import type { CanvasAndContext } from './interfaces';
/**
 * Canvas factory used by pdfjs to create and manage `@napi-rs/canvas` instances during PDF rendering.
 *
 * pdfjs expects a canvas factory that implements `create`, `reset`, and `destroy` methods.
 * This class satisfies that contract using the native `@napi-rs/canvas` package, which provides
 * a Node.js-compatible canvas without requiring a browser environment.
 *
 * Callers (such as `processPdfPage`) create instances of this class and pass them to pdfjs
 * when rendering pages.
 */
export declare class NodeCanvasFactory {
    /**
     * Creates a new canvas and 2D rendering context with the specified dimensions.
     *
     * @param width - Width of the canvas in pixels. Must be greater than zero.
     * @param height - Height of the canvas in pixels. Must be greater than zero.
     * @returns A `CanvasAndContext` holding the newly created canvas and its 2D context.
     * @throws {AssertionError} If `width` or `height` is less than or equal to zero.
     */
    create(width: number, height: number): CanvasAndContext;
    /**
     * Resizes an existing canvas to the specified dimensions and refreshes its 2D context.
     *
     * Reassigns `canvasAndContext.context` to a new context from the resized canvas.
     * The existing canvas instance is reused; no new canvas is created.
     *
     * @param canvasAndContext - The canvas and context pair to resize. `canvas` must not be `null`.
     * @param width - New width in pixels. Must be greater than zero.
     * @param height - New height in pixels. Must be greater than zero.
     * @throws {AssertionError} If `canvasAndContext.canvas` is `null`.
     * @throws {AssertionError} If `width` or `height` is less than or equal to zero.
     */
    reset(canvasAndContext: CanvasAndContext, width: number, height: number): void;
    /**
     * Releases the canvas resources by zeroing its dimensions and setting both `canvas` and `context` to `null`.
     *
     * After this call, `canvasAndContext.canvas` and `canvasAndContext.context` are both `null`.
     * This method is called automatically by `processPdfPage` in the `finally` block to prevent
     * memory leaks after each page render.
     *
     * @param canvasAndContext - The canvas and context pair to destroy. `canvas` must not be `null`.
     * @throws {AssertionError} If `canvasAndContext.canvas` is `null`.
     */
    destroy(canvasAndContext: CanvasAndContext): void;
}