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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
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 GrXferProcessor_DEFINED | 8 #ifndef GrXferProcessor_DEFINED |
9 #define GrXferProcessor_DEFINED | 9 #define GrXferProcessor_DEFINED |
10 | 10 |
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173 * fractional pixel coverage generated by the fragment shader. | 173 * fractional pixel coverage generated by the fragment shader. |
174 * | 174 * |
175 * This function considers the known color and coverage input into the xfer
processor and | 175 * This function considers the known color and coverage input into the xfer
processor and |
176 * certain state information (colorWriteDisabled) to determine whether | 176 * certain state information (colorWriteDisabled) to determine whether |
177 * coverage can be handled correctly. | 177 * coverage can be handled correctly. |
178 */ | 178 */ |
179 // TODO: remove need for colorWriteDisabled once colorWriteDisabled is its o
wn XP. | 179 // TODO: remove need for colorWriteDisabled once colorWriteDisabled is its o
wn XP. |
180 virtual bool canApplyCoverage(const GrProcOptInfo& colorPOI, const GrProcOpt
Info& coveragePOI, | 180 virtual bool canApplyCoverage(const GrProcOptInfo& colorPOI, const GrProcOpt
Info& coveragePOI, |
181 bool colorWriteDisabled) const = 0; | 181 bool colorWriteDisabled) const = 0; |
182 | 182 |
183 /** | 183 |
184 * This function returns true if the destination pixel values will be read f
or blending during | 184 struct InvariantOutput { |
185 * draw. | 185 bool fWillBlendWithDst; |
| 186 GrColor fBlendedColor; |
| 187 uint32_t fBlendedColorFlags; |
| 188 }; |
| 189 |
| 190 /** |
| 191 * This function returns known information about the output of the xfer proc
essor produced by |
| 192 * this xp factory. The invariant color information returned by this functio
n refers to the |
| 193 * final color produced after all blending. |
186 */ | 194 */ |
187 // TODO: remove need for colorWriteDisabled once only XP can read dst. | 195 // TODO: remove need for colorWriteDisabled once only XP can read dst. |
188 virtual bool willBlendWithDst(const GrProcOptInfo& colorPOI, const GrProcOpt
Info& coveragePOI, | 196 virtual void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcO
ptInfo& coveragePOI, |
189 bool colorWriteDisabled) const = 0; | 197 bool colorWriteDisabled, InvariantOutput*) c
onst = 0; |
190 | 198 |
191 /** | 199 /** |
192 * Determines whether multiplying the computed per-pixel color by the pixel'
s fractional | 200 * Determines whether multiplying the computed per-pixel color by the pixel'
s fractional |
193 * coverage before the blend will give the correct final destination color.
In general it | 201 * coverage before the blend will give the correct final destination color.
In general it |
194 * will not as coverage is applied after blending. | 202 * will not as coverage is applied after blending. |
195 */ | 203 */ |
196 virtual bool canTweakAlphaForCoverage() const = 0; | 204 virtual bool canTweakAlphaForCoverage() const = 0; |
197 | 205 |
198 virtual bool getOpaqueAndKnownColor(const GrProcOptInfo& colorPOI, | |
199 const GrProcOptInfo& coveragePOI, GrColo
r* solidColor, | |
200 uint32_t* solidColorKnownComponents) con
st = 0; | |
201 | |
202 bool isEqual(const GrXPFactory& that) const { | 206 bool isEqual(const GrXPFactory& that) const { |
203 if (this->classID() != that.classID()) { | 207 if (this->classID() != that.classID()) { |
204 return false; | 208 return false; |
205 } | 209 } |
206 return this->onIsEqual(that); | 210 return this->onIsEqual(that); |
207 } | 211 } |
208 | 212 |
209 /** | 213 /** |
210 * Helper for down-casting to a GrXPFactory subclass | 214 * Helper for down-casting to a GrXPFactory subclass |
211 */ | 215 */ |
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241 enum { | 245 enum { |
242 kIllegalXPFClassID = 0, | 246 kIllegalXPFClassID = 0, |
243 }; | 247 }; |
244 static int32_t gCurrXPFClassID; | 248 static int32_t gCurrXPFClassID; |
245 | 249 |
246 typedef GrProgramElement INHERITED; | 250 typedef GrProgramElement INHERITED; |
247 }; | 251 }; |
248 | 252 |
249 #endif | 253 #endif |
250 | 254 |
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