libfprint/tests/capture.py

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#!/usr/bin/python3
import gi
gi.require_version('FPrint', '2.0')
from gi.repository import FPrint, GLib
import cairo
import sys
if len(sys.argv) != 2:
print("Please specify exactly one argument, the output location for the capture image")
sys.exit(1)
ctx = GLib.main_context_default()
c = FPrint.Context()
c.enumerate()
devices = c.get_devices()
d = devices[0]
del devices
d.open_sync()
img = d.capture_sync(True)
d.close_sync()
del d
del c
width = img.get_width()
height = img.get_height()
c_img = cairo.ImageSurface(cairo.FORMAT_RGB24, width, height)
c_rowstride = c_img.get_stride()
buf = img.get_data()
c_buf = c_img.get_data()
for x in range(width):
for y in range(height):
# The upper byte is don't care, but the location depends on endianness,
# so just set all of them.
c_buf[y * c_rowstride + x * 4 + 0] = buf[y * width + x]
c_buf[y * c_rowstride + x * 4 + 1] = buf[y * width + x]
c_buf[y * c_rowstride + x * 4 + 2] = buf[y * width + x]
c_buf[y * c_rowstride + x * 4 + 3] = buf[y * width + x]
c_img.mark_dirty()
c_img.write_to_png(sys.argv[1])