/**
 * In-place row reversal for a tightly-packed RGBA8 buffer. The first
 * `width * height * 4` bytes of `buf` are flipped vertically — handy
 * when bridging between GL bottom-up convention (what `gl.readPixels`
 * writes) and the top-down convention that DOM / Skia / `ImageData`
 * use.
 *
 * Bytes beyond the first `width * height * 4` are untouched, so it's
 * safe to call on an oversize arena.
 */
export declare function flipRgba8RowsInPlace(buf: Uint8Array | Uint8ClampedArray, width: number, height: number): void;
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