How does pyqt5 display a part of a picture?

such as

QPixmap("./res/shadow/left_top.png")

is used to make the upper left corner of the window shadow,
but this requires 8 pictures, can you use different parts of a picture? Similar to the nine palace grid cut chart
Thank you

Jul.28,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e45010-44b12.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e45010-44b12.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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