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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 SkXfermode_DEFINED | 10 #ifndef SkXfermode_DEFINED |
11 #define SkXfermode_DEFINED | 11 #define SkXfermode_DEFINED |
12 | 12 |
13 #include "SkFlattenable.h" | 13 #include "SkFlattenable.h" |
14 #include "SkColor.h" | 14 #include "SkColor.h" |
15 | 15 |
16 class GrFragmentProcessor; | 16 class GrFragmentProcessor; |
17 class GrProcessorDataManager; | |
18 class GrTexture; | 17 class GrTexture; |
19 class GrXPFactory; | 18 class GrXPFactory; |
20 class SkString; | 19 class SkString; |
21 | 20 |
22 /** \class SkXfermode | 21 /** \class SkXfermode |
23 * | 22 * |
24 * SkXfermode is the base class for objects that are called to implement custom | 23 * SkXfermode is the base class for objects that are called to implement custom |
25 * "transfer-modes" in the drawing pipeline. The static function Create(Modes) | 24 * "transfer-modes" in the drawing pipeline. The static function Create(Modes) |
26 * can be called to return an instance of any of the predefined subclasses as | 25 * can be called to return an instance of any of the predefined subclasses as |
27 * specified in the Modes enum. When an SkXfermode is assigned to an SkPaint, | 26 * specified in the Modes enum. When an SkXfermode is assigned to an SkPaint, |
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194 */ | 193 */ |
195 static bool IsOpaque(const SkXfermode* xfer, SrcColorOpacity opacityType); | 194 static bool IsOpaque(const SkXfermode* xfer, SrcColorOpacity opacityType); |
196 | 195 |
197 /** Used to do in-shader blending between two colors computed in the shader
via a | 196 /** Used to do in-shader blending between two colors computed in the shader
via a |
198 GrFragmentProcessor. The input to the returned FP is the src color. The
dst color is | 197 GrFragmentProcessor. The input to the returned FP is the src color. The
dst color is |
199 provided by the dst param which becomes a child FP of the returned FP. I
f the params are | 198 provided by the dst param which becomes a child FP of the returned FP. I
f the params are |
200 null then this is just a query of whether the SkXfermode could support t
his functionality. | 199 null then this is just a query of whether the SkXfermode could support t
his functionality. |
201 It is legal for the function to succeed but return a null output. This i
ndicates that | 200 It is legal for the function to succeed but return a null output. This i
ndicates that |
202 the output of the blend is simply the src color. | 201 the output of the blend is simply the src color. |
203 */ | 202 */ |
204 virtual bool asFragmentProcessor(const GrFragmentProcessor** output, GrProce
ssorDataManager*, | 203 virtual bool asFragmentProcessor(const GrFragmentProcessor** output, |
205 const GrFragmentProcessor* dst) const; | 204 const GrFragmentProcessor* dst) const; |
206 | 205 |
207 /** A subclass may implement this factory function to work with the GPU back
end. It is legal | 206 /** A subclass may implement this factory function to work with the GPU back
end. It is legal |
208 to call this with xpf NULL to simply test the return value. If xpf is no
n-NULL then the | 207 to call this with xpf NULL to simply test the return value. If xpf is no
n-NULL then the |
209 xfermode may optionally allocate a factory to return to the caller as *x
pf. The caller | 208 xfermode may optionally allocate a factory to return to the caller as *x
pf. The caller |
210 will install it and own a ref to it. Since the xfermode may or may not a
ssign *xpf, the | 209 will install it and own a ref to it. Since the xfermode may or may not a
ssign *xpf, the |
211 caller should set *xpf to NULL beforehand. XferProcessors cannot use a b
ackground texture. | 210 caller should set *xpf to NULL beforehand. XferProcessors cannot use a b
ackground texture. |
212 */ | 211 */ |
213 virtual bool asXPFactory(GrXPFactory** xpf) const; | 212 virtual bool asXPFactory(GrXPFactory** xpf) const; |
214 | 213 |
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236 | 235 |
237 private: | 236 private: |
238 enum { | 237 enum { |
239 kModeCount = kLastMode + 1 | 238 kModeCount = kLastMode + 1 |
240 }; | 239 }; |
241 | 240 |
242 typedef SkFlattenable INHERITED; | 241 typedef SkFlattenable INHERITED; |
243 }; | 242 }; |
244 | 243 |
245 #endif | 244 #endif |
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