The Tor Browser: media/libvpx/vp9/vp9_iface

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) 2013 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 #ifndef VP9_VP9_IFACE_COMMON_H_

    11 #define VP9_VP9_IFACE_COMMON_H_

    13 static void yuvconfig2image(vpx_image_t *img, const YV12_BUFFER_CONFIG  *yv12,

    14                             void *user_priv) {

    15   /** vpx_img_wrap() doesn't allow specifying independent strides for

    16     * the Y, U, and V planes, nor other alignment adjustments that

    17     * might be representable by a YV12_BUFFER_CONFIG, so we just

    18     * initialize all the fields.*/

    19   int bps = 12;

    20   if (yv12->uv_height == yv12->y_height) {

    21     if (yv12->uv_width == yv12->y_width) {

    22       img->fmt = VPX_IMG_FMT_I444;

    23       bps = 24;

    24     } else {

    25       img->fmt = VPX_IMG_FMT_I422;

    26       bps = 16;

    27     }

    28   } else {

    29     img->fmt = VPX_IMG_FMT_I420;

    30   }

    31   img->w = yv12->y_stride;

    32   img->h = ALIGN_POWER_OF_TWO(yv12->y_height + 2 * VP9BORDERINPIXELS, 3);

    33   img->d_w = yv12->y_crop_width;

    34   img->d_h = yv12->y_crop_height;

    35   img->x_chroma_shift = yv12->uv_width < yv12->y_width;

    36   img->y_chroma_shift = yv12->uv_height < yv12->y_height;

    37   img->planes[VPX_PLANE_Y] = yv12->y_buffer;

    38   img->planes[VPX_PLANE_U] = yv12->u_buffer;

    39   img->planes[VPX_PLANE_V] = yv12->v_buffer;

    40   img->planes[VPX_PLANE_ALPHA] = yv12->alpha_buffer;

    41   img->stride[VPX_PLANE_Y] = yv12->y_stride;

    42   img->stride[VPX_PLANE_U] = yv12->uv_stride;

    43   img->stride[VPX_PLANE_V] = yv12->uv_stride;

    44   img->stride[VPX_PLANE_ALPHA] = yv12->alpha_stride;

    45   img->bps = bps;

    46   img->user_priv = user_priv;

    47   img->img_data = yv12->buffer_alloc;

    48   img->img_data_owner = 0;

    49   img->self_allocd = 0;

    50 }

    52 static vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,

    53                                        YV12_BUFFER_CONFIG *yv12) {

    54   yv12->y_buffer = img->planes[VPX_PLANE_Y];

    55   yv12->u_buffer = img->planes[VPX_PLANE_U];

    56   yv12->v_buffer = img->planes[VPX_PLANE_V];

    57   yv12->alpha_buffer = img->planes[VPX_PLANE_ALPHA];

    59   yv12->y_crop_width  = img->d_w;

    60   yv12->y_crop_height = img->d_h;

    61   yv12->y_width  = img->d_w;

    62   yv12->y_height = img->d_h;

    64   yv12->uv_width = img->x_chroma_shift == 1 ? (1 + yv12->y_width) / 2

    65                                             : yv12->y_width;

    66   yv12->uv_height = img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2

    67                                              : yv12->y_height;

    69   yv12->alpha_width = yv12->alpha_buffer ? img->d_w : 0;

    70   yv12->alpha_height = yv12->alpha_buffer ? img->d_h : 0;

    72   yv12->y_stride = img->stride[VPX_PLANE_Y];

    73   yv12->uv_stride = img->stride[VPX_PLANE_U];

    74   yv12->alpha_stride = yv12->alpha_buffer ? img->stride[VPX_PLANE_ALPHA] : 0;

    76   yv12->border  = (img->stride[VPX_PLANE_Y] - img->w) / 2;

    77 #if CONFIG_ALPHA

    78   // For development purposes, force alpha to hold the same data a Y for now.

    79   yv12->alpha_buffer = yv12->y_buffer;

    80   yv12->alpha_width = yv12->y_width;

    81   yv12->alpha_height = yv12->y_height;

    82   yv12->alpha_stride = yv12->y_stride;

    83 #endif

    84   return VPX_CODEC_OK;

    85 }

    87 #endif  // VP9_VP9_IFACE_COMMON_H_

The Tor Browser / file revision

media/libvpx/vp9/vp9_iface_common.h@ac0c01689b40

media/libvpx/vp9/vp9_iface_common.h