/********************************************************************************
 * Copyright (c) 2026 EclipseSource and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/
import { Action, ExportFormat, ExportMimeType, GModelRoot, PngExportOptions } from '@eclipse-glsp/sprotty';
import { DiagramExporter } from './diagram-exporter';
import { GLSPSvgExporter } from './glsp-svg-exporter';
/**
 * Default PNG strategy for the unified export registry. Reuses {@link GLSPSvgExporter}'s
 * SVG-rendering pipeline and rasterises the result client-side via `OffscreenCanvas`.
 * Adopters that need server-side rendering replace this binding with their own strategy.
 */
export declare class DefaultPngDiagramExporter implements DiagramExporter<PngExportOptions> {
    readonly format: ExportFormat;
    readonly mimeType: ExportMimeType;
    readonly encoding: "base64";
    protected svgExporter: GLSPSvgExporter;
    export(root: GModelRoot, options?: PngExportOptions, cause?: Action): Promise<string>;
    /**
     * Rewrite the root `<svg>` tag so its rendered size matches the target raster dimensions.
     * Replaces `width`/`height` attributes and strips conflicting `style` declarations
     * (the SVG exporter emits `width: …px !important` on the inline style for viewer-friendly
     * display, which would otherwise win over the attributes). The existing `viewBox`
     * preserves the vector coordinate system so the content scales without distortion.
     */
    protected applyRasterSize(svgString: string, width: number, height: number): string;
    protected computeDimensions(svgString: string, options: PngExportOptions): {
        width: number;
        height: number;
    };
    /**
     * Read the aspect ratio from the root `<svg>` tag's `viewBox`, falling back to the
     * `width`/`height` attributes. GLSP-emitted SVGs always carry a `viewBox` (set by the
     * underlying sprotty exporter), so the fallback is a defensive safeguard.
     */
    protected parseAspectRatio(svgString: string): number;
    protected rasterise(svgString: string, width: number, height: number, background: string): Promise<Blob>;
    protected bitmapFromSvgUrl(url: string): Promise<ImageBitmap>;
    protected blobToBase64(blob: Blob): Promise<string>;
}
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