本文整理汇总了Python中cpngfilters.undo_filter_sub方法的典型用法代码示例。如果您正苦于以下问题：Python cpngfilters.undo_filter_sub方法的具体用法？Python cpngfilters.undo_filter_sub怎么用？Python cpngfilters.undo_filter_sub使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类cpngfilters的用法示例。
在下文中一共展示了cpngfilters.undo_filter_sub方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: undo_filter_sub
# 需要导入模块: import cpngfilters [as 别名]
# 或者: from cpngfilters import undo_filter_sub [as 别名]
def undo_filter_sub(filter_unit, scanline, previous, result):
"""Undo sub filter."""
ai = 0
# Loops starts at index fu. Observe that the initial part
# of the result is already filled in correctly with
# scanline.
for i in range(filter_unit, len(result)):
x = scanline[i]
a = result[ai]
result[i] = (x + a) & 0xff
ai += 1