c1dbcab9bb
This commit ports the work of EchterAgo and cculianu from Electron-Cash, to implement a new toolchain to scan qr codes. Previously, on Linux and Win, we have been using zbar to access the camera and read qrcodes; and on macOS we used CalinsQRReader (an objective-C project by cculianu). The new toolchain added here can use QtMultimedia to access the camera, and then feed that image into zbar. When used this way, zbar needs fewer dependencies and is easier to compile, in particular it can be compiled for macOS. The new toolchain works on all three platforms, with some caveats (see code comments in related commits) -- so we also keep the end-to-end zbar toolchain; but at least we can drop CalinsQRReader. The related changes in Electron-Cash are spread over 50+ commits (several PRs and direct pushes to master), but see in particular: https://github.com/Electron-Cash/Electron-Cash/pull/1376 some other interesting links:b2b737001c163224cf1f3b31e0fcb1eda015908ehttps://github.com/Electron-Cash/Electron-Cash/pull/1545052aa06c23
78 lines
2.9 KiB
Python
78 lines
2.9 KiB
Python
#!/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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