Make SkPicture/SkImageGenerator default to SkCodec

include/core/SkPicture.h

 /*
  * Copyright 2007 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPicture_DEFINED
 #define SkPicture_DEFINED
 
@@ skipping 36 matching lines @@
     typedef bool (*InstallPixelRefProc)(const void* src, size_t length, SkBitmap* dst);
 
     /**
      *  Recreate a picture that was serialized into a stream.
      *  @param SkStream Serialized picture data. Ownership is unchanged by this call.
      *  @param proc Function pointer for installing pixelrefs on SkBitmaps representing the
      *              encoded bitmap data from the stream.
      *  @return A new SkPicture representing the serialized data, or NULL if the stream is
      *          invalid.
      */
-    static SkPicture* CreateFromStream(SkStream*,
-                                       InstallPixelRefProc proc = &SkImageDecoder::DecodeMemory);
+    static SkPicture* CreateFromStream(SkStream*, InstallPixelRefProc proc);
+
+    /**
+     *  Recreate a picture that was serialized into a stream.

[scroggo, 2016/02/09 16:12:17]

Should I include a comment alluding to how we'll decode any encoded images?

[reed1, 2016/02/09 20:46:26]

Sure. Something like...?

Serialized images will be passed to SkImage::NewFromData() or its equivalent

[scroggo, 2016/02/09 21:07:14]

Done - used SkIMageGenerator::NewFromEncoded, which is what we use today (and is
used by SkImage::NewFromData).

+     *  @param SkStream Serialized picture data. Ownership is unchanged by this call.
+     *  @return A new SkPicture representing the serialized data, or NULL if the stream is
+     *          invalid.
+     */
+    static SkPicture* CreateFromStream(SkStream*);
 
     /**
      *  Recreate a picture that was serialized into a buffer. If the creation requires bitmap
      *  decoding, the decoder must be set on the SkReadBuffer parameter by calling
      *  SkReadBuffer::setBitmapDecoder() before calling SkPicture::CreateFromBuffer().
      *  @param SkReadBuffer Serialized picture data.
      *  @return A new SkPicture representing the serialized data, or NULL if the buffer is
      *          invalid.
      */
     static SkPicture* CreateFromBuffer(SkReadBuffer&);
@@ skipping 129 matching lines @@
     static bool IsValidPictInfo(const SkPictInfo& info);
     static SkPicture* Forwardport(const SkPictInfo&, const SkPictureData*);
 
     SkPictInfo createHeader() const;
     SkPictureData* backport() const;
 
     mutable uint32_t fUniqueID;
 };
 
 #endif