public ImageData Clone()
{
ImageData cb = new ImageData();
cb.A = (byte[,])_alpha.Clone();
cb.B = (byte[,])_blue.Clone();
cb.G = (byte[,])_green.Clone();
cb.R = (byte[,])_red.Clone();
return cb;
}
private Bitmap getTransformedBitmap()
{
if (srcH == 0 || srcW == 0) return null;
ImageData destCB = new ImageData();
destCB.A = new byte[rect.Width, rect.Height];
destCB.B = new byte[rect.Width, rect.Height];
destCB.G = new byte[rect.Width, rect.Height];
destCB.R = new byte[rect.Width, rect.Height];
PointF ptInPlane = new PointF();
int x1, x2, y1, y2;
double dab, dbc, dcd, dda;
float dx1, dx2, dy1, dy2, dx1y1, dx1y2, dx2y1, dx2y2, nbyte;
for (int y = 0; y < rect.Height; y++)
{
for (int x = 0; x < rect.Width; x++)
{
Point srcPt = new Point(x, y);
srcPt.Offset(this.rect.Location);
if (isOnPlaneABCD(srcPt))
{
dab = Math.Abs(Vector.CrossProduct(new Vector(srcPt.X - vertex[0].X, srcPt.Y - vertex[0].Y), AB));
dbc = Math.Abs(Vector.CrossProduct(new Vector(srcPt.X - vertex[1].X, srcPt.Y - vertex[1].Y), BC));
dcd = Math.Abs(Vector.CrossProduct(new Vector(srcPt.X - vertex[2].X, srcPt.Y - vertex[2].Y), CD));
dda = Math.Abs(Vector.CrossProduct(new Vector(srcPt.X - vertex[3].X, srcPt.Y - vertex[3].Y), DA));
ptInPlane.X = (float)(srcW * (dda / (dda + dbc)));
ptInPlane.Y = (float)(srcH * (dab / (dab + dcd)));
x1 = (int)ptInPlane.X;
y1 = (int)ptInPlane.Y;
if (x1 >= 0 && x1 < srcW && y1 >= 0 && y1 < srcH)
{
if (isBilinear)
{
x2 = (x1 == srcW - 1) ? x1 : x1 + 1;
y2 = (y1 == srcH - 1) ? y1 : y1 + 1;
dx1 = ptInPlane.X - (float)x1;
if (dx1 < 0) dx1 = 0;
dx1 = 1f - dx1;
dx2 = 1f - dx1;
dy1 = ptInPlane.Y - (float)y1;
if (dy1 < 0) dy1 = 0;
dy1 = 1f - dy1;
dy2 = 1f - dy1;
dx1y1 = dx1 * dy1;
dx1y2 = dx1 * dy2;
dx2y1 = dx2 * dy1;
dx2y2 = dx2 * dy2;
nbyte = srcCB.A[x1, y1] * dx1y1 + srcCB.A[x2, y1] * dx2y1 + srcCB.A[x1, y2] * dx1y2 + srcCB.A[x2, y2] * dx2y2;
destCB.A[x, y] = (byte)nbyte;
nbyte = srcCB.B[x1, y1] * dx1y1 + srcCB.B[x2, y1] * dx2y1 + srcCB.B[x1, y2] * dx1y2 + srcCB.B[x2, y2] * dx2y2;
destCB.B[x, y] = (byte)nbyte;
nbyte = srcCB.G[x1, y1] * dx1y1 + srcCB.G[x2, y1] * dx2y1 + srcCB.G[x1, y2] * dx1y2 + srcCB.G[x2, y2] * dx2y2;
destCB.G[x, y] = (byte)nbyte;
nbyte = srcCB.R[x1, y1] * dx1y1 + srcCB.R[x2, y1] * dx2y1 + srcCB.R[x1, y2] * dx1y2 + srcCB.R[x2, y2] * dx2y2;
destCB.R[x, y] = (byte)nbyte;
}
else
{
destCB.A[x, y] = srcCB.A[x1, y1];
destCB.B[x, y] = srcCB.B[x1, y1];
destCB.G[x, y] = srcCB.G[x1, y1];
destCB.R[x, y] = srcCB.R[x1, y1];
}
}
}
}
}
return destCB.ToBitmap();
}
