use gpu-image instead of wrapping in a bitmap for specialimage

src/core/SkSpecialImage.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file
  */
 #include "SkSpecialImage.h"
 
 #if SK_SUPPORT_GPU
 #include "GrTexture.h"
@@ skipping 455 matching lines @@
     bool isOpaque() const override {
         return GrPixelConfigIsOpaque(fTexture->config()) || fAlphaType == kOpaque_SkAlphaType;
     }
 
     size_t getSize() const override { return fTexture->gpuMemorySize(); }
 
     void onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const override {
         SkRect dst = SkRect::MakeXYWH(x, y,
                                       this->subset().width(), this->subset().height());
 
-        SkBitmap bm;
+        auto img = sk_sp<SkImage>(new SkImage_Gpu(fTexture->width(), fTexture->height(),
+                                                  this->uniqueID(), fAlphaType, fTexture.get(),
+                                                  SkBudgeted::kNo));
 
-        GrWrapTextureInBitmap(fTexture.get(),
-                              fTexture->width(), fTexture->height(), this->isOpaque(), &bm);
-
-        canvas->drawBitmapRect(bm, this->subset(),
+        canvas->drawImageRect(img, this->subset(),
                                dst, paint, SkCanvas::kStrict_SrcRectConstraint);
     }
 
     GrTexture* onPeekTexture() const override { return fTexture.get(); }
 
     sk_sp<GrTexture> onAsTextureRef(GrContext*) const override { return fTexture; }
 
     bool onGetROPixels(SkBitmap* dst) const override {
         if (SkBitmapCache::Find(this->uniqueID(), dst)) {
             SkASSERT(dst->getGenerationID() == this->uniqueID());
@@ skipping 95 matching lines @@
 sk_sp<SkSpecialImage> SkSpecialImage::MakeFromGpu(const SkIRect& subset,
                                                   uint32_t uniqueID,
                                                   sk_sp<GrTexture> tex,
                                                   const SkSurfaceProps* props,
                                                   SkAlphaType at) {
     SkASSERT(rect_fits(subset, tex->width(), tex->height()));
     return sk_make_sp<SkSpecialImage_Gpu>(subset, uniqueID, std::move(tex), at, props);
 }
 
 #endif