Make SkColorSpace a public API

src/core/SkColorSpacePriv.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 SkColorSpacePriv_DEFINED
-#define SkColorSpacePriv_DEFINED
-
-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 SkGammas : public SkRefCnt {
-public:
-    bool isValues() const {
-        return fRed.isValue() && fGreen.isValue() && fBlue.isValue();
-    }
-
-    const SkGammaCurve fRed;
-    const SkGammaCurve fGreen;
-    const SkGammaCurve fBlue;
-
-    SkGammas(float red, float green, float blue)
-        : fRed(red)
-        , fGreen(green)
-        , fBlue(blue)
-    {}
-
-    SkGammas(SkGammaCurve red, SkGammaCurve green, SkGammaCurve blue)
-        : fRed(std::move(red))
-        , fGreen(std::move(green))
-        , fBlue(std::move(blue))
-    {}
-
-    SkGammas() {}
-
-    friend class SkColorSpace;
-};
-
-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));
-    }
-};
-
-#endif