Add SkColorSpaceXform to the public API

include/core/SkColorSpaceXform.h

Index: include/core/SkColorSpaceXform.h
diff --git a/src/core/SkColorSpaceXform.h b/include/core/SkColorSpaceXform.h
similarity index 56%
rename from src/core/SkColorSpaceXform.h
rename to include/core/SkColorSpaceXform.h
index bb99071fe03388057c63e30327ca95bdb6ba23b5..1f53886860909e7332e2d68f7e9d1d61e0f133b9 100644
--- a/src/core/SkColorSpaceXform.h
+++ b/include/core/SkColorSpaceXform.h
@@ -8,10 +8,10 @@
 #ifndef SkColorSpaceXform_DEFINED
 #define SkColorSpaceXform_DEFINED
 
-#include "SkColorSpace.h"
-#include "SkColorSpace_Base.h"
 #include "SkImageInfo.h"
 
+class SkColorSpace;
+
 class SkColorSpaceXform : SkNoncopyable {
 public:
 
@@ -34,6 +34,9 @@ public:
     /**
      *  Apply the color conversion to a |src| buffer, storing the output in the |dst| buffer.
      *
+     *  F16 and F32 are only supported as dst color formats, and only when the dst color space
+     *  is linear.  This function will assert on invalid or unsupported uses.
+     *
      *  @param dst            Stored in the format described by |dstColorFormat|
      *  @param src            Stored in the format described by |srcColorFormat|
      *  @param len            Number of pixels in the buffers
@@ -52,51 +55,4 @@ public:
     virtual ~SkColorSpaceXform() {}
 };
 
-enum SrcGamma {
-    kLinear_SrcGamma,
-    kTable_SrcGamma,
-};
-
-enum DstGamma {
-    kLinear_DstGamma,
-    kSRGB_DstGamma,
-    k2Dot2_DstGamma,
-    kTable_DstGamma,
-};
-
-enum ColorSpaceMatch {
-    kNone_ColorSpaceMatch,
-    kGamut_ColorSpaceMatch,
-    kFull_ColorSpaceMatch,
-};
-
-template <SrcGamma kSrc, DstGamma kDst, ColorSpaceMatch kCSM>
-class SkColorSpaceXform_Base : public SkColorSpaceXform {
-public:
-
-    void apply(void* dst, const uint32_t* src, int len, ColorFormat dstColorFormat,
-               ColorFormat srcColorFormat, SkAlphaType alphaType) const override;
-
-    static constexpr int      kDstGammaTableSize = 1024;
-
-private:
-    SkColorSpaceXform_Base(SkColorSpace* srcSpace, const SkMatrix44& srcToDst,
-                           SkColorSpace* dstSpace);
-
-    sk_sp<SkColorLookUpTable> fColorLUT;
-
-    // Contain pointers into storage or pointers into precomputed tables.
-    const float*              fSrcGammaTables[3];
-    const uint8_t*            fDstGammaTables[3];
-    SkAutoMalloc              fStorage;
-
-    float                     fSrcToDst[16];
-
-    friend class SkColorSpaceXform;
-    friend std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace* space);
-};
-
-// For testing.  Bypasses opts for when src and dst color spaces are equal.
-std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace* space);
-
 #endif