/**
 * Frame processing - extracts frames from video and blends them.
 *
 * @module lib/frameProcessor
 * @internal
 */
import type { NormalizedGlowOptions } from '../types';
/**
 * Draws a video frame and blends it with the previous one for smooth transitions.
 *
 * @param video - Video element to sample.
 * @param tempCtx - Temp canvas for extraction.
 * @param mainCtx - Main canvas for glow.
 * @param canvasWidth - Canvas width.
 * @param canvasHeight - Canvas height.
 * @param options - Options with blend weights.
 * @param lastImage - Previous frame data, or null.
 * @returns New frame data for next blend.
 *
 * @internal
 */
export declare function drawAndBlendFrame(video: HTMLVideoElement, tempCtx: CanvasRenderingContext2D, mainCtx: CanvasRenderingContext2D, canvasWidth: number, canvasHeight: number, options: NormalizedGlowOptions, lastImage: ImageData | null): ImageData | null;
/**
 * Blends two frames using weighted pixel averaging (modifies oldFrame in place).
 *
 * @param oldFrame - Previous frame (gets modified).
 * @param newFrame - New frame.
 * @param blendOld - Weight for old frame (0-1).
 * @param blendNew - Weight for new frame (0-1).
 * @returns Blended frame (same ref as oldFrame).
 *
 * @internal
 */
export declare function blendFrames(oldFrame: ImageData, newFrame: ImageData, blendOld: number, blendNew: number): ImageData;