import { IPDFViewerApplication } from '../options/pdf-viewer-application';
import * as i0 from "@angular/core";
/**
 * Formerly lowered `maxCanvasPixels` during two-finger gestures (#2939).
 *
 * It no longer does anything during gestures. The pages which were already on screen kept
 * their own canvas budget, so their resolution never changed, while the "restore" after
 * each gesture reset every visible page - its canvas, text, annotation and editor layers -
 * and could do so in the middle of the next pinch. pdf.js does not re-render the pages
 * during a zoom gesture anyway: it scales the existing canvases until the gesture pauses,
 * and caps the canvas area itself (`capCanvasAreaFactor`, the detail canvas).
 *
 * @deprecated Kept for API compatibility; it will be removed in a future major version.
 * Use `pdfDefaultOptions.maxCanvasPixels` to configure the canvas budget.
 */
export declare class IOSCanvasOptimizationService {
    /** @deprecated Does nothing. */
    initialize(_pdfViewerApplication: IPDFViewerApplication): void;
    /** The canvas budget of the documents opened from now on. */
    getCurrentCanvasSize(): number;
    /** @deprecated Always `false`: the service doesn't track gestures anymore. */
    isPinchingActive(): boolean;
    /**
     * Sets `pdfDefaultOptions.maxCanvasPixels`. Like that option, it applies to the
     * documents opened afterwards: the pages of an open document keep their budget.
     */
    setCanvasSize(maxCanvasPixels: number): void;
    /** @deprecated Does nothing. */
    destroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<IOSCanvasOptimizationService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<IOSCanvasOptimizationService>;
}