d73e63a726
will be called by alpha post-processing, although doing nothing for now. Gradient smoothing would be nice-to-have here. Patch welcome! Change-Id: I534cde866bdc75da22d0f0a6d1373c90e21366f3
40 lines
1.3 KiB
C
40 lines
1.3 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: vikasa@google.com (Vikas Arora)
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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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#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, 'mse' will contain the mean-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* data, int width, int height, int num_levels,
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float* mse);
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// Apply post-processing to input 'data' of size 'width'x'height' assuming
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// source what 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* 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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