[cairo] What's mean about CAIRO_OPERATOR_XXX?

charles charles.wang at akomedia.com
Fri Jul 22 07:20:35 PDT 2005

Hi, Carl Worth:

When I use cairo in my program, I have notice about the
cairo_set_operator and CAIRO_OPERATOR_XXX. But I can not find any
documentation about them. Abviously different CAIRO_OPERATOR_XXX will
lead to different effect, can you give me any ideas about the effects of
these values? And what is the default operator for a new created

Another questions, is there any low cost way to clear the surface to all
transparent? CAIRO_OPERATOR_CLEAR can do it or not? If it can, how?


Charles Wang  July 22, 2005

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