Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/effects/GrDistanceFieldGeoProc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDistanceFieldGeoProc.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
@@ skipping 211 matching lines @@
                                                            const SkMatrix& viewMatrix,
                                                            GrTexture* texture,
                                                            const GrTextureParams& params,
 #ifdef SK_GAMMA_APPLY_TO_A8
                                                            float distanceAdjust,
 #endif
                                                            uint32_t flags,
                                                            bool usesLocalCoords)
     : fColor(color)
     , fViewMatrix(viewMatrix)
-    , fTextureAccess(texture, params)
+    , fTextureAccess(texture, nullptr, params)
 #ifdef SK_GAMMA_APPLY_TO_A8
     , fDistanceAdjust(distanceAdjust)
 #endif
     , fFlags(flags & kNonLCD_DistanceFieldEffectMask)
     , fInColor(nullptr)
     , fUsesLocalCoords(usesLocalCoords) {
     SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask));
     this->initClassID<GrDistanceFieldA8TextGeoProc>();
     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
                                                    kHigh_GrSLPrecision));
@@ skipping 220 matching lines @@
 
 GrDistanceFieldPathGeoProc::GrDistanceFieldPathGeoProc(
         GrColor color,
         const SkMatrix& viewMatrix,
         GrTexture* texture,
         const GrTextureParams& params,
         uint32_t flags,
         bool usesLocalCoords)
     : fColor(color)
     , fViewMatrix(viewMatrix)
-    , fTextureAccess(texture, params)
+    , fTextureAccess(texture, nullptr, params)
     , fFlags(flags & kNonLCD_DistanceFieldEffectMask)
     , fInColor(nullptr)
     , fUsesLocalCoords(usesLocalCoords) {
     SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask));
     this->initClassID<GrDistanceFieldPathGeoProc>();
     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
                                                    kHigh_GrSLPrecision));
     fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType));
     fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords",
                                                         kVec2f_GrVertexAttribType));
@@ skipping 275 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrDistanceFieldLCDTextGeoProc::GrDistanceFieldLCDTextGeoProc(
                                                   GrColor color, const SkMatrix& viewMatrix,
                                                   GrTexture* texture, const GrTextureParams& params,
                                                   DistanceAdjust distanceAdjust,
                                                   uint32_t flags, bool usesLocalCoords)
     : fColor(color)
     , fViewMatrix(viewMatrix)
-    , fTextureAccess(texture, params)
+    , fTextureAccess(texture, nullptr, params)
     , fDistanceAdjust(distanceAdjust)
     , fFlags(flags & kLCD_DistanceFieldEffectMask)
     , fUsesLocalCoords(usesLocalCoords) {
     SkASSERT(!(flags & ~kLCD_DistanceFieldEffectMask) && (flags & kUseLCD_DistanceFieldEffectFlag));
     this->initClassID<GrDistanceFieldLCDTextGeoProc>();
     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
                                                    kHigh_GrSLPrecision));
     fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType));
     fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords",
                                                         kVec2us_GrVertexAttribType,
@@ skipping 35 matching lines @@
         flags |= d->fRandom->nextBool() ? kScaleOnly_DistanceFieldEffectFlag : 0;
     }
     flags |= d->fRandom->nextBool() ? kBGR_DistanceFieldEffectFlag : 0;
     return GrDistanceFieldLCDTextGeoProc::Make(GrRandomColor(d->fRandom),
                                                GrTest::TestMatrix(d->fRandom),
                                                d->fTextures[texIdx], params,
                                                wa,
                                                flags,
                                                d->fRandom->nextBool());
 }