vga_hlinelistblt man page on aLinux

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vga_hlinelistblt(3)	      Svgalib User Manual	   vga_hlinelistblt(3)

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 hor‐
       izontal	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 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
       resemble 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_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.

Svgalib (>= 1.2.11)		 27 July 1997		   vga_hlinelistblt(3)
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