Description:

source/libvpx/vp8/decoder/dboolhuff.h

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE 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.
  */
 
 
-#ifndef DBOOLHUFF_H
-#define DBOOLHUFF_H
+#ifndef DBOOLHUFF_H_
+#define DBOOLHUFF_H_
+
 #include <stddef.h>
 #include <limits.h>
+
 #include "vpx_config.h"
 #include "vpx_ports/mem.h"
 #include "vpx/vpx_integer.h"
 
 typedef size_t VP8_BD_VALUE;
 
-# define VP8_BD_VALUE_SIZE ((int)sizeof(VP8_BD_VALUE)*CHAR_BIT)
+#define VP8_BD_VALUE_SIZE ((int)sizeof(VP8_BD_VALUE)*CHAR_BIT)
+
 /*This is meant to be a large, positive constant that can still be efficiently
    loaded as an immediate (on platforms like ARM, for example).
   Even relatively modest values like 100 would work fine.*/
-# define VP8_LOTS_OF_BITS (0x40000000)
+#define VP8_LOTS_OF_BITS (0x40000000)
 
 typedef struct
 {
     const unsigned char *user_buffer_end;
     const unsigned char *user_buffer;
     VP8_BD_VALUE         value;
     int                  count;
     unsigned int         range;
 } BOOL_DECODER;
 
 DECLARE_ALIGNED(16, extern const unsigned char, vp8_norm[256]);
 
 int vp8dx_start_decode(BOOL_DECODER *br,
                        const unsigned char *source,
                        unsigned int source_sz);
 
 void vp8dx_bool_decoder_fill(BOOL_DECODER *br);
 
-/*The refill loop is used in several places, so define it in a macro to make
-   sure they're all consistent.
-  An inline function would be cleaner, but has a significant penalty, because
-   multiple BOOL_DECODER fields must be modified, and the compiler is not smart
-   enough to eliminate the stores to those fields and the subsequent reloads
-   from them when inlining the function.*/
-#define VP8DX_BOOL_DECODER_FILL(_count,_value,_bufptr,_bufend) \
-    do \
-    { \
-        int shift = VP8_BD_VALUE_SIZE - 8 - ((_count) + 8); \
-        int loop_end, x; \
-        size_t bits_left = ((_bufend)-(_bufptr))*CHAR_BIT; \
-        \
-        x = (int)(shift + CHAR_BIT - bits_left); \
-        loop_end = 0; \
-        if(x >= 0) \
-        { \
-            (_count) += VP8_LOTS_OF_BITS; \
-            loop_end = x; \
-            if(!bits_left) break; \
-        } \
-        while(shift >= loop_end) \
-        { \
-            (_count) += CHAR_BIT; \
-            (_value) |= (VP8_BD_VALUE)*(_bufptr)++ << shift; \
-            shift -= CHAR_BIT; \
-        } \
-    } \
-    while(0) \
-
 
 static int vp8dx_decode_bool(BOOL_DECODER *br, int probability) {
     unsigned int bit = 0;
     VP8_BD_VALUE value;
     unsigned int split;
     VP8_BD_VALUE bigsplit;
     int count;
     unsigned int range;
 
     split = 1 + (((br->range - 1) * probability) >> 8);
@@ skipping 59 matching lines @@
     {
        /* We have tried to decode bits after the end of
         * stream was encountered.
         */
         return 1;
     }
 
     /* No error. */
     return 0;
 }
-#endif
+
+#endif  // DBOOLHUFF_H_