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RedKnackRedKnack
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First Blood
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‎NuGet.Config‎

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<?xml version="1.0" encoding="utf-8"?>
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<configuration>
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<packageSources>
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<!-- Standard NuGet -->
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<add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
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</packageSources>
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</configuration>

‎RedKnack.HalftonePlugin.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.0.31903.59
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RedKnack.HalftonePlugin", "RedKnack.HalftonePlugin\RedKnack.HalftonePlugin.csproj", "{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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EndGlobal

‎RedKnack.HalftonePlugin/ColorUtils.cs‎

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using PaintDotNet;
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using PaintDotNet.Effects;
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using System;
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using System.Runtime.CompilerServices;
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namespace RedKnack.HalftonePlugin
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{
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internal static class ColorUtils
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static float Luminance(ColorBgra c)
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=> c.R / 255f * 0.2126f
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+ c.G / 255f * 0.7152f
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+ c.B / 255f * 0.0722f;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static float Brightness(ColorBgra c)
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=> (c.R + c.G + c.B) / (3f * 255f);
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public static void RgbToCmyk(ColorBgra c,
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out float cyan, out float magenta, out float yellow, out float black)
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{
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float r = c.R / 255f;
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float g = c.G / 255f;
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float b = c.B / 255f;
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float k = 1f - MathF.Max(r, MathF.Max(g, b));
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if (k >= 1f)
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{
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cyan = magenta = yellow = 0f;
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black = 1f;
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return;
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}
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float inv = 1f / (1f - k);
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cyan = (1f - r - k) * inv;
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magenta = (1f - g - k) * inv;
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yellow = (1f - b - k) * inv;
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black = k;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static ColorBgra CmykToRgb(float c, float m, float y, float k)
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{
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float r = (1f - c) * (1f - k);
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float g = (1f - m) * (1f - k);
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float b = (1f - y) * (1f - k);
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return ColorBgra.FromBgraClamped(
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(int)(b * 255f),
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(int)(g * 255f),
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(int)(r * 255f),
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255);
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}
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public static ColorBgra SampleBilinear(Surface src, double x, double y)
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{
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int w = src.Width;
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int h = src.Height;
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int x0 = Math.Clamp((int)Math.Floor(x), 0, w - 1);
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int y0 = Math.Clamp((int)Math.Floor(y), 0, h - 1);
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int x1 = Math.Clamp(x0 + 1, 0, w - 1);
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int y1 = Math.Clamp(y0 + 1, 0, h - 1);
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float tx = (float)(x - Math.Floor(x));
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float ty = (float)(y - Math.Floor(y));
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ColorBgra c00 = src[x0, y0];
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ColorBgra c10 = src[x1, y0];
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ColorBgra c01 = src[x0, y1];
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ColorBgra c11 = src[x1, y1];
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return ColorBgra.FromBgraClamped(
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(int)(Lerp(Lerp(c00.B, c10.B, tx), Lerp(c01.B, c11.B, tx), ty)),
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(int)(Lerp(Lerp(c00.G, c10.G, tx), Lerp(c01.G, c11.G, tx), ty)),
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(int)(Lerp(Lerp(c00.R, c10.R, tx), Lerp(c01.R, c11.R, tx), ty)),
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(int)(Lerp(Lerp(c00.A, c10.A, tx), Lerp(c01.A, c11.A, tx), ty)));
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}
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public static ColorBgra SampleBox(Surface src, double cx, double cy, int size)
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{
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int half = size / 2;
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int w = src.Width;
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int h = src.Height;
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float r = 0, g = 0, b = 0, a = 0;
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int count = 0;
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int x0 = Math.Max(0, (int)(cx - half));
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int x1 = Math.Min(w - 1, (int)(cx + half));
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int y0 = Math.Max(0, (int)(cy - half));
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int y1 = Math.Min(h - 1, (int)(cy + half));
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for (int y = y0; y <= y1; y++)
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for (int x = x0; x <= x1; x++)
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{
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var px = src[x, y];
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if (px.A == 0) continue;
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r += px.R; g += px.G; b += px.B; a += px.A;
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count++;
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}
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if (count == 0) return ColorBgra.Transparent;
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float inv = 1f / count;
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int totalPixels = (x1 - x0 + 1) * (y1 - y0 + 1);
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float aAll = 0;
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for (int y = y0; y <= y1; y++)
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for (int x = x0; x <= x1; x++)
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aAll += src[x, y].A;
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float avgAlpha = aAll / totalPixels;
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return ColorBgra.FromBgraClamped(
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(int)(b * inv), (int)(g * inv), (int)(r * inv), (int)avgAlpha);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static float Lerp(float a, float b, float t) => a + (b - a) * t;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static double Lerp(double a, double b, double t) => a + (b - a) * t;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static double SmoothStep(double edge0, double edge1, double x)
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{
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double t = Math.Clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
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return t * t * (3.0 - 2.0 * t);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static byte ToByte(float v)
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=> (byte)Math.Clamp((int)(v * 255f + 0.5f), 0, 255);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static ColorBgra BlendColors(ColorBgra bg, ColorBgra fg, float t)
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{
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return ColorBgra.FromBgraClamped(
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(int)(bg.B + (fg.B - bg.B) * t),
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(int)(bg.G + (fg.G - bg.G) * t),
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(int)(bg.R + (fg.R - bg.R) * t),
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(int)(bg.A + (fg.A - bg.A) * t));
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}
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}
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}

‎RedKnack.HalftonePlugin/Enums.cs‎

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namespace RedKnack.HalftonePlugin
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{
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public enum DotShape
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{
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Circle,
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Diamond,
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Square,
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Line,
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Cross,
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Ellipse,
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Euclidean,
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Ring,
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}
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public enum ColorMode
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{
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Grayscale,
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CMYK,
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SpotColor,
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RGB,
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}
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public enum DotSizeCurve
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{
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AreaProportional,
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Linear,
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Gamma,
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Sine,
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}
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}

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