8cdeeeaaf1
With this script it is possible to test libfprint/fprintd without any hardware device. The image needs to be provides as a PNG with the alpha channel storing the print data. See the comment in the file on how the script can be used.
87 lines
2.2 KiB
Python
Executable file
87 lines
2.2 KiB
Python
Executable file
#!/usr/bin/env python3
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# This script can be used together with the virtual_imgdev to simulate an
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# image based fingerprint reader.
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#
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# To use, set the FP_VIRTUAL_IMGDEV environment variable for both the
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# libfprint using program (e.g. fprintd) and this script.
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#
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# Usually this would work by adding it into the systemd unit file. The
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# best way of doing so is to create
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# /etc/systemd/system/fprintd.service.d/fprintd-test.conf
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#
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# [Service]
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# RuntimeDirectory=fprint
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# Environment=FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock
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# Environment=G_MESSAGES_DEBUG=all
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# ReadWritePaths=$RUNTIME_DIR
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#
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# After that run:
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#
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# systemctl daemon-reload
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# systemctl restart fprintd.service
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#
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# You may also need to disable selinux.
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#
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# Then run this script with e.g.
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# FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock ./sendvirtimg.py prints/whorl.png
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import cairo
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import sys
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import os
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import socket
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import struct
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if len(sys.argv) == 2:
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png = cairo.ImageSurface.create_from_png(sys.argv[1])
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# Cairo wants 4 byte aligned rows, so just add a few pixel if necessary
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w = png.get_width()
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h = png.get_height()
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w = (w + 3) // 4 * 4
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h = (h + 3) // 4 * 4
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img = cairo.ImageSurface(cairo.Format.A8, w, h)
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cr = cairo.Context(img)
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cr.set_source_rgba(1, 1, 1, 1)
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cr.paint()
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cr.set_source_rgba(0, 0, 0, 0)
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cr.set_operator(cairo.OPERATOR_SOURCE)
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cr.set_source_surface(png)
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cr.paint()
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else:
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sys.stderr.write('You need to pass a PNG with an alpha channel!\n')
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sys.exit(1)
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def write_dbg_img():
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dbg_img_rgb = cairo.ImageSurface(cairo.Format.RGB24, img.get_width(), img.get_height())
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dbg_cr = cairo.Context(dbg_img_rgb)
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dbg_cr.set_source_rgb(0, 0, 0)
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dbg_cr.paint()
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dbg_cr.set_source_rgb(1, 1, 1)
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dbg_cr.mask_surface(img, 0, 0)
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dbg_img_rgb.write_to_png('/tmp/test.png')
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#write_dbg_img()
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# Send image through socket
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sockaddr = os.environ['FP_VIRTUAL_IMGDEV']
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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sock.connect(sockaddr)
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mem = img.get_data()
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mem = mem.tobytes()
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assert len(mem) == img.get_width() * img.get_height()
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encoded_img = struct.pack('ii', img.get_width(), img.get_height())
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encoded_img += mem
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sock.sendall(encoded_img)
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