import { tav } from '../tav';
import { AlphaType, ColorType } from '../types/types';
/**
 * A surface is used to render the video frames.
 * @category Engine
 */
export declare class TAVSurface {
    private ref;
    /**
     * Make a surface from a HTML canvas.
     * @param canvasOrSelector A canvas element or a selector of a canvas element.
     * @returns A surface.
     */
    static FromHtmlCanvas(canvasOrSelector: HTMLCanvasElement | string): TAVSurface;
    private static FromWebGLContext;
    private offscreenCanvas;
    /**
     * @ignore
     */
    webGLContextId: number;
    /**
     * @ignore
     */
    prepare?: () => void;
    /**
     * @ignore
     */
    present?: () => void;
    private constructor();
    /**
     * Returns the width in pixels of the surface.
     */
    width(): number;
    /**
     * Returns the height in pixels of the surface.
     */
    height(): number;
    /**
     * Update the size of surface, and reset the internal surface.
     */
    updateSize(): void;
    /**
     * Erases all pixels of this surface with transparent color. Returns true if the content has
     * changed.
     */
    clearAll(): void;
    /**
     * Free the cache created by the surface immediately. Can be called to reduce memory pressure.
     */
    freeCache(): void;
    /**
     * Copies pixels from current TAVSurface to dstPixels with specified color type, alpha type and
     * row bytes.
     */
    readPixels(colorType?: ColorType, alphaType?: AlphaType): Uint8Array;
    /**
     * Build native object
     * @returns The native TAVSurface object.
     */
    build(): Promise<tav.TAVSurface>;
    /**
     * release native object
     */
    release(): void;
}