vga_copytoplanar256 man page
vga_copytoplanar256 — copy linear pixmap into Mode X video memory
void vga_copytoplanar256(unsigned char *virtual, int pitch, int voffset, int vpitch, int w, int h);
Copy part of a linear virtual screen in system memory at *virtual to Mode X style video memory. pitch is the logical width of the virtual screen (in pixels (which are one byte large)), voffset is the address offset into video memory, vpitch is the logical scanline width of the screen. (w, h) is the width and height of the area to copy in pixels (w must be a multiple of 4).
svgalib(7), vgagl(7), libvga.config(5), vga_accel(3), vga_copytoplanar16(3), vga_copytoplane(3), vga_drawscanline(3), vga_drawscansegment(3), vga_getmodeinfo(3), vga_setlogicalwidth(3), vga_imageblt(3), vga_setmodeX(3),
This manual page was edited by Michael Weller <email@example.com>. The exact source of the referenced function as well as of the original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.
Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections to this first version of the svgalib manual.
svgalib(7), vga_copytoplanar16(3), vga_copytoplane(3).