/**
 * Gradient fill rendering for paths
 */
import type { GlyphPath } from "../render/path.ts";
import { type Bitmap, type RasterizeOptions } from "./types.ts";
/**
 * Color stop in a gradient (RGBA, 0-255 each)
 */
export interface ColorStop {
    /** Position along gradient, 0.0 to 1.0 */
    offset: number;
    /** RGBA color values, 0-255 each */
    color: [number, number, number, number];
}
/**
 * Linear gradient from point (x0,y0) to (x1,y1)
 */
export interface LinearGradient {
    type: "linear";
    /** Start X coordinate */
    x0: number;
    /** Start Y coordinate */
    y0: number;
    /** End X coordinate */
    x1: number;
    /** End Y coordinate */
    y1: number;
    /** Color stops */
    stops: ColorStop[];
}
/**
 * Radial gradient from center point with radius
 */
export interface RadialGradient {
    type: "radial";
    /** Center X coordinate */
    cx: number;
    /** Center Y coordinate */
    cy: number;
    /** Gradient radius */
    radius: number;
    /** Color stops */
    stops: ColorStop[];
}
/**
 * Gradient type union
 */
export type Gradient = LinearGradient | RadialGradient;
/**
 * Get color at position in gradient
 *
 * @param gradient Linear or radial gradient definition
 * @param x X coordinate
 * @param y Y coordinate
 * @returns RGBA color at position (0-255 each)
 */
export declare function interpolateGradient(gradient: Gradient, x: number, y: number): [number, number, number, number];
/**
 * Create a bitmap filled with gradient (no path)
 *
 * @param width Width in pixels
 * @param height Height in pixels
 * @param gradient Linear or radial gradient definition
 * @returns RGBA bitmap filled with gradient
 */
export declare function createGradientBitmap(width: number, height: number, gradient: Gradient): Bitmap;
/**
 * Rasterize path with gradient fill
 * First rasterizes path to get coverage mask, then fills with gradient
 *
 * @param path Glyph path to rasterize
 * @param gradient Linear or radial gradient definition
 * @param options Rasterization options (width, height, scale, etc.)
 * @returns RGBA bitmap with gradient-filled path
 */
export declare function rasterizePathWithGradient(path: GlyphPath, gradient: Gradient, options: RasterizeOptions): Bitmap;