public static void FromBitmap(out Grid g1, out Grid g2, int width, int height, uint[] buffer)
{
g1 = new Grid(width, height);
g2 = new Grid(width, height);
Point inside = Inside;
Point outside = Outside;
int idx = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
uint color = buffer[idx];
bool set = (color & 0xff) > 0x7f;
if (set)
{
g2.Put(x, y, inside);
g1.Put(x, y, outside);
}
else
{
g1.Put(x, y, inside);
g2.Put(x, y, outside);
}
idx++;
}
}
}
public static Bitmap ToBitmap(Grid g1, Grid g2, int scalefactor, InterpolationMode interpolation)
{
uint[] buffer;
Bitmap bmp = BitmapHelper.CreateNewManagedBitmap(g1.Width, g1.Height, out buffer);
float spread = Math.Min(g1.Width, g1.Height) / (1 << scalefactor);
float min = -spread;
float max = spread;
int width = bmp.Width;
int height = bmp.Height;
int idx = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
float dst = g1.grid[idx].Dist() - g2.grid[idx].Dist();
dst = dst < 0
? -128 * (dst - min) / min
: 128 + 128 * dst / max;
uint channel = (uint)Math.Max(0, Math.Min(255, dst));
uint val = (channel << 24) | (channel << 16) | (channel << 8) | channel;
buffer[idx] = val;
idx++;
}
}
return BitmapHelper.ResizeBitmap(bmp, g1.Width >> scalefactor, g1.Height >> scalefactor, interpolation);
}