Chris Sherlock wrote: > Could anyone give any insight into this? > There's a very old 'optimization' trick to clip output on a raster display, which is to draw the original content in XOR mode, then the clip mask in black, and then the content again in XOR. This avoids complex clip region generation (if the clip is complex), which used to be notoriously slow on come platforms / drivers.
Nowadays, I'd think it's almost exclusively a pessimisation. Clearly on OSX, it's not usable as the platform provides no generic XOR draw mode. HTH, -- Thorsten
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