The Tor Browser: media/libvpx/vp8/decoder/treereader.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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  */

    12 #ifndef TREEREADER_H_

    13 #define TREEREADER_H_

    15 #include "vp8/common/treecoder.h"

    16 #include "dboolhuff.h"

    18 typedef BOOL_DECODER vp8_reader;

    20 #define vp8_read vp8dx_decode_bool

    21 #define vp8_read_literal vp8_decode_value

    22 #define vp8_read_bit(R) vp8_read(R, vp8_prob_half)

    25 /* Intent of tree data structure is to make decoding trivial. */

    27 static int vp8_treed_read(

    28     vp8_reader *const r,        /* !!! must return a 0 or 1 !!! */

    29     vp8_tree t,

    30     const vp8_prob *const p

    31 )

    32 {

    33     register vp8_tree_index i = 0;

    35     while ((i = t[ i + vp8_read(r, p[i>>1])]) > 0) ;

    37     return -i;

    38 }

    40 #endif  // TREEREADER_H_

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