Skip SkBitmapProvider instantiation in SkImageShader::onContextSize

src/image/SkImageShader.cpp

 /*
  * Copyright 2015 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 "SkBitmapProvider.h"
 #include "SkColorShader.h"
@@ skipping 28 matching lines @@
     buffer.writeUInt(fTileModeY);
     buffer.writeMatrix(this->getLocalMatrix());
     buffer.writeImage(fImage.get());
 }
 
 bool SkImageShader::isOpaque() const {
     return fImage->isOpaque();
 }
 
 size_t SkImageShader::onContextSize(const ContextRec& rec) const {
-    return SkBitmapProcLegacyShader::ContextSize(rec, SkBitmapProvider(fImage.get()).info());
+    return SkBitmapProcLegacyShader::ContextSize(rec, as_IB(fImage)->onImageInfo());
 }
 
 SkShader::Context* SkImageShader::onCreateContext(const ContextRec& rec, void* storage) const {
     return SkBitmapProcLegacyShader::MakeContext(*this, fTileModeX, fTileModeY,
                                                  SkBitmapProvider(fImage.get()), rec, storage);
 }
 
 SkImage* SkImageShader::onIsAImage(SkMatrix* texM, TileMode xy[]) const {
     if (texM) {
         *texM = this->getLocalMatrix();
@@ skipping 197 matching lines @@
     SkShader::TileMode mx = (SkShader::TileMode)buffer.readUInt();
     SkShader::TileMode my = (SkShader::TileMode)buffer.readUInt();
     return image ? image->makeShader(mx, my, &lm) : nullptr;
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkShader)
 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkImageShader)
 SkFlattenable::Register("SkBitmapProcShader", SkBitmapProcShader_CreateProc, kSkShader_Type);
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END