39 lines
1.4 KiB
C
39 lines
1.4 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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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 "../types.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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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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// Apply post-processing to input 'data' of size 'width'x'height' assuming
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// that the source was quantized to a reduced number of levels.
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// Returns false in case of error (data is NULL, invalid parameters, ...).
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int DequantizeLevels(uint8_t* const data, int width, int height);
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#if defined(__cplusplus) || defined(c_plusplus)
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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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