Bug 190981 The image id of image in different pages are the same
The id of image generated by the same report item (such as chart) are the same, thought the image contents are in different pages.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/presentation/LocalizedContentVisitor.java
BufferedInputStream bin = in instanceof BufferedInputStream
				? (BufferedInputStream) in
				: new BufferedInputStream( in );
		ByteArrayOutputStream out = new ByteArrayOutputStream( 1024 );
		byte[] buffer = new byte[1024];
		int readSize = 0;
		try
		{
			readSize = bin.read( buffer );
			while ( readSize != -1 )
			{
				out.write( buffer, 0, readSize );
				readSize = bin.read( buffer );
			}
		}
		catch ( IOException ex )
		{
			logger.log( Level.SEVERE, ex.getMessage( ), ex );
		}
		return out.toByteArray( );
	}
	
	protected void handleOnRender( IContent content )
	{
		if ( content.getGenerateBy( ) != null )
		{
			onRenderVisitor.onRender( content );
		}
	}
}