home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1993, 1994 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* gdevevga.c */
- /* IBM PC EGA and VGA display drivers */
- /* All of the real code is in gdevpcfb.c. */
- #include "memory_.h"
- #include "gx.h"
- #include "gserrors.h"
- #include "gxdevice.h"
- #include "gdevpcfb.h"
-
- /* ------ Internal routines ------ */
-
- /* We can't catch signals.... */
- void
- pcfb_set_signals(gx_device *dev)
- {
- }
-
- /* Read the device state */
- void
- pcfb_get_state(pcfb_bios_state *pbs)
- { registers regs;
- regs.h.ah = 0xf;
- int86(0x10, ®s, ®s);
- pbs->display_mode = regs.h.al;
- pbs->text_page = regs.h.bh;
- regs.h.ah = 0x3;
- int86(0x10, ®s, ®s);
- pbs->text_cursor_mode = regs.rshort.cx;
- regs.rshort.ax = 0x1130;
- regs.h.bh = 0;
- int86(0x10, ®s, ®s);
- switch ( regs.rshort.cx )
- {
- case 0x08: pbs->text_font = 0x1112; break; /* 8 x 8 */
- case 0x10: pbs->text_font = 0x1114; break; /* 8 x 16 */
- default: pbs->text_font = 0x1111; /* 8 x 14 */
- }
- regs.h.ah = 0x8;
- regs.h.bh = pbs->text_page;
- int86(0x10, ®s, ®s);
- pbs->text_attribute = regs.h.ah;
- pbs->border_color = (regs.h.ah >> 4);
- regs.rshort.ax = 0x1a00;
- int86(0x10, ®s, ®s);
- if ( regs.h.al == 0x1a && regs.h.bl == 0x8 )
- { regs.rshort.ax = 0x1008;
- int86(0x10, ®s, ®s);
- pbs->border_color = regs.h.bh;
- }
- if ( pbs->display_mode != 3 )
- { pbs->display_mode = 3;
- pbs->text_font = 0x1112;
- pbs->text_cursor_mode = 0x0607;
- pbs->text_attribute = 7;
- pbs->text_page = 0;
- }
- }
-
- /* Set the device mode */
- void
- pcfb_set_mode(int mode)
- { registers regs;
- regs.h.ah = 0;
- regs.h.al = mode;
- int86(0x10, ®s, ®s);
- }
-
- /* Restore the device state */
- void
- pcfb_set_state(const pcfb_bios_state *pbs)
- { registers regs;
- pcfb_set_mode(pbs->display_mode);
- regs.rshort.ax = 0x500; /* force display of page 0 */
- int86(0x10, ®s, ®s);
- regs.rshort.ax = pbs->text_font;
- regs.h.bl = 0;
- int86(0x10, ®s, ®s);
- regs.h.ah = 0x3;
- regs.h.bh = 0;
- int86(0x10, ®s, ®s); /* Get cursor to reset MCGA */
- regs.h.al = pbs->text_page;
- regs.h.ah = 0x5;
- int86(0x10, ®s, ®s);
- regs.rshort.cx = pbs->text_cursor_mode;
- regs.h.ah = 0x1;
- int86(0x10, ®s, ®s);
- regs.rshort.ax = 0x1001;
- regs.h.bh = pbs->border_color;
- int86(0x10, ®s, ®s);
- }
-