VARCem/PDCurses
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Common EGA palette check to egapal(); comments.

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This commit is contained in:
William McBrine
2006-10-01 01:09:33 +00:00
parent 482b1b8066
commit cb36178ecd
1 changed files with 29 additions and 17 deletions
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46
dos/pdcscrn.c
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@@ -24,7 +24,7 @@
# include <sys/movedata.h>
#endif
RCSID("$Id: pdcscrn.c,v 1.57 2006/09/30 15:45:04 wmcbrine Exp $");
RCSID("$Id: pdcscrn.c,v 1.58 2006/10/01 01:09:33 wmcbrine Exp $");
int pdc_adapter; /* screen type */
int pdc_scrnmode; /* default screen mode */
@@ -713,6 +713,22 @@ void PDC_save_screen_mode(int i)
#define DIVROUND(num, divisor) ((num) + ((divisor) >> 1)) / (divisor);
/* egapal() - Find the EGA palette value (0-63) for the color (0-15).
On VGA, this is an index into the DAC. */
static int egapal(int color)
{
PDCREGS regs;
regs.h.ah = 0x10;
regs.h.al = 0x07;
regs.h.bl = color;
PDCINT(0x10, regs);
return regs.h.bh;
}
bool PDC_can_change_color(void)
{
return (pdc_adapter == _VGACOLOR);
@@ -724,18 +740,16 @@ int PDC_color_content(short color, short *red, short *green, short *blue)
{
PDCREGS regs;
regs.h.ah = 0x10;
regs.h.al = 0x07;
regs.h.bl = color;
PDCINT(0x10, regs);
/* Read single DAC register */
regs.h.ah = 0x10;
regs.h.al = 0x15;
regs.h.bl = regs.h.bh;
regs.h.bl = egapal(color);
PDCINT(0x10, regs);
/* Scale and store */
*red = DIVROUND((unsigned)(regs.h.dh) * 1000, 63);
*green = DIVROUND((unsigned)(regs.h.ch) * 1000, 63);
*blue = DIVROUND((unsigned)(regs.h.cl) * 1000, 63);
@@ -752,21 +766,19 @@ int PDC_init_color(short color, short red, short green, short blue)
{
PDCREGS regs;
regs.h.ah = 0x10;
regs.h.al = 0x07;
regs.h.bl = color;
PDCINT(0x10, regs);
regs.h.ah = 0x10;
regs.h.al = 0x10;
regs.h.bl = regs.h.bh;
regs.h.bh = 0;
/* Scale */
regs.h.dh = DIVROUND((unsigned)red * 63, 1000);
regs.h.ch = DIVROUND((unsigned)green * 63, 1000);
regs.h.cl = DIVROUND((unsigned)blue * 63, 1000);
/* Set single DAC register */
regs.h.ah = 0x10;
regs.h.al = 0x10;
regs.h.bl = egapal(color);
regs.h.bh = 0;
PDCINT(0x10, regs);
return OK;