Category : Files from Magazines
Archive   : CUJ9309.ZIP
Filename : 1109048A

Listing 5 Manipulating the DIB Color Table


void BuildMapping (struct BitMapRec FAR *dispRec)
{
int e,i;
DWORD colorRef;

for (i = 0; i < 256; i++)
{
if (options & PAL_MAPDIRECT)
{
e = i;

if (options & PAL_LOWERCONTRAST)
{
if (i < 32) e = i * 3;
else if (i >= 224) e = (i * 3) - 512;
else e = ((i - 32) / 3) + 96;
}
else if (options & PAL_HIGHERCONTRAST)
{
if (i < 96) e = i / 3;
else if (i >= 160)
e = ((i - 160) / 3) + 224;
else e = ((i - 96) * 3) + 32;
}

if (options & PAL_DARKER)
{
e = e / 2;
}
else if (options & PAL_LIGHTER)
{
e = (e / 2) + 128;
}

e = e & 0x00FF; /* "safety"... */
}
else {
colorRef = (DWORD)i +
((DWORD)i << 8L) +
((DWORD)i << 16L);
e = GetNearestPaletteIndex(newPalette,
colorRef);
}

/*--------------------------------------------*/

if (options & PAL_IMAGEINVERT)
dispRec->bmi.bmiColors[i] = e;
else dispRec->bmi.bmiColors[255-i] = e;
} /* end for i */
} /* BuildMapping */