[aandrejevic] 67942: [NTVDM] Implement panning by moving the addressing coordinates up instead of moving the display coordinates down.
28 May
2015
28 May
'15
3:45 p.m.
Author: aandrejevic
Date: Thu May 28 15:45:40 2015
New Revision: 67942
URL: http://svn.reactos.org/svn/reactos?rev=67942&view=rev
Log:
[NTVDM]
Implement panning by moving the addressing coordinates up instead
of moving the display coordinates down.
Modified:
trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c
Modified: trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/hard…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c [iso-8859-1] Thu May 28
15:45:40 2015
@@ -1063,6 +1063,7 @@
BYTE PresetRowScan = VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] & 0x1F;
DWORD Address = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG],
VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG])
+ + PresetRowScan * ScanlineSize
+ ((VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] >> 5) &
3);
/*
@@ -1077,7 +1078,7 @@
/* Graphics mode */
PBYTE GraphicsBuffer = (PBYTE)ConsoleFramebuffer;
DWORD InterlaceHighBit = VGA_INTERLACE_HIGH_BIT;
- SHORT X, Y;
+ SHORT X;
/*
* Synchronize access to the graphics framebuffer
@@ -1100,15 +1101,21 @@
Address |= InterlaceHighBit;
}
- /* Apply the preset row scan */
- Y = i - PresetRowScan;
- if (Y < 0) Y += CurrResolution.Y;
-
/* Loop through the pixels */
for (j = 0; j < CurrResolution.X; j++)
{
BYTE PixelData = 0;
+ /* Apply horizontal pixel panning */
+ if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
+ {
+ X = j + ((VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F)
>> 1);
+ }
+ else
+ {
+ X = j + (VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F);
+ }
+
/* Check the shifting mode */
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFT256)
{
@@ -1118,20 +1125,20 @@
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
/* One byte per pixel */
- PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
- + LOWORD((Address + (j / VGA_NUM_BANKS))
+ PixelData = VgaMemory[(X % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ + LOWORD((Address + (X / VGA_NUM_BANKS))
* AddressSize)];
}
else
{
/* 4-bits per pixel */
- PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
- + LOWORD((Address + (j / (VGA_NUM_BANKS *
2)))
+ PixelData = VgaMemory[(X % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ + LOWORD((Address + (X / (VGA_NUM_BANKS *
2)))
* AddressSize)];
/* Check if we should use the highest 4 bits or lowest 4 */
- if (((j / VGA_NUM_BANKS) % 2) == 0)
+ if (((X / VGA_NUM_BANKS) % 2) == 0)
{
/* Highest 4 */
PixelData >>= 4;
@@ -1157,14 +1164,14 @@
* 2 bits shifted from plane 0 and 2 for the first 4 pixels,
* then 2 bits shifted from plane 1 and 3 for the next 4
*/
- DWORD BankNumber = (j / 4) % 2;
- DWORD Offset = Address + (j / 8);
+ DWORD BankNumber = (X / 4) % 2;
+ DWORD Offset = Address + (X / 8);
BYTE LowPlaneData = VgaMemory[BankNumber * VGA_BANK_SIZE +
LOWORD(Offset * AddressSize)];
BYTE HighPlaneData = VgaMemory[(BankNumber + 2) * VGA_BANK_SIZE +
LOWORD(Offset * AddressSize)];
/* Extract the two bits from each plane */
- LowPlaneData = (LowPlaneData >> (6 - ((j % 4) * 2)))
& 0x03;
- HighPlaneData = (HighPlaneData >> (6 - ((j % 4) * 2)))
& 0x03;
+ LowPlaneData = (LowPlaneData >> (6 - ((X % 4) * 2)))
& 0x03;
+ HighPlaneData = (HighPlaneData >> (6 - ((X % 4) * 2)))
& 0x03;
/* Combine them into the pixel */
PixelData = LowPlaneData | (HighPlaneData << 2);
@@ -1183,11 +1190,11 @@
{
/* The data is on plane k, 4 pixels per byte */
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
- + LOWORD((Address + (j /
VGA_NUM_BANKS))
+ + LOWORD((Address + (X /
VGA_NUM_BANKS))
* AddressSize)];
/* The mask of the first bit in the pair */
- BYTE BitMask = 1 << (((3 - (j % VGA_NUM_BANKS)) * 2) +
1);
+ BYTE BitMask = 1 << (((3 - (X % VGA_NUM_BANKS)) * 2) +
1);
/* Bits 0, 1, 2 and 3 come from the first bit of the pair */
if (PlaneData & BitMask) PixelData |= 1 << k;
@@ -1203,11 +1210,11 @@
for (k = 0; k < VGA_NUM_BANKS; k++)
{
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
- + LOWORD((Address + (j /
(VGA_NUM_BANKS * 2)))
+ + LOWORD((Address + (X /
(VGA_NUM_BANKS * 2)))
* AddressSize)];
/* If the bit on that plane is set, set it */
- if (PlaneData & (1 << (7 - (j % 8)))) PixelData |=
1 << k;
+ if (PlaneData & (1 << (7 - (X % 8)))) PixelData |=
1 << k;
}
}
}
@@ -1223,71 +1230,58 @@
: 0);
}
- /* Apply horizontal pixel panning */
- if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
- {
- X = j - ((VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F)
>> 1);
- }
- else
- {
- X = j - (VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F);
- }
-
- /* Wrap around */
- if (X < 0) X += CurrResolution.X;
-
/* Take into account DoubleVision mode when checking for pixel updates
*/
if (DoubleWidth && DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
- if (GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2)] !=
PixelData)
+ if (GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] !=
PixelData)
{
/* Yes, write the new value */
- GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2)] =
PixelData;
- GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2 + 1)] =
PixelData;
- GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X * 2) + (X * 2)] =
PixelData;
- GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X * 2) + (X * 2 +
1)] = PixelData;
+ GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] =
PixelData;
+ GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2 + 1)] =
PixelData;
+ GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2)] =
PixelData;
+ GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2 +
1)] = PixelData;
/* Mark the specified pixel as changed */
- VgaMarkForUpdate(Y, X);
+ VgaMarkForUpdate(i, j);
}
}
else if (DoubleWidth && !DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
- if (GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2)] !=
PixelData)
+ if (GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] !=
PixelData)
{
/* Yes, write the new value */
- GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2)] =
PixelData;
- GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2 + 1)] =
PixelData;
+ GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] =
PixelData;
+ GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2 + 1)] =
PixelData;
/* Mark the specified pixel as changed */
- VgaMarkForUpdate(Y, X);
+ VgaMarkForUpdate(i, j);
}
}
else if (!DoubleWidth && DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
- if (GraphicsBuffer[(Y * 2 * CurrResolution.X) + X] != PixelData)
+ if (GraphicsBuffer[(i * 2 * CurrResolution.X) + j] != PixelData)
{
/* Yes, write the new value */
- GraphicsBuffer[(Y * 2 * CurrResolution.X) + X] = PixelData;
- GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X) + X] =
PixelData;
+ GraphicsBuffer[(i * 2 * CurrResolution.X) + j] = PixelData;
+ GraphicsBuffer[((i * 2 + 1) * CurrResolution.X) + j] =
PixelData;
/* Mark the specified pixel as changed */
- VgaMarkForUpdate(Y, X);
+ VgaMarkForUpdate(i, j);
}
}
else // if (!DoubleWidth && !DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
- if (GraphicsBuffer[Y * CurrResolution.X + X] != PixelData)
+ if (GraphicsBuffer[i * CurrResolution.X + j] != PixelData)
{
/* Yes, write the new value */
- GraphicsBuffer[Y * CurrResolution.X + X] = PixelData;
+ GraphicsBuffer[i * CurrResolution.X + j] = PixelData;
/* Mark the specified pixel as changed */
- VgaMarkForUpdate(Y, X);
+ VgaMarkForUpdate(i, j);
}
}
}
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