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AFAIK the GWorld stuff was only added in System 7, which is why I did the backing bitmap approach so I could support System 6. And I got the idea from looking at the Glypha source here: https://github.com/softdorothy/Glypha3. Specficially the CreateOffscreenBitMap() method here...

For MacLO I wrote some fairly portable code for managing an offscreen buffer for a given Window: https://github.com/jonthysell/MacLO/blob/main/src/WindowBuffer.h https://github.com/jonthysell/MacLO/blob/main/src/WindowBuffer.c /jon