import { HitTestRoot } from '../events';
import { Matrix, MutableMatrix, Point } from '../math';
import { HitTestResult } from './hit-test';
import { PaintingContext } from './painting-context';
import { RenderObject } from './render-object';
import { RenderSingleChild } from './render-single-child';
/**
 * 渲染树的根节点，负责各类初始化和渲染管线工作
 *
 * RenderCanvas 持有唯一子节点 RenderObject
 */
export declare class RenderCanvas extends RenderSingleChild<RenderObject> implements HitTestRoot {
    private pipeline;
    private readonly eventManager;
    private clearOnFrame;
    private nativeEventBinding;
    private handleRequestVisualUpdate;
    private frameDirty;
    constructor();
    private handlePointerOver;
    get dpr(): number;
    set dpr(value: number);
    private _dpr;
    private get rasterizer();
    private _rasterizer?;
    private get surface();
    private _surface?;
    get el(): HTMLCanvasElement | undefined;
    set el(value: HTMLCanvasElement | undefined);
    private _el?;
    private drawFrame;
    private composeFrame;
    _rootTransform?: Matrix;
    private updateMatricesAndCreateNewRootLayer;
    prepareInitialFrame(): void;
    dispose(): void;
    get repaintBoundary(): boolean;
    _repaintBoundaryLocked: boolean;
    applyPaintTransform(child: RenderObject, transform: MutableMatrix): void;
    hitTest(result: HitTestResult, position: Point): boolean;
    private handleNativeEvents;
    hitTestFromRoot(position: Point): HitTestResult;
    paint(context: PaintingContext, offset: Point): void;
    private dispatchFrameEnd;
}