Refactored SkColorSpace and added in a Lab PCS GM

src/effects/gradients/SkGradientShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Sk4fLinearGradient.h"
-#include "SkColorSpace_Base.h"
+#include "SkColorSpace_XYZ.h"
 #include "SkGradientShaderPriv.h"
 #include "SkHalf.h"
 #include "SkLinearGradient.h"
 #include "SkRadialGradient.h"
 #include "SkTwoPointConicalGradient.h"
 #include "SkSweepGradient.h"
 
 enum GradientSerializationFlags {
     // Bits 29:31 used for various boolean flags
     kHasPosition_GSF    = 0x80000000,
@@ skipping 1720 matching lines @@
     if (fColorCount == 1 || (fColorCount >= 2 && random->nextBool())) {
         fStops = nullptr;
     } else {
         fStops = fStopStorage;
     }
 
     // if using SkColor4f, attach a random (possibly null) color space (with linear gamma)
     if (fUseColors4f) {
         fColorSpace = GrTest::TestColorSpace(random);
         if (fColorSpace) {
-            fColorSpace = as_CSB(fColorSpace)->makeLinearGamma();
+            SkASSERT(SkColorSpace_Base::Type::kXYZ == as_CSB(fColorSpace)->type());
+            fColorSpace = static_cast<SkColorSpace_XYZ*>(fColorSpace.get())->makeLinearGamma();
         }
     }
 
     SkScalar stop = 0.f;
     for (int i = 0; i < fColorCount; ++i) {
         if (fUseColors4f) {
             fColors4f[i].fR = random->nextUScalar1();
             fColors4f[i].fG = random->nextUScalar1();
             fColors4f[i].fB = random->nextUScalar1();
             fColors4f[i].fA = random->nextUScalar1();
         } else {
             fColors[i] = random->nextU();
         }
         if (fStops) {
             fStops[i] = stop;
             stop = i < fColorCount - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
         }
     }
     fTileMode = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));
 }
 
 #endif