Added tests for buffered streams.

Made wxBufferedOutputStream call Sync() in
    the destructor and SeekO().
  Documented this.
  Use buffered streams in wxImage. Seems to
    significantly speed-up the sample.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4847 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/strmbfrd.tex

@@ -28,8 +28,9 @@ from (such as a file stream or a memory stream).
 
 This stream acts as a cache. It caches the bytes to be written to the specified
 output stream (See \helpref{wxFilterOutputStream}{wxfilteroutputstream}). The
-datas are only written when the cache is full or when the buffered stream is
-destroyed.
+datas are only written when the cache is full, when the buffered stream is
+destroyed or when calling SeekO().
+
 This class may not be used without some other stream to write the data
 to (such as a file stream or a memory stream).
 
@@ -45,3 +46,35 @@ to (such as a file stream or a memory stream).
 
 \helpref{wxStreamBuffer}{wxstreamBuffer}, \helpref{wxOutputStream}{wxoutputstream}
 
+% ----------
+% Members
+% ----------
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+\membersection{wxBufferedOutputStream::wxBufferedOutputStream}
+
+\func{}{wxBufferedOutputStream}{\param{const wxOutputStream\&}{ parent}}
+
+Creates a buffered stream using a buffer of a default size of 1024 bytes for cashing
+the stream {\it parent}.
+
+\membersection{wxBufferedOutputStream::\destruct{wxBufferedOutputStream}}
+
+\func{}{\destruct{wxBufferedOutputStream}}{\void}
+
+Destructor. Calls Sync() and destroys the internal buffer.
+
+\membersection{wxBufferedOutputStream::SeekO}
+
+\func{off\_t}{SeekO}{\param{off\_t}{ pos}, \param{wxSeekMode}{ mode}}
+
+Calls Sync() and changes the stream position.
+
+\membersection{wxBufferedOutputStream::Sync}
+
+\func{void}{Sync}{\void}
+
+Flushes the buffer and calls Sync() on the parent stream.
+
+
+