Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/effects/GrSimpleTextureEffect.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSimpleTextureEffect_DEFINED
 #define GrSimpleTextureEffect_DEFINED
 
 #include "GrSingleTextureEffect.h"
 
 class GrInvariantOutput;
 
 /**
  * The output color of this effect is a modulation of the input color and a sample from a texture.
  * It allows explicit specification of the filtering and wrap modes (GrTextureParams). It can use
  * local coords or device space coords as input texture coords. The input coords may be transformed
  * by a matrix.
  */
 class GrSimpleTextureEffect : public GrSingleTextureEffect {
 public:
     /* unfiltered, clamp mode */
     static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
+                                           sk_sp<GrColorSpaceXform> colorSpaceXform,
                                            const SkMatrix& matrix,
                                            GrCoordSet coordSet = kLocal_GrCoordSet) {
         return sk_sp<GrFragmentProcessor>(
-            new GrSimpleTextureEffect(tex, matrix, GrTextureParams::kNone_FilterMode, coordSet));
+            new GrSimpleTextureEffect(tex, std::move(colorSpaceXform), matrix,
+                                      GrTextureParams::kNone_FilterMode, coordSet));
     }
 
     /* clamp mode */
     static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
+                                           sk_sp<GrColorSpaceXform> colorSpaceXform,
                                             const SkMatrix& matrix,
                                             GrTextureParams::FilterMode filterMode,
                                             GrCoordSet coordSet = kLocal_GrCoordSet) {
         return sk_sp<GrFragmentProcessor>(
-            new GrSimpleTextureEffect(tex, matrix, filterMode, coordSet));
+            new GrSimpleTextureEffect(tex, std::move(colorSpaceXform), matrix, filterMode,
+                                      coordSet));
     }
 
     static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
+                                           sk_sp<GrColorSpaceXform> colorSpaceXform,
                                            const SkMatrix& matrix,
                                            const GrTextureParams& p,
                                            GrCoordSet coordSet = kLocal_GrCoordSet) {
-        return sk_sp<GrFragmentProcessor>(new GrSimpleTextureEffect(tex, matrix, p, coordSet));
+        return sk_sp<GrFragmentProcessor>(new GrSimpleTextureEffect(tex, std::move(colorSpaceXform),
+                                                                    matrix, p, coordSet));
     }
 
     virtual ~GrSimpleTextureEffect() {}
 
     const char* name() const override { return "SimpleTexture"; }
 
 private:
     GrSimpleTextureEffect(GrTexture* texture,
+                          sk_sp<GrColorSpaceXform> colorSpaceXform,
                           const SkMatrix& matrix,
                           GrTextureParams::FilterMode filterMode,
                           GrCoordSet coordSet)
-        : GrSingleTextureEffect(texture, matrix, filterMode, coordSet) {
+        : GrSingleTextureEffect(texture, std::move(colorSpaceXform), matrix, filterMode, coordSet) {
         this->initClassID<GrSimpleTextureEffect>();
     }
 
     GrSimpleTextureEffect(GrTexture* texture,
+                          sk_sp<GrColorSpaceXform> colorSpaceXform,
                           const SkMatrix& matrix,
                           const GrTextureParams& params,
                           GrCoordSet coordSet)
-        : GrSingleTextureEffect(texture, matrix, params, coordSet) {
+        : GrSingleTextureEffect(texture, std::move(colorSpaceXform), matrix, params, coordSet) {
         this->initClassID<GrSimpleTextureEffect>();
     }
 
     GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
 
     void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
 
     bool onIsEqual(const GrFragmentProcessor& other) const override { return true; }
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif