"""
Writing PNGs
"""

#-----------------------------------------------------------------------------
# Copyright (c) 2013, yt Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------

import matplotlib._png as _png
#- from yt.extern.six.moves import cStringIO as IO
try:
    from cStringIO import StringIO as VirtualIO
except ImportError:
    from io import BytesIO as VirtualIO

def write_png(buffer, filename, dpi=100):
#-    width = buffer.shape[1]
#-    height = buffer.shape[0]
#-    _png.write_png(buffer, width, height, filename, dpi)
    _png.write_png(buffer, filename, dpi)

def write_png_to_string(buffer, dpi=100, gray=0):
#-    width = buffer.shape[1]
#-   height = buffer.shape[0]
#-   fileobj = cStringIO()
    fileobj = VirtualIO()
#-    _png.write_png(buffer, width, height, fileobj, dpi)
    _png.write_png(buffer, fileobj, dpi)
    png_str = fileobj.getvalue()
    fileobj.close()
    return png_str