Use a table-based implementation of SkDefaultXform

src/core/SkColorSpace_Base.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkColorSpace_Base_DEFINED
 #define SkColorSpace_Base_DEFINED
 
@@ skipping 63 matching lines @@
         , fTableSize(0)
         , fTable(nullptr)
         , fG(0.0f)
         , fA(0.0f)
         , fB(0.0f)
         , fC(0.0f)
         , fD(0.0f)
         , fE(0.0f)
         , fF(0.0f)
     {}
+
+    bool quickEquals(const SkGammaCurve& that) const {
+        return (this->fNamed == that.fNamed) && (this->fValue == that.fValue) &&
+                (this->fTableSize == that.fTableSize) && (this->fTable == that.fTable) &&
+                (this->fG == that.fG) && (this->fA == that.fA) && (this->fB == that.fB) &&
+                (this->fC == that.fC) && (this->fD == that.fD) && (this->fE == that.fE) &&
+                (this->fF == that.fF);
+    }
 };
 
 struct SkGammas : public SkRefCnt {
 public:
     static SkColorSpace::GammaNamed Named(SkGammaCurve curves[3]) {
         if (SkColorSpace::kLinear_GammaNamed == curves[0].fNamed &&
             SkColorSpace::kLinear_GammaNamed == curves[1].fNamed &&
             SkColorSpace::kLinear_GammaNamed == curves[2].fNamed)
         {
             return SkColorSpace::kLinear_GammaNamed;
         }
 
         if (SkColorSpace::kSRGB_GammaNamed == curves[0].fNamed &&
             SkColorSpace::kSRGB_GammaNamed == curves[1].fNamed &&
             SkColorSpace::kSRGB_GammaNamed == curves[2].fNamed)
         {
             return SkColorSpace::kSRGB_GammaNamed;
         }
 
         if (SkColorSpace::k2Dot2Curve_GammaNamed == curves[0].fNamed &&
             SkColorSpace::k2Dot2Curve_GammaNamed == curves[1].fNamed &&
             SkColorSpace::k2Dot2Curve_GammaNamed == curves[2].fNamed)
         {
             return SkColorSpace::k2Dot2Curve_GammaNamed;
         }
 
         return SkColorSpace::kNonStandard_GammaNamed;
     }
 
-    const SkGammaCurve& operator[](int i) {
+    const SkGammaCurve& operator[](int i) const {
         SkASSERT(0 <= i && i < 3);
         return (&fRed)[i];
     }
 
     const SkGammaCurve fRed;
     const SkGammaCurve fGreen;
     const SkGammaCurve fBlue;
 
     SkGammas(SkGammaCurve red, SkGammaCurve green, SkGammaCurve blue)
         : fRed(std::move(red))
@@ skipping 17 matching lines @@
     SkColorLookUpTable() {
         memset(this, 0, sizeof(struct SkColorLookUpTable));
     }
 };
 
 class SkColorSpace_Base : public SkColorSpace {
 public:
 
     static sk_sp<SkColorSpace> NewRGB(float gammas[3], const SkMatrix44& toXYZD50);
 
-    const sk_sp<SkGammas>& gammas() const { return fGammas; }
+    const SkGammas* gammas() const { return fGammas.get(); }
 
-    SkColorLookUpTable* colorLUT() const { return fColorLUT.get(); }
+    const SkColorLookUpTable* colorLUT() const { return fColorLUT.get(); }
 
     /**
      *  Writes this object as an ICC profile.
      */
     sk_sp<SkData> writeToICC() const;
 
 private:
 
     static sk_sp<SkColorSpace> NewRGB(GammaNamed gammaNamed, const SkMatrix44& toXYZD50,
                                       sk_sp<SkData> profileData);
 
     SkColorSpace_Base(GammaNamed gammaNamed, const SkMatrix44& toXYZ, Named named,
                       sk_sp<SkData> profileData);
 
     SkColorSpace_Base(SkColorLookUpTable* colorLUT, sk_sp<SkGammas> gammas, const SkMatrix44& toXYZ,
                       sk_sp<SkData> profileData);
 
     SkAutoTDelete<SkColorLookUpTable> fColorLUT;
     sk_sp<SkGammas>                   fGammas;
     sk_sp<SkData>                     fProfileData;
 
     friend class SkColorSpace;
+    friend class ColorSpaceXformTest;
     typedef SkColorSpace INHERITED;
 };
 
 static inline SkColorSpace_Base* as_CSB(SkColorSpace* colorSpace) {
     return static_cast<SkColorSpace_Base*>(colorSpace);
 }
 
 static inline const SkColorSpace_Base* as_CSB(const SkColorSpace* colorSpace) {
     return static_cast<const SkColorSpace_Base*>(colorSpace);
 }
 
 static inline SkColorSpace_Base* as_CSB(const sk_sp<SkColorSpace>& colorSpace) {
     return static_cast<SkColorSpace_Base*>(colorSpace.get());
 }
 
 #endif