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605a712701
drop c_plusplus which is from a quite ancient pre-standard compiler Change-Id: I9e357b3292a6b52b14c2641ba11f4f872c04b7fb
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Alpha plane quantization utility
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//
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// Author: Vikas Arora (vikasa@google.com)
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#ifndef WEBP_UTILS_QUANT_LEVELS_H_
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#define WEBP_UTILS_QUANT_LEVELS_H_
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#include <stdlib.h>
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#include "../webp/types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Replace the input 'data' of size 'width'x'height' with 'num-levels'
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// quantized values. If not NULL, 'sse' will contain the sum of squared error.
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// Valid range for 'num_levels' is [2, 256].
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// Returns false in case of error (data is NULL, or parameters are invalid).
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int QuantizeLevels(uint8_t* const data, int width, int height, int num_levels,
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uint64_t* const sse);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* WEBP_UTILS_QUANT_LEVELS_H_ */
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