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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 | 8 |
9 #ifndef SkShader_DEFINED | 9 #ifndef SkShader_DEFINED |
10 #define SkShader_DEFINED | 10 #define SkShader_DEFINED |
11 | 11 |
12 #include "SkBitmap.h" | 12 #include "SkBitmap.h" |
13 #include "SkFlattenable.h" | 13 #include "SkFlattenable.h" |
14 #include "SkMask.h" | 14 #include "SkMask.h" |
15 #include "SkMatrix.h" | 15 #include "SkMatrix.h" |
16 #include "SkPaint.h" | 16 #include "SkPaint.h" |
17 | 17 |
18 class SkPath; | 18 class SkPath; |
19 class SkPicture; | 19 class SkPicture; |
20 class SkXfermode; | |
20 class GrContext; | 21 class GrContext; |
21 class GrEffectRef; | 22 class GrEffectRef; |
22 | 23 |
23 /** \class SkShader | 24 /** \class SkShader |
24 * | 25 * |
25 * Shaders specify the source color(s) for what is being drawn. If a paint | 26 * Shaders specify the source color(s) for what is being drawn. If a paint |
26 * has no shader, then the paint's color is used. If the paint has a | 27 * has no shader, then the paint's color is used. If the paint has a |
27 * shader, then the shader's color(s) are use instead, but they are | 28 * shader, then the shader's color(s) are use instead, but they are |
28 * modulated by the paint's alpha. This makes it easy to create a shader | 29 * modulated by the paint's alpha. This makes it easy to create a shader |
29 * once (e.g. bitmap tiling or gradient) and then change its transparency | 30 * once (e.g. bitmap tiling or gradient) and then change its transparency |
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349 SkScalar* fColorOffsets; //!< The unit offset for color transitions. | 350 SkScalar* fColorOffsets; //!< The unit offset for color transitions. |
350 SkPoint fPoint[2]; //!< Type specific, see above. | 351 SkPoint fPoint[2]; //!< Type specific, see above. |
351 SkScalar fRadius[2]; //!< Type specific, see above. | 352 SkScalar fRadius[2]; //!< Type specific, see above. |
352 TileMode fTileMode; //!< The tile mode used. | 353 TileMode fTileMode; //!< The tile mode used. |
353 uint32_t fGradientFlags; //!< see SkGradientShader::Flags | 354 uint32_t fGradientFlags; //!< see SkGradientShader::Flags |
354 }; | 355 }; |
355 | 356 |
356 virtual GradientType asAGradient(GradientInfo* info) const; | 357 virtual GradientType asAGradient(GradientInfo* info) const; |
357 | 358 |
358 /** | 359 /** |
360 * If the shader subclass is composed of two shaders, return true, and if r ec is not NULL, | |
361 * fill it out with info about the shader. | |
reed1
2014/05/13 18:00:24
? What is the ownership-rule for the returned poin
scroggo
2014/05/14 13:51:26
Uploaded https://codereview.chromium.org/288713002
| |
362 */ | |
363 | |
364 struct ComposeRec { | |
365 const SkShader* fShaderA; | |
366 const SkShader* fShaderB; | |
367 const SkXfermode* fMode; | |
368 }; | |
369 | |
370 virtual bool asACompose(ComposeRec* rec) const { return false; } | |
371 | |
372 | |
373 /** | |
359 * If the shader subclass has a GrEffect implementation, this resturns the effect to install. | 374 * If the shader subclass has a GrEffect implementation, this resturns the effect to install. |
360 * The incoming color to the effect has r=g=b=a all extracted from the SkPa int's alpha. | 375 * The incoming color to the effect has r=g=b=a all extracted from the SkPa int's alpha. |
361 * The output color should be the computed SkShader premul color modulated by the incoming | 376 * The output color should be the computed SkShader premul color modulated by the incoming |
362 * color. The GrContext may be used by the effect to create textures. The G PU device does not | 377 * color. The GrContext may be used by the effect to create textures. The G PU device does not |
363 * call createContext. Instead we pass the SkPaint here in case the shader needs paint info. | 378 * call createContext. Instead we pass the SkPaint here in case the shader needs paint info. |
364 */ | 379 */ |
365 virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint& paint, | 380 virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint& paint, |
366 const SkMatrix* localMatrixOrNull) const; | 381 const SkMatrix* localMatrixOrNull) const; |
367 | 382 |
383 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK | |
384 /** | |
385 * If the shader is a custom shader which has data the caller might want, c all this function | |
386 * to get that data. | |
387 */ | |
388 virtual bool asACustomShader(void** customData) const { return false; } | |
389 #endif | |
390 | |
368 ////////////////////////////////////////////////////////////////////////// | 391 ////////////////////////////////////////////////////////////////////////// |
369 // Factory methods for stock shaders | 392 // Factory methods for stock shaders |
370 | 393 |
371 /** | 394 /** |
372 * Call this to create a new "empty" shader, that will not draw anything. | 395 * Call this to create a new "empty" shader, that will not draw anything. |
373 */ | 396 */ |
374 static SkShader* CreateEmptyShader(); | 397 static SkShader* CreateEmptyShader(); |
375 | 398 |
376 /** Call this to create a new shader that will draw with the specified bitma p. | 399 /** Call this to create a new shader that will draw with the specified bitma p. |
377 * | 400 * |
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436 */ | 459 */ |
437 virtual Context* onCreateContext(const ContextRec&, void* storage) const; | 460 virtual Context* onCreateContext(const ContextRec&, void* storage) const; |
438 | 461 |
439 private: | 462 private: |
440 SkMatrix fLocalMatrix; | 463 SkMatrix fLocalMatrix; |
441 | 464 |
442 typedef SkFlattenable INHERITED; | 465 typedef SkFlattenable INHERITED; |
443 }; | 466 }; |
444 | 467 |
445 #endif | 468 #endif |
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