import type { PlanetConfig } from '../../types/body.types';
/**
 * Parse a `#rrggbb` (or `rrggbb`) color string into its `[r, g, b]` byte
 * components in the [0, 255] range.
 */
export declare function hexToRgb(hex: string): [number, number, number];
/**
 * Format RGB byte components as a `#rrggbb` hex string. Each component is
 * clamped to [0, 255] and rounded to the nearest integer before encoding.
 */
export declare function rgbToHex(r: number, g: number, b: number): string;
/**
 * Apply warm/cool color shift + luminance to a palette hex color.
 * colorMix: 0=cooler, 0.5=neutral, 1=warmer.
 */
export declare function shiftColor(hex: string, colorMix: number, luminance: number): string;
/**
 * Resolves the rocky planet's shader colour anchors from the caller-supplied
 * `terrainColorLow` / `terrainColorHigh` config fields.
 *
 * The lib no longer carries any resource vocabulary, so anchor selection is
 * the caller's concern: callers compute defaults (e.g. from the body's mean
 * equilibrium temperature) and write them back onto the config before
 * calling `useBody`. The playground ships a reference implementation via
 * `deriveTemperatureAnchors`.
 *
 * When the caller omits the anchors, the palette falls back to neutral
 * charcoal / pewter defaults. Lava colour is not part of this resolver
 * anymore — it lives on `BodyVariation.lavaColor` (caller-pushable).
 */
export declare function rockyColors(config: PlanetConfig): {
    colorA: string;
    colorB: string;
};
/**
 * Crack color = same hue/saturation as the planet surface, but with a
 * target lightness far from the surface average so cracks are always visible.
 */
export declare function rockyCrackColor(colorA: string, colorB: string): string;
/**
 * Returns the four band-colour hex stops (A/B/C/D) consumed by the gas
 * shader's uniforms. The lib no longer blends molecule archetypes — callers
 * pass the already-blended stops through `config.bandColors`. A neutral
 * warm-tan default is substituted when the field is omitted.
 */
export declare function gasColorPalette(config: PlanetConfig): Record<string, string>;
/**
 * Returns the two shader anchor colours (`base`, `accent`) for a metallic
 * body's procedural fragment shader (smooth-sphere view). Reads them from
 * the caller-supplied `metallicBands` (first and last band — deep + peak);
 * falls back to a neutral grey pair when the caller omits the bands.
 *
 * The lib no longer ships a temperature → composition colour map — the
 * caller owns that catalogue and writes the result back onto
 * `BodyConfig.metallicBands` (see the playground's metallic composition
 * helper for a reference implementation).
 */
export declare function metallicShaderColors(config: PlanetConfig): {
    baseA: string;
    baseB: string;
};
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