Merge SkCodec with SkScanlineDecoder

src/codec/SkCodec_libgif.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.
  */
 
 #include "SkCodec.h"
 #include "SkColorTable.h"
 #include "SkImageInfo.h"
-#include "SkScanlineDecoder.h"
 #include "SkSwizzler.h"
 
 #include "gif_lib.h"
 
 /*
  *
  * This class implements the decoding for gif images
  *
  */
 class SkGifCodec : public SkCodec {
 public:
 
     /*
      * Checks the start of the stream to see if the image is a gif
      */
     static bool IsGif(SkStream*);
 
     /*
      * Assumes IsGif was called and returned true
      * Creates a gif decoder
      * Reads enough of the stream to determine the image format
      */
     static SkCodec* NewFromStream(SkStream*);
 
-    static SkScanlineDecoder* NewSDFromStream(SkStream* stream);
-
 protected:
 
     /*
      * Read enough of the stream to initialize the SkGifCodec.
      * Returns a bool representing success or failure.
      *
      * @param codecOut
      * If it returned true, and codecOut was not nullptr,
      * codecOut will be set to a new SkGifCodec.
      *
@@ skipping 28 matching lines @@
     /*
      * A gif can contain multiple image frames.  We will only decode the first
      * frame.  This function reads up to the first image frame, processing
      * transparency and/or animation information that comes before the image
      * data.
      *
      * @param gif        Pointer to the library type that manages the gif decode
      * @param transIndex This call will set the transparent index based on the
      *                   extension data.
      */
-     static SkCodec::Result ReadUpToFirstImage(GifFileType* gif, uint32_t* transIndex);
+     static Result ReadUpToFirstImage(GifFileType* gif, uint32_t* transIndex);
 
      /*
       * A gif may contain many image frames, all of different sizes.
       * This function checks if the frame dimensions are valid and corrects
       * them if necessary.  It then sets fFrameDims to the corrected
       * dimensions.
       *
       * @param desc The image frame descriptor
       */
      bool setFrameDimensions(const GifImageDesc& desc);
@@ skipping 10 matching lines @@
      *                        table to ensure that indexing is always in
      *                        bounds.
      */
     void initializeColorTable(const SkImageInfo& dstInfo, SkPMColor* colorPtr,
             int* inputColorCount);
 
    /*
     * Checks for invalid inputs and calls rewindIfNeeded(), setFramDimensions(), and
     * initializeColorTable() in the proper sequence.
     */
-    SkCodec::Result prepareToDecode(const SkImageInfo& dstInfo, SkPMColor* inputColorPtr,
+    Result prepareToDecode(const SkImageInfo& dstInfo, SkPMColor* inputColorPtr,
             int* inputColorCount, const Options& opts);
 
     /*
      * Initializes the swizzler.
      *
      * @param dstInfo  Output image information.  Dimensions may have been
      *                 adjusted if the image frame size does not match the size
      *                 indicated in the header.
      * @param zeroInit Indicates if destination memory is zero initialized.
      */
-    SkCodec::Result initializeSwizzler(const SkImageInfo& dstInfo,
-            ZeroInitialized zeroInit);
+    Result initializeSwizzler(const SkImageInfo& dstInfo, ZeroInitialized zeroInit);
 
     /*
      * @return kSuccess if the read is successful and kIncompleteInput if the
      *         read fails.
      */
-    SkCodec::Result readRow();
+    Result readRow();
+
+    Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& opts,
+                   SkPMColor inputColorPtr[], int* inputColorCount) override;
+
+    Result onGetScanlines(void* dst, int count, size_t rowBytes) override;
+
+    SkScanlineOrder onGetScanlineOrder() const override;
+
+    int onNextScanline() const override;
 
     /*
      * This function cleans up the gif object after the decode completes
      * It is used in a SkAutoTCallIProc template
      */
     static void CloseGif(GifFileType* gif);
 
     /*
      * Frees any extension data used in the decode
      * Used in a SkAutoTCallVProc
@@ skipping 15 matching lines @@
 
     SkAutoTCallVProc<GifFileType, CloseGif> fGif; // owned
     SkAutoTDeleteArray<uint8_t>             fSrcBuffer;
     SkIRect                                 fFrameDims;
     const uint32_t                          fTransIndex;
     uint32_t                                fFillIndex;
     bool                                    fFrameIsSubset;
     SkAutoTDelete<SkSwizzler>               fSwizzler;
     SkAutoTUnref<SkColorTable>              fColorTable;
 
-    friend class SkGifScanlineDecoder;
-
     typedef SkCodec INHERITED;
 };