@woosh/meep-engine/src/engine/asset/loaders/image/jpeg/idct8x8_fixed.d.ts

Pure JavaScript game engine. Fully featured and production ready.

/**
 * Decode 8x8 block quantized DCT coefficients and inverse DCT transform.
 * This is a fixed-point implementation of the IDCT algorithm.
 *
 * This IDCT algorithm is taken from:
 *    Y. A. Reznik, A. T. Hinds, L. Yu, Z. Ni, and C-X. Zhang,
 *    "Efficient fixed-point approximations of the 8x8 inverse discrete
 *    cosine transform" (invited paper), Proc. SPIE Vol. 6696, Sep. 24, 2007.
 *
 * which is based on:
 *   Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz,
 *   "Practical Fast 1-D DCT Algorithms with 11 Multiplications",
 *   IEEE Intl. Conf. on Acoustics, Speech & Signal Processing, 1989,
 *   988-991.
 *
 * The stage numbers mentioned in the comments refer to Figure 1 in the Loeffler paper.
 *
 * @param {Int32Array} qt quantization table
 * @param {Int32Array} zz zigzag-ordered coefficients
 * @param {Uint8Array|Uint8ClampedArray} dataOut
 */
export function idct8x8_fixed(qt: Int32Array, zz: Int32Array, dataOut: Uint8Array | Uint8ClampedArray): void;
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