112 lines
3.7 KiB
Python
112 lines
3.7 KiB
Python
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# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# Copyright (c) 2008-2020 pyglet contributors
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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"""Encoder and decoder for PNG files, using PyPNG (png.py).
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"""
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import array
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import itertools
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from pyglet.image import *
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from pyglet.image.codecs import *
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import pyglet.extlibs.png as pypng
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class PNGImageDecoder(ImageDecoder):
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def get_file_extensions(self):
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return ['.png']
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def decode(self, file, filename):
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try:
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reader = pypng.Reader(file=file)
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width, height, pixels, metadata = reader.asDirect()
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except Exception as e:
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raise ImageDecodeException(
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'PyPNG cannot read %r: %s' % (filename or file, e))
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if metadata['greyscale']:
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if metadata['alpha']:
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fmt = 'LA'
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else:
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fmt = 'L'
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else:
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if metadata['alpha']:
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fmt = 'RGBA'
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else:
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fmt = 'RGB'
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pitch = len(fmt) * width
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pixels = array.array('BH'[metadata['bitdepth'] > 8], itertools.chain(*pixels))
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return ImageData(width, height, fmt, pixels.tobytes(), -pitch)
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class PNGImageEncoder(ImageEncoder):
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def get_file_extensions(self):
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return ['.png']
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def encode(self, image, file, filename):
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image = image.get_image_data()
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has_alpha = 'A' in image.format
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greyscale = len(image.format) < 3
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if has_alpha:
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if greyscale:
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image.format = 'LA'
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else:
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image.format = 'RGBA'
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else:
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if greyscale:
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image.format = 'L'
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else:
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image.format = 'RGB'
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image.pitch = -(image.width * len(image.format))
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writer = pypng.Writer(image.width, image.height, bytes_per_sample=1, greyscale=greyscale, alpha=has_alpha)
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data = array.array('B')
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data.fromstring(image.get_data(image.format, image.pitch))
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writer.write_array(file, data)
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def get_decoders():
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return [PNGImageDecoder()]
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def get_encoders():
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return [PNGImageEncoder()]
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