Revert of Introduce SkGammas type to represent ICC gamma curves

src/core/SkColorSpace.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_DEFINED
 #define SkColorSpace_DEFINED
 
@@ skipping 17 matching lines @@
 
     void dump() const;
 };
 
 struct SkFloat3x3 {
     float fMat[9];
 
     void dump() const;
 };
 
+struct SkColorLookUpTable {
+    static const uint8_t kMaxChannels = 16;
+
+    uint8_t                  fInputChannels;
+    uint8_t                  fOutputChannels;
+    uint8_t                  fGridPoints[kMaxChannels];
+    std::unique_ptr<float[]> fTable;
+
+    SkColorLookUpTable() {
+        memset(this, 0, sizeof(struct SkColorLookUpTable));
+    }
+
+    SkColorLookUpTable(SkColorLookUpTable&& that)
+        : fInputChannels(that.fInputChannels)
+        , fOutputChannels(that.fOutputChannels)
+        , fTable(std::move(that.fTable))
+    {
+        memcpy(fGridPoints, that.fGridPoints, kMaxChannels);
+    }
+};
+
 class SkColorSpace : public SkRefCnt {
-private:
-    struct SkGammaCurve {
-        bool isValue() const {
-            bool result = (0.0f != fValue);
-            SkASSERT(!result || (0 == fTableSize));
-            return result;
-        }
-
-        bool isTable() const {
-            bool result = (0 != fTableSize);
-            SkASSERT(!result || (0.0f == fValue));
-            SkASSERT(!result || fTable);
-            return result;
-        }
-
-        bool isParametric() const { return false; }
-
-        // We have three different ways to represent gamma.
-        // (1) A single value:
-        float                    fValue;
-
-        // (2) A lookup table:
-        uint32_t                 fTableSize;
-        std::unique_ptr<float[]> fTable;
-
-        // (3) Parameters for a curve:
-        // FIXME (msarett): Handle parametric curves.
-
-        SkGammaCurve() {
-            memset(this, 0, sizeof(struct SkGammaCurve));
-        }
-
-        SkGammaCurve(float value)
-            : fValue(value)
-            , fTableSize(0)
-            , fTable(nullptr)
-        {}
-    };
-
-    struct SkColorLookUpTable {
-        static const uint8_t kMaxChannels = 16;
-
-        uint8_t                  fInputChannels;
-        uint8_t                  fOutputChannels;
-        uint8_t                  fGridPoints[kMaxChannels];
-        std::unique_ptr<float[]> fTable;
-
-        SkColorLookUpTable() {
-            memset(this, 0, sizeof(struct SkColorLookUpTable));
-        }
-    };
-
 public:
     enum Named {
         kUnknown_Named,
         kSRGB_Named,
     };
 
-    struct SkGammas {
-    public:
-        SkGammas(float red, float green, float blue)
-            : fRed(red)
-            , fGreen(green)
-            , fBlue(blue)
-        {}
-
-        SkGammas() {}
-
-        SkDEBUGCODE(float red() const { return fRed.fValue; })
-        SkDEBUGCODE(float green() const { return fGreen.fValue; })
-        SkDEBUGCODE(float blue() const { return fBlue.fValue; })
-
-    private:
-        SkGammaCurve fRed;
-        SkGammaCurve fGreen;
-        SkGammaCurve fBlue;
-
-        friend class SkColorSpace;
-    };
-
     /**
      *  Return a colorspace instance, given a 3x3 transform from linear_RGB to D50_XYZ
      *  and the src-gamma, return a ColorSpace
      */
-    static sk_sp<SkColorSpace> NewRGB(const SkFloat3x3& toXYZD50, SkGammas gammas);
+    static sk_sp<SkColorSpace> NewRGB(const SkFloat3x3& toXYZD50, const SkFloat3& gamma);
 
     static sk_sp<SkColorSpace> NewNamed(Named);
     static sk_sp<SkColorSpace> NewICC(const void*, size_t);
 
-    const SkGammas& gammas() const { return fGammas; }
+    SkFloat3 gamma() const { return fGamma; }
     SkFloat3x3 xyz() const { return fToXYZD50; }
     SkFloat3 xyzOffset() const { return fToXYZOffset; }
     Named named() const { return fNamed; }
     uint32_t uniqueID() const { return fUniqueID; }
 
 private:
+    SkColorSpace(const SkFloat3& gamma, const SkFloat3x3& toXYZ, Named);
 
-    static bool LoadGammas(SkGammaCurve* gammas, uint32_t num, const uint8_t* src, size_t len);
-
-
-    static bool LoadColorLUT(SkColorLookUpTable* colorLUT, uint32_t inputChannels,
-                             uint32_t outputChannels, const uint8_t* src, size_t len);
-
-
-    static bool LoadA2B0(SkColorLookUpTable* colorLUT, SkGammas* gammas, SkFloat3x3* toXYZ,
-                         SkFloat3* toXYZOffset, const uint8_t* src, size_t len);
-
-    SkColorSpace(SkGammas gammas, const SkFloat3x3& toXYZ, Named);
-
-    SkColorSpace(SkColorLookUpTable colorLUT, SkGammas gammas,
-                 const SkFloat3x3& toXYZ, const SkFloat3& toXYZOffset);
+    SkColorSpace(SkColorLookUpTable colorLUT, const SkFloat3& gamma, const SkFloat3x3& toXYZ,
+                 const SkFloat3& toXYZOffset);
 
     const SkColorLookUpTable fColorLUT;
-    const SkGammas           fGammas;
+    const SkFloat3           fGamma;
     const SkFloat3x3         fToXYZD50;
     const SkFloat3           fToXYZOffset;
 
     const uint32_t           fUniqueID;
     const Named              fNamed;
 };
 
 #endif