public static void BlendImages(ref ColorImage lower, ColorImage upper, Color c, int xc, int yc)
{
int xOffset = xc - upper.Width;
int yOffset = yc - upper.Height;
for (int y = 0; y < upper.Height; y++)
{
for (int x = 0; x < upper.Width; x++)
{
int lowerX = x + xOffset + 15;
int lowerY = y + yOffset + 15;
if ((lowerX > 0) && (lowerX < lower.Width) && (lowerY > 0) && (lowerY < lower.Height))
{
int upperR = upper.GetColor(x, y).R;
double alpha = upperR / 255.0;
double oneMinusAlpha = (1.0 - alpha);
Color lowerC = lower.GetColor(lowerX, lowerY);
int r = (int)((alpha * c.R) + (lowerC.R * oneMinusAlpha));
int g = (int)((alpha * c.G) + (lowerC.G * oneMinusAlpha));
int b = (int)((alpha * c.B) + (lowerC.B * oneMinusAlpha));
lower.SetColor(lowerX, lowerY, Color.FromArgb(r, g, b));
}
}
}
}
public ColorImage GenerateStrokeArea(Bitmap input, int s)
{
FastColorImage piece = new FastColorImage();
double m;
ArrayList list = new ArrayList();
double pixVal;
DateTime start = DateTime.Now;
//Bitmap img = new Bitmap(input.Width, input.Height);
ColorImage cImg = new ColorImage(input.Width, input.Height);
StreamWriter writer = null; //new StreamWriter("new.txt");
FastColorImage inMem = new FastColorImage(new UnsafeBitmap(input));
for (int i = 0; i < input.Height; i++)
{
for (int j = 0; j < input.Width; j++)
{
inMem.FastCrop(j, i, s, s, ref piece);
System.Drawing.Color topColor = inMem.GetColor(j, i);
m = Moment00(piece, topColor, writer);
pixVal = (255.0 * m / (piece.Width * piece.Height));
cImg.SetColor(j, i, Color.FromArgb((int)pixVal, (int)pixVal, (int)pixVal));
}
}
//img.Save("area.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
TimeSpan duration = DateTime.Now - start;
System.Console.WriteLine("Stroke area computed in " + duration.TotalMilliseconds + "ms");
return(cImg);
}
public static ColorImage Rotate(ColorImage input, double thetaInRadians)
{
double q = thetaInRadians;
int max = System.Math.Max(input.Width, input.Height);
ColorImage output = new ColorImage(max + max, max + max);
double cosX = System.Math.Cos(q);
double sinX = System.Math.Sin(q);
int origXCenter = input.Width / 2;
int origYCenter = input.Height / 2;
int xOffset = (int)(output.Width / 2);
int yOffset = (int)(output.Height / 2);
int xCenter = (int)((origXCenter * cosX) - (origYCenter * sinX));
int yCenter = (int)((origXCenter * sinX) + (origYCenter * cosX));
int xc = 0, yc = 0;
for (int y = 0; y < input.Height; y++)
{
for (int x = 0; x < input.Width; x++)
{
xc = x - origXCenter;
yc = y - origYCenter;
int xPrime = (int)((xc * cosX) - (yc * sinX)) + xOffset;
int yPrime = (int)((xc * sinX) + (yc * cosX)) + yOffset;
if ((xPrime > 0) && (xPrime < output.singledata.Length) && (yPrime > 0) && (yPrime < output.singledata.Length))
{
output.SetColor(xPrime, yPrime, input.GetColor(x, y));
}
}
}
return(output);
}
public static ColorImage ScaleHeight(ColorImage input, int oh)
{
ColorImage output = new ColorImage(input.Width, oh);
int x, y, v;
int res_r, acc_r;
int res_g, acc_g;
int res_b, acc_b;
int p, q;
int ih = input.Height;
int area = (ih * oh);
for (x = 0; x < input.Width; x++)
{
q = ih;
p = oh;
acc_r = 0;
acc_g = 0;
acc_b = 0;
y = v = 0;
while (y < oh)
{
if (v + 1 < ih)
{
/*
* res_r = p * input.data[v][x].R + (oh - p) * input.data[v][x].R;
* res_g = p * input.data[v][x].G + (oh - p) * input.data[v][x].G;
* res_b = p * input.data[v][x].B + (oh - p) * input.data[v][x].B;
*/
Color cxv = input.GetColor(x, v);
res_r = p * cxv.R + (oh - p) * cxv.R;
res_g = p * cxv.G + (oh - p) * cxv.G;
res_b = p * cxv.B + (oh - p) * cxv.B;
}
else
{
/*
* res_r = oh * input.data[v][x].R;
* res_g = oh * input.data[v][x].G;
* res_b = oh * input.data[v][x].B;
*/
Color cxv = input.GetColor(x, v);
res_r = oh * cxv.R;
res_g = oh * cxv.G;
res_b = oh * cxv.B;
}
if (p < q)
{
acc_r += res_r * p;
acc_g += res_g * p;
acc_b += res_b * p;
q -= p;
p = oh;
v++;
}
else
{
acc_r += res_r * q;
acc_g += res_g * q;
acc_b += res_b * q;
//output.data[y][x]= Color.FromArgb((byte)(acc_r / area), (byte)(acc_g / area), (byte)(acc_b / area));
output.SetColor(x, y, Color.FromArgb((byte)(acc_r / area), (byte)(acc_g / area), (byte)(acc_b / area)));
acc_r = 0;
acc_g = 0;
acc_b = 0;
p -= q;
q = ih;
y++;
}
}
}
output.Width = input.Width;
output.Height = oh;
return(output);
}
public static ColorImage ScaleWidth(ColorImage input, int ow)
{
ColorImage output = new ColorImage(ow, input.Height);
int u, x, y;
int res_r, res_g, res_b, acc_r, acc_g, acc_b;
int p, q;
int iw = input.Width;
int area = (ow * iw);
for (y = 0; y < input.Height; y++)
{
q = iw;
p = ow;
acc_r = 0;
acc_g = 0;
acc_b = 0;
x = u = 0;
while (x < ow)
{
if (u + 1 < iw)
{
/*
* res_r = p * input.data[y][u].R + (ow - p) * input.data[y][u+1].R;
* res_g = p * input.data[y][u].G + (ow - p) * input.data[y][u+1].G;
* res_b = p * input.data[y][u].B + (ow - p) * input.data[y][u+1].B;
*/
Color cuy = input.GetColor(u, y);
Color cuPlusOney = input.GetColor(u + 1, y);
res_r = p * cuy.R + (ow - p) * cuPlusOney.R;
res_g = p * cuy.G + (ow - p) * cuPlusOney.G;
res_b = p * cuy.B + (ow - p) * cuPlusOney.B;
}
else
{
/*
* res_r = ow * input.data[y][u].R;
* res_g = ow * input.data[y][u].G;
* res_b = ow * input.data[y][u].B;
*/
Color cuy = input.GetColor(u, y);
res_r = ow * cuy.R;
res_g = ow * cuy.G;
res_b = ow * cuy.B;
}
if (p < q)
{
acc_r += res_r * p;
acc_g += res_g * p;
acc_b += res_b * p;
q -= p;
p = ow;
u++;
}
else
{
acc_r += res_r * q;
acc_g += res_g * q;
acc_b += res_b * q;
//output.data[y][x] = Color.FromArgb((byte)(acc_r / area), (byte)(acc_g / area), (byte)(acc_b / area));
output.SetColor(x, y, Color.FromArgb((byte)(acc_r / area), (byte)(acc_g / area), (byte)(acc_b / area)));
acc_r = 0;
acc_g = 0;
acc_b = 0;
p -= q;
q = iw;
x++;
}
}
}
output.Width = ow;
output.Height = input.Height;
return(output);
}
public static int Blend(ref ColorImage inp, ColorImage stroke, Color rgb, int xc, int yc)
{
int xi, yi; /* lower left corner in input image */
int xa, ya; /* corresponding corner in alpha image */
int wa, ha; /* area in alpha image to be blended */
wa = stroke.Width;
xa = 0;
xi = xc - wa / 2;
if (xi < 0)
{
wa += xi;
xa -= xi;
xi = 0;
}
if (xi > inp.Width)
{
return(0);
}
if (wa <= 0)
{
return(0);
}
if (xi + wa >= inp.Width)
{
wa = inp.Width - xi;
}
ha = stroke.Height;
ya = 0;
yi = yc - ha / 2;
if (yi < 0)
{
ha += yi;
ya -= yi;
yi = 0;
}
if (yi > inp.Height)
{
return(0);
}
if (ha <= 0)
{
return(0);
}
if (yi + ha >= inp.Height)
{
ha = inp.Height - yi;
}
//la = stroke->row*stroke->type;
//li = in->row*in->type;
//input = in->buffer + li*yi + xi*in->type;
//alpha = stroke->buffer + la*ya + xa*stroke->type;
for (int iny = yi, strokey = ya; strokey < ha; iny++, strokey++)
{
for (int inx = xi, strokex = xa; strokex < wa; inx++, strokex++)
{
int upperR = stroke.GetColor(strokex, strokey).R;
double alpha = upperR / 255.0;
double oneMinusAlpha = (1.0 - alpha);
Color lowerC = inp.GetColor(inx, iny);
int r = (int)((alpha * rgb.R) + (lowerC.R * oneMinusAlpha));
int g = (int)((alpha * rgb.G) + (lowerC.G * oneMinusAlpha));
int b = (int)((alpha * rgb.B) + (lowerC.B * oneMinusAlpha));
inp.SetColor(inx, iny, Color.FromArgb(r, g, b));
}
}
return(1);
}
