/**
 * Minimal, pure-JS PNG encoder — no compression, no dependencies.
 *
 * Used as a deterministic fallback when no browser canvas (`OffscreenCanvas`,
 * `convertToBlob`) is available — typically the Node-side vitest environment
 * for the BrowserQuiltRenderer determinism tests, plus headless / SSR paths
 * where Three.js can't render.
 *
 * Encodes RGBA8 pixels as a single PNG with one uncompressed DEFLATE block
 * inside the IDAT chunk. Spec-compliant per RFC 1950 + RFC 1951 + ISO PNG.
 *
 * @see W.067a: Content hashes must be stable cross-platform — pure JS encode
 *      with no library dependency means the same input bytes produce the same
 *      PNG bytes on every runtime, which is what the BrowserQuiltRenderer
 *      determinism test asserts via SHA-256.
 *
 * NOT a general-purpose PNG library. Output is uncompressed (~4x larger than
 * a real encoder). Browser bundle: ~2KB. Use `OffscreenCanvas.convertToBlob`
 * in production browser paths for compression.
 */
/**
 * Encode RGBA8 pixels as a deterministic PNG byte stream. No compression
 * (uses stored DEFLATE blocks) so the output bytes are 100% deterministic
 * across runtimes. Suitable for snapshot tests and content-addressed
 * hashing of QuiltRenderer output.
 *
 * @param rgba   Row-major RGBA bytes, length = width * height * 4
 * @param width  Image width in pixels
 * @param height Image height in pixels
 */
export declare function encodePngRgba(rgba: Uint8Array, width: number, height: number): Uint8Array;
//# sourceMappingURL=pngEncoder.d.ts.map