how to draw NOT on the backbuffer

BlitzMax Forums/BlitzMax Programming/how to draw NOT on the backbuffer

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If I want to draw some stuff on a pixmap (NOT the backbuffer), and then copy the content from the pixmap to the backbuffer should I work on an image with lockimage (?) or are there better ways (for the "pixmap" controls there is no documentation)

Thx,

Matteo