Support RGBA/BGRA swizzles using SkEncodedInfo

src/codec/SkRawCodec.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 "SkCodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 654 matching lines @@
 SkCodec::Result SkRawCodec::onGetPixels(const SkImageInfo& requestedInfo, void* dst,
                                         size_t dstRowBytes, const Options& options,
                                         SkPMColor ctable[], int* ctableCount,
                                         int* rowsDecoded) {
     if (!conversion_possible(requestedInfo, this->getInfo())) {
         SkCodecPrintf("Error: cannot convert input type to output type.\n");
         return kInvalidConversion;
     }
 
     SkAutoTDelete<SkSwizzler> swizzler(SkSwizzler::CreateSwizzler(
-            SkSwizzler::kRGB, nullptr, requestedInfo, options));
+            this->getEncodedInfo(), nullptr, requestedInfo, options));
     SkASSERT(swizzler);
 
     const int width = requestedInfo.width();
     const int height = requestedInfo.height();
     SkAutoTDelete<dng_image> image(fDngImage->render(width, height));
     if (!image) {
         return kInvalidInput;
     }
 
     // Because the DNG SDK can not guarantee to render to requested size, we allow a small
@@ skipping 70 matching lines @@
     SkISize sizeFloor = this->onGetScaledDimensions(1.f / std::floor(fullShortEdge / shortEdge));
     SkISize sizeCeil = this->onGetScaledDimensions(1.f / std::ceil(fullShortEdge / shortEdge));
     return sizeFloor == dim || sizeCeil == dim;
 }
 
 SkRawCodec::~SkRawCodec() {}
 
 SkRawCodec::SkRawCodec(SkDngImage* dngImage)
     : INHERITED(dngImage->getEncodedInfo(), nullptr)
     , fDngImage(dngImage) {}