public override IImage Clone()
{
ImageInt32 img = new ImageInt32(this.Width, this.Height);
img.CloneFrom(this);
return(img);
}
public unsafe ImageInt32 ToImageInt32()
{
ImageInt32 img32 = new ImageInt32(this.Width, this.Height);
Byte * start = this.Start;
Byte * end = this.Start + this.Length;
Int32 * dst = img32.Start;
while (start != end)
{
*dst = *start;
start++;
dst++;
}
return(img32);
}
public unsafe ImageInt32 ToGrayscaleImageInt32(double rCoeff, double gCoeff, double bCoeff)
{
ImageInt32 img = new ImageInt32(this.Width, this.Height);
Rgb24 * p = Start;
Int32 * to = img.Start;
Rgb24 * end = p + Length;
if (Length < 1024)
{
while (p != end)
{
*to = (Byte)(p->Red * rCoeff + p->Green * gCoeff + p->Blue * bCoeff);
p++;
to++;
}
}
else
{
int *bCache = stackalloc int[256];
int *gCache = stackalloc int[256];
int *rCache = stackalloc int[256];
const int shift = 1 << 10;
int rShift = (int)(rCoeff * shift);
int gShift = (int)(gCoeff * shift);
int bShift = shift - rShift - gShift;
int r = 0, g = 0, b = 0;
for (int i = 0; i < 256; i++)
{
bCache[i] = b;
gCache[i] = g;
rCache[i] = r;
b += bShift;
g += gShift;
r += rShift;
}
while (p != end)
{
*to = (Byte)((bCache[p->Red] + gCache[p->Green] + rCache[p->Red]) >> 10);
p++;
to++;
}
}
return(img);
}
