Gamma sanity checks

src/core/SkColorSpace_Base.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 SkColorSpace_Base_DEFINED
 #define SkColorSpace_Base_DEFINED
 
 #include "SkColorSpace.h"
 #include "SkData.h"
 #include "SkTemplates.h"
 
 struct SkGammaCurve {
     bool isValue() const {
         bool result = (0.0f != fValue);
         SkASSERT(!result || (0 == fTableSize));
-        SkASSERT(!result || (0.0f == fG));
+        SkASSERT(!result || (0.0f == fG && 0.0f == fE));
         return result;
     }
 
     bool isTable() const {
         bool result = (0 != fTableSize);
         SkASSERT(!result || (0.0f == fValue));
-        SkASSERT(!result || (0.0f == fG));
+        SkASSERT(!result || (0.0f == fG && 0.0f == fE));
         SkASSERT(!result || fTable);
         return result;
     }
 
     bool isParametric() const {
-        bool result = (0.0f != fG);
+        bool result = (0.0f != fG || 0.0f != fE);
         SkASSERT(!result || (0.0f == fValue));
         SkASSERT(!result || (0 == fTableSize));
         return result;
     }
 
     // We have three different ways to represent gamma.
     // (1) A single value:
     float                    fValue;
 
     // (2) A lookup table:
@@ skipping 107 matching lines @@
 
 static inline const SkColorSpace_Base* as_CSB(const SkColorSpace* colorSpace) {
     return static_cast<const SkColorSpace_Base*>(colorSpace);
 }
 
 static inline SkColorSpace_Base* as_CSB(const sk_sp<SkColorSpace>& colorSpace) {
     return static_cast<SkColorSpace_Base*>(colorSpace.get());
 }
 
 #endif