/// <summary>
/// Creates and saves a palette image from the unique colors in another image.
///
/// The palette image structure:
///
/// | | | | | | | | row of 16 16x16 squares with the third mix color
/// |__|__|__|__|__|__|__|__
/// | | | | | | | | row of 16 16x16 squares with the second mix color
/// |__|__|__|__|__|__|__|__
/// | | | | | | | | row of 16 16x16 squares with the first mix color
/// |__|__|__|__|__|__|__|__
///
/// Each horizontal square has a fixed Red component: 0/15 to 15/15.
/// The blue component increases from 0 to 1 horizontally over a square.
/// The green component increases from 0 to 1 vertically over a square.
///
/// The palette image is used in the shaders to convert a truecolor to several dithered colors.
/// The truecolor RGB components points to N colors in the palette, one color per row of squares.
/// The N colors are mixed together in a dithering pattern to produce a close approximation of the original truecolor.
///
/// The steps to create the palette image:
///
/// 1. Load the color image to a Texture2D
/// 2. Create a list of all the unique colors in the color image
/// 3. Create the palette image
/// 4. a) Loop through each pixel in the palette image and determine the truecolor for that pixel
/// b) Device a mixing plan to achieve the truecolor
/// c) Save the N colors in the square column
/// 5. Save the palette image
/// </summary>
private void CreatePalette()
{
if (script.MixedColorCount < 1) return;
// Load the color image to a Texture2D
Texture2D colorTexture = LoadTexture();
if (colorTexture == null) return;
// Create a list of all the unique colors in the color image
List<Color> paletteColors = new List<Color>();
bool proceed = false;
for (int x = 0; x < colorTexture.width; x++)
for (int y = 0; y < colorTexture.height; y++)
if (!paletteColors.Contains(colorTexture.GetPixel(x, y))) {
paletteColors.Add(colorTexture.GetPixel(x, y));
if (paletteColors.Count > MaxColors && !proceed) {
proceed = EditorUtility.DisplayDialog("Error", "Source image contains more than " + MaxColors + " colors. Continuing may lock up Unity for a long time", "Continue", "Stop");
if (!proceed)
return;
}
}
uint[] palette = new uint[paletteColors.Count];
for (int i = 0; i < paletteColors.Count; i++)
palette[i] = ColorToInt(paletteColors[i]);
MixingPlanner mixingPlanner = new MixingPlanner(palette);
// Create the palette image
int height = (int)Math.Pow(2, Math.Ceiling(Math.Log(ColorSquares * script.MixedColorCount - 1) / Math.Log(2)));
Texture2D paletteTexture = new Texture2D(ColorSquares * ColorSquares, height, TextureFormat.RGB24, false);
paletteTexture.name = colorTexture.name + "_pal_" + script.MixedColorCount;
// Loop through each pixel in the palette image and determine the target color for that pixel
for (int x = 0; x < ColorSquares * ColorSquares; x++)
for (int y = 0; y < ColorSquares; y++) {
byte r = (byte)((float)(x / ColorSquares) / (ColorSquares - 1) * 255);
byte g = (byte)((float)y / (ColorSquares - 1) * 255);
byte b = (byte)(((float)x % ColorSquares) / (ColorSquares - 1) * 255);
uint targetColor = (uint)((r << 16) + (g << 8) + b);
// Device a mixing plan to achieve the truecolor
uint[] mixingPlan = mixingPlanner.DeviseBestMixingPlan(targetColor, (uint)script.MixedColorCount);
// Save the N colors in the square column
for (int c = 0; c < script.MixedColorCount; c++)
paletteTexture.SetPixel(x, y + (script.MixedColorCount - c - 1) * ColorSquares, paletteColors[(int)mixingPlan[c]]);
}
// Save the palette image
SaveTexture(paletteTexture);
}
/* PALETTE GENERATION */
#region Palette generation
/// <summary>
/// Creates and saves a palette image from the unique colors in another image.
///
/// The palette image structure:
///
/// | | | | | | | | row of 16 16x16 squares with the third mix color
/// |__|__|__|__|__|__|__|__
/// | | | | | | | | row of 16 16x16 squares with the second mix color
/// |__|__|__|__|__|__|__|__
/// | | | | | | | | row of 16 16x16 squares with the first mix color
/// |__|__|__|__|__|__|__|__
///
/// Each horizontal square has a fixed Red component: 0/15 to 15/15.
/// The blue component increases from 0 to 1 horizontally over a square.
/// The green component increases from 0 to 1 vertically over a square.
///
/// The palette image is used in the shaders to convert a truecolor to several dithered colors.
/// The truecolor RGB components points to N colors in the palette, one color per row of squares.
/// The N colors are mixed together in a dithering pattern to produce a close approximation of the original truecolor.
///
/// The steps to create the palette image:
///
/// 1. Load the color image to a Texture2D
/// 2. Create a list of all the unique colors in the color image
/// 3. Create the palette image
/// 4. a) Loop through each pixel in the palette image and determine the truecolor for that pixel
/// b) Device a mixing plan to achieve the truecolor
/// c) Save the N colors in the square column
/// 5. Save the palette image
/// </summary>
private void GeneratePaletteTexture(Palette palette)
{
if (palette.Colors.Count == 0)
{
Debug.LogError(ContentText.emptyColorListError);
return;
}
uint[] paletteColors = ConvertColorListToPaletteList(palette.Colors);
MixingPlanner mixingPlanner = new MixingPlanner(paletteColors);
// Create the palette image
int height = (int)Math.Pow(2, Math.Ceiling(Math.Log(_colorSquares * CurrentPalette.MixedColorCount - 1) / Math.Log(2)));
if (palette.Texture == null)
{
palette.Texture = new Texture2D(_colorSquares * _colorSquares, height, TextureFormat.RGB24, false);
palette.Texture.name = "Palette Texture";
palette.Texture.filterMode = FilterMode.Point;
palette.Texture.wrapMode = TextureWrapMode.Repeat;
AssetDatabase.AddObjectToAsset(palette.Texture, palette);
AssetDatabase.ImportAsset(AssetDatabase.GetAssetPath(palette.Texture));
}
else if (palette.Texture.height != height)
{
palette.Texture.Resize(_colorSquares * _colorSquares, height);
}
// Fill empty rows with magenta
int x = 0, y = 0;
for (int i = 0; i < palette.Texture.height * palette.Texture.width; i++)
{
x = i / palette.Texture.height;
y = i % palette.Texture.width;
palette.Texture.SetPixel(x, y, Color.magenta);
}
// Loop through each pixel in the palette image and determine the target color for that pixel
for (x = 0; x < _colorSquares * _colorSquares; x++)
{
for (y = 0; y < _colorSquares; y++)
{
byte r = (byte)((float)(x / _colorSquares) / (_colorSquares - 1) * 255);
byte g = (byte)((float)y / (_colorSquares - 1) * 255);
byte b = (byte)(((float)x % _colorSquares) / (_colorSquares - 1) * 255);
uint targetColor = (uint)((r << 16) + (g << 8) + b);
// Device a mixing plan to achieve the truecolor
uint[] mixingPlan = mixingPlanner.DeviseBestMixingPlan(targetColor, (uint)CurrentPalette.MixedColorCount);
// Save the N colors in the square column
for (int c = 0; c < CurrentPalette.MixedColorCount; c++)
{
palette.Texture.SetPixel(x, y + (CurrentPalette.MixedColorCount - c - 1) * _colorSquares, palette.Colors[(int)mixingPlan[c]]);
}
}
}
palette.Texture.Apply();
palette.HasTexture = true;
// Save the palette image
// SaveTexture(texture);
}
/// <summary>
/// Creates and saves a palette image from the unique colors in another image.
///
/// The palette image structure:
///
/// | | | | | | | | row of 16 16x16 squares with the third mix color
/// |__|__|__|__|__|__|__|__
/// | | | | | | | | row of 16 16x16 squares with the second mix color
/// |__|__|__|__|__|__|__|__
/// | | | | | | | | row of 16 16x16 squares with the first mix color
/// |__|__|__|__|__|__|__|__
///
/// Each horizontal square has a fixed Red component: 0/15 to 15/15.
/// The blue component increases from 0 to 1 horizontally over a square.
/// The green component increases from 0 to 1 vertically over a square.
///
/// The palette image is used in the shaders to convert a truecolor to several dithered colors.
/// The truecolor RGB components points to N colors in the palette, one color per row of squares.
/// The N colors are mixed together in a dithering pattern to produce a close approximation of the original truecolor.
///
/// The steps to create the palette image:
///
/// 1. Load the color image to a Texture2D
/// 2. Create a list of all the unique colors in the color image
/// 3. Create the palette image
/// 4. a) Loop through each pixel in the palette image and determine the truecolor for that pixel
/// b) Device a mixing plan to achieve the truecolor
/// c) Save the N colors in the square column
/// 5. Save the palette image
/// </summary>
private void CreatePalette()
{
// Load the color image to a Texture2D
Texture2D colorTexture = LoadTexture();
if (colorTexture == null)
{
return;
}
// Create a list of all the unique colors in the color image
List <Color> paletteColors = new List <Color>();
for (int x = 0; x < colorTexture.width; x++)
{
for (int y = 0; y < colorTexture.height; y++)
{
if (!paletteColors.Contains(colorTexture.GetPixel(x, y)))
{
paletteColors.Add(colorTexture.GetPixel(x, y));
}
}
}
uint[] palette = new uint[paletteColors.Count];
for (int i = 0; i < paletteColors.Count; i++)
{
palette[i] = ColorToInt(paletteColors[i]);
}
MixingPlanner mixingPlanner = new MixingPlanner(palette);
// Create the palette image
int height = (int)Math.Pow(2, Math.Ceiling(Math.Log(ColorSquares * script.MixedColorCount - 1) / Math.Log(2)));
Texture2D paletteTexture = new Texture2D(ColorSquares * ColorSquares, height, TextureFormat.RGB24, false);
paletteTexture.name = colorTexture.name + "_pal_" + script.MixedColorCount;
// Loop through each pixel in the palette image and determine the target color for that pixel
for (int x = 0; x < ColorSquares * ColorSquares; x++)
{
for (int y = 0; y < ColorSquares; y++)
{
byte r = (byte)((float)(x / ColorSquares) / (ColorSquares - 1) * 255);
byte g = (byte)((float)y / (ColorSquares - 1) * 255);
byte b = (byte)(((float)x % ColorSquares) / (ColorSquares - 1) * 255);
uint targetColor = (uint)((r << 16) + (g << 8) + b);
// Device a mixing plan to achieve the truecolor
uint[] mixingPlan = mixingPlanner.DeviseBestMixingPlan(targetColor, (uint)script.MixedColorCount);
// Save the N colors in the square column
for (int c = 0; c < script.MixedColorCount; c++)
{
paletteTexture.SetPixel(x, y + (script.MixedColorCount - c - 1) * ColorSquares, paletteColors[(int)mixingPlan[c]]);
}
}
}
// Save the palette image
SaveTexture(paletteTexture);
}
