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hicolor.c
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C/C++ Source or Header
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1992-07-05
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4KB
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220 lines
#include <dos.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <pc.h>
#include "hicolor.h"
/* CONSTANTS */
#define bytesPerPixel 2
#define INFORM_PROG_NAME "hiview"
#define PAGESIZE (64L*1024L)
/* GLOBALS */
int i;
void
himode ()
{
union REGS regs;
regs.x.ax = 0x10f0;
regs.x.bx = 0x30;
regs.x.cx = 0;
regs.x.dx = 0;
int86 (0x10, ®s, ®s);
}
void
Textmode ()
{
union REGS regs;
regs.x.ax = 0x03;
regs.x.bx = 0x0;
regs.x.cx = 0;
regs.x.dx = 0;
int86 (0x10, ®s, ®s);
}
void
Putpixel (x, y, r, g, b)
int x, y;
char r, g, b;
{
union REGS regs;
if (x < 800 && y < 600)
{
regs.h.ah = 0x0c;
regs.h.al = ((g & 7) << 5) + (b & 31);
regs.x.bx = 0;
regs.x.cx = 2 * x;
regs.x.dx = y;
int86 (0x10, ®s, ®s);
regs.h.ah = 0x0c;
regs.h.al = ((g & 24) >> 3) + ((r & 31) << 2);
regs.x.bx = 0;
regs.x.cx = 2 * x + 1;
regs.x.dx = y;
int86 (0x10, ®s, ®s);
}
}
/*
main()
{
int i, j;
char r, g, b;
int d1, d2, d3;
himode();
for ( j=0; j<800; j+= 1 )
for ( i=0; i<600; i+=1 )
{
d1 = (int)sqrt( (double)i*(double)i + (double)j*(double)j );
d2 = (int)sqrt( (double)(j-800)*(double)(j-800) + (double)i*(double)i );
d3 = (int)sqrt( (double)(i-600)*(double)(i-600) + (double)(j-400)*(double)(j-400) );
r = ((d1/8)%32);
g = ((d2/8)%32);
b = ((d3/8)%32);
Putpixel(j, i, r, g, b );
}
printf("I'm finished.\n");
getch();
Textmode();
printf("Hello, World!\n");
getch();
}
*/
/*
NAME
PutVideoRow30H - display a row in High-Color mode 30h (800x600x32K)
*/
void
PutVideoRow30H (
int startRow, /* location to start display */
int startCol, /* location to start display */
int length, /* number of pixels to display */
WORD * buffer /* data to be displayed */
)
{
static
ulong bytesPerRow = 800 * bytesPerPixel;
uint length0;
uint length1;
ulong lOffset;
uint offset;
int page;
static
ulong pagesize = 64L * 1024L;
uint segment;
unsigned short *videoptr;
/* calculate video page and offset */
lOffset = (ulong) startRow *bytesPerRow +
(ulong) (startCol * bytesPerPixel);
videoptr = (unsigned short *) (0xd0200000 + lOffset);
memcpy (videoptr, buffer, 2 * length);
#ifdef OLDBRUCE
page = (int) (lOffset / pagesize);
SetVideoPage (page);
segment = 0xA000;
offset = (uint) (lOffset % pagesize);
/* display row, possibly in two parts, if it spills over page boundary */
length *= bytesPerPixel; /* converts length units from pixels to bytes */
length0 = (uint) (pagesize - (ulong) offset);
length1 = length - length0;
if ((ulong) offset + (ulong) length < pagesize)
{
/*
movedata(FP_SEG(buffer), FP_OFF(buffer), segment, offset, length);
*/
}
else
{
/*
movedata(FP_SEG(buffer), FP_OFF(buffer), segment, offset, length0);
*/
SetVideoPage (page + 1);
/* in next line, have to divide length0 by 2 because it is units */
/* of bytes, and buffer is a word pointer */
/*
movedata(FP_SEG(buffer), FP_OFF(buffer + length0 / 2), segment, 0, length1);
*/
}
#endif
}
void
SetHicolorMode (int mode)
{
union REGS inregs;
union REGS outregs;
inregs.h.ah = 0x10;
inregs.h.al = 0xF0;
inregs.h.bl = (unsigned char) mode;
int86 (0x10, &inregs, &outregs);
if (outregs.h.ah != 0)
{
SetVideoMode (0x03);
InformFatal ("failed to set High-Color mode");
}
}
void
SetVideoMode (int mode)
{
union REGS inregs;
union REGS outregs;
inregs.h.ah = 0;
inregs.h.al = (unsigned char) mode;
int86 (0x10, &inregs, &outregs);
}
/*
NAME
SetVideoPage - set read/write video memory page on Tseng ET4000
*/
void
SetVideoPage (int page)
{
outportb (0x03CD, (char) page);
}
/*
NAME
InformFatal - print an error message and exit
*/
void
InformFatal (char *fmt,...)
{
va_list args;
va_start (args, fmt);
fprintf (stderr, "\n%s: ", INFORM_PROG_NAME);
(void) vfprintf (stderr, fmt, args);
fprintf (stderr, "\n");
va_end (args);
exit (1);
}