I wish I knew more about this whole "blit" thing, ...
This is easy :-) .
AFAIK, with "accelerated" graphics you distinguish between processor-memory-based and "card"-based memory. The CPU only can access the processor memory directly, but the card memory is behind some driver using the card's hardware interface and that makes access by the processor very slow, but allows very fast access by any graphic hardware function. Bitmaps can be either in the processor memory or in the card memory. If they are in the card memory, they can either be "on screen" (visible) or "off-screen" (invisible).
The "bilt" functions the driver provides now copy a bitmap (rectangle) from one memory location onto another, using the processor if only processor memory is involved, using some hardware "processor" on the card, if only card-memory is involved and using the driver hardware-interface if both are involved.
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