svidtune.c

linux 下svgalib编的一个界面程序示例

/* Program to test the svgalib keyboard functions. */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <vga.h>
#include <vgagl.h>
#include <vgakeyboard.h>

void usage(void)
{
    puts("Usage: svidtune [mode]\n"
    );
    exit(2);
}

void main(int argc, char **argv)
{
    int x=-1,xmax,ymax;
    char buffer[2];
    int vgamode;
    int key, retval = 0;
    int pixelClock;
    int HDisplay;
    int HSyncStart;
    int HSyncEnd;
    int HTotal;
    int VDisplay;
    int VSyncStart;
    int VSyncEnd;
    int VTotal;
    int flags;
    float hsf,vsf;
    char flagstring[256];

    if (argc > 2)
	usage();
    if(argc==2){
       	if(!sscanf(argv[1], "%d", &x))
	  usage();
    };

    vga_init();
    if(x==-1)vgamode = vga_getdefaultmode(); else vgamode=x;
    if (vgamode == -1)
	vgamode = G640x480x256;

    if (!vga_hasmode(vgamode)) {
	printf("Mode not available.\n");
	exit(1);
    }

    vga_setmode(vgamode);
    gl_setcontextvga(vgamode);
    gl_enableclipping();
    gl_setfont(8, 8, gl_font8x8);
    gl_setwritemode(FONT_COMPRESSED + WRITEMODE_OVERWRITE);
    gl_setfontcolors(0, vga_white());

    buffer[1] = 0;
    for(;!buffer[1];) {
        vga_getcurrenttiming(&pixelClock, 
           		     &HDisplay,		
           		     &HSyncStart,
                             &HSyncEnd,
                             &HTotal,
                             &VDisplay,
                             &VSyncStart,
                             &VSyncEnd,
                             &VTotal,
                             &flags);
        
        sprintf(flagstring,"%s%s%s%s%s%s",
                flags&1?"+hsync ":"",
                flags&2?"-hsync ":"",
                flags&4?"+vsync ":"",
                flags&8?"-vsync ":"",
                flags&16?"interlaced ":"",
                flags&32?"doublescan":"");

        hsf=pixelClock*1000.0/HTotal;
        vsf=hsf/VTotal;
        if(flags&32)vsf=vsf/2;

	gl_printf(500,500,"铤