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_DEFINED
       9             : #define SkColorSpaceXform_DEFINED
      10             : 
      11             : #include "SkImageInfo.h"
      12             : 
      13             : class SkColorSpace;
      14             : 
      15             : class SK_API SkColorSpaceXform : SkNoncopyable {
      16             : public:
      17             : 
      18             :     /**
      19             :      *  Create an object to handle color space conversions.
      20             :      *
      21             :      *  @param srcSpace The encoded color space.
      22             :      *  @param dstSpace The destination color space.
      23             :      *
      24             :      */
      25             :     static std::unique_ptr<SkColorSpaceXform> New(SkColorSpace* srcSpace, SkColorSpace* dstSpace);
      26             : 
      27             :     enum ColorFormat {
      28             :         kRGBA_8888_ColorFormat,
      29             :         kBGRA_8888_ColorFormat,
      30             : 
      31             :         // Unsigned, big-endian, 16-bit integer
      32             :         kRGB_U16_BE_ColorFormat,   // Src only
      33             :         kRGBA_U16_BE_ColorFormat,  // Src only
      34             : 
      35             :         kRGBA_F16_ColorFormat,
      36             :         kRGBA_F32_ColorFormat,
      37             : 
      38             :         kBGR_565_ColorFormat,      // Dst only, kOpaque only
      39             :     };
      40             : 
      41             :     /**
      42             :      *  Apply the color conversion to a |src| buffer, storing the output in the |dst| buffer.
      43             :      *
      44             :      *  F16 and F32 are only supported when the color space is linear. This function will return
      45             :      *  false in unsupported cases.
      46             :      *
      47             :      *  @param dst            Stored in the format described by |dstColorFormat|
      48             :      *  @param src            Stored in the format described by |srcColorFormat|
      49             :      *  @param len            Number of pixels in the buffers
      50             :      *  @param dstColorFormat Describes color format of |dst|
      51             :      *  @param srcColorFormat Describes color format of |src|
      52             :      *  @param alphaType      Describes alpha properties of the |dst| (and |src|)
      53             :      *                        kUnpremul preserves input alpha values
      54             :      *                        kPremul   performs a premultiplication and also preserves alpha values
      55             :      *                        kOpaque   optimization hint, |dst| alphas set to 1
      56             :      *
      57             :      */
      58             :     bool apply(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src, int count,
      59             :                SkAlphaType alphaType) const;
      60             : 
      61           0 :     virtual ~SkColorSpaceXform() {}
      62             : 
      63             : protected:
      64           0 :     SkColorSpaceXform() {}
      65             : };
      66             : 
      67             : #endif