The Tor Browser: media/libvpx/vp8/encoder/segmentation.c@ac0c01689b40

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     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 #include "segmentation.h"

    13 #include "vpx_mem/vpx_mem.h"

    15 void vp8_update_gf_useage_maps(VP8_COMP *cpi, VP8_COMMON *cm, MACROBLOCK *x)

    16 {

    17     int mb_row, mb_col;

    19     MODE_INFO *this_mb_mode_info = cm->mi;

    21     x->gf_active_ptr = (signed char *)cpi->gf_active_flags;

    23     if ((cm->frame_type == KEY_FRAME) || (cm->refresh_golden_frame))

    24     {

    25         /* Reset Gf useage monitors */

    26         vpx_memset(cpi->gf_active_flags, 1, (cm->mb_rows * cm->mb_cols));

    27         cpi->gf_active_count = cm->mb_rows * cm->mb_cols;

    28     }

    29     else

    30     {

    31         /* for each macroblock row in image */

    32         for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)

    33         {

    34             /* for each macroblock col in image */

    35             for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)

    36             {

    38                 /* If using golden then set GF active flag if not already set.

    39                  * If using last frame 0,0 mode then leave flag as it is

    40                  * else if using non 0,0 motion or intra modes then clear

    41                  * flag if it is currently set

    42                  */

    43                 if ((this_mb_mode_info->mbmi.ref_frame == GOLDEN_FRAME) || (this_mb_mode_info->mbmi.ref_frame == ALTREF_FRAME))

    44                 {

    45                     if (*(x->gf_active_ptr) == 0)

    46                     {

    47                         *(x->gf_active_ptr) = 1;

    48                         cpi->gf_active_count ++;

    49                     }

    50                 }

    51                 else if ((this_mb_mode_info->mbmi.mode != ZEROMV) && *(x->gf_active_ptr))

    52                 {

    53                     *(x->gf_active_ptr) = 0;

    54                     cpi->gf_active_count--;

    55                 }

    57                 x->gf_active_ptr++;          /* Step onto next entry */

    58                 this_mb_mode_info++;         /* skip to next mb */

    60             }

    62             /* this is to account for the border */

    63             this_mb_mode_info++;

    64         }

    65     }

    66 }

The Tor Browser / file revision

media/libvpx/vp8/encoder/segmentation.c@ac0c01689b40

media/libvpx/vp8/encoder/segmentation.c