import { AcGeBox2d } from '@mlightcad/data-model';
/**
 * Utility class for converting CAD drawings to PNG format.
 *
 * This class provides functionality to export the current CAD drawing
 * to PNG format and download it as a file. It renders the current view
 * using WebGLRenderTarget for optimal performance without requiring
 * preserveDrawingBuffer to be enabled on the renderer.
 */
export declare class AcApPngConvertor {
    /**
     * Converts the current CAD drawing to PNG format and initiates download.
     *
     * This method:
     * - Retrieves the current view, renderer, scene, and camera
     * - Creates a WebGLRenderTarget for offscreen rendering
     * - Renders the scene to the render target
     * - Reads pixel data and flips it vertically to correct WebGL's upside-down rendering
     * - Creates a canvas with the pixel data
     * - Exports as PNG and downloads with timestamp-based filename
     *
     * @param bounds - Optional world coordinate bounding box to export.
     *                 If provided, the camera will zoom to fit this region.
     *                 If not provided, exports the current view.
     * @param longSide - Optional maximum dimension (width or height) in pixels.
     */
    convert(bounds?: AcGeBox2d, longSide?: number): void;
    /**
     * Resolves a pixel output size from a long-side target and aspect ratio.
     */
    private resolveOutputSize;
    /**
     * Computes render size using source aspect so final target can be center-cropped.
     */
    private resolveRenderSizeForCenterCrop;
    /**
     * Center-crops an RGBA pixel buffer from source to destination size.
     */
    private cropPixelsCentered;
    /**
     * Returns the world-space aspect ratio of bounds.
     */
    private getBoundsAspect;
    /**
     * Flips pixel data vertically to correct WebGL's upside-down rendering.
     *
     * WebGL renders images upside down (origin at bottom-left), so the pixel
     * data needs to be flipped to display correctly in standard image viewers.
     *
     * @param pixels - The raw pixel data from WebGL render target
     * @param width - Width of the image in pixels
     * @param height - Height of the image in pixels
     * @returns The vertically flipped pixel data
     * @private
     */
    private flipPixelsVertically;
    /**
     * Creates a canvas element from pixel data.
     *
     * @param pixels - The vertically flipped pixel data
     * @param width - Width of the image in pixels
     * @param height - Height of the image in pixels
     * @returns A canvas element containing the image
     * @private
     */
    private createCanvasFromPixels;
    /**
     * Creates a downloadable PNG file and triggers the download.
     *
     * This method:
     * - Exports the canvas to a PNG data URL
     * - Generates a timestamped filename
     * - Creates and triggers a download link
     *
     * @param canvas - The canvas element containing the image
     * @private
     */
    private createFileAndDownloadIt;
}
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