public RawImage Resample(int factor)
{
switch (factor)
{
case 2:
case 3:
case 4:
break;
default:
throw new ArgumentException("Invalid resample factor");
}
int w = this.Width / factor;
int h = this.Height / factor;
int[] dest = new int[w * h];
int p = 0;
int[] pp = new int[4];
double l;
double a;
double b;
for (int i = 0; i < h; i++)
{
int x = (i * factor) * this.Width;
for (int k = 0; k < factor; k++)
{
pp[k] = x;
x += this.Width;
}
for (int j = 0; j < w; j++)
{
int count = 0;
l = a = b = 0f;
for (int k = 0; k < factor; k++)
{
for (int m = 0; m < factor; m++)
{
LabColor lab = ColorTransform.RgbToLab(Color.FromArgb(this.Pixels[pp[k]]));
l += lab.L;
a += lab.A;
b += lab.B;
pp[k]++;
++count;
}
}
dest[p++] = ColorTransform.LabToRgb(new LabColor(
l / (double)count,
a / (double)count,
b / (double)count)).ToArgb() & 0xffffff;
}
}
return(new RawImage(w, h, dest));
}
private static Color[] LabSort(Color[] colors, Color origin)
{
List <LabColor> l = new List <LabColor>(colors.Length);
for (int i = 0; i < colors.Length; i++)
{
l.Add(ColorTransform.RgbToLab(colors[i]));
}
l.Sort(new PaletteColorComparer(origin));
Color[] c = new Color[l.Count];
for (int i = 0; i < l.Count; i++)
{
c[i] = ColorTransform.LabToRgb(l[i]);
}
return(c);
}
public void UpdatePaletteClusters(ClusteringPoint[] clusters, ClusteringPoint[] points)
{
if (clusters == null)
{
return;
}
using (SqlConnection conn = this.GetConnection())
{
SqlCommand cmd = new SqlCommand(@"DELETE FROM PALETTE_COLOR WHERE PALETTE_ID < 0", conn);
cmd.ExecuteNonQuery();
cmd = null;
cmd = new SqlCommand(@"UPDATE PALETTE SET CLUSTER = NULL", conn);
cmd.ExecuteNonQuery();
cmd = null;
for (int i = 0; i < clusters.Length; i++)
{
ClusteringPoint p = clusters[i];
int j = 0;
int order = 0;
while (j < p.Size)
{
int rgb = ColorTransform.LabToRgb(new LabColor(p[j++], p[j++], p[j++])).ToArgb() & 0xffffff;
++order;
cmd = new SqlCommand(@"INSERT INTO [PALETTE_COLOR] ([PALETTE_ID],[ORDER],[RGB]) VALUES
(-" + (i + 1).ToString() + "," + order.ToString() + "," + rgb.ToString() + ")", conn);
cmd.ExecuteNonQuery();
cmd = null;
}
}
for (int i = 0; i < points.Length; i++)
{
int id = points[i].Id;
int cluster = -(points[i].Index + 1);
cmd = new SqlCommand(@"UPDATE PALETTE SET CLUSTER = " + cluster.ToString() + " WHERE ID = " + id.ToString(), conn);
cmd.ExecuteNonQuery();
cmd = null;
}
}
}
public Color FromColor3(Color3 color)
{
return(ColorTransform.LabToRgb(new LabColor(color.A, color.B, color.C)));
}
public RawImage ResizeTo(int maxDimension)
{
if ((this.Width <= maxDimension) && (this.Height <= maxDimension))
{
return(this);
}
double scaleX = (double)this.Width / (double)maxDimension;
double scaleY = (double)this.Height / (double)maxDimension;
scaleX = scaleX > scaleY ? scaleX : scaleY;
int w = (int)((double)this.Width / scaleX);
int h = (int)((double)this.Height / scaleX);
scaleX = (double)this.Width / (double)(w + 1);
int[] mapX = new int[w + 1];
for (int i = 0; i <= w; i++)
{
mapX[i] = (int)(scaleX * (double)i);
}
mapX[w] = this.Width;
scaleY = (double)this.Height / (double)(h + 1);
int[] mapY = new int[h + 1];
for (int i = 0; i <= h; i++)
{
mapY[i] = (int)(scaleY * (double)i);
}
mapY[h] = this.Height;
int p = 0;
double l;
double a;
double b;
int[] dest = new int[w * h];
for (int i = 0; i < h; i++)
{
int y0 = mapY[i];
int y1 = mapY[i + 1];
for (int j = 0; j < w; j++)
{
int x0 = mapX[j];
int x1 = mapX[j + 1];
int count = 0;
l = a = b = 0f;
for (int ii = y0; ii < y1; ii++)
{
for (int jj = x0; jj < x1; jj++)
{
int c = this.Pixels[(ii * this.Width) + jj];
LabColor lab = ColorTransform.RgbToLab(Color.FromArgb(c));
l += lab.L;
a += lab.A;
b += lab.B;
++count;
}
}
if (count > 0)
{
dest[p] = ColorTransform.LabToRgb(new LabColor(
l / (double)count,
a / (double)count,
b / (double)count)).ToArgb() & 0xffffff;
}
++p;
}
}
return(new RawImage(w, h, dest));
}
