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import { QuantizedColor } from "./color-quantization";
import { ColorHSL } from "./color-hsl";
import { rgbToHSL } from "./color-converters";
export interface PaletteEntryConstraint {
id: string;
targetSaturation: number;
minSaturation: number;
maxSaturation: number;
targetLuminosity: number;
minLuminosity: number;
maxLuminosity: number;
}
export interface PaletteEntry {
found: boolean;
constraint: PaletteEntryConstraint;
color?: QuantizedColor;
}
export interface PaletteExtractionConfig {
saturationWeight: number;
luminosityWeight: number;
populationWeight: number;
volumeWeight: number;
constraints: PaletteEntryConstraint[];
}
export const defaultPaletteExtractionConfig: PaletteExtractionConfig = {
saturationWeight: 6,
luminosityWeight: 3,
populationWeight: 1,
volumeWeight: 0.1,
constraints: [
{
id: "Vibrant",
targetSaturation: 1,
minSaturation: 0.35,
maxSaturation: 1,
targetLuminosity: 0.5,
minLuminosity: 0.3,
maxLuminosity: 0.7,
},
{
id: "LightVibrant",
targetSaturation: 1,
minSaturation: 0.35,
maxSaturation: 1,
targetLuminosity: 0.74,
minLuminosity: 0.55,
maxLuminosity: 1,
},
{
id: "DarkVibrant",
targetSaturation: 1,
minSaturation: 0.35,
maxSaturation: 1,
targetLuminosity: 0.26,
minLuminosity: 0,
maxLuminosity: 0.45,
},
{
id: "Muted",
targetSaturation: 0.3,
minSaturation: 0,
maxSaturation: 0.4,
targetLuminosity: 0.5,
minLuminosity: 0.3,
maxLuminosity: 0.7,
},
{
id: "LightMuted",
targetSaturation: 0.3,
minSaturation: 0,
maxSaturation: 0.4,
targetLuminosity: 0.74,
minLuminosity: 0.55,
maxLuminosity: 1,
},
{
id: "DarkMuted",
targetSaturation: 0.3,
minSaturation: 0,
maxSaturation: 0.4,
targetLuminosity: 0.26,
minLuminosity: 0,
maxLuminosity: 0.45,
},
],
};
export function extractPalette(
colors: QuantizedColor[],
config: PaletteExtractionConfig = defaultPaletteExtractionConfig
): PaletteEntry[] {
Iif (config.constraints.length === 0) {
return [];
}
let totalPixelCount: number = 0;
let totalVolume: number = 0;
for (let i: number = 0; i < colors.length; i++) {
totalPixelCount += colors[i].pixelCount;
totalVolume += colors[i].colorVolume;
}
const retVal: PaletteEntry[] = new Array(config.constraints.length);
const bestFitValues: number[] = new Array(config.constraints.length);
for (let i: number = 0; i < retVal.length; i++) {
bestFitValues[i] = 0;
retVal[i] = {
found: false,
constraint: config.constraints[i],
};
}
const totalWeight: number =
config.saturationWeight +
config.luminosityWeight +
config.populationWeight +
config.volumeWeight;
for (let i: number = 0; i < colors.length; i++) {
const hsl: ColorHSL = rgbToHSL(colors[i].color);
for (let j: number = 0; j < config.constraints.length; j++) {
// Check for min and max saturation / luminosity
if (
hsl.s >= config.constraints[j].minSaturation &&
hsl.s <= config.constraints[j].maxSaturation &&
hsl.l >= config.constraints[j].minLuminosity &&
hsl.l <= config.constraints[j].maxLuminosity
) {
const populationFactor: number = colors[i].pixelCount / totalPixelCount;
const volumeFactor: number = colors[i].colorVolume / totalVolume;
const saturationFactor: number =
1 - Math.abs(hsl.s - config.constraints[j].targetSaturation);
const luminosityFactor: number =
1 - Math.abs(hsl.l - config.constraints[j].targetLuminosity);
const fitValue: number =
(populationFactor * config.populationWeight +
volumeFactor * config.volumeWeight +
saturationFactor * config.saturationWeight +
luminosityFactor * config.luminosityWeight) /
totalWeight;
if (fitValue > bestFitValues[j]) {
// Check if this color is already in use
let dupe: boolean = false;
for (let k: number = 0; k < j; k++) {
if (
retVal[k].found &&
retVal[k].color!.color.equalValue(colors[i].color)
) {
dupe = true;
break;
}
}
if (!dupe) {
bestFitValues[j] = fitValue;
retVal[j].found = true;
retVal[j].color = colors[i];
}
}
}
}
}
return retVal;
}
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