@expofp/floorplan/dist/esm/utils/rasterize-svg.d.ts

Interactive floor plan library for expos and events

/**
 * Whether these bytes are an SVG.
 *
 * The test reads a prefix, not the whole type. A server may send `image/svg+xml; charset=utf-8`,
 * and these images come from customer origins and CDNs, not only from this repository's own
 * server. An exact match lets that form through to `createImageBitmap`, which rejects SVG bytes,
 * and the image then disappears with no sign of why.
 * @param blob - The bytes to test.
 * @returns Whether the bytes are an SVG.
 */
export declare function isSvgBlob(blob: Blob): boolean;
/**
 * Draws an SVG into a canvas at its own intrinsic size.
 *
 * `createImageBitmap` refuses SVG bytes (`InvalidStateError`, measured in Chrome 153, even for an
 * SVG with an explicit `width` and `height`), so an SVG cannot travel to the atlas worker as it is.
 * An `<img>` element renders the same bytes. This function does that conversion once, at load time.
 * @param blob - The SVG bytes.
 * @returns The rasterized canvas, or null when the SVG does not render, or declares no size.
 */
export declare function rasterizeSvg(blob: Blob): Promise<HTMLCanvasElement | null>;
/**
 * Rasterizes an SVG and hands the pixels back as PNG bytes.
 *
 * The result is a `Blob` and not a canvas on purpose. A layer packs in the atlas worker only while
 * every one of its sources is a `Blob`, so one canvas among a thousand booth logos would drop the
 * whole layer back onto the main thread — the exact layer the worker exists for.
 * @param blob - The SVG bytes.
 * @returns The PNG bytes, or null when the SVG does not render.
 */
export declare function svgToPngBlob(blob: Blob): Promise<Blob | null>;
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