240 * If the shader subclass can be represented as a gradient, asAGradient | 267 * If the shader subclass can be represented as a gradient, asAGradient |
241 * returns the matching GradientType enum (or kNone_GradientType if it | 268 * returns the matching GradientType enum (or kNone_GradientType if it |
242 * cannot). Also, if info is not null, asAGradient populates info with | 269 * cannot). Also, if info is not null, asAGradient populates info with |
243 * the relevant (see below) parameters for the gradient. fColorCount | 270 * the relevant (see below) parameters for the gradient. fColorCount |
244 * is both an input and output parameter. On input, it indicates how | 271 * is both an input and output parameter. On input, it indicates how |
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418 | 445 |
419 /** | 446 /** |
420 * Your subclass must also override contextSize() if it overrides onCreateC
ontext(). | 447 * Your subclass must also override contextSize() if it overrides onCreateC
ontext(). |
421 * Base class impl returns NULL. | 448 * Base class impl returns NULL. |
422 */ | 449 */ |
423 virtual Context* onCreateContext(const ContextRec&, void* storage) const; | 450 virtual Context* onCreateContext(const ContextRec&, void* storage) const; |
424 | 451 |
425 virtual bool onAsLuminanceColor(SkColor*) const { | 452 virtual bool onAsLuminanceColor(SkColor*) const { |
426 return false; | 453 return false; |
427 } | 454 } |
428 | |
429 virtual bool onIsABitmap(SkBitmap*, SkMatrix*, TileMode[2]) const { | |
430 return false; | |
431 } | |
432 | |
433 private: | 455 private: |
434 // This is essentially const, but not officially so it can be modified in | 456 // This is essentially const, but not officially so it can be modified in |
435 // constructors. | 457 // constructors. |
436 SkMatrix fLocalMatrix; | 458 SkMatrix fLocalMatrix; |
437 | 459 |
438 // So the SkLocalMatrixShader can whack fLocalMatrix in its SkReadBuffer con
structor. | 460 // So the SkLocalMatrixShader can whack fLocalMatrix in its SkReadBuffer con
structor. |
439 friend class SkLocalMatrixShader; | 461 friend class SkLocalMatrixShader; |
440 | 462 |
441 typedef SkFlattenable INHERITED; | 463 typedef SkFlattenable INHERITED; |
442 }; | 464 }; |
443 | 465 |
444 #endif | 466 #endif |
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