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PDCursesMod/dos/pdcscrn.c

708 lines
16 KiB
C
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/* PDCurses */
#include "pdcdos.h"
#include <stdlib.h>
int pdc_adapter; /* screen type */
int pdc_scrnmode; /* default screen mode */
int pdc_font; /* default font size */
bool pdc_direct_video; /* allow direct screen memory writes */
bool pdc_bogus_adapter; /* TRUE if adapter has insane values */
unsigned pdc_video_seg; /* video base segment */
unsigned pdc_video_ofs; /* video base offset */
static short realtocurs[16] =
{
COLOR_BLACK, COLOR_BLUE, COLOR_GREEN, COLOR_CYAN, COLOR_RED,
COLOR_MAGENTA, COLOR_YELLOW, COLOR_WHITE, COLOR_BLACK + 8,
COLOR_BLUE + 8, COLOR_GREEN + 8, COLOR_CYAN + 8, COLOR_RED + 8,
COLOR_MAGENTA + 8, COLOR_YELLOW + 8, COLOR_WHITE + 8
};
short pdc_curstoreal[16];
static bool sizeable = FALSE; /* TRUE if adapter is resizeable */
static unsigned short *saved_screen = NULL;
static int saved_lines = 0;
static int saved_cols = 0;
static int saved_scrnmode[3];
static int saved_font[3];
/* Thanks to Jeff Duntemann, K16RA for providing the impetus
(through the Dr. Dobbs Journal, March 1989 issue) for getting
the routines below merged into Bjorn Larsson's PDCurses 1.3...
-- frotz@dri.com 900730 */
/* _get_font() - Get the current font size */
static int _get_font(void)
{
int retval;
retval = getdosmemword(0x485);
/* Assume the MDS Genius is in 66 line mode. */
if ((retval == 0) && (pdc_adapter == _MDS_GENIUS))
retval = _FONT15;
switch (pdc_adapter)
{
case _MDA:
retval = 10; /* POINTS is not certain on MDA/Hercules */
break;
case _EGACOLOR:
case _EGAMONO:
switch (retval)
{
case _FONT8:
case _FONT14:
break;
default:
retval = _FONT14;
}
break;
case _CGA:
retval = _FONT8;
}
return retval;
}
/* _set_font() - Sets the current font size, if the adapter allows such a
change. It is an error to attempt to change the font size on a
"bogus" adapter. The reason for this is that we have a known video
adapter identity problem. e.g. Two adapters report the same identifying
characteristics. */
static void _set_font(int size)
{
PDCREGS regs;
if (pdc_bogus_adapter)
return;
switch (pdc_adapter)
{
case _CGA:
case _MDA:
case _MCGACOLOR:
case _MCGAMONO:
case _MDS_GENIUS:
break;
case _EGACOLOR:
case _EGAMONO:
if (sizeable && (pdc_font != size))
{
switch (size)
{
case _FONT8:
regs.W.ax = 0x1112;
regs.h.bl = 0x00;
PDCINT(0x10, regs);
break;
case _FONT14:
regs.W.ax = 0x1111;
regs.h.bl = 0x00;
PDCINT(0x10, regs);
}
}
break;
case _VGACOLOR:
case _VGAMONO:
if (sizeable && (pdc_font != size))
{
switch (size)
{
case _FONT8:
regs.W.ax = 0x1112;
regs.h.bl = 0x00;
PDCINT(0x10, regs);
break;
case _FONT14:
regs.W.ax = 0x1111;
regs.h.bl = 0x00;
PDCINT(0x10, regs);
break;
case _FONT16:
regs.W.ax = 0x1114;
regs.h.bl = 0x00;
PDCINT(0x10, regs);
}
}
}
curs_set(SP->visibility);
pdc_font = _get_font();
}
/* _set_80x25() - force a known screen state: 80x25 text mode. Forces the
appropriate 80x25 alpha mode given the display adapter. */
static void _set_80x25(void)
{
PDCREGS regs;
switch (pdc_adapter)
{
case _CGA:
case _EGACOLOR:
case _EGAMONO:
case _VGACOLOR:
case _VGAMONO:
case _MCGACOLOR:
case _MCGAMONO:
regs.h.ah = 0x00;
regs.h.al = 0x03;
PDCINT(0x10, regs);
break;
case _MDA:
regs.h.ah = 0x00;
regs.h.al = 0x07;
PDCINT(0x10, regs);
}
}
/* _get_scrn_mode() - Return the current BIOS video mode */
static int _get_scrn_mode(void)
{
PDCREGS regs;
regs.h.ah = 0x0f;
PDCINT(0x10, regs);
return (int)regs.h.al;
}
/* _set_scrn_mode() - Sets the BIOS Video Mode Number only if it is
different from the current video mode. */
static void _set_scrn_mode(int new_mode)
{
PDCREGS regs;
if (_get_scrn_mode() != new_mode)
{
regs.h.ah = 0;
regs.h.al = (unsigned char) new_mode;
PDCINT(0x10, regs);
}
pdc_font = _get_font();
pdc_scrnmode = new_mode;
LINES = PDC_get_rows();
COLS = PDC_get_columns();
}
/* _sanity_check() - A video adapter identification sanity check. This
routine will force sane values for various control flags. */
static int _sanity_check(int adapter)
{
int fontsize = _get_font();
int rows = PDC_get_rows();
PDC_LOG(("_sanity_check() - called: Adapter %d\n", adapter));
switch (adapter)
{
case _EGACOLOR:
case _EGAMONO:
switch (rows)
{
case 25:
case 43:
break;
default:
pdc_bogus_adapter = TRUE;
}
switch (fontsize)
{
case _FONT8:
case _FONT14:
break;
default:
pdc_bogus_adapter = TRUE;
}
break;
case _VGACOLOR:
case _VGAMONO:
break;
case _CGA:
case _MDA:
case _MCGACOLOR:
case _MCGAMONO:
switch (rows)
{
case 25:
break;
default:
pdc_bogus_adapter = TRUE;
}
break;
default:
pdc_bogus_adapter = TRUE;
}
if (pdc_bogus_adapter)
{
sizeable = FALSE;
pdc_direct_video = FALSE;
}
return adapter;
}
/* _query_adapter_type() - Determine PC video adapter type. */
static int _query_adapter_type(void)
{
PDCREGS regs;
int retval = _NONE;
/* thanks to paganini@ax.apc.org for the GO32 fix */
#if !defined(__DJGPP__) && !defined(__WATCOMC__)
struct SREGS segs;
#endif
short video_base = getdosmemword(0x463);
PDC_LOG(("_query_adapter_type() - called\n"));
/* attempt to call VGA Identify Adapter Function */
regs.W.ax = 0x1a00;
PDCINT(0x10, regs);
if ((regs.h.al == 0x1a) && (retval == _NONE))
{
/* We know that the PS/2 video BIOS is alive and well. */
switch (regs.h.al)
{
case 0:
retval = _NONE;
break;
case 1:
retval = _MDA;
break;
case 2:
retval = _CGA;
break;
case 4:
retval = _EGACOLOR;
sizeable = TRUE;
break;
case 5:
retval = _EGAMONO;
break;
case 26: /* ...alt. VGA BIOS... */
case 7:
retval = _VGACOLOR;
sizeable = TRUE;
break;
case 8:
retval = _VGAMONO;
break;
case 10:
case 13:
retval = _MCGACOLOR;
break;
case 12:
retval = _MCGAMONO;
break;
default:
retval = _CGA;
}
}
else
{
/* No VGA BIOS, check for an EGA BIOS by selecting an
Alternate Function Service...
bx == 0x0010 --> return EGA information */
regs.h.ah = 0x12;
regs.W.bx = 0x10;
PDCINT(0x10, regs);
if ((regs.h.bl != 0x10) && (retval == _NONE))
{
/* An EGA BIOS exists */
regs.h.ah = 0x12;
regs.h.bl = 0x10;
PDCINT(0x10, regs);
if (regs.h.bh == 0)
retval = _EGACOLOR;
else
retval = _EGAMONO;
}
else if (retval == _NONE)
{
/* Now we know we only have CGA or MDA */
PDCINT(0x11, regs);
switch (regs.h.al & 0x30)
{
case 0x10:
case 0x20:
retval = _CGA;
break;
case 0x30:
retval = _MDA;
break;
default:
retval = _NONE;
}
}
}
if (video_base == 0x3d4)
{
pdc_video_seg = 0xb800;
switch (retval)
{
case _EGAMONO:
retval = _EGACOLOR;
break;
case _VGAMONO:
retval = _VGACOLOR;
}
}
if (video_base == 0x3b4)
{
pdc_video_seg = 0xb000;
switch (retval)
{
case _EGACOLOR:
retval = _EGAMONO;
break;
case _VGACOLOR:
retval = _VGAMONO;
}
}
if ((retval == _NONE)
#ifndef CGA_DIRECT
|| (retval == _CGA)
#endif
)
pdc_direct_video = FALSE;
if ((unsigned)pdc_video_seg == 0xb000)
SP->mono = TRUE;
else
SP->mono = FALSE;
/* Check for DESQview shadow buffer
thanks to paganini@ax.apc.org for the GO32 fix */
#ifndef __WATCOMC__
regs.h.ah = 0xfe;
regs.h.al = 0;
regs.x.di = pdc_video_ofs;
# ifdef __DJGPP__
regs.x.es = pdc_video_seg;
__dpmi_int(0x10, &regs);
pdc_video_seg = regs.x.es;
# else
segs.es = pdc_video_seg;
int86x(0x10, &regs, &regs, &segs);
pdc_video_seg = segs.es;
# endif
pdc_video_ofs = regs.x.di;
#endif
if (!pdc_adapter)
pdc_adapter = retval;
return _sanity_check(retval);
}
/* close the physical screen -- may restore the screen to its state
before PDC_scr_open(); miscellaneous cleanup */
void PDC_scr_close(void)
{
#if SMALL || MEDIUM
struct SREGS segregs;
int ds;
#endif
PDC_LOG(("PDC_scr_close() - called\n"));
if( saved_screen)
{
#ifdef __DJGPP__
dosmemput(saved_screen, saved_lines * saved_cols * 2,
(unsigned long)_FAR_POINTER(pdc_video_seg,
pdc_video_ofs));
#else
# if (SMALL || MEDIUM)
segread(&segregs);
ds = segregs.ds;
movedata(ds, (int)saved_screen, pdc_video_seg, pdc_video_ofs,
(saved_lines * saved_cols * 2));
# else
memcpy((void *)_FAR_POINTER(pdc_video_seg, pdc_video_ofs),
(void *)saved_screen, (saved_lines * saved_cols * 2));
# endif
#endif
}
reset_shell_mode();
if (SP->visibility != 1)
curs_set(1);
/* Position cursor to the bottom left of the screen. */
PDC_gotoyx(PDC_get_rows() - 2, 0);
}
void PDC_scr_free(void)
{
if( saved_screen)
free(saved_screen);
saved_screen = NULL;
}
/* open the physical screen -- miscellaneous initialization, may save
the existing screen for later restoration */
int PDC_scr_open(void)
{
#if SMALL || MEDIUM
struct SREGS segregs;
int ds;
#endif
int i;
PDC_LOG(("PDC_scr_open() - called\n"));
for (i = 0; i < 16; i++)
pdc_curstoreal[realtocurs[i]] = i;
SP->orig_attr = FALSE;
pdc_direct_video = TRUE; /* Assume that we can */
pdc_video_seg = 0xb000; /* Base screen segment addr */
pdc_video_ofs = 0x0; /* Base screen segment ofs */
pdc_adapter = _query_adapter_type();
pdc_scrnmode = _get_scrn_mode();
pdc_font = _get_font();
SP->lines = PDC_get_rows();
SP->cols = PDC_get_columns();
SP->mouse_wait = PDC_CLICK_PERIOD;
SP->audible = TRUE;
SP->termattrs = (SP->mono ? A_UNDERLINE : A_COLOR) | A_REVERSE | A_BLINK;
/* If the environment variable PDCURSES_BIOS is set, the DOS int10()
BIOS calls are used in place of direct video memory access. */
if (getenv("PDCURSES_BIOS"))
pdc_direct_video = FALSE;
/* This code for preserving the current screen. */
if (getenv("PDC_RESTORE_SCREEN"))
{
saved_lines = PDC_get_rows();
saved_cols = PDC_get_columns();
saved_screen = malloc(saved_lines * saved_cols * 2);
if (!saved_screen)
{
SP->_preserve = FALSE;
return OK;
}
#ifdef __DJGPP__
dosmemget((unsigned long)_FAR_POINTER(pdc_video_seg, pdc_video_ofs),
saved_lines * saved_cols * 2, saved_screen);
#else
# if SMALL || MEDIUM
segread(&segregs);
ds = segregs.ds;
movedata(pdc_video_seg, pdc_video_ofs, ds, (int)saved_screen,
(saved_lines * saved_cols * 2));
# else
memcpy((void *)saved_screen,
(void *)_FAR_POINTER(pdc_video_seg, pdc_video_ofs),
(saved_lines * saved_cols * 2));
# endif
#endif
}
SP->_preserve = (getenv("PDC_PRESERVE_SCREEN") != NULL);
return OK;
}
/* the core of resize_term() */
int PDC_resize_screen(int nlines, int ncols)
{
PDC_LOG(("PDC_resize_screen() - called. Lines: %d Cols: %d\n",
nlines, ncols));
INTENTIONALLY_UNUSED_PARAMETER( ncols);
if( !stdscr) /* We're trying to specify an initial screen size */
{ /* before calling initscr(). This works on some */
return OK; /* some platforms, but not this one. */
}
/* Trash the stored value of orig_cursor -- it's only good if the
video mode doesn't change */
SP->orig_cursor = 0x0607;
switch (pdc_adapter)
{
case _EGACOLOR:
if (nlines >= 43)
_set_font(_FONT8);
else
_set_80x25();
break;
case _VGACOLOR:
if (nlines > 28)
_set_font(_FONT8);
else
if (nlines > 25)
_set_font(_FONT14);
else
_set_80x25();
}
PDC_set_blink(COLORS == 8);
return OK;
}
void PDC_reset_prog_mode(void)
{
PDC_LOG(("PDC_reset_prog_mode() - called.\n"));
}
void PDC_reset_shell_mode(void)
{
PDC_LOG(("PDC_reset_shell_mode() - called.\n"));
}
void PDC_restore_screen_mode(int i)
{
if (i >= 0 && i <= 2)
{
pdc_font = _get_font();
_set_font(saved_font[i]);
if (_get_scrn_mode() != saved_scrnmode[i])
_set_scrn_mode(saved_scrnmode[i]);
}
}
void PDC_save_screen_mode(int i)
{
if (i >= 0 && i <= 2)
{
saved_font[i] = pdc_font;
saved_scrnmode[i] = pdc_scrnmode;
}
}
/* _egapal() - Find the EGA palette value (0-63) for the color (0-15).
On VGA, this is an index into the DAC. */
static short _egapal(short color)
{
PDCREGS regs;
regs.W.ax = 0x1007;
regs.h.bl = pdc_curstoreal[color];
PDCINT(0x10, regs);
return regs.h.bh;
}
bool PDC_can_change_color(void)
{
return (pdc_adapter == _VGACOLOR);
}
/* These are only valid when pdc_adapter == _VGACOLOR */
int PDC_color_content(int color, int *red, int *green, int *blue)
{
PDCREGS regs;
/* Read single DAC register */
regs.W.ax = 0x1015;
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);
return OK;
}
int PDC_init_color(int color, int red, int green, int blue)
{
PDCREGS regs;
/* 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.W.ax = 0x1010;
regs.W.bx = _egapal(color);
PDCINT(0x10, regs);
return OK;
}
/* Does nothing in the DOS (or OS/2 or Win32 console) flavors of PDCurses,
which lack user resizing. See X11 or Win32a versions of this function for
details of what it does on platforms that do support user resizing. */
void PDC_set_resize_limits( const int new_min_lines, const int new_max_lines,
const int new_min_cols, const int new_max_cols)
{
INTENTIONALLY_UNUSED_PARAMETER( new_min_lines);
INTENTIONALLY_UNUSED_PARAMETER( new_max_lines);
INTENTIONALLY_UNUSED_PARAMETER( new_min_cols);
INTENTIONALLY_UNUSED_PARAMETER( new_max_cols);
}
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