Merge SkCodec with SkScanlineDecoder

src/codec/SkJpegCodec.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkJpegCodec_DEFINED
 #define SkJpegCodec_DEFINED
 
 #include "SkCodec.h"
 #include "SkImageInfo.h"
 #include "SkJpegDecoderMgr.h"
 #include "SkJpegUtility_codec.h"
 #include "SkStream.h"
 
 extern "C" {
     #include "jpeglib.h"
 }
 
-class SkScanlineDecoder;
-
 /*
  *
  * This class implements the decoding for jpeg images
  *
  */
 class SkJpegCodec : public SkCodec {
 public:
 
     /*
      * Checks the start of the stream to see if the image is a jpeg
      * Does not take ownership of the stream
      */
     static bool IsJpeg(SkStream*);
 
     /*
      * Assumes IsJpeg was called and returned true
      * Creates a jpeg decoder
      * Takes ownership of the stream
      */
     static SkCodec* NewFromStream(SkStream*);
 
-    /*
-     * Assumes IsJpeg was called and returned true
-     * Creates a jpeg scanline decoder
-     * Takes ownership of the stream
-     */
-    static SkScanlineDecoder* NewSDFromStream(SkStream*);
-
 protected:
 
     /*
      * Recommend a set of destination dimensions given a requested scale
      */
     SkISize onGetScaledDimensions(float desiredScale) const override;
 
     /*
      * Initiates the jpeg decode
      */
@@ skipping 34 matching lines @@
      * Creates an instance of the decoder
      * Called only by NewFromStream
      *
      * @param srcInfo contains the source width and height
      * @param stream the encoded image data
      * @param decoderMgr holds decompress struct, src manager, and error manager
      *                   takes ownership
      */
     SkJpegCodec(const SkImageInfo& srcInfo, SkStream* stream, JpegDecoderMgr* decoderMgr);
 
+    ~SkJpegCodec() override;
+
     /*
      * Checks if the conversion between the input image and the requested output
      * image has been implemented
      * Sets the output color space
      */
     bool setOutputColorSpace(const SkImageInfo& dst);
 
     /*
      * Checks if we can natively scale to the requested dimensions and natively scales the 
      * dimensions if possible
      */
     bool nativelyScaleToDimensions(uint32_t width, uint32_t height); 
 
+    // scanline decoding
+    Result initializeSwizzler(const SkImageInfo&, const SkCodec::Options&);
+    Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& options,
+                   SkPMColor ctable[], int* ctableCount) override;
+    Result onGetScanlines(void* dst, int count, size_t rowBytes) override;
+    Result onSkipScanlines(int count) override;
+
     SkAutoTDelete<JpegDecoderMgr> fDecoderMgr;
     // We will save the state of the decompress struct after reading the header.
     // This allows us to safely call onGetScaledDimensions() at any time.
     const int                     fReadyState;
+
+    // scanline decoding
+    SkAutoMalloc               fStorage;    // Only used if sampling is needed
+    uint8_t*                   fSrcRow;     // Only used if sampling is needed
+    SkAutoTDelete<SkSwizzler>  fSwizzler;
     
-    friend class SkJpegScanlineDecoder;
-
     typedef SkCodec INHERITED;
 };
 
 #endif