public static unsafe ColorBgra GetBilinearSampleWrapped(this ImageSurface src, ColorBgra *srcDataPtr, int srcWidth, int srcHeight, float x, float y)
{
if (!Utility.IsNumber(x) || !Utility.IsNumber(y))
{
return(ColorBgra.Transparent);
}
float u = x;
float v = y;
unchecked {
int iu = (int)Math.Floor(u);
uint sxfrac = (uint)(256 * (u - (float)iu));
uint sxfracinv = 256 - sxfrac;
int iv = (int)Math.Floor(v);
uint syfrac = (uint)(256 * (v - (float)iv));
uint syfracinv = 256 - syfrac;
uint wul = (uint)(sxfracinv * syfracinv);
uint wur = (uint)(sxfrac * syfracinv);
uint wll = (uint)(sxfracinv * syfrac);
uint wlr = (uint)(sxfrac * syfrac);
int sx = iu;
if (sx < 0)
{
sx = (srcWidth - 1) + ((sx + 1) % srcWidth);
}
else if (sx > (srcWidth - 1))
{
sx = sx % srcWidth;
}
int sy = iv;
if (sy < 0)
{
sy = (srcHeight - 1) + ((sy + 1) % srcHeight);
}
else if (sy > (srcHeight - 1))
{
sy = sy % srcHeight;
}
int sleft = sx;
int sright;
if (sleft == (srcWidth - 1))
{
sright = 0;
}
else
{
sright = sleft + 1;
}
int stop = sy;
int sbottom;
if (stop == (srcHeight - 1))
{
sbottom = 0;
}
else
{
sbottom = stop + 1;
}
ColorBgra cul = src.GetPointUnchecked(srcDataPtr, srcWidth, sleft, stop);
ColorBgra cur = src.GetPointUnchecked(srcDataPtr, srcWidth, sright, stop);
ColorBgra cll = src.GetPointUnchecked(srcDataPtr, srcWidth, sleft, sbottom);
ColorBgra clr = src.GetPointUnchecked(srcDataPtr, srcWidth, sright, sbottom);
ColorBgra c = ColorBgra.BlendColors4W16IP(cul, wul, cur, wur, cll, wll, clr, wlr);
return(c);
}
}
public static unsafe ColorBgra GetBilinearSampleClamped(this ImageSurface src, ColorBgra *srcDataPtr, int srcWidth, int srcHeight, float x, float y)
{
if (!Utility.IsNumber(x) || !Utility.IsNumber(y))
{
return(ColorBgra.Transparent);
}
float u = x;
float v = y;
if (u < 0)
{
u = 0;
}
else if (u > srcWidth - 1)
{
u = srcWidth - 1;
}
if (v < 0)
{
v = 0;
}
else if (v > srcHeight - 1)
{
v = srcHeight - 1;
}
unchecked {
int iu = (int)Math.Floor(u);
uint sxfrac = (uint)(256 * (u - (float)iu));
uint sxfracinv = 256 - sxfrac;
int iv = (int)Math.Floor(v);
uint syfrac = (uint)(256 * (v - (float)iv));
uint syfracinv = 256 - syfrac;
uint wul = (uint)(sxfracinv * syfracinv);
uint wur = (uint)(sxfrac * syfracinv);
uint wll = (uint)(sxfracinv * syfrac);
uint wlr = (uint)(sxfrac * syfrac);
int sx = iu;
int sy = iv;
int sleft = sx;
int sright;
if (sleft == (srcWidth - 1))
{
sright = sleft;
}
else
{
sright = sleft + 1;
}
int stop = sy;
int sbottom;
if (stop == (srcHeight - 1))
{
sbottom = stop;
}
else
{
sbottom = stop + 1;
}
ColorBgra *cul = src.GetPointAddressUnchecked(srcDataPtr, srcWidth, sleft, stop);
ColorBgra *cur = cul + (sright - sleft);
ColorBgra *cll = src.GetPointAddressUnchecked(srcDataPtr, srcWidth, sleft, sbottom);
ColorBgra *clr = cll + (sright - sleft);
ColorBgra c = ColorBgra.BlendColors4W16IP(*cul, wul, *cur, wur, *cll, wll, *clr, wlr);
return(c);
}
}