move SK_MMAP_SUPPORT into SkPreConfig, so we can know about its availability

trunk/include/core/SkStream.h

 
 /*
  * Copyright 2006 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 SkStream_DEFINED
 #define SkStream_DEFINED
 
 #include "SkRefCnt.h"
 #include "SkScalar.h"
 
 class SkData;
 
 class SK_API SkStream : public SkRefCnt {
 public:
+    /**
+     *  Attempts to open the specified file, and return a stream to it (using
+     *  mmap if available). On success, the caller must call unref() on the
+     *  returned object. On failure, returns NULL.
+     */
+    static SkStream* NewFromFile(const char path[]);
+    
     SK_DECLARE_INST_COUNT(SkStream)
 
     /** Called to rewind to the beginning of the stream. If this cannot be
         done, return false.
     */
     virtual bool rewind() = 0;
     /** If this stream represents a file, this method returns the file's name.
         If it does not, it returns NULL (the default behavior).
     */
     virtual const char* getFileName();
@@ skipping 343 matching lines @@
     virtual void newline() SK_OVERRIDE;
 
 private:
     typedef SkWStream INHERITED;
 };
 
 // for now
 typedef SkFILEStream SkURLStream;
 
 #endif