1vga_hlinelistblt(3) Svgalib User Manual vga_hlinelistblt(3)
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6 vga_hlinelistblt - draw horizontal scan lines
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9 #include <vga.h>
10 void vga_hlinelistblt(int ymin, int n, int *xmin, int *xmax , int
12 pitch, int c);
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16 *xmin and *xmax are pointers to arrays of n integers. There are n hor‐
17 izontal lines drawn, for i in 0 .. (n - 1) a horizontal line will be
18 drawn from pixel (xmin[i], ymin + i) to (xmax[i], ymin + i) using color
19 c. Pixel (0,0) is considered to be at the absolute beginning of the
20 SVGA memory. (as if vga_setdisplaystart(0) was called)
21 This is an old style function to access the accelerator of an SVGA
23 card. Before calling it you should check for availability of the func‐
24 tion in the mode you use with vga_getmodeinfo(3).
25 For new applications you might be better of trying to use vga_accel(3)
27 instead.
28 The old vga_bitblt(3), vga_blitwait(3), vga_fillblt(3), vga_hlinelist‐
30 blt(3), and vga_imageblt(3) interface was originally designed for the
31 Cirrus chipsets. Then Mach32 added support too but has problems to
32 resemble the unintuitive Cirrus interface. Then these new ideas were
33 reinjected and vga_accel(3) was designed. Now Cirrus and Chips & Tech‐
34 nologies chipset give limited vga_accel(3) support but no longer this
35 old style support. Mach32 is left to use the unintuitive Cirrus inter‐
36 face. At some future point the functions might be added for Mach32 too
37 (which should be rather simple), so new applications should use the
38 newer and probably more efficient interface.
39 It would be fatal if the accelerator would be used while the console is
41 switched away. You should use vga_lockvc(3) and vga_unlockvc(3) to
42 avoid this, although good implementations of the accelerator functions
43 (like Mach32) will already ensure that.
44 The testaccel(6) demo utilizes the old style accelerator functions.
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49 svgalib(7), vgagl(7), libvga.config(5), testaccel(6), vga_accel(3),
50 vga_bitblt(3), vga_blitwait(3), vga_fillblt(3), vga_imageblt(3),
51 vga_getmodeinfo(3), vga_setdisplaystart(3), vga_lockvc(3),
52 vga_unlockvc(3)
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56 This manual page was edited by Michael Weller <eowmob@exp-math.uni-
57 essen.de>. The exact source of the referenced function as well as of
58 the original documentation is unknown.
59 It is very likely that both are at least to some extent are due to Harm
61 Hanemaayer <H.Hanemaayer@inter.nl.net>.
62 Occasionally this might be wrong. I hereby asked to be excused by the
64 original author and will happily accept any additions or corrections to
65 this first version of the svgalib manual.
66Svgalib (>= 1.2.11) 27 July 1997 vga_hlinelistblt(3)