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[NTVDM]: simplify code and add a reference link concerning the CrtColorPaletteMask mask.

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svn path=/trunk/; revision=64794
This commit is contained in:
Hermès Bélusca-Maïto 2014-10-17 22:27:34 +00:00
parent 60d3d2c399
commit fd8e3415c8
1 changed files with 9 additions and 8 deletions
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17
reactos/subsystems/ntvdm/bios/vidbios.c
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@ -2652,9 +2652,9 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
{
#ifdef DOSBOX
BYTE Index = getBL();
BYTE CrtColorPaletteMask = Bda->CrtColorPaletteMask;
CrtColorPaletteMask = (CrtColorPaletteMask & 0xE0) | (Index & 0x1F);
Bda->CrtColorPaletteMask = CrtColorPaletteMask;
/* See: http://www.bioscentral.com/misc/bda.htm */
Bda->CrtColorPaletteMask = (Bda->CrtColorPaletteMask & 0xE0) | (Index & 0x1F);
Index = ((Index << 1) & 0x10) | (Index & 0x7);
@ -2666,7 +2666,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
VgaSetSinglePaletteRegister(0x00, Index);
Index = (CrtColorPaletteMask & 0x10) | 0x02 | ((CrtColorPaletteMask & 0x20) >> 5);
Index = (Bda->CrtColorPaletteMask & 0x10) | 0x02 | ((Bda->CrtColorPaletteMask & 0x20) >> 5);
VgaSetSinglePaletteRegister(0x01, Index);
Index += 2;
@ -2687,14 +2687,15 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
case 0x01: /* Set Palette */
{
BYTE Index = getBL();
BYTE CrtColorPaletteMask = Bda->CrtColorPaletteMask;
CrtColorPaletteMask = (CrtColorPaletteMask & 0xDF) | ((Index & 1) ? 0x20 : 0x0);
Bda->CrtColorPaletteMask = CrtColorPaletteMask;
/* See: http://www.bioscentral.com/misc/bda.htm */
/* Reset bit 5: foreground colors index (0: green/red/yellow; 1: cyan/magenta/white) */
Bda->CrtColorPaletteMask = (Bda->CrtColorPaletteMask & 0xDF) | ((Index & 1) ? 0x20 : 0x00);
/* Don't set any extra colors when in text mode */
if (Bda->VideoMode <= 3) break;
Index = (CrtColorPaletteMask & 0x10) | 0x02 | Index;
Index = (Bda->CrtColorPaletteMask & 0x10) | 0x02 | Index;
VgaSetSinglePaletteRegister(0x01, Index);
Index += 2;