Make "alpha only" be a property of GrTextureProducer

src/gpu/GrTextureParamsAdjuster.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 "GrTextureParamsAdjuster.h"
 
 #include "GrCaps.h"
@@ skipping 103 matching lines @@
     SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(copy->asRenderTarget()));
     if (!drawContext) {
         return nullptr;
     }
 
     SkRect dstRect = SkRect::MakeWH(SkIntToScalar(rtDesc.fWidth), SkIntToScalar(rtDesc.fHeight));
     drawContext->fillRectToRect(GrClip::WideOpen(), paint, SkMatrix::I(), dstRect, localRect);
     return copy.detach();
 }
 
-GrTextureAdjuster::GrTextureAdjuster(GrTexture* original, const SkIRect& contentArea)
-    : INHERITED(contentArea.width(), contentArea.height())
+GrTextureAdjuster::GrTextureAdjuster(GrTexture* original,
+                                     const SkIRect& contentArea,
+                                     bool isAlphaOnly)
+    : INHERITED(contentArea.width(), contentArea.height(), isAlphaOnly)
     , fOriginal(original) {
     SkASSERT(SkIRect::MakeWH(original->width(), original->height()).contains(contentArea));
     if (contentArea.fLeft > 0 || contentArea.fTop > 0 ||
         contentArea.fRight < original->width() || contentArea.fBottom < original->height()) {
         fContentArea.set(contentArea);
     }
 }
 
 GrTexture* GrTextureAdjuster::refTextureSafeForParams(const GrTextureParams& params,
                                                       SkIPoint* outOffset) {
@@ skipping 339 matching lines @@
                                            filterOrNullForBicubic);
 }
 
 GrTexture* GrTextureMaker::generateTextureForParams(const CopyParams& copyParams) {
     SkAutoTUnref<GrTexture> original(this->refOriginalTexture());
     if (!original) {
         return nullptr;
     }
     return copy_on_gpu(original, nullptr, copyParams);
 }