forked from Ninjalama/streamyfin_mirror
68 lines
2.1 KiB
TypeScript
68 lines
2.1 KiB
TypeScript
import { atom, useAtom } from "jotai";
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interface ThemeColors {
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primary: string;
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text: string;
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}
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export const calculateTextColor = (backgroundColor: string): string => {
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// Convert hex to RGB
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const r = Number.parseInt(backgroundColor.slice(1, 3), 16);
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const g = Number.parseInt(backgroundColor.slice(3, 5), 16);
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const b = Number.parseInt(backgroundColor.slice(5, 7), 16);
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// Calculate perceived brightness
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// Using the formula: (R * 299 + G * 587 + B * 114) / 1000
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const brightness = (r * 299 + g * 587 + b * 114) / 1000;
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// Calculate contrast ratio with white and black
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const contrastWithWhite = calculateContrastRatio([255, 255, 255], [r, g, b]);
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const contrastWithBlack = calculateContrastRatio([0, 0, 0], [r, g, b]);
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// Use black text if the background is bright and has good contrast with black
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if (brightness > 180 && contrastWithBlack >= 4.5) {
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return "#000000";
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}
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// Otherwise, use white text
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return "#FFFFFF";
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};
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// Helper function to calculate contrast ratio
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const calculateContrastRatio = (rgb1: number[], rgb2: number[]): number => {
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const l1 = calculateRelativeLuminance(rgb1);
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const l2 = calculateRelativeLuminance(rgb2);
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const lighter = Math.max(l1, l2);
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const darker = Math.min(l1, l2);
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return (lighter + 0.05) / (darker + 0.05);
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};
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// Helper function to calculate relative luminance
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const calculateRelativeLuminance = (rgb: number[]): number => {
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const [r, g, b] = rgb.map((c) => {
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c /= 255;
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return c <= 0.03928 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4;
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});
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return 0.2126 * r + 0.7152 * g + 0.0722 * b;
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};
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export const isCloseToBlack = (color: string): boolean => {
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const r = Number.parseInt(color.slice(1, 3), 16);
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const g = Number.parseInt(color.slice(3, 5), 16);
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const b = Number.parseInt(color.slice(5, 7), 16);
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// Check if the color is very dark (close to black)
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return r < 20 && g < 20 && b < 20;
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};
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export const adjustToNearBlack = (color: string): string => {
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return "#313131"; // A very dark gray, almost black
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};
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export const itemThemeColorAtom = atom<ThemeColors>({
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primary: "#FFFFFF",
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text: "#000000",
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});
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export const useItemThemeColor = () => useAtom(itemThemeColorAtom);
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