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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 |
11 #include "SkBitmap.h" | 11 #include "SkBitmap.h" |
12 #include "SkFlattenable.h" | 12 #include "SkFlattenable.h" |
13 #include "SkMask.h" | 13 #include "SkMask.h" |
14 #include "SkMatrix.h" | 14 #include "SkMatrix.h" |
15 #include "SkPaint.h" | 15 #include "SkPaint.h" |
16 #include "../gpu/GrColor.h" | 16 #include "../gpu/GrColor.h" |
17 | 17 |
18 class SkPath; | 18 class SkPath; |
19 class SkPicture; | 19 class SkPicture; |
20 class SkXfermode; | 20 class SkXfermode; |
21 class GrContext; | 21 class GrContext; |
22 class GrFragmentProcessor; | 22 class GrFragmentProcessor; |
23 class GrShaderDataManager; | 23 class GrProcessorDataManager; |
24 | 24 |
25 /** \class SkShader | 25 /** \class SkShader |
26 * | 26 * |
27 * Shaders specify the source color(s) for what is being drawn. If a paint | 27 * Shaders specify the source color(s) for what is being drawn. If a paint |
28 * has no shader, then the paint's color is used. If the paint has a | 28 * has no shader, then the paint's color is used. If the paint has a |
29 * shader, then the shader's color(s) are use instead, but they are | 29 * shader, then the shader's color(s) are use instead, but they are |
30 * modulated by the paint's alpha. This makes it easy to create a shader | 30 * modulated by the paint's alpha. This makes it easy to create a shader |
31 * once (e.g. bitmap tiling or gradient) and then change its transparency | 31 * once (e.g. bitmap tiling or gradient) and then change its transparency |
32 * w/o having to modify the original shader... only the paint's alpha needs | 32 * w/o having to modify the original shader... only the paint's alpha needs |
33 * to be modified. | 33 * to be modified. |
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358 * the paint's color as then many GPU shaders may be generated. | 358 * the paint's color as then many GPU shaders may be generated. |
359 * | 359 * |
360 * The GrContext may be used by the effect to create textures. The GPU devi
ce does not | 360 * The GrContext may be used by the effect to create textures. The GPU devi
ce does not |
361 * call createContext. Instead we pass the SkPaint here in case the shader
needs paint info. | 361 * call createContext. Instead we pass the SkPaint here in case the shader
needs paint info. |
362 * | 362 * |
363 * A view matrix is always required to create the correct GrFragmentProcess
or. Some shaders | 363 * A view matrix is always required to create the correct GrFragmentProcess
or. Some shaders |
364 * may also use the optional localMatrix to define a matrix relevant only f
or sampling. | 364 * may also use the optional localMatrix to define a matrix relevant only f
or sampling. |
365 */ | 365 */ |
366 virtual bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix&
viewM, | 366 virtual bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix&
viewM, |
367 const SkMatrix* localMatrix, GrColor*, | 367 const SkMatrix* localMatrix, GrColor*, |
368 GrShaderDataManager*, GrFragmentProcessor**
) const; | 368 GrProcessorDataManager*, GrFragmentProcesso
r**) const; |
369 | 369 |
370 /** | 370 /** |
371 * If the shader can represent its "average" luminance in a single color, r
eturn true and | 371 * If the shader can represent its "average" luminance in a single color, r
eturn true and |
372 * if color is not NULL, return that color. If it cannot, return false and
ignore the color | 372 * if color is not NULL, return that color. If it cannot, return false and
ignore the color |
373 * parameter. | 373 * parameter. |
374 * | 374 * |
375 * Note: if this returns true, the returned color will always be opaque, as
only the RGB | 375 * Note: if this returns true, the returned color will always be opaque, as
only the RGB |
376 * components are used to compute luminance. | 376 * components are used to compute luminance. |
377 */ | 377 */ |
378 bool asLuminanceColor(SkColor*) const; | 378 bool asLuminanceColor(SkColor*) const; |
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475 // constructors. | 475 // constructors. |
476 SkMatrix fLocalMatrix; | 476 SkMatrix fLocalMatrix; |
477 | 477 |
478 // So the SkLocalMatrixShader can whack fLocalMatrix in its SkReadBuffer con
structor. | 478 // So the SkLocalMatrixShader can whack fLocalMatrix in its SkReadBuffer con
structor. |
479 friend class SkLocalMatrixShader; | 479 friend class SkLocalMatrixShader; |
480 | 480 |
481 typedef SkFlattenable INHERITED; | 481 typedef SkFlattenable INHERITED; |
482 }; | 482 }; |
483 | 483 |
484 #endif | 484 #endif |
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