import { CanvasViewport } from './CanvasViewport.js';
import type { Rect } from '../helpers/Rect.js';
import type { Widget } from '../widgets/Widget.js';
type DebugEvent = [rect: Rect, timestamp: number, isMerged: boolean];
export declare class DebuggableCanvasViewport extends CanvasViewport {
    /** The overlay canvas. Dirty rects are painted to this */
    readonly overlayCanvas: HTMLCanvasElement;
    /** The overlay canvas's context */
    readonly overlayContext: CanvasRenderingContext2D;
    /** The internal canvas with the overlay applied on top of it (output) */
    readonly outputCanvas: HTMLCanvasElement;
    /** The output canvas's context */
    readonly outputContext: CanvasRenderingContext2D;
    /** The list of recently pushed dirty rects, with their timestamps */
    readonly events: Set<DebugEvent>;
    /** Is the overlay enabled? Disabled by default */
    private _overlayEnabled;
    /** Does the overlay need to be updated? */
    private _overlayDirty;
    /** When was the last time the PPS was measured? */
    private _lastPPSMeasurement;
    /** Current PPS text value */
    private _ppsText;
    /** Paints since last measurement */
    private _paintCounter;
    constructor(child: Widget, resolution?: number, preventBleeding?: boolean, preventAtlasBleeding?: boolean, startingWidth?: number, startingHeight?: number);
    get overlayEnabled(): boolean;
    set overlayEnabled(overlayEnabled: boolean);
    updateOutputCanvas(): void;
    private addDebugEvent;
    pushDirtyRects(rects: Array<Rect>): void;
    pushDirtyRect(rect: Rect): void;
    resolveLayout(): boolean;
    paintToInternal(): null | Array<Rect>;
}
export {};