pub fn copy(access: Access<'_>, dst: u16, src: &[u8])Available on crate feature
cgb only.Expand description
Copy src to dst in video memory, stopping the CPU until it is done.
The copier does not wait for the PPU. The Access settles where the
transfer starts, not where it ends, so a block long enough to outlast the
window is still being written while the lines it reaches are drawn, and those
come out garbled: size one to the window, or switch the display off.
Nothing runs while it works, which makes a source in a switchable bank safe
here in a way it is not in stream.
ยงPanics
If src is empty, longer than MAX_LEN, not a whole number of
BLOCK_LENs, or misaligned; if dst is outside 0x8000..0xA000, is
misaligned, or has no room; or if a stream is still running, which this
would stop rather than join.