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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_hlinelist-
       blt(3),	and  vga_imageblt(3) interface was originally designed for the
       Cirrus chipsets.	Then Mach32 added support too but has problems to  re-
       semble  the  unintuitive	 Cirrus	 interface.  Then these	new ideas were
       reinjected and vga_accel(3) was designed. Now Cirrus and	Chips &	 Tech-
       nologies	 chipset  give limited vga_accel(3) support but	no longer this
       old style support.  Mach32 is left to use the unintuitive Cirrus	inter-
       face.  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-es-
       sen.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)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHOR

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