New helper for creating a color space from another, with linear gamma

src/core/SkColorSpace.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorSpace.h"
 #include "SkColorSpace_Base.h"
 #include "SkColorSpacePriv.h"
@@ skipping 137 matching lines @@
                                                      kAdobeRGB_Named));
             });
             return adobeRGB;
         }
         default:
             break;
     }
     return nullptr;
 }
 
+sk_sp<SkColorSpace> SkColorSpace::makeLinearGamma() {
+    return SkColorSpace_Base::NewRGB(kLinear_GammaNamed, fToXYZD50);

[msarett, 2016/08/23 18:01:12]

Eventually we'll want to add once-ptrs for the common cases of this...

+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 enum Version {
     k0_Version, // Initial version, header + flags for matrix and profile
 };
 
 struct ColorSpaceHeader {
     /**
      *  If kMatrix_Flag is set, we will write 12 floats after the header.
      *  Should not be set at the same time as the kICC_Flag or kFloatGamma_Flag.
@@ skipping 277 matching lines @@
            gammas->fBlueType == SkGammas::Type::kTable_Type;
 }
 
 bool SkColorSpace::gammasAreParams() const {
     const SkGammas* gammas = as_CSB(this)->gammas();
     SkASSERT(gammas);
     return gammas->fRedType == SkGammas::Type::kParam_Type &&
            gammas->fGreenType == SkGammas::Type::kParam_Type &&
            gammas->fBlueType == SkGammas::Type::kParam_Type;
 }