Add SkSourceGammaTreatment enum so we know how to create mips

src/core/SkComposeShader.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 "SkComposeShader.h"
 #include "SkColorFilter.h"
 #include "SkColorPriv.h"
@@ skipping 165 matching lines @@
     }
 }
 
 #if SK_SUPPORT_GPU
 
 #include "effects/GrConstColorProcessor.h"
 #include "effects/GrXfermodeFragmentProcessor.h"
 
 /////////////////////////////////////////////////////////////////////
 
-const GrFragmentProcessor* SkComposeShader::asFragmentProcessor(GrContext* context,
-                                                            const SkMatrix& viewM,
-                                                            const SkMatrix* localMatrix,
-                                                            SkFilterQuality fq) const {
+const GrFragmentProcessor* SkComposeShader::asFragmentProcessor(
+                                                     GrContext* context,
+                                                     const SkMatrix& viewM,
+                                                     const SkMatrix* localMatrix,
+                                                     SkFilterQuality fq,
+                                                     SkSourceGammaTreatment gammaTreatment) const {
     // Fragment processor will only support SkXfermode::Mode modes currently.
     SkXfermode::Mode mode;
     if (!(SkXfermode::AsMode(fMode, &mode))) {
         return nullptr;
     }
 
     switch (mode) {
         case SkXfermode::kClear_Mode:
             return GrConstColorProcessor::Create(GrColor_TRANSPARENT_BLACK,
                                                  GrConstColorProcessor::kIgnore_InputMode);
             break;
         case SkXfermode::kSrc_Mode:
-            return fShaderB->asFragmentProcessor(context, viewM, localMatrix, fq);
+            return fShaderB->asFragmentProcessor(context, viewM, localMatrix, fq, gammaTreatment);
             break;
         case SkXfermode::kDst_Mode:
-            return fShaderA->asFragmentProcessor(context, viewM, localMatrix, fq);
+            return fShaderA->asFragmentProcessor(context, viewM, localMatrix, fq, gammaTreatment);
             break;
         default:
             SkAutoTUnref<const GrFragmentProcessor> fpA(fShaderA->asFragmentProcessor(context,
-                                                        viewM, localMatrix, fq));
+                                                        viewM, localMatrix, fq, gammaTreatment));
             if (!fpA.get()) {
                 return nullptr;
             }
             SkAutoTUnref<const GrFragmentProcessor> fpB(fShaderB->asFragmentProcessor(context,
-                                                        viewM, localMatrix, fq));
+                                                        viewM, localMatrix, fq, gammaTreatment));
             if (!fpB.get()) {
                 return nullptr;
             }
             return GrXfermodeFragmentProcessor::CreateFromTwoProcessors(fpB, fpA, mode);
     }
 }
 #endif
 
 #ifndef SK_IGNORE_TO_STRING
 void SkComposeShader::toString(SkString* str) const {
@@ skipping 21 matching lines @@
     if (!dst || !src) {
         return nullptr;
     }
     return sk_make_sp<SkComposeShader>(std::move(dst), std::move(src), std::move(xfer));
 }
 
 sk_sp<SkShader> SkShader::MakeComposeShader(sk_sp<SkShader> dst, sk_sp<SkShader> src,
                                             SkXfermode::Mode mode) {
     return MakeComposeShader(std::move(dst), std::move(src), SkXfermode::Make(mode));
 }