Line data    Source code

       1             : /*
       2             :  * Copyright 2016 Google Inc.
       3             :  *
       4             :  * Use of this source code is governed by a BSD-style license that can be
       5             :  * found in the LICENSE file.
       6             :  */
       7             : 
       8             : #ifndef SkColorSpaceXform_Base_DEFINED
       9             : #define SkColorSpaceXform_Base_DEFINED
      10             : 
      11             : #include "SkColorSpace.h"
      12             : #include "SkColorSpace_Base.h"
      13             : #include "SkColorSpaceXform.h"
      14             : #include "SkResourceCache.h"
      15             : 
      16             : class SkColorSpace_XYZ;
      17             : 
      18           0 : class SkColorSpaceXform_Base : public SkColorSpaceXform {
      19             : public:
      20             :     static constexpr int kDstGammaTableSize = 1024;
      21             : 
      22             :     static std::unique_ptr<SkColorSpaceXform> New(SkColorSpace* srcSpace, SkColorSpace* dstSpace,
      23             :                                                   SkTransferFunctionBehavior premulBehavior);
      24             : 
      25             : protected:
      26             :     virtual bool onApply(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src,
      27             :                          int count, SkAlphaType alphaType) const = 0;
      28             : 
      29             : private:
      30             :     static void BuildDstGammaTables(const uint8_t* outGammaTables[3], uint8_t* gammaTableStorage,
      31             :                                     const SkColorSpace_XYZ* space, bool gammasAreMatching);
      32             : 
      33             :     friend class SkColorSpaceXform;
      34             :     friend class SkColorSpace_XYZ;
      35             : };
      36             : 
      37             : enum SrcGamma {
      38             :     kLinear_SrcGamma,
      39             :     kTable_SrcGamma,
      40             :     kSRGB_SrcGamma,
      41             : };
      42             : 
      43             : enum DstGamma {
      44             :     kLinear_DstGamma,
      45             :     kSRGB_DstGamma,
      46             :     k2Dot2_DstGamma,
      47             :     kTable_DstGamma,
      48             : };
      49             : 
      50             : enum ColorSpaceMatch {
      51             :     kNone_ColorSpaceMatch,
      52             :     kGamut_ColorSpaceMatch,
      53             :     kFull_ColorSpaceMatch,
      54             : };
      55             : 
      56             : template <ColorSpaceMatch kCSM>
      57           0 : class SkColorSpaceXform_XYZ : public SkColorSpaceXform_Base {
      58             : protected:
      59             :     bool onApply(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src,
      60             :                  int count, SkAlphaType alphaType) const override;
      61             : 
      62             : private:
      63             :     bool applyPipeline(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src,
      64             :                        int count, SkAlphaType alphaType) const;
      65             : 
      66             :     SkColorSpaceXform_XYZ(SkColorSpace_XYZ* srcSpace, const SkMatrix44& srcToDst,
      67             :                           SkColorSpace_XYZ* dstSpace, SkTransferFunctionBehavior premulBehavior);
      68             : 
      69             :     // Contain pointers into storage or pointers into precomputed tables.
      70             :     const float*               fSrcGammaTables[3];
      71             :     SkAutoTMalloc<float>       fSrcStorage;
      72             :     const uint8_t*             fDstGammaTables[3];
      73             :     sk_sp<SkData>              fDstStorage;
      74             : 
      75             :     // Holds a 3x4 matrix.  Padding is useful for vector loading.
      76             :     float                      fSrcToDst[13];
      77             : 
      78             :     SrcGamma                   fSrcGamma;
      79             :     DstGamma                   fDstGamma;
      80             :     SkTransferFunctionBehavior fPremulBehavior;
      81             : 
      82             :     friend class SkColorSpaceXform_Base;
      83             :     friend std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace_XYZ* space);
      84             : };
      85             : 
      86             : struct LoadTablesContext {
      87             :     const void*  fSrc;
      88             :     const float* fR;
      89             :     const float* fG;
      90             :     const float* fB;
      91             : };
      92             : 
      93             : // Must be kept in sync with "Tables" struct in RasterPipeline_opts byte_tables_rgb.
      94             : struct TablesContext {
      95             :     const uint8_t* fR;
      96             :     const uint8_t* fG;
      97             :     const uint8_t* fB;
      98             :     int            fCount;
      99             : };
     100             : 
     101             : // For testing.  Bypasses opts for when src and dst color spaces are equal.
     102             : std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace_XYZ* space);
     103             : 
     104             : #endif