72 lines
2.2 KiB
C#
72 lines
2.2 KiB
C#
using System.Drawing;
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namespace MSDF_Test;
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public class Glyph
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{
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private Bitmap originalBitmap;
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private const float MaxColor = 255; //255 for Bitmaps
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private const float DistanceRange = 255; //255 for Bitmaps
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public Glyph(Bitmap texture)
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{
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this.originalBitmap = texture;
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}
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internal Bitmap GetBitmap(int size, Color foreground, Color background)
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{
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Bitmap ret = new(size, size, originalBitmap.PixelFormat);
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for (int x = 0; x < ret.Width; x++)
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{
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for (int y = 0; y < ret.Height; y++)
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{
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PointF scaledPoint = new (x, y);
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ret.SetPixel(x, y, GeneratePixel(scaledPoint.Scale((float)originalBitmap.Width / size)) ? foreground : background);
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}
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}
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return ret;
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}
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private bool GeneratePixel(PointF point)
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{
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Color s = SampleBilinear(point);
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float sample = Median(s);
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float d = ColorDistance(sample);
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return d >= 0;
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}
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private Color SampleBilinear(PointF point)
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{
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int x1 = (int)Math.Floor(point.X - .5);
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int y1 = (int)Math.Floor(point.Y - .5);
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int x2 = x1 + 1;
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int y2 = y1 + 1;
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double wx = point.X - x1 - .5;
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double wy = point.Y - y1 - .5;
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if (x1 >= 0 && y1 >= 0 && x2 <= (originalBitmap.Width - 1) && y2 <= (originalBitmap.Height - 1))
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{
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Color x1y1 = originalBitmap.GetPixel(x1, y1).MultiplyWith((1 - wx) * (1 - wy));
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Color x1y2 = originalBitmap.GetPixel(x1, y2).MultiplyWith((1 - wx) * wy);
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Color x2y1 = originalBitmap.GetPixel(x2, y1).MultiplyWith(wx * (1 - wy));
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Color x2y2 = originalBitmap.GetPixel(x2, y2).MultiplyWith(wx * wy);
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return x1y1.Add(x1y2).Add(x2y1).Add(x2y2);
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}
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return Color.Black; //Edges can not be interpolated. Just return 0
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}
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internal static float Median(float r, float g, float b)
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{
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return Math.Max(Math.Min(r, g), Math.Min(Math.Max(r, g), b));
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}
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internal static float Median(Color c) => Median(c.R, c.G, c.B);
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internal static float ColorDistance(float sample)
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{
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return ((sample / MaxColor) - .5f) * DistanceRange;
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}
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} |