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hslToRGB,
labToRGB,
lchToRGB,
rgbToHSL,
rgbToLAB,
rgbToLCH,
} from "./color-converters";
import { ColorHSL } from "./color-hsl";
import { ColorLAB } from "./color-lab";
import { ColorLCH } from "./color-lch";
import { ColorRGBA64 } from "./color-rgba-64";
import { clamp } from "./math-utilities";
// The alpha channel of the input is ignored
export function saturateViaLCH(
input: ColorRGBA64,
saturation: number,
saturationConstant: number = 18
): ColorRGBA64 {
const lch: ColorLCH = rgbToLCH(input);
let sat: number = lch.c + saturation * saturationConstant;
if (sat < 0) {
sat = 0;
}
return lchToRGB(new ColorLCH(lch.l, sat, lch.h));
}
// The alpha channel of the input is ignored
export function desaturateViaLCH(
input: ColorRGBA64,
saturation: number,
saturationConstant: number = 18
): ColorRGBA64 {
return saturateViaLCH(input, -1 * saturation, saturationConstant);
}
// The alpha channel of the input is ignored
export function darkenViaLAB(
input: ColorRGBA64,
amount: number,
darkenConstant: number = 18
): ColorRGBA64 {
const lab: ColorLAB = rgbToLAB(input);
const darkened: number = lab.l - amount * darkenConstant;
return labToRGB(new ColorLAB(darkened, lab.a, lab.b));
}
// The alpha channel of the input is ignored
export function lightenViaLAB(
input: ColorRGBA64,
amount: number,
darkenConstant: number = 18
): ColorRGBA64 {
return darkenViaLAB(input, -1 * amount, darkenConstant);
}
export function blendBurnChannel(bottom: number, top: number): number {
if (top === 0.0) {
// Despite the discontinuity, other sources seem to use 0.0 here instead of 1
return 0.0;
}
return 1.0 - (1.0 - bottom) / top;
}
// The alpha channel of the input is ignored
export function blendBurn(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
return new ColorRGBA64(
blendBurnChannel(bottom.r, top.r),
blendBurnChannel(bottom.g, top.g),
blendBurnChannel(bottom.b, top.b),
1
);
}
// The alpha channel of the input is ignored
export function blendColor(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
const bottomHSL: ColorHSL = rgbToHSL(bottom);
const topHSL: ColorHSL = rgbToHSL(top);
if (topHSL.s === 0) {
return new ColorRGBA64(bottomHSL.l, bottomHSL.l, bottomHSL.l, 1);
}
return hslToRGB(new ColorHSL(topHSL.h, topHSL.s, bottomHSL.l));
}
export function blendDarkenChannel(bottom: number, top: number): number {
return Math.min(bottom, top);
}
// The alpha channel of the input is ignored
export function blendDarken(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
return new ColorRGBA64(
blendDarkenChannel(bottom.r, top.r),
blendDarkenChannel(bottom.g, top.g),
blendDarkenChannel(bottom.b, top.b),
1
);
}
export function blendDodgeChannel(bottom: number, top: number): number {
if (top >= 1.0) {
return 1.0;
}
const retVal: number = bottom / (1.0 - top);
if (retVal >= 1.0) {
return 1.0;
}
return retVal;
}
// The alpha channel of the input is ignored
export function blendDodge(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
return new ColorRGBA64(
blendDodgeChannel(bottom.r, top.r),
blendDodgeChannel(bottom.g, top.g),
blendDodgeChannel(bottom.b, top.b),
1
);
}
export function blendLightenChannel(bottom: number, top: number): number {
return Math.max(bottom, top);
}
// The alpha channel of the input is ignored
export function blendLighten(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
return new ColorRGBA64(
blendLightenChannel(bottom.r, top.r),
blendLightenChannel(bottom.g, top.g),
blendLightenChannel(bottom.b, top.b),
1
);
}
export function blendMultiplyChannel(bottom: number, top: number): number {
return bottom * top;
}
// The alpha channel of the input is ignored
export function blendMultiply(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
return new ColorRGBA64(
blendMultiplyChannel(bottom.r, top.r),
blendMultiplyChannel(bottom.g, top.g),
blendMultiplyChannel(bottom.b, top.b),
1
);
}
export function blendOverlayChannel(bottom: number, top: number): number {
if (bottom < 0.5) {
return clamp(2.0 * top * bottom, 0, 1);
}
return clamp(1.0 - 2.0 * (1.0 - top) * (1.0 - bottom), 0, 1);
}
// The alpha channel of the input is ignored
export function blendOverlay(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
return new ColorRGBA64(
blendOverlayChannel(bottom.r, top.r),
blendOverlayChannel(bottom.g, top.g),
blendOverlayChannel(bottom.b, top.b),
1
);
}
export function blendScreenChannel(bottom: number, top: number): number {
return 1.0 - (1.0 - top) * (1.0 - bottom);
}
// The alpha channel of the input is ignored
export function blendScreen(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
return new ColorRGBA64(
blendScreenChannel(bottom.r, top.r),
blendScreenChannel(bottom.g, top.g),
blendScreenChannel(bottom.b, top.b),
1
);
}
export enum ColorBlendMode {
Burn,
Color,
Darken,
Dodge,
Lighten,
Multiply,
Overlay,
Screen,
}
// The alpha channel of the input is ignored
export function blend(
mode: ColorBlendMode,
bottom: ColorRGBA64,
top: ColorRGBA64
): ColorRGBA64 {
switch (mode) {
case ColorBlendMode.Burn:
return blendBurn(bottom, top);
case ColorBlendMode.Color:
return blendColor(bottom, top);
case ColorBlendMode.Darken:
return blendDarken(bottom, top);
case ColorBlendMode.Dodge:
return blendDodge(bottom, top);
case ColorBlendMode.Lighten:
return blendLighten(bottom, top);
case ColorBlendMode.Multiply:
return blendMultiply(bottom, top);
case ColorBlendMode.Overlay:
return blendOverlay(bottom, top);
case ColorBlendMode.Screen:
return blendScreen(bottom, top);
default:
throw new Error("Unknown blend mode");
}
}
// Alpha channel of bottom is ignored
// The returned color always has an alpha channel of 1
// Different programs (eg: paint.net, photoshop) will give different answers than this occasionally but within +/- 1/255 in each channel. Just depends on the details of how they round off decimals
export function computeAlphaBlend(bottom: ColorRGBA64, top: ColorRGBA64): ColorRGBA64 {
Iif (top.a >= 1) {
return top;
} else Iif (top.a <= 0) {
return new ColorRGBA64(bottom.r, bottom.g, bottom.b, 1);
}
const r: number = top.a * top.r + (1 - top.a) * bottom.r;
const g: number = top.a * top.g + (1 - top.a) * bottom.g;
const b: number = top.a * top.b + (1 - top.a) * bottom.b;
return new ColorRGBA64(r, g, b, 1);
}
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