import VideoFxConfig from './VideoFxConfig';
import { VideoFxStreamParameters } from './VideoFxStreamParameters';
/**
 * [[VideoFxCanvasOpsManager]] Mechanism drives the canvas based operations
 * for the VideoFxProcessor. This includes input stream resizing to segmentation model
 * dimensions and managing the canvas loading for background replacement.
 */
export declare class VideoFxCanvasOpsManager {
    private logger;
    private streamParameters;
    private inferenceCanvas;
    private inferenceCtx;
    private outputCanvas;
    private horizontalResizeScalar;
    private verticalResizeScalar;
    private backgroundReplacementCanvas;
    private backgroundReplacementImage;
    constructor(streamParameters: VideoFxStreamParameters, outputCanvas: HTMLCanvasElement);
    /**
     * Generate the raw image data in a format that is directly importable into
     * the segmentation model
     * @param inputCanvas
     * @returns ImageData
     */
    getInferenceInputData(inputCanvas: HTMLCanvasElement): ImageData;
    /**
     * Reconfigure the canvas operations/pipeline to fit the dimensions of the new
     * video stream, and resize background replacement canvas.
     * @param streamParameters an VideoFxStreamParameters object specifying stream dimensions
     */
    configureForStreamParameters(streamParameters: VideoFxStreamParameters): Promise<void>;
    /**
     * Configure the inference canvas so that write operations to the canvas
     * result in an image resizing.
     */
    private configureCanvasPipeline;
    /**
     * Return the background replacement canvas
     * @returns HTMLCanvasElement
     */
    getBackgroundReplacementCanvas(): HTMLCanvasElement;
    /**
     * Attempt to load custom replacement background image from URL, or the default background color.
     * The backgroundReplacementCanvas is then set from the loaded image.
     * @param effectConfig
     */
    loadReplacementBackground(effectConfig: VideoFxConfig): Promise<void>;
    /**
     * Draw loaded image on a canvas sized to the stream parameters, which is then set to the
     * backgroundReplacementCanvas member variable.
     * @param backgroundImage
     */
    private resizeAndSetReplacementImage;
    /**
     * Fill default color on a canvas sized to the stream parameters, which is then set to the
     * backgroundReplacementCanvas member variable.
     * @param defaultColor
     */
    private resizeAndSetReplacementColor;
    /**
     * Attempt to load background image from URL.
     * @param backgroundImageURL
     * @returns Promise<HTMLCanvasElement>
     */
    loadImage(backgroundImageURL: string): Promise<HTMLImageElement>;
}