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[NTVDM]

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Factor the shift of the interlaced high bit out of the for(...) loop (since the interlaced high bit is not modified anymore after), and add extra parentheses.

svn path=/trunk/; revision=63209
This commit is contained in:
Hermès Bélusca-Maïto 2014-05-09 22:07:49 +00:00
parent d34fb08d13
commit b9cff19fca
1 changed files with 8 additions and 9 deletions
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17
reactos/subsystems/ntvdm/hardware/vga.c
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@ -1136,6 +1136,7 @@ static VOID VgaUpdateFramebuffer(VOID)
{ {
/* Graphics mode */ /* Graphics mode */
PBYTE GraphicsBuffer = (PBYTE)ConsoleFramebuffer; PBYTE GraphicsBuffer = (PBYTE)ConsoleFramebuffer;
DWORD InterlaceHighBit = VGA_INTERLACE_HIGH_BIT;
/* /*
* Synchronize access to the graphics framebuffer * Synchronize access to the graphics framebuffer
@ -1143,17 +1144,15 @@ static VOID VgaUpdateFramebuffer(VOID)
*/ */
WaitForSingleObject(ConsoleMutex, INFINITE); WaitForSingleObject(ConsoleMutex, INFINITE);
/* Shift the high bit right by 1 in odd/even mode */
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
InterlaceHighBit >>= 1;
}
/* Loop through the scanlines */ /* Loop through the scanlines */
for (i = 0; i < Resolution.Y; i++) for (i = 0; i < Resolution.Y; i++)
{ {
DWORD InterlaceHighBit = VGA_INTERLACE_HIGH_BIT;
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
/* Shift the high bit right by 1 in odd/even mode */
InterlaceHighBit >>= 1;
}
if ((VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_OE) && (i & 1)) if ((VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_OE) && (i & 1))
{ {
/* Odd-numbered line in interlaced mode - set the high bit */ /* Odd-numbered line in interlaced mode - set the high bit */
@ -1309,7 +1308,7 @@ static VOID VgaUpdateFramebuffer(VOID)
} }
} }
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_OE && (i & 1)) if ((VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_OE) && (i & 1))
{ {
/* Clear the high bit */ /* Clear the high bit */
Address &= ~InterlaceHighBit; Address &= ~InterlaceHighBit;