void PLSubBmp::Create( PLBmpBase & SrcBmp, const PLRect & SrcRect) {
PLASSERT (!m_pLineArray);
int bpp = SrcBmp.GetBitsPerPixel();
if (bpp <= 8)
m_pClrTab = new PLPixel32[(int)(1 << bpp)];
else
m_pClrTab = NULL;
initLocals (SrcRect.Width(), SrcRect.Height(), SrcBmp.GetPixelFormat());
if (bpp <= 8)
SetPalette (SrcBmp.GetPalette());
m_pLineArray = new PLBYTE * [m_Size.y];
PLBYTE** ppSrcLines = SrcBmp.GetLineArray();
int XOfs = SrcRect.tl.x*(bpp/8);
for (int y=0; y<m_Size.y; y++)
m_pLineArray[y] = ppSrcLines[SrcRect.tl.y+y]+XOfs;
PLASSERT_VALID(this);
}
void applyMultiplicationMap (PLBmp & textureBmp, const PLBmp & attnBmp,
const PLRect & srcRect, double myLightingFactor)
{
assert(attnBmp.GetBitsPerPixel() == 8);
assert(textureBmp.GetBitsPerPixel() == 32);
assert (srcRect.Width() > 0 && srcRect.Height() > 0);
double Scale = double(srcRect.Width())/textureBmp.GetWidth();
double YScale = double(srcRect.Height())/textureBmp.GetHeight();
assert (Scale == YScale); (void)YScale;
PLBYTE ** myAttnBmpLines = attnBmp.GetLineArray();
PLPixel32 ** myTextureBmpLines = (PLPixel32**)textureBmp.GetLineArray();
if (Scale > 0.99) {
for (int y=0;y<textureBmp.GetHeight(); y++) {
for (int x=0;x<textureBmp.GetWidth(); x++) {
PLPixel32& col = myTextureBmpLines[y][x];
PLBYTE myScale;
myScale = PLBYTE(myAttnBmpLines[int(Scale*y+srcRect.tl.y)]
[int(Scale*x+srcRect.tl.x)]);
int tempIntR = int((myLightingFactor * col.GetR() * myScale)/256);
int tempIntG = int((myLightingFactor * col.GetG() * myScale)/256);
int tempIntB = int((myLightingFactor * col.GetB() * myScale)/256);
col.Set( static_cast<PLBYTE>(min(tempIntR,255)),
static_cast<PLBYTE>(min(tempIntG,255)),
static_cast<PLBYTE>(min(tempIntB,255)), 255 );
}
}
} else {
int MaxY = attnBmp.GetHeight()-1;
int MaxX = attnBmp.GetWidth()-1;
for (int y=0;y<textureBmp.GetHeight(); y++) {
double ySrcPos = Scale*y+srcRect.tl.y;
int yLightPos = int (ySrcPos);
double yLightFade = fmod (ySrcPos, 1);
if (yLightPos >= MaxY) {
yLightPos = MaxY - 1;
yLightFade = 1;
}
for (int x=0;x<textureBmp.GetWidth(); x++) {
PLPixel32& col = myTextureBmpLines[y][x];
double xSrcPos = Scale*x+srcRect.tl.x;
int xLightPos = int (xSrcPos);
double xLightFade = fmod (xSrcPos, 1);
if (xLightPos >= MaxX) {
xLightPos = MaxX - 1;
xLightFade = 1;
}
double myScale = double(myAttnBmpLines[yLightPos][xLightPos])*
(1-xLightFade)*(1-yLightFade) +
double(myAttnBmpLines[yLightPos][xLightPos+1])*
xLightFade*(1-yLightFade) +
double(myAttnBmpLines[yLightPos+1][xLightPos])*
(1-xLightFade)*yLightFade +
double(myAttnBmpLines[yLightPos+1][xLightPos+1])*
xLightFade*yLightFade;
int tempIntR = int((myLightingFactor * col.GetR() * myScale) /256);
int tempIntG = int((myLightingFactor * col.GetG() * myScale) /256);
int tempIntB = int((myLightingFactor * col.GetB() * myScale) /256);
col.Set( static_cast<PLBYTE>(min(tempIntR,255)),
static_cast<PLBYTE>(min(tempIntG,255)),
static_cast<PLBYTE>(min(tempIntB,255)),
255);
}
}
}
}
