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      1 /*
      2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 
     12 #include "treewriter.h"
     13 
     14 static void cost(
     15     int *const C,
     16     vp8_tree T,
     17     const vp8_prob *const P,
     18     int i,
     19     int c
     20 )
     21 {
     22     const vp8_prob p = P [i>>1];
     23 
     24     do
     25     {
     26         const vp8_tree_index j = T[i];
     27         const int d = c + vp8_cost_bit(p, i & 1);
     28 
     29         if (j <= 0)
     30             C[-j] = d;
     31         else
     32             cost(C, T, P, j, d);
     33     }
     34     while (++i & 1);
     35 }
     36 void vp8_cost_tokens(int *c, const vp8_prob *p, vp8_tree t)
     37 {
     38     cost(c, t, p, 0, 0);
     39 }
     40 void vp8_cost_tokens2(int *c, const vp8_prob *p, vp8_tree t,int start)
     41 {
     42     cost(c, t, p, start, 0);
     43 }
     44