static VOID
NTAPI
BootImageFadeIn(VOID)
{
UCHAR PaletteBitmapBuffer[sizeof(BITMAPINFOHEADER) + sizeof(_MainPalette)];
PBITMAPINFOHEADER PaletteBitmap = (PBITMAPINFOHEADER)PaletteBitmapBuffer;
LPRGBQUAD Palette = (LPRGBQUAD)(PaletteBitmapBuffer + sizeof(BITMAPINFOHEADER));
ULONG Iteration, Index, ClrUsed;
LARGE_INTEGER Interval;
Interval.QuadPart = -PALETTE_FADE_TIME;
/* Check if we're installed and we own it */
if ((InbvBootDriverInstalled) &&
(InbvDisplayState == INBV_DISPLAY_STATE_OWNED))
{
/* Acquire the lock */
InbvAcquireLock();
/*
* Build a bitmap containing the fade in palette. The palette entries
* are then processed in a loop and set using VidBitBlt function.
*/
ClrUsed = sizeof(_MainPalette) / sizeof(_MainPalette[0]);
RtlZeroMemory(PaletteBitmap, sizeof(BITMAPINFOHEADER));
PaletteBitmap->biSize = sizeof(BITMAPINFOHEADER);
PaletteBitmap->biBitCount = 4;
PaletteBitmap->biClrUsed = ClrUsed;
/*
* Main animation loop.
*/
for (Iteration = 0; Iteration <= PALETTE_FADE_STEPS; ++Iteration)
{
for (Index = 0; Index < ClrUsed; Index++)
{
Palette[Index].rgbRed = (UCHAR)
(_MainPalette[Index].rgbRed * Iteration / PALETTE_FADE_STEPS);
Palette[Index].rgbGreen = (UCHAR)
(_MainPalette[Index].rgbGreen * Iteration / PALETTE_FADE_STEPS);
Palette[Index].rgbBlue = (UCHAR)
(_MainPalette[Index].rgbBlue * Iteration / PALETTE_FADE_STEPS);
}
VidBitBlt(PaletteBitmapBuffer, 0, 0);
/* Wait for a bit. */
KeDelayExecutionThread(KernelMode, FALSE, &Interval);
}
/* Release the lock */
InbvReleaseLock();
/* Wait for a bit. */
KeDelayExecutionThread(KernelMode, FALSE, &Interval);
}
}
VOID
NTAPI
InbvBitBlt(IN PUCHAR Buffer,
IN ULONG X,
IN ULONG Y)
{
/* Check if we're installed and we own it */
if ((InbvBootDriverInstalled) &&
(InbvDisplayState == INBV_DISPLAY_STATE_OWNED))
{
/* Acquire the lock */
InbvAcquireLock();
/* Do the blit */
VidBitBlt(Buffer, X, Y);
/* Release the lock */
InbvReleaseLock();
}
}
