linux man page for vga_bitblt

vga_bitblt(3)							Svgalib User Manual						     vga_bitblt(3)

NAME
       vga_bitblt - copy pixmap on screen using an accelerator

SYNOPSIS
       #include <vga.h>

       void vga_bitblt(int srcaddr, int destaddr, int w, int h, int pitch);

DESCRIPTION
       Bitblit	(copy rectangular area in video memory), addresses are offsets into video memory (up to 2M). The pitch is the logical width of the
       screen. Height h is in Pixels, Width w is in BYTES!

       This is an old style function to access the accelerator of an SVGA card. Before calling it you should check for availability of	the  func-
       tion in the mode you use with vga_getmodeinfo(3).

       For new applications you might be better of trying to use vga_accel(3) instead.

       The  old vga_bitblt(3), vga_blitwait(3), vga_fillblt(3), vga_hlinelistblt(3), and vga_imageblt(3) interface was originally designed for the
       Cirrus chipsets. Then Mach32 added support too but has problems to resemble the unintuitive Cirrus interface. Then  these  new  ideas  were
       reinjected  and vga_accel(3) was designed. Now Cirrus and Chips & Technologies chipset give limited vga_accel(3) support but no longer this
       old style support.  Mach32 is left to use the unintuitive Cirrus interface. At some future point the functions might be	added  for  Mach32
       too (which should be rather simple), so new applications should use the newer and probably more efficient interface.

       It would be fatal if the accelerator would be used while the console is switched away.  You should use vga_lockvc(3) and vga_unlockvc(3) to
       avoid this, although good implementations of the accelerator functions (like Mach32) will already ensure that.

       The testaccel(6) demo utilizes the old style accelerator functions.

SEE ALSO
       svgalib(7), vgagl(7), libvga.config(5), testaccel(6), vga_accel(3), vga_blitwait(3), vga_fillblt(3), vga_hlinelistblt(3),  vga_imageblt(3),
       vga_getmodeinfo(3), vga_lockvc(3), vga_unlockvc(3)

AUTHOR
       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. 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 (>;= 1.2.11)						   27 July 1997 						     vga_bitblt(3)