Support for color-spaces with multi-stop (texture) gradients

src/effects/gradients/SkGradientShaderPriv.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGradientShaderPriv_DEFINED
 #define SkGradientShaderPriv_DEFINED
 
@@ skipping 157 matching lines @@
         bool        fDither;
 
         SkAutoTUnref<GradientShaderCache> fCache;
 
     private:
         typedef SkShader::Context INHERITED;
     };
 
     bool isOpaque() const override;
 
-    void getGradientTableBitmap(SkBitmap*) const;
+    enum class GradientBitmapType : uint8_t {
+        kLegacy,
+        kSRGB,
+        kHalfFloat,
+    };
+
+    void getGradientTableBitmap(SkBitmap*, GradientBitmapType bitmapType) const;
 
     enum {
         /// Seems like enough for visual accuracy. TODO: if pos[] deserves
         /// it, use a larger cache.
         kCache32Bits    = 8,
         kCache32Count   = (1 << kCache32Bits),
         kCache32Shift   = 16 - kCache32Bits,
         kSqrt32Shift    = 8 - kCache32Bits,
 
         /// This value is used to *read* the dither cache; it may be 0
@@ skipping 18 matching lines @@
     struct Rec {
         SkFixed     fPos;   // 0...1
         uint32_t    fScale; // (1 << 24) / range
     };
     Rec*        fRecs;
 
     void commonAsAGradient(GradientInfo*, bool flipGrad = false) const;
 
     bool onAsLuminanceColor(SkColor*) const override;
 
+
+    void initLinearBitmap(SkBitmap* bitmap) const;
+
     /*
      * Takes in pointers to gradient color and Rec info as colorSrc and recSrc respectively.
      * Count is the number of colors in the gradient
      * It will then flip all the color and rec information and return in their respective Dst
      * pointers. It is assumed that space has already been allocated for the Dst pointers.
      * The rec src and dst are only assumed to be valid if count > 2
      */
     static void FlipGradientColors(SkColor* colorDst, Rec* recDst,
                                    SkColor* colorSrc, Rec* recSrc,
                                    int count);
@@ skipping 256 matching lines @@
         kMirrorTileMode         = 48,
 
         // Lower six bits for premul, 2/3 color type, and tile mode
         kReservedBits           = 6,
 #endif
     };
 
     SkScalar fCachedYCoord;
     GrGLSLProgramDataManager::UniformHandle fColorsUni;
     GrGLSLProgramDataManager::UniformHandle fFSYUni;
+    GrGLSLProgramDataManager::UniformHandle fColorSpaceXformUni;
 
     typedef GrGLSLFragmentProcessor INHERITED;
 };
 
 #endif
 
 #endif