respect srgb gamma when building mips

src/core/SkBitmapProcShader.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcShader.h"
 #include "SkBitmapProcState.h"
 #include "SkBitmapProvider.h"
@@ skipping 208 matching lines @@
                                                    const SkBitmapProvider& provider,
                                                    const ContextRec& rec, void* storage) {
     SkMatrix totalInverse;
     // Do this first, so we know the matrix can be inverted.
     if (!shader.computeTotalInverse(rec, &totalInverse)) {
         return nullptr;
     }
 
     // Decide if we can/want to use the new linear pipeline
     bool useLinearPipeline = choose_linear_pipeline(rec, provider.info());
+    SkMipMap::SrcGammaMode mode = SkMipMap::DeduceMode(rec);
 
     if (useLinearPipeline) {
         void* infoStorage = (char*)storage + sizeof(LinearPipelineContext);
-        SkBitmapProcInfo* info = new (infoStorage) SkBitmapProcInfo(provider, tmx, tmy);
+        SkBitmapProcInfo* info = new (infoStorage) SkBitmapProcInfo(provider, tmx, tmy, mode);
         if (!info->init(totalInverse, *rec.fPaint)) {
             info->~SkBitmapProcInfo();
             return nullptr;
         }
 
         return new (storage) LinearPipelineContext(shader, rec, info);
     } else {
         void* stateStorage = (char*)storage + sizeof(BitmapProcShaderContext);
-        SkBitmapProcState* state = new (stateStorage) SkBitmapProcState(provider, tmx, tmy);
+        SkBitmapProcState* state = new (stateStorage) SkBitmapProcState(provider, tmx, tmy, mode);
         if (!state->setup(totalInverse, *rec.fPaint)) {
             state->~SkBitmapProcState();
             return nullptr;
         }
         return new (storage) BitmapProcShaderContext(shader, rec, state);
     }
 }
 
 SkShader::Context* SkBitmapProcShader::onCreateContext(const ContextRec& rec, void* storage) const {
     return MakeContext(*this, (TileMode)fTileModeX, (TileMode)fTileModeY,
@@ skipping 203 matching lines @@
         inner.reset(GrSimpleTextureEffect::Create(texture, matrix, params));
     }
 
     if (kAlpha_8_SkColorType == fRawBitmap.colorType()) {
         return GrFragmentProcessor::MulOutputByInputUnpremulColor(inner);
     }
     return GrFragmentProcessor::MulOutputByInputAlpha(inner);
 }
 
 #endif