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[NTVDM]
Implement VGA panning. svn path=/trunk/; revision=67938
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@ -1059,9 +1059,11 @@ static VOID VgaUpdateFramebuffer(VOID)
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{
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SHORT i, j, k;
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DWORD AddressSize = VgaGetAddressSize();
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DWORD Address = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG],
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VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG]);
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DWORD ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
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BYTE PresetRowScan = VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] & 0x1F;
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DWORD Address = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG],
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VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG])
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+ ((VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] >> 5) & 3);
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/*
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* If console framebuffer is NULL, that means something went wrong
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@ -1075,6 +1077,7 @@ static VOID VgaUpdateFramebuffer(VOID)
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/* Graphics mode */
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PBYTE GraphicsBuffer = (PBYTE)ConsoleFramebuffer;
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DWORD InterlaceHighBit = VGA_INTERLACE_HIGH_BIT;
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SHORT X, Y;
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/*
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* Synchronize access to the graphics framebuffer
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@ -1097,6 +1100,10 @@ static VOID VgaUpdateFramebuffer(VOID)
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Address |= InterlaceHighBit;
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}
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/* Apply the preset row scan */
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Y = i - PresetRowScan;
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if (Y < 0) Y += CurrResolution.Y;
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/* Loop through the pixels */
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for (j = 0; j < CurrResolution.X; j++)
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{
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@ -1216,58 +1223,71 @@ static VOID VgaUpdateFramebuffer(VOID)
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: 0);
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}
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/* Apply horizontal pixel panning */
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if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
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{
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X = j - ((VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F) >> 1);
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}
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else
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{
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X = j - (VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F);
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}
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/* Wrap around */
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if (X < 0) X += CurrResolution.X;
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/* Take into account DoubleVision mode when checking for pixel updates */
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if (DoubleWidth && DoubleHeight)
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{
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/* Now check if the resulting pixel data has changed */
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if (GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] != PixelData)
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if (GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2)] != PixelData)
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{
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/* Yes, write the new value */
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GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] = PixelData;
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GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
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GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2)] = PixelData;
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GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
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GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2)] = PixelData;
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GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2 + 1)] = PixelData;
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GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X * 2) + (X * 2)] = PixelData;
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GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X * 2) + (X * 2 + 1)] = PixelData;
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/* Mark the specified pixel as changed */
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VgaMarkForUpdate(i, j);
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VgaMarkForUpdate(Y, X);
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}
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}
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else if (DoubleWidth && !DoubleHeight)
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{
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/* Now check if the resulting pixel data has changed */
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if (GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] != PixelData)
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if (GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2)] != PixelData)
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{
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/* Yes, write the new value */
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GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] = PixelData;
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GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
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GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2)] = PixelData;
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GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2 + 1)] = PixelData;
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/* Mark the specified pixel as changed */
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VgaMarkForUpdate(i, j);
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VgaMarkForUpdate(Y, X);
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}
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}
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else if (!DoubleWidth && DoubleHeight)
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{
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/* Now check if the resulting pixel data has changed */
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if (GraphicsBuffer[(i * 2 * CurrResolution.X) + j] != PixelData)
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if (GraphicsBuffer[(Y * 2 * CurrResolution.X) + X] != PixelData)
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{
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/* Yes, write the new value */
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GraphicsBuffer[(i * 2 * CurrResolution.X) + j] = PixelData;
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GraphicsBuffer[((i * 2 + 1) * CurrResolution.X) + j] = PixelData;
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GraphicsBuffer[(Y * 2 * CurrResolution.X) + X] = PixelData;
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GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X) + X] = PixelData;
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/* Mark the specified pixel as changed */
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VgaMarkForUpdate(i, j);
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VgaMarkForUpdate(Y, X);
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}
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}
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else // if (!DoubleWidth && !DoubleHeight)
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{
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/* Now check if the resulting pixel data has changed */
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if (GraphicsBuffer[i * CurrResolution.X + j] != PixelData)
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if (GraphicsBuffer[Y * CurrResolution.X + X] != PixelData)
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{
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/* Yes, write the new value */
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GraphicsBuffer[i * CurrResolution.X + j] = PixelData;
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GraphicsBuffer[Y * CurrResolution.X + X] = PixelData;
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/* Mark the specified pixel as changed */
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VgaMarkForUpdate(i, j);
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VgaMarkForUpdate(Y, X);
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}
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}
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}
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@ -1298,6 +1318,12 @@ static VOID VgaUpdateFramebuffer(VOID)
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PCHAR_CELL CharBuffer = (PCHAR_CELL)ConsoleFramebuffer;
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CHAR_CELL CharInfo;
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/*
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* Technically, the horizontal panning and preset row count should
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* affect text mode too. However, it works on pixels and not characters,
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* so we can't support it currently.
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*/
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/* Loop through the scanlines */
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for (i = 0; i < CurrResolution.Y; i++)
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{
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