/// <summary>
/// helper function for filling a float bitmap
/// with a gradient from positions and colors
/// colors and positions must be the same length
/// as they should be 1 to 1 reference
/// </summary>
/// <param name="dst"></param>
/// <param name="positions"></param>
/// <param name="colors"></param>
public static void CreateGradient(FloatBitmap dst, float[] positions, MVector[] colors)
{
if (positions.Length != colors.Length)
{
return;
}
//sort from least to greater
Array.Sort(positions);
List <float> pos = new List <float>(positions);
List <MVector> cols = new List <MVector>(colors);
if (positions[0] > 0)
{
pos.Insert(0, 0);
MVector c = colors[0];
cols.Insert(0, c);
}
if (positions[positions.Length - 1] < 1)
{
pos.Add(1);
MVector c = colors[colors.Length - 1];
cols.Add(c);
}
for (int i = 0; i < pos.Count - 1; i++)
{
float p1 = pos[i];
float p2 = pos[i + 1];
MVector c1 = cols[i];
MVector c2 = cols[i + 1];
ConvertToLAB(ref c1);
ConvertToLAB(ref c2);
int imin = (int)(p1 * dst.Width);
int imax = (int)(p2 * dst.Width);
for (int x = imin; x < imax; x++)
{
//minus 1 on imax otherwise we won't reach 1 for t
float t = (float)(x - imin) / (float)(imax - 1 - imin);
MVector n = MVector.Lerp(c1, c2, t);
ConvertLABToRGB(ref n);
for (int y = 0; y < dst.Height; y++)
{
dst.SetPixel(x, y, n.X, n.Y, n.Z, n.W);
}
}
}
}
static void Main(string[] args)
{
string fpath = "E:\\Test\\input.png";
string spath = "E:\\Test\\output.png";
using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(fpath))
{
FloatBitmap bitmap = FloatBitmap.FromBitmap(bmp);
float[] f = new float[Math.Max(bitmap.Width, bitmap.Height)];
for (int x = 0; x < bitmap.Width; ++x)
{
for (int y = 0; y < bitmap.Height; ++y)
{
float r, g, b, a;
bitmap.GetPixel(x, y, out r, out g, out b, out a);
f[y] = r;
}
float[] d = dt(f, bitmap.Height);
for (int y = 0; y < bitmap.Height; ++y)
{
float fx = d[y];
bitmap.SetPixel(x, y, fx, fx, fx, 1);
}
}
for (int y = 0; y < bitmap.Height; ++y)
{
for (int x = 0; x < bitmap.Width; ++x)
{
float r, g, b, a;
bitmap.GetPixel(x, y, out r, out g, out b, out a);
f[x] = r;
}
float[] d = dt(f, bitmap.Width);
for (int x = 0; x < bitmap.Width; ++x)
{
float fx = d[x];
bitmap.SetPixel(x, y, fx, fx, fx, 1);
}
}
}
}
public static void Fill(FloatBitmap dst, int xOffset, int yOffset, float r = 0, float g = 0, float b = 0, float a = 0)
{
Parallel.For(yOffset, dst.Height, y =>
{
for (int x = xOffset; x < dst.Width; x++)
{
dst.SetPixel(x, y, r, g, b, a);
}
});
}