libwebp: update to 0.5.0

third_party/libwebp/enc/cost.h

Index: third_party/libwebp/enc/cost.h
diff --git a/third_party/libwebp/enc/cost.h b/third_party/libwebp/enc/cost.h
index 4e558952123bd9ed80e8718a26b345b211b35ffc..20960d6d74c0283688eefde24b3dae7dd62f57b1 100644
--- a/third_party/libwebp/enc/cost.h
+++ b/third_party/libwebp/enc/cost.h
@@ -24,46 +24,31 @@ extern "C" {
 
 // On-the-fly info about the current set of residuals. Handy to avoid
 // passing zillions of params.
-typedef struct {
+typedef struct VP8Residual VP8Residual;
+struct VP8Residual {
   int first;
   int last;
   const int16_t* coeffs;
 
   int coeff_type;
-  ProbaArray* prob;
-  StatsArray* stats;
-  CostArray*  cost;
-} VP8Residual;
+  ProbaArray*   prob;
+  StatsArray*   stats;
+  CostArrayPtr  costs;
+};
 
 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;
-
-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;
-
-void VP8GetResidualCostInit(void);  // must be called first
-
 // Level cost calculations
 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2];
-void VP8CalculateLevelCosts(VP8Proba* const proba);
+void VP8CalculateLevelCosts(VP8EncProba* 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];