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mcraihamcraiha
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‎AtkinsonDithering.cs

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/*
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This file implements error pushing of dithering via Atkinson kernel.
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This is free and unencumbered software released into the public domain.
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*/
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class AtkinsonDithering : DitheringBase
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{
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public AtkinsonDithering(FindColor colorfunc) : base(colorfunc)
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{
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this.methodLongName = "Atkinson";
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this.fileNameAddition = "_ATK";
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}
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override protected void PushError(int x, int y, short[] quantError)
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{
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// Push error
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// X 1/8 1/8
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// 1/8 1/8 1/8
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// 1/8
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int xMinusOne = x - 1;
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int xPlusOne = x + 1;
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int xPlusTwo = x + 2;
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int yPlusOne = y + 1;
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int yPlusTwo = y + 2;
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float multiplier = 1.0f / 8.0f; // Atkinson Dithering has same multiplier for every item
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// Current row
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int currentRow = y;
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if (this.IsValidCoordinate(xPlusOne, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusOne, currentRow, quantError, multiplier);
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}
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if (this.IsValidCoordinate(xPlusTwo, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusTwo, currentRow, quantError, multiplier);
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}
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// Next row
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currentRow = yPlusOne;
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if (this.IsValidCoordinate(xMinusOne, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xMinusOne, currentRow, quantError, multiplier);
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}
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if (this.IsValidCoordinate(x, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(x, currentRow, quantError, multiplier);
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}
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if (this.IsValidCoordinate(xPlusOne, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusOne, currentRow, quantError, multiplier);
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}
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// Next row
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currentRow = yPlusTwo;
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if (this.IsValidCoordinate(x, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(x, currentRow, quantError, multiplier);
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}
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}
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}
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‎BurkesDithering.cs

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/*
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This file implements error pushing of dithering via (Daniel) Burkes kernel.
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This is free and unencumbered software released into the public domain.
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*/
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class BurkesDithering : DitheringBase
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{
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public BurkesDithering(FindColor colorfunc) : base(colorfunc)
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{
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this.methodLongName = "Burkes";
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this.fileNameAddition = "_BUR";
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}
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override protected void PushError(int x, int y, short[] quantError)
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{
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// Push error
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// X 8/32 4/32
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// 2/32 4/32 8/32 4/32 2/32
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int xMinusOne = x - 1;
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int xMinusTwo = x - 2;
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int xPlusOne = x + 1;
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int xPlusTwo = x + 2;
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int yPlusOne = y + 1;
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// Current row
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int currentRow = y;
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if (this.IsValidCoordinate(xPlusOne, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusOne, currentRow, quantError, 8.0f / 32.0f);
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}
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if (this.IsValidCoordinate(xPlusTwo, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusTwo, currentRow, quantError, 4.0f / 32.0f);
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}
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// Next row
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currentRow = yPlusOne;
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if (this.IsValidCoordinate(xMinusTwo, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xMinusTwo, currentRow, quantError, 2.0f / 32.0f);
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}
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if (this.IsValidCoordinate(xMinusOne, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xMinusOne, currentRow, quantError, 4.0f / 32.0f);
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}
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if (this.IsValidCoordinate(x, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(x, currentRow, quantError, 8.0f / 32.0f);
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}
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if (this.IsValidCoordinate(xPlusOne, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusOne, currentRow, quantError, 4.0f / 32.0f);
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}
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if (this.IsValidCoordinate(xPlusTwo, currentRow))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusTwo, currentRow, quantError, 2.0f / 32.0f);
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}
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}
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}
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‎DitheringBase.cs

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using UnityEngine;
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using System.Collections;
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// This Delegate is used to find best suitable color from limited set of colors
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public delegate Color32 FindColor(Color32 original);
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public abstract class DitheringBase {
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protected int width;
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protected int height;
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protected FindColor colorFunction = null;
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protected string methodLongName = "";
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protected string fileNameAddition = "";
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private Color32[] pixels = null;
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public DitheringBase(FindColor colorfunc)
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{
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this.colorFunction = colorfunc;
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}
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//
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public Texture2D DoDithering(Texture2D input)
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{
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this.width = input.width;
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this.height = input.height;
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// Copy all pixels of input Texture2D to new array, which we are going to edit
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this.pixels = input.GetPixels32();
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Color32 originalPixel = Color.white; // Default value isn't used
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Color32 newPixel = Color.white; // Default value isn't used
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short[] quantError = null; // Default values aren't used
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for (int y = 0; y < this.height; y++)
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{
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for (int x = 0; x < this.width; x++)
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{
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originalPixel = this.pixels[GetIndexWith(x, y)];
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newPixel = this.colorFunction(originalPixel);
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this.pixels[GetIndexWith(x, y)] = newPixel;
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quantError = GetQuantError(originalPixel, newPixel);
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this.PushError(x, y, quantError);
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}
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}
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// Create the texture we are going to return from pixels array
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Texture2D returnTexture = new Texture2D(width, height, TextureFormat.ARGB32, false);
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returnTexture.SetPixels32(this.pixels);
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returnTexture.Apply();
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return returnTexture;
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}
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// Implement this for every dithering method
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protected abstract void PushError(int x, int y, short[] quantError);
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protected bool IsValidCoordinate(int x, int y)
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{
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return (0 <= x && x < this.width && 0 <= y && y < this.height);
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}
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protected int GetIndexWith(int x, int y)
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{
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return y * this.width + x;
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}
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public string GetMethodName()
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{
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return this.methodLongName;
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}
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public string GetFilenameAddition()
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{
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return this.fileNameAddition;
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}
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protected short[] GetQuantError(Color32 originalPixel, Color32 newPixel)
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{
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short[] returnValue = new short[4];
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returnValue [0] = (short)(originalPixel.r - newPixel.r);
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returnValue [1] = (short)(originalPixel.g - newPixel.g);
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returnValue [2] = (short)(originalPixel.b - newPixel.b);
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returnValue [3] = (short)(originalPixel.a - newPixel.a);
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return returnValue;
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}
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public void ModifyImageWithErrorAndMultiplier(int x, int y, short[] quantError, float multiplier)
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{
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Color32 oldColor = this.pixels[GetIndexWith(x, y)];
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// We limit the color here because we don't want the value go over 255 or under 0
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Color32 newColor = new Color32(
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GetLimitedValue(oldColor.r, Mathf.RoundToInt(quantError[0] * multiplier)),
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GetLimitedValue(oldColor.g, Mathf.RoundToInt(quantError[1] * multiplier)),
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GetLimitedValue(oldColor.b, Mathf.RoundToInt(quantError[2] * multiplier)),
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GetLimitedValue(oldColor.a, Mathf.RoundToInt(quantError[3] * multiplier)));
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this.pixels[GetIndexWith(x, y)] = newColor;
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}
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private static byte GetLimitedValue(byte original, int error)
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{
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int newValue = original + error;
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return (byte)Mathf.Clamp(newValue, byte.MinValue, byte.MaxValue);
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}
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}

‎FakeDithering.cs

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/*
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This file implements fake dithering, meaning NO dithering is done.
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This is free and unencumbered software released into the public domain.
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*/
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class FakeDithering : DitheringBase
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{
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public FakeDithering(FindColor colorfunc) : base(colorfunc)
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{
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this.methodLongName = "No dithering";
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this.fileNameAddition = "_NONE";
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}
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override protected void PushError(int x, int y, short[] quantError)
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{
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// Don't do anything
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}
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}
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‎FloydSteinbergDithering.cs

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/*
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This file implements error pushing of dithering via (Robert) Floyd and (Louis) Steinberg kernel.
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This is free and unencumbered software released into the public domain.
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*/
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public class FloydSteinbergDithering : DitheringBase
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{
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public FloydSteinbergDithering(FindColor colorfunc) : base(colorfunc)
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{
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this.methodLongName = "Floyd-Steinberg";
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this.fileNameAddition = "_FS";
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}
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override protected void PushError(int x, int y, short[] quantError)
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{
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// Push error
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// X 7/16
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// 3/16 5/16 1/16
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int xMinusOne = x - 1;
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int xPlusOne = x + 1;
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int yPlusOne = y + 1;
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// Current row
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if (this.IsValidCoordinate(xPlusOne, y))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusOne, y, quantError, 7.0f / 16.0f);
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}
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// Next row
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if (this.IsValidCoordinate(xMinusOne, yPlusOne))
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{
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this.ModifyImageWithErrorAndMultiplier(xMinusOne, yPlusOne, quantError, 3.0f / 16.0f);
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}
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if (this.IsValidCoordinate(x, yPlusOne))
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{
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this.ModifyImageWithErrorAndMultiplier(x, yPlusOne, quantError, 5.0f / 16.0f);
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}
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if (this.IsValidCoordinate(xPlusOne, yPlusOne))
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{
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this.ModifyImageWithErrorAndMultiplier(xPlusOne, yPlusOne, quantError, 1.0f / 16.0f);
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}
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}
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}

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