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1 | 1 |
2 /* | 2 /* |
3 * Copyright 2006 The Android Open Source Project | 3 * Copyright 2006 The Android Open Source Project |
4 * | 4 * |
5 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 6 * found in the LICENSE file. |
7 */ | 7 */ |
8 | 8 |
9 | 9 |
10 #ifndef SkMaskFilter_DEFINED | 10 #ifndef SkMaskFilter_DEFINED |
11 #define SkMaskFilter_DEFINED | 11 #define SkMaskFilter_DEFINED |
12 | 12 |
13 #include "SkFlattenable.h" | 13 #include "SkFlattenable.h" |
14 #include "SkMask.h" | 14 #include "SkMask.h" |
15 #include "SkPaint.h" | 15 #include "SkPaint.h" |
16 | 16 |
17 class GrContext; | 17 class GrContext; |
18 class GrPaint; | |
19 class SkBitmap; | 18 class SkBitmap; |
20 class SkBlitter; | 19 class SkBlitter; |
21 class SkBounder; | 20 class SkBounder; |
22 class SkMatrix; | 21 class SkMatrix; |
23 class SkPath; | 22 class SkPath; |
24 class SkRasterClip; | 23 class SkRasterClip; |
25 class SkRRect; | 24 class SkRRect; |
26 class SkStrokeRec; | |
27 | 25 |
28 /** \class SkMaskFilter | 26 /** \class SkMaskFilter |
29 | 27 |
30 SkMaskFilter is the base class for object that perform transformations on | 28 SkMaskFilter is the base class for object that perform transformations on |
31 an alpha-channel mask before drawing it. A subclass of SkMaskFilter may be | 29 an alpha-channel mask before drawing it. A subclass of SkMaskFilter may be |
32 installed into a SkPaint. Once there, each time a primitive is drawn, it | 30 installed into a SkPaint. Once there, each time a primitive is drawn, it |
33 is first scan converted into a SkMask::kA8_Format mask, and handed to the | 31 is first scan converted into a SkMask::kA8_Format mask, and handed to the |
34 filter, calling its filterMask() method. If this returns true, then the | 32 filter, calling its filterMask() method. If this returns true, then the |
35 new mask is used to render into the device. | 33 new mask is used to render into the device. |
36 | 34 |
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89 * passed into 'filterMaskGPU' should have the same extent as 'maskRect' bu
t be translated | 87 * passed into 'filterMaskGPU' should have the same extent as 'maskRect' bu
t be translated |
90 * to the upper-left corner of the mask (i.e., (maskRect.fLeft, maskRect.fT
op) appears at | 88 * to the upper-left corner of the mask (i.e., (maskRect.fLeft, maskRect.fT
op) appears at |
91 * (0, 0) in the mask). | 89 * (0, 0) in the mask). |
92 */ | 90 */ |
93 virtual bool canFilterMaskGPU(const SkRect& devBounds, | 91 virtual bool canFilterMaskGPU(const SkRect& devBounds, |
94 const SkIRect& clipBounds, | 92 const SkIRect& clipBounds, |
95 const SkMatrix& ctm, | 93 const SkMatrix& ctm, |
96 SkRect* maskRect) const; | 94 SkRect* maskRect) const; |
97 | 95 |
98 /** | 96 /** |
99 * Try to directly render the mask filter into the target. Returns | |
100 * true if drawing was successful. | |
101 */ | |
102 virtual bool directFilterMaskGPU(GrContext* context, | |
103 GrPaint* grp, | |
104 const SkStrokeRec& strokeRec, | |
105 const SkPath& path) const; | |
106 | |
107 /** | |
108 * This function is used to implement filters that require an explicit src m
ask. It should only | 97 * This function is used to implement filters that require an explicit src m
ask. It should only |
109 * be called if canFilterMaskGPU returned true and the maskRect param should
be the output from | 98 * be called if canFilterMaskGPU returned true and the maskRect param should
be the output from |
110 * that call. canOverwriteSrc indicates whether the implementation may treat
src as a scratch | 99 * that call. canOverwriteSrc indicates whether the implementation may treat
src as a scratch |
111 * texture and overwrite its contents. When true it is also legal to return
src as the result. | 100 * texture and overwrite its contents. When true it is also legal to return
src as the result. |
112 * Implementations are free to get the GrContext from the src texture in ord
er to create | 101 * Implementations are free to get the GrContext from the src texture in ord
er to create |
113 * additional textures and perform multiple passes. | 102 * additional textures and perform multiple passes. |
114 */ | 103 */ |
115 virtual bool filterMaskGPU(GrTexture* src, | 104 virtual bool filterMaskGPU(GrTexture* src, |
116 const SkMatrix& ctm, | 105 const SkMatrix& ctm, |
117 const SkRect& maskRect, | 106 const SkRect& maskRect, |
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194 to render that mask. Returns false if filterMask() returned false. | 183 to render that mask. Returns false if filterMask() returned false. |
195 */ | 184 */ |
196 bool filterRRect(const SkRRect& devRRect, const SkMatrix& devMatrix, | 185 bool filterRRect(const SkRRect& devRRect, const SkMatrix& devMatrix, |
197 const SkRasterClip&, SkBounder*, SkBlitter* blitter, | 186 const SkRasterClip&, SkBounder*, SkBlitter* blitter, |
198 SkPaint::Style style) const; | 187 SkPaint::Style style) const; |
199 | 188 |
200 typedef SkFlattenable INHERITED; | 189 typedef SkFlattenable INHERITED; |
201 }; | 190 }; |
202 | 191 |
203 #endif | 192 #endif |
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