107 lines
3.7 KiB
Python
107 lines
3.7 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# Copyright (c) 2008-2021 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 the QOI image format.
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"""
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from ctypes import Structure, BigEndianStructure
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from ctypes import c_uint8, c_uint32, c_char
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from pyglet.image import ImageData, ImageDecodeException
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from pyglet.image.codecs import ImageDecoder, ImageEncoder
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class Header(BigEndianStructure):
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_pack_ = 1
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_fields_ = (
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('magic', c_char * 4), # char magic[4]; // magic bytes "qoif"
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('width', c_uint32), # uint32_t width; // image width in pixels (BE)
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('height', c_uint32), # uint32_t height; // image height in pixels (BE)
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('channels', c_uint8), # uint8_t channels; // 3 = RGB, 4 = RGBA
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('colorspace', c_uint8) # uint8_t colorspace; // 0 = sRGB with linear alpha, 1 = all channels linear
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)
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class QOImageDecoder(ImageDecoder):
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def get_file_extensions(self):
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return ['.qoi']
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def decode(self, filename, file):
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if not file:
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file = open(filename, 'rb')
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header = Header()
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file.readinto(header)
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if header.magic != b'qoif':
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raise ImageDecodeException('Invalid QOI header.')
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# TODO: finish
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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 QOImageEncoder(ImageEncoder):
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def get_file_extensions(self):
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return ['.qoi']
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def encode(self, image, filename, file):
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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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# TODO: finish
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def get_decoders():
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return [QOImageDecoder()]
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def get_encoders():
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return [QOImageEncoder()]
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