uint16 Physics::GetMaskBits(std::vector<std::string> layerNames,GLboolean isColliding)
{
uint16 mask=0;
for(int i =0 ;i<layerNames.size();++i)
{
mask |=GetMaskBits(layerNames[i],isColliding);
}
if(isColliding)
return mask;
return ~mask;
}
HRESULT CImgBitsDIB::ComputeTransMask(LONG yFirst, LONG cLines, LONG lTrans, LONG lReplace)
{
DWORD* pdw;
DWORD dwBits;
BYTE* pb;
int cb;
int cbPad;
int x, y, b;
BYTE bTrans;
Assert(_iBitCount == 8);
if(lTrans < 0)
{
Assert(!_pvMaskBits);
return S_OK;
}
// negate coordinate system for DIBs
yFirst = _yHeight - cLines - yFirst;
// Step 1: scan for transparent bits: if none, there's nothing to do (yet)
bTrans = lTrans;
if(!_pvMaskBits)
{
pb = (BYTE*)GetBits() + CbLine()*yFirst;
cbPad = CbLine() - _xWidth;
for(y=cLines; y-->0; pb+=cbPad)
{
for(x=_xWidth; x-->0; )
{
if(*pb++ == bTrans)
{
HRESULT hr = AllocMask();
if(hr)
{
RRETURN(hr);
}
goto trans;
}
}
}
return S_OK;
}
trans:
// Step 2: allocate and fill in the one-bit mask
pdw = (DWORD*)((BYTE*)GetBits() + CbLine()*yFirst);
pb = (BYTE*)GetMaskBits() + CbLineMask()*yFirst;
cbPad = CbLineMask() - (_xWidth+7)/8;
for(y=cLines; y-->0; pb+=cbPad)
{
for(x=_xWidth; x>0; x-=8)
{
dwBits = *pdw++; b = 0;
b |= ((BYTE)dwBits != bTrans); b <<= 1; dwBits >>= 8;
b |= ((BYTE)dwBits != bTrans); b <<= 1; dwBits >>= 8;
b |= ((BYTE)dwBits != bTrans); b <<= 1; dwBits >>= 8;
b |= ((BYTE)dwBits != bTrans); b <<= 1;
if(x <= 4)
{
b = (b << 3) | 0xF;
}
else
{
dwBits = *pdw++;
b |= ((BYTE)dwBits != bTrans); b <<= 1; dwBits >>= 8;
b |= ((BYTE)dwBits != bTrans); b <<= 1; dwBits >>= 8;
b |= ((BYTE)dwBits != bTrans); b <<= 1; dwBits >>= 8;
b |= ((BYTE)dwBits != bTrans);
}
*pb++ = (BYTE)b;
}
}
// Step 3: replace the transparent color
if(lTrans != lReplace)
{
for(pb=(BYTE*)GetBits()+CbLine()*yFirst,cb=CbLine()*cLines; cb; pb+=1,cb-=1)
{
if(*pb == bTrans)
{
*pb = lReplace;
}
}
}
return S_OK;
}
