Swizzler changes Index8 and 565

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 "SkImageInfo.h"
 
@@ skipping 16 matching lines @@
      * 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*);
     
 
 protected:
 
     /*
+     * Read enough of the stream to initialize the SkGifCodec.

[scroggo, 2015/04/09 17:37:17]

Please add comments regarding ownership of SkStream.

Deleted on failure.

codecOut will take ownership of it in the case where we created a codec.

Ownership is unchanged when we returned a gifOut.

[msarett, 2015/04/09 19:21:31]

Done.

+     * Returns a bool representing success or failure.
+     *
+     * If it returned true, and codecOut was not NULL,
+     * codecOut will be set to a new SkGifCodec.
+     *
+     * If it returned true, and codecOut was NULL,
+     * gifOut must be non-NULL and gifOut will be set to a new
+     * GifFileType pointer.
+     */
+    static bool ReadHeader(SkStream*, SkCodec** codecOut, GifFileType** gifOut);
+
+    /*
      * Initiates the gif decode
      */
     Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&,
             SkPMColor*, int32_t*) override;
 
     SkEncodedFormat onGetEncodedFormat() const override {
         return kGIF_SkEncodedFormat;
     }
 
 private:
@@ skipping 18 matching lines @@
      * @param stream the stream of image data
      * @param gif pointer to library type that manages gif decode
      *            takes ownership
      */
     SkGifCodec(const SkImageInfo& srcInfo, SkStream* stream, GifFileType* gif);
 
     SkAutoTCallIProc<GifFileType, CloseGif> fGif; // owned
 
     typedef SkCodec INHERITED;
 };