YUV and color xforms

src/core/SkColorSpaceXform.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 SkColorSpaceXform_DEFINED
 #define SkColorSpaceXform_DEFINED
 
@@ skipping 23 matching lines @@
      *  @param dstColorType Describes color type of |dst|
      *  @param dstAlphaType Describes alpha type of |dst|
      *                      kUnpremul preserves input alpha values
      *                      kPremul   performs a premultiplication and also preserves alpha values
      *                      kOpaque   optimization hint, |dst| alphas set to 1
      *
      */
     virtual void apply(void* dst, const uint32_t* src, int len, SkColorType dstColorType,
                        SkAlphaType dstAlphaType) const = 0;
 
+    virtual void applyYUV(void* dst, const uint8_t* y, const uint8_t* u, const uint8_t* v, int width) const = 0;
+
     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, SkColorType dstColorType,
                SkAlphaType dstAlphaType) const override;
 
+    void applyYUV(void* dst, const uint8_t* y, const uint8_t* u, const uint8_t* v, int width) const override;
+
     static constexpr int      kDstGammaTableSize = 1024;
 
 private:
     SkColorSpaceXform_Base(const sk_sp<SkColorSpace>& srcSpace, const SkMatrix44& srcToDst,
                            const sk_sp<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(const sk_sp<SkColorSpace>& space);
 };
 
 // For testing.  Bypasses opts for when src and dst color spaces are equal.
 std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(const sk_sp<SkColorSpace>& space);
 
 #endif