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详细说明：This functions displays GUI for selecting square or rectangular part
of the input image IMG. To perform selection user must click mouse twice:
at two corners of the selection area.
User can change the shape at any moment, even when first point is set,
unless it is not forbidden by additional parameters.
Use also cam change the way the selection area is calculated
from the two selected points.
Depending on the combination of the shape and mode it could be
文件列表(点击判断是否您需要的文件):
(没有文件，原文件不完全或已损坏或有密码)
(没有文件，原文件不完全或已损坏或有密码)