libwebp: update to 0.4.2-rc2

third_party/libwebp/enc/cost.h

 // 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.
 // -----------------------------------------------------------------------------
 //
 // Cost tables for level and modes.
@@ skipping 24 matching lines @@
   CostArray*  cost;
 } VP8Residual;
 
 void VP8InitResidual(int first, int coeff_type,
                      VP8Encoder* const enc, VP8Residual* const res);
 
 typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs,
                                          VP8Residual* const res);
 extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs;
 
-extern void VP8SetResidualCoeffsInit(void);  // must be called first
+void VP8SetResidualCoeffsInit(void);  // must be called first
 
 int VP8RecordCoeffs(int ctx, const VP8Residual* const res);
 
 // approximate cost per level:
 extern const uint16_t VP8LevelFixedCosts[MAX_LEVEL + 1];
 extern const uint16_t VP8EntropyCost[256];        // 8bit fixed-point log(p)
 
 // Cost of coding one event with probability 'proba'.
 static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) {
   return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba];
 }
 
 // Cost calculation function.
 typedef int (*VP8GetResidualCostFunc)(int ctx0, const VP8Residual* const res);
 extern VP8GetResidualCostFunc VP8GetResidualCost;
 
-extern void VP8GetResidualCostInit(void);  // must be called first
+void VP8GetResidualCostInit(void);  // must be called first
 
 // Level cost calculations
 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2];
 void VP8CalculateLevelCosts(VP8Proba* const proba);
 static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) {
   return VP8LevelFixedCosts[level]
        + table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level];
 }
 
 // Mode costs
 extern const uint16_t VP8FixedCostsUV[4];
 extern const uint16_t VP8FixedCostsI16[4];
 extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES];
 
 //------------------------------------------------------------------------------
 
 #ifdef __cplusplus
 }    // extern "C"
 #endif
 
 #endif  /* WEBP_ENC_COST_H_ */