mirror of
https://github.com/webmproject/libwebp.git
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0de3096b3a
This proved being ok, even for large pictures, provided one takes care of overflow. When an overflow is bound to occur, the counters are renormalized. Overall, shaves ~12k of memory. Change-Id: I2ba21a407964fe1a34c352371cba15166e0c4548
49 lines
1.6 KiB
C
49 lines
1.6 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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// Cost tables for level and modes.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#ifndef WEBP_ENC_COST_H_
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#define WEBP_ENC_COST_H_
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#include "./vp8enci.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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extern const uint16_t VP8LevelFixedCosts[2048]; // approximate cost per level
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extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p)
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// Cost of coding one event with probability 'proba'.
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static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) {
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return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba];
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}
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// Level cost calculations
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extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2];
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void VP8CalculateLevelCosts(VP8Proba* const proba);
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static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) {
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return VP8LevelFixedCosts[level]
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+ table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level];
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}
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// Mode costs
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extern const uint16_t VP8FixedCostsUV[4];
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extern const uint16_t VP8FixedCostsI16[4];
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extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES];
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//------------------------------------------------------------------------------
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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_ENC_COST_H_ */
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