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fix VESA_ScanLineLength subcall 1;

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improve some vesa mode detection a bit


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2473
This commit is contained in:
Sebastian Strohhäcker 2006-02-07 20:12:27 +00:00
parent 734c9856e1
commit 17e0c0b8c5
1 changed files with 8 additions and 5 deletions
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13
src/ints/int10_vesa.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: int10_vesa.cpp,v 1.20 2006-02-02 17:57:08 harekiet Exp $ */
/* $Id: int10_vesa.cpp,v 1.21 2006-02-07 20:12:27 c2woody Exp $ */
#include <string.h>
#include <stddef.h>
@ -127,6 +127,7 @@ Bit8u VESA_GetSVGAModeInformation(Bit16u mode,Bit16u seg,Bit16u off) {
Bitu i=0;
if (mode<0x100) return 0x01;
mode&=0xfff;
while (ModeList_VGA[i].mode!=0xffff) {
if (mode==ModeList_VGA[i].mode) goto foundit; else i++;
}
@ -319,10 +320,12 @@ Bit8u VESA_ScanLineLength(Bit8u subcall,Bit16u val, Bit16u & bytes,Bit16u & pixe
default:
return 0x1; //Illegal call
}
/* Write the scan line to video card the simple way */
if (vga.config.scan_len & 7)
vga.config.scan_len += 8;
vga.config.scan_len /= 8;
if (subcall!=0x01) {
/* Write the scan line to video card the simple way */
if (vga.config.scan_len & 7)
vga.config.scan_len += 8;
vga.config.scan_len /= 8;
}
pixels=(vga.config.scan_len*8)/bpp;
bytes=vga.config.scan_len*8;
lines = 2*1024*1024 / bytes;