78 lines
2.9 KiB
Python
78 lines
2.9 KiB
Python
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#!/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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import ctypes
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from typing import List, Tuple
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from abc import ABC, abstractmethod
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QrCodePoint = Tuple[int, int]
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QrCodePointList = List[QrCodePoint]
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class QrCodeResult():
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"""
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A detected QR code.
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"""
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def __init__(self, data: str, center: QrCodePoint, points: QrCodePointList):
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self.data: str = data
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self.center: QrCodePoint = center
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self.points: QrCodePointList = points
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def __str__(self) -> str:
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return 'data: {} center: {} points: {}'.format(self.data, self.center, self.points)
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def __hash__(self):
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return hash(self.data)
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def __eq__(self, other):
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return self.data == other.data
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def __ne__(self, other):
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return not self == other
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class AbstractQrCodeReader(ABC):
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"""
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Abstract base class for QR code readers.
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"""
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def interval(self) -> float:
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''' Reimplement to specify a time (in seconds) that the implementation
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recommends elapse between subsequent calls to read_qr_code.
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Implementations that have very expensive and/or slow detection code
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may want to rate-limit read_qr_code calls by overriding this function.
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e.g.: to make detection happen every 200ms, you would return 0.2 here.
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Defaults to 0.0'''
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return 0.0
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@abstractmethod
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def read_qr_code(self, buffer: ctypes.c_void_p,
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buffer_size: int, # overall image size in bytes
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rowlen_bytes: int, # the scan line length in bytes. (many libs, such as OSX, expect this value to properly grok image data)
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width: int, height: int, frame_id: int = -1) -> List[QrCodeResult]:
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"""
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Reads a QR code from an image buffer in Y800 / GREY format.
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Returns a list of detected QR codes which includes their data and positions.
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"""
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