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73 lines
2.5 KiB
73 lines
2.5 KiB
#!/usr/bin/env python3 |
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# |
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# Electron Cash - lightweight Bitcoin client |
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# Copyright (C) 2019 Axel Gembe <derago@gmail.com> |
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# |
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# Permission is hereby granted, free of charge, to any person |
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# obtaining a copy of this software and associated documentation files |
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# (the "Software"), to deal in the Software without restriction, |
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# including without limitation the rights to use, copy, modify, merge, |
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# publish, distribute, sublicense, and/or sell copies of the Software, |
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# and to permit persons to whom the Software is furnished to do so, |
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# subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be |
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# included in all copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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# |
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# A module, that, given an image (buffer), finds and decodes a QR code in it. |
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from typing import Optional |
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from ..logging import get_logger |
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from .abstract_base import AbstractQrCodeReader, QrCodeResult |
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_logger = get_logger(__name__) |
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class MissingQrDetectionLib(RuntimeError): |
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''' Raised if we can't find zbar or whatever other platform lib |
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we require to detect QR in image frames. ''' |
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def get_qr_reader() -> AbstractQrCodeReader: |
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""" |
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Get the Qr code reader for the current platform. |
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Might raise exception: MissingQrDetectionLib. |
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""" |
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excs = [] |
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try: |
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from .zbar import ZbarQrCodeReader |
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return ZbarQrCodeReader() |
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""" |
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# DEBUG CODE BELOW |
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# If you want to test this code on a platform that doesn't yet work or have |
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# zbar, use the below... |
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class Fake(AbstractQrCodeReader): |
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def read_qr_code(self, buffer, buffer_size, dummy, width, height, frame_id = -1): |
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''' fake noop to test ''' |
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return [] |
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return Fake() |
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""" |
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except MissingLib as e: |
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_logger.exception("") |
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excs.append(e) |
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raise MissingQrDetectionLib(f"The platform QR detection library is not available.\nerrors: {excs!r}") |
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# --- Internals below (not part of external API) |
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class MissingLib(RuntimeError): |
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''' Raised by underlying implementation if missing libs ''' |
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pass
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