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[NTVDM]

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For better visibility, double the screen size if the resolution is too low.


svn path=/branches/ntvdm/; revision=60888
This commit is contained in:
Aleksandar Andrejevic 2013-11-08 21:56:30 +00:00
parent 3a1ae6ee3b
commit da4af40329
2 changed files with 44 additions and 6 deletions
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48
subsystems/ntvdm/vga.c
View file

@ -92,6 +92,7 @@ static HANDLE TextConsoleBuffer = NULL;
static HANDLE GraphicsConsoleBuffer = NULL;
static HANDLE ConsoleMutex = NULL;
static HPALETTE PaletteHandle = NULL;
static BOOLEAN DoubleVision = FALSE;
static BYTE VgaLatchRegisters[VGA_NUM_BANKS] = {0, 0, 0, 0};
static BYTE VgaMiscRegister;
@ -440,6 +441,13 @@ static BOOL VgaEnterGraphicsMode(PCOORD Resolution)
LPBITMAPINFO BitmapInfo = (LPBITMAPINFO)BitmapInfoBuffer;
LPWORD PaletteIndex = (LPWORD)(BitmapInfo->bmiColors);
if ((Resolution->X < VGA_MINIMUM_WIDTH) && (Resolution->Y < VGA_MINIMUM_HEIGHT))
{
DoubleVision = TRUE;
Resolution->X *= 2;
Resolution->Y *= 2;
}
/* Fill the bitmap info header */
ZeroMemory(&BitmapInfo->bmiHeader, sizeof(BITMAPINFOHEADER));
BitmapInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
@ -500,6 +508,7 @@ static VOID VgaLeaveGraphicsMode(VOID)
ConsoleMutex = NULL;
CloseHandle(GraphicsConsoleBuffer);
GraphicsConsoleBuffer = NULL;
DoubleVision = FALSE;
}
static BOOL VgaEnterTextMode(PCOORD Resolution)
@ -738,14 +747,32 @@ static VOID VgaUpdateFramebuffer(VOID)
PixelData = VgaAcRegisters[PixelData];
}
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[i * Resolution.X + j] != PixelData)
if (DoubleVision)
{
/* Yes, write the new value */
GraphicsBuffer[i * Resolution.X + j] = PixelData;
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[(i * Resolution.X * 4) + (j * 2)] != PixelData)
{
/* Yes, write the new value */
GraphicsBuffer[(i * Resolution.X * 4) + (j * 2)] = PixelData;
GraphicsBuffer[(i * Resolution.X * 4) + (j * 2 + 1)] = PixelData;
GraphicsBuffer[((i * 2 + 1) * Resolution.X * 2) + (j * 2)] = PixelData;
GraphicsBuffer[((i * 2 + 1) * Resolution.X * 2) + (j * 2 + 1)] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(i, j);
/* Mark the specified pixel as changed */
VgaMarkForUpdate(i, j);
}
}
else
{
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[i * Resolution.X + j] != PixelData)
{
/* Yes, write the new value */
GraphicsBuffer[i * Resolution.X + j] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(i, j);
}
}
}
@ -954,6 +981,15 @@ VOID VgaRefreshDisplay(VOID)
&UpdateRectangle);
}
if (DoubleVision)
{
/* Scale the update rectangle */
UpdateRectangle.Left *= 2;
UpdateRectangle.Top *= 2;
UpdateRectangle.Right = UpdateRectangle.Right * 2 + 1;
UpdateRectangle.Bottom = UpdateRectangle.Bottom * 2 + 1;
}
/* Redraw the screen */
InvalidateConsoleDIBits(ConsoleBufferHandle, &UpdateRectangle);

2
subsystems/ntvdm/vga.h
View file

@ -38,6 +38,8 @@
#define VGA_MAX_COLORS 256
#define VGA_PALETTE_SIZE (VGA_MAX_COLORS * 3)
#define VGA_BITMAP_INFO_SIZE (sizeof(BITMAPINFOHEADER) + 2 * (VGA_PALETTE_SIZE / 3))
#define VGA_MINIMUM_WIDTH 400
#define VGA_MINIMUM_HEIGHT 300
#define VGA_DAC_TO_COLOR(x) (((x) << 2) | ((x) >> 6))
#define VGA_COLOR_TO_DAC(x) ((x) >> 2)