Prototype of RAW decoding in Skia.

src/core/SkStreamPriv.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkStreamPriv_DEFINED
 #define SkStreamPriv_DEFINED
 
 class SkAutoMalloc;
+class SkDynamicMemoryWStream;
 class SkStream;
 class SkStreamRewindable;
 class SkData;
 
 /**
  *  Copy the provided stream to memory allocated by storage.
  *  Used by SkImageDecoder_libbmp and SkImageDecoder_libico.
  *  @param storage Allocator to hold the memory. Will be reset to be large
  *      enough to hold the entire stream. Upon successful return,
  *      storage->get() will point to data holding the SkStream's entire
@@ skipping 19 matching lines @@
  *  otherwise allocating memory for a copy).  The position of the
  *  input stream is left in an indeterminate state.
  */
 SkStreamRewindable* SkStreamRewindableFromSkStream(SkStream* stream);
 
 /**
  *  Copies the input stream from the current position to the end.
  *  Does not rewind the input stream.
  */
 bool SkStreamCopy(SkWStream* out, SkStream* input);
+bool SkStreamCopyToDynamicMemoryW(SkDynamicMemoryWStream* out, SkStream* input);

[scroggo, 2016/01/11 17:44:02]

Reviewing this has forced me to take a long hard look at the methods in
SkStreamPriv.

I think we should move towards less versions of copying entire streams, rather
than more. (I've filed skbug.com/4788 to track this, which has some more
detail.)

To sum up: I don't think this function is necessary. I think you should call
SkStreamCopy from your code, and not mess with this file. (When I suggested
refactoring SkCopyStreamToStorage, I did not realize how many versions of the
same code we had.)

Taken a step further, you can just make the SkDynamicMemoryWStream your read and
write buffer. It is an SkWStream, so you can pass it to the existing
SkStreamCopy. It also has an interface that allows for reading. So rather than
copying it to a single contiguous block of memory, you can just call
SkDynamicMemoryWStream::read() in DoRead and GetData.

[yujieqin, 2016/01/13 15:29:41]

reverted.

 
 #endif  // SkStreamPriv_DEFINED