ULONG
NTAPI
PALETTE_ulGetNearestIndex(PALETTE* ppal, ULONG ulColor)
{
if (ppal->flFlags & PAL_INDEXED) // use fl & PALINDEXED
return PALETTE_ulGetNearestPaletteIndex(ppal, ulColor);
else
return PALETTE_ulGetNearestBitFieldsIndex(ppal, ulColor);
}
UINT
APIENTRY
NtGdiGetNearestPaletteIndex(
HPALETTE hpal,
COLORREF crColor)
{
PPALETTE ppal = PALETTE_ShareLockPalette(hpal);
UINT index = 0;
if (ppal)
{
if (ppal->flFlags & PAL_INDEXED)
{
/* Return closest match for the given RGB color */
index = PALETTE_ulGetNearestPaletteIndex(ppal, crColor);
}
// else SetLastError ?
PALETTE_ShareUnlockPalette(ppal);
}
return index;
}
COLORREF APIENTRY NtGdiGetNearestColor(HDC hDC, COLORREF Color)
{
COLORREF nearest = CLR_INVALID;
PDC dc;
PPALETTE palGDI;
LONG RBits, GBits, BBits;
dc = DC_LockDc(hDC);
if (NULL != dc)
{
HPALETTE hpal = dc->dclevel.hpal;
palGDI = PALETTE_ShareLockPalette(hpal);
if (!palGDI)
{
DC_UnlockDc(dc);
return nearest;
}
if (palGDI->flFlags & PAL_INDEXED)
{
ULONG index;
index = PALETTE_ulGetNearestPaletteIndex(palGDI, Color);
nearest = PALETTE_ulGetRGBColorFromIndex(palGDI, index);
}
else if (palGDI->flFlags & PAL_RGB || palGDI->flFlags & PAL_BGR)
{
nearest = Color;
}
else if (palGDI->flFlags & PAL_BITFIELDS)
{
RBits = 8 - GetNumberOfBits(palGDI->RedMask);
GBits = 8 - GetNumberOfBits(palGDI->GreenMask);
BBits = 8 - GetNumberOfBits(palGDI->BlueMask);
nearest = RGB(
(GetRValue(Color) >> RBits) << RBits,
(GetGValue(Color) >> GBits) << GBits,
(GetBValue(Color) >> BBits) << BBits);
}
