NAME

       vga_hlinelistblt - draw horizontal scan lines

SYNOPSIS

       #include <vga.h>

       void vga_hlinelistblt(int ymin, int n, int *xmin, int *xmax , int pitch, int c);

DESCRIPTION

       *xmin and *xmax are pointers to arrays of n integers.  There are n horizontal lines drawn,
       for i in 0 .. (n - 1) a horizontal line will be drawn from pixel (xmin[i], ymin  +  i)  to
       (xmax[i],  ymin  +  i)  using  color  c.   Pixel (0,0) is considered to be at the absolute
       beginning of the SVGA memory.  (as if vga_setdisplaystart(0) was called)

       This is an old style function to access the accelerator of an SVGA card. Before calling it
       you   should   check   for  availability  of  the  function  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_bitblt(3),
       vga_blitwait(3),        vga_fillblt(3),        vga_imageblt(3),        vga_getmodeinfo(3),
       vga_setdisplaystart(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.