def decode(self, file, filename):
try:
reader = pypng.Reader(file=file)
width, height, pixels, metadata = reader.asDirect()
except Exception, e:
raise ImageDecodeException(
'PyPNG cannot read %r: %s' % (filename or file, e))
def decode(self, filename, file):
if not file:
file = open(filename, 'rb')
try:
reader = pypng.Reader(file=file)
width, height, pixels, metadata = reader.asDirect()
except Exception as e:
raise ImageDecodeException('PyPNG cannot read %r: %s' %
(filename or file, e))
if metadata['greyscale']:
if metadata['alpha']:
fmt = 'LA'
else:
fmt = 'L'
else:
if metadata['alpha']:
fmt = 'RGBA'
else:
fmt = 'RGB'
pitch = len(fmt) * width
pixels = array.array('BH'[metadata['bitdepth'] > 8],
itertools.chain(*pixels))
return ImageData(width, height, fmt, pixels.tobytes(), -pitch)