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

src/effects/gradients/SkGradientShaderPriv.h

Index: src/effects/gradients/SkGradientShaderPriv.h
diff --git a/src/effects/gradients/SkGradientShaderPriv.h b/src/effects/gradients/SkGradientShaderPriv.h
index aeb1301c7f5b6725f30de62ecf215b52aed74cd1..9df24d2d7994bf7f877231fca0d0539b2a3c914a 100644
--- a/src/effects/gradients/SkGradientShaderPriv.h
+++ b/src/effects/gradients/SkGradientShaderPriv.h
@@ -175,7 +175,13 @@ public:
 
     bool isOpaque() const override;
 
-    void getGradientTableBitmap(SkBitmap*) const;
+    enum class GradientBitmapType : uint8_t {
+        kLegacy = 0,
+        kSRGB = 1,
+        kHalfFloat = 2,

[f(malita), 2016/09/21 02:51:35]

nit: do we actually care about these values being explicit?

[Brian Osman, 2016/09/21 13:24:18]

Nope. Fixed.

+    };
+
+    void getGradientTableBitmap(SkBitmap*, GradientBitmapType bitmapType) const;
 
     enum {
         /// Seems like enough for visual accuracy. TODO: if pos[] deserves
@@ -214,6 +220,9 @@ protected:
 
     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
@@ -490,6 +499,7 @@ private:
     SkScalar fCachedYCoord;
     GrGLSLProgramDataManager::UniformHandle fColorsUni;
     GrGLSLProgramDataManager::UniformHandle fFSYUni;
+    GrGLSLProgramDataManager::UniformHandle fColorSpaceXformUni;
 
     typedef GrGLSLFragmentProcessor INHERITED;
 };