112 lines
3.7 KiB
Python
112 lines
3.7 KiB
Python
# ----------------------------------------------------------------------------
|
|
# pyglet
|
|
# Copyright (c) 2006-2008 Alex Holkner
|
|
# Copyright (c) 2008-2020 pyglet contributors
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
#
|
|
# * Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# * Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in
|
|
# the documentation and/or other materials provided with the
|
|
# distribution.
|
|
# * Neither the name of pyglet nor the names of its
|
|
# contributors may be used to endorse or promote products
|
|
# derived from this software without specific prior written
|
|
# permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
# POSSIBILITY OF SUCH DAMAGE.
|
|
# ----------------------------------------------------------------------------
|
|
|
|
"""Encoder and decoder for PNG files, using PyPNG (png.py).
|
|
"""
|
|
|
|
import array
|
|
import itertools
|
|
|
|
from pyglet.image import *
|
|
from pyglet.image.codecs import *
|
|
|
|
import pyglet.extlibs.png as pypng
|
|
|
|
|
|
class PNGImageDecoder(ImageDecoder):
|
|
def get_file_extensions(self):
|
|
return ['.png']
|
|
|
|
def decode(self, file, filename):
|
|
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)
|
|
|
|
|
|
class PNGImageEncoder(ImageEncoder):
|
|
def get_file_extensions(self):
|
|
return ['.png']
|
|
|
|
def encode(self, image, file, filename):
|
|
image = image.get_image_data()
|
|
|
|
has_alpha = 'A' in image.format
|
|
greyscale = len(image.format) < 3
|
|
if has_alpha:
|
|
if greyscale:
|
|
image.format = 'LA'
|
|
else:
|
|
image.format = 'RGBA'
|
|
else:
|
|
if greyscale:
|
|
image.format = 'L'
|
|
else:
|
|
image.format = 'RGB'
|
|
|
|
image.pitch = -(image.width * len(image.format))
|
|
|
|
writer = pypng.Writer(image.width, image.height, bytes_per_sample=1, greyscale=greyscale, alpha=has_alpha)
|
|
|
|
data = array.array('B')
|
|
data.fromstring(image.get_data(image.format, image.pitch))
|
|
|
|
writer.write_array(file, data)
|
|
|
|
|
|
def get_decoders():
|
|
return [PNGImageDecoder()]
|
|
|
|
|
|
def get_encoders():
|
|
return [PNGImageEncoder()]
|