quant_levels_utils.h

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// Copyright 2011 Google Inc. All Rights Reserved.

//

// Use of this source code is governed by a BSD-style license

// that can be found in the COPYING file in the root of the source

// tree. An additional intellectual property rights grant can be found

// in the file PATENTS. All contributing project authors may

// be found in the AUTHORS file in the root of the source tree.

// -----------------------------------------------------------------------------

//

// Alpha plane quantization utility

//

// Author:  Vikas Arora (vikasa@google.com)

#ifndef WEBP_UTILS_QUANT_LEVELS_UTILS_H_

#define WEBP_UTILS_QUANT_LEVELS_UTILS_H_

#include <stdlib.h>

#include "src/webp/types.h"

#ifdef __cplusplus

extern "C" {

#endif

// Replace the input 'data' of size 'width'x'height' with 'num-levels'

// quantized values. If not NULL, 'sse' will contain the sum of squared error.

// Valid range for 'num_levels' is [2, 256].

// Returns false in case of error (data is NULL, or parameters are invalid).

int QuantizeLevels(uint8_t* const data, int width, int height, int num_levels,

                   uint64_t* const sse);

#ifdef __cplusplus

}    // extern "C"

#endif

#endif  // WEBP_UTILS_QUANT_LEVELS_UTILS_H_