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Palettizer
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various palette gen fixes

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cosmonaut 2021-11-30 15:21:47 -08:00
parent 1713c86afe
commit 3a5705eb17
2 changed files with 102 additions and 63 deletions
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105
src/Palette.cs
View File

@ -4,45 +4,58 @@ namespace Palettizer
{
public class Palette
{
public Dictionary<byte, Color> GrayscaleToColorMap { get; }
public Color[] GrayscaleToColor { get; }
public Dictionary<Color, byte> ColorToGrayscaleMap { get; }
public byte GrayscaleIndex { get; set; }
public int GrayscaleCount { get; set; }
public List<byte[]> AlternateColorRows { get; }
public int Width { get => ColorToGrayscaleMap.Count; }
public int Height { get => AlternateColorRows.Count + 1; }
public int Width { get => 256; }
public int Height { get => AlternateColorRows.Count + 2; }
public Palette()
{
GrayscaleToColorMap = new Dictionary<byte, Color>();
ColorToGrayscaleMap = new Dictionary<Color, byte>();
GrayscaleIndex = 0;
GrayscaleCount = 0;
AlternateColorRows = new List<byte[]>();
}
public void AddColor(Color color, byte grayscaleIndex)
public void AddColor(Color color)
{
ColorToGrayscaleMap.Add(color, grayscaleIndex);
var average = (color.R + color.G + color.B) / 3;
if (GrayscaleToColorMap.ContainsKey((byte)average))
{
var increment = 1;
for (var i = 0; i < 256 - GrayscaleCount; i += 1)
{
average += increment;
if (!GrayscaleToColorMap.ContainsKey((byte)average))
{
break;
}
increment = ((increment > 0) ? (increment + 1) : (increment - 1)) * -1;
}
}
GrayscaleToColorMap.Add((byte)average, color);
ColorToGrayscaleMap.Add(color, (byte)average);
GrayscaleCount += 1;
}
public void AddAlternateColorRow(Color[] colors)
{
var byteArray = new byte[ColorToGrayscaleMap.Count * 4];
var byteArray = new byte[256 * 4];
foreach (var color in colors)
for (var i = 0; i < 256; i += 1)
{
if (ColorToGrayscaleMap.ContainsKey(color))
{
var grayscaleIndex = ColorToGrayscaleMap[color];
byteArray[grayscaleIndex] = color.R;
byteArray[grayscaleIndex + 1] = color.G;
byteArray[grayscaleIndex + 2] = color.B;
byteArray[grayscaleIndex + 3] = color.A;
}
else
{
System.Console.WriteLine($"Color {color.ToString()} doesn't exist in the grayscale palette!! Bailing!!!");
return;
}
byteArray[i * 4] = colors[i].R;
byteArray[i * 4 + 1] = colors[i].G;
byteArray[i * 4 + 2] = colors[i].B;
byteArray[i * 4 + 3] = colors[i].A;
}
AlternateColorRows.Add(byteArray);
@ -50,34 +63,38 @@ namespace Palettizer
public byte[] CreateIndexedPaletteBitmap()
{
var paletteBitmap = new byte[ColorToGrayscaleMap.Count * 4 * (AlternateColorRows.Count + 1)];
var paletteBitmap = new byte[256 * (AlternateColorRows.Count + 2) * 4];
var index = 0;
foreach (KeyValuePair<Color, byte> kv in ColorToGrayscaleMap)
for (var i = 0; i < 256; i += 1)
{
var color = kv.Key;
var grayscale = kv.Value;
paletteBitmap[index] = grayscale;
paletteBitmap[index + 1] = grayscale;
paletteBitmap[index + 2] = grayscale;
paletteBitmap[index + 3] = 255;
var alternateIndex = 1;
foreach (var alternateColorRow in AlternateColorRows)
{
for (var j = 0; j < ColorToGrayscaleMap.Count * 4; j += 4)
{
paletteBitmap[index + (ColorToGrayscaleMap.Count * alternateIndex)] = alternateColorRow[j];
paletteBitmap[index + 1 + (ColorToGrayscaleMap.Count * alternateIndex)] = alternateColorRow[j + 1];
paletteBitmap[index + 2 + (ColorToGrayscaleMap.Count * alternateIndex)] = alternateColorRow[j + 2];
paletteBitmap[index + 3 + (ColorToGrayscaleMap.Count * alternateIndex)] = alternateColorRow[j + 3];
paletteBitmap[i * 4] = (byte)i;
paletteBitmap[i * 4 + 1] = (byte)i;
paletteBitmap[i * 4 + 2] = (byte)i;
paletteBitmap[i * 4 + 3] = 255;
}
alternateIndex += 1;
for (var i = 0; i < 256; i += 1)
{
var color = new Color();
if (GrayscaleToColorMap.ContainsKey((byte)i))
{
color = GrayscaleToColorMap[(byte)i];
}
paletteBitmap[(256 + i) * 4] = color.R;
paletteBitmap[(256 + i) * 4 + 1] = color.G;
paletteBitmap[(256 + i) * 4 + 2] = color.B;
paletteBitmap[(256 + i) * 4 + 3] = color.A;
}
index += 4;
for (var i = 0; i < 256; i += 1)
{
for (var j = 0; j < AlternateColorRows.Count; j += 1)
{
paletteBitmap[(i + (256 * (j + 2))) * 4] = AlternateColorRows[j][i * 4];
paletteBitmap[(i + (256 * (j + 2))) * 4 + 1] = AlternateColorRows[j][i * 4 + 1];
paletteBitmap[(i + (256 * (j + 2))) * 4 + 2] = AlternateColorRows[j][i * 4 + 2];
paletteBitmap[(i + (256 * (j + 2))) * 4 + 3] = AlternateColorRows[j][i * 4 + 3];
}
}
return paletteBitmap;

42
src/Program.cs
View File

@ -1,3 +1,4 @@
using System.Collections.Generic;
using System.CommandLine;
using System.CommandLine.Invocation;
using System.IO;
@ -114,18 +115,40 @@ namespace Palettizer
{
ImageResult paletteImage = ImageResult.FromStream(stream, ColorComponents.RedGreenBlueAlpha);
for (var j = 0; j < paletteImage.Width; j += 1)
var indexToGrayscaleMap = new Dictionary<int, byte>();
// build the color index
for (var i = 0; i < paletteImage.Height; i += 1)
{
var colorPalette = new Color[paletteImage.Height];
var sourceColor = new Color
{
R = paletteImage.Data[i * paletteImage.Width * 4],
G = paletteImage.Data[i * paletteImage.Width * 4 + 1],
B = paletteImage.Data[i * paletteImage.Width * 4 + 2],
A = paletteImage.Data[i * paletteImage.Width * 4 + 3]
};
if (palette.ColorToGrayscaleMap.ContainsKey(sourceColor))
{
indexToGrayscaleMap.Add(i, palette.ColorToGrayscaleMap[sourceColor]);
}
}
for (var j = 1; j < paletteImage.Width; j += 1)
{
var colorPalette = new Color[256];
for (var i = 0; i < paletteImage.Height; i += 1)
{
colorPalette[i] = new Color
if (!indexToGrayscaleMap.ContainsKey(i)) { continue; }
var grayscale = indexToGrayscaleMap[i];
colorPalette[grayscale] = new Color
{
R = paletteImage.Data[j * 4 + i * paletteImage.Width * 4],
G = paletteImage.Data[(j * 4 + i * paletteImage.Width * 4) + 1],
B = paletteImage.Data[(j * 4 + i * paletteImage.Width * 4) + 2],
A = paletteImage.Data[(j * 4 + i * paletteImage.Width * 4) + 3]
R = paletteImage.Data[(j + i * paletteImage.Width) * 4],
G = paletteImage.Data[(j + i * paletteImage.Width) * 4 + 1],
B = paletteImage.Data[(j + i * paletteImage.Width) * 4 + 2],
A = paletteImage.Data[(j + i * paletteImage.Width) * 4 + 3]
};
}
@ -171,15 +194,14 @@ namespace Palettizer
}
else
{
if (palette.GrayscaleIndex == 255)
if (palette.GrayscaleCount == 256)
{
console.Out.Write("Too many colors! Bailing!\n");
return grayscaleImage;
}
else
{
palette.ColorToGrayscaleMap.Add(color, palette.GrayscaleIndex);
palette.GrayscaleIndex += 1;
palette.AddColor(color);
}
}
}