The Tor Browser: media/libvpx/vp8/common/reconinter.c@ac0c01689b40 (annotated)

media/libvpx/vp8/common/reconinter.c@ac0c01689b40 (annotated)

media/libvpx/vp8/common/reconinter.c

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

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.

 /*
  *  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.
  */
 #include <limits.h>
 #include "vpx_config.h"
 #include "vp8_rtcd.h"
 #include "vpx/vpx_integer.h"
 #include "blockd.h"
 #include "reconinter.h"
 #if CONFIG_RUNTIME_CPU_DETECT
 #include "onyxc_int.h"
 #endif
 void vp8_copy_mem16x16_c(
     unsigned char *src,
     int src_stride,
     unsigned char *dst,
     int dst_stride)
 {
     int r;
     for (r = 0; r < 16; r++)
     {
 #if !(CONFIG_FAST_UNALIGNED)
         dst[0] = src[0];
         dst[1] = src[1];
         dst[2] = src[2];
         dst[3] = src[3];
         dst[4] = src[4];
         dst[5] = src[5];
         dst[6] = src[6];
         dst[7] = src[7];
         dst[8] = src[8];
         dst[9] = src[9];
         dst[10] = src[10];
         dst[11] = src[11];
         dst[12] = src[12];
         dst[13] = src[13];
         dst[14] = src[14];
         dst[15] = src[15];
 #else
         ((uint32_t *)dst)[0] = ((uint32_t *)src)[0] ;
         ((uint32_t *)dst)[1] = ((uint32_t *)src)[1] ;
         ((uint32_t *)dst)[2] = ((uint32_t *)src)[2] ;
         ((uint32_t *)dst)[3] = ((uint32_t *)src)[3] ;
 #endif
         src += src_stride;
         dst += dst_stride;
     }
 }
 void vp8_copy_mem8x8_c(
     unsigned char *src,
     int src_stride,
     unsigned char *dst,
     int dst_stride)
 {
     int r;
     for (r = 0; r < 8; r++)
     {
 #if !(CONFIG_FAST_UNALIGNED)
         dst[0] = src[0];
         dst[1] = src[1];
         dst[2] = src[2];
         dst[3] = src[3];
         dst[4] = src[4];
         dst[5] = src[5];
         dst[6] = src[6];
         dst[7] = src[7];
 #else
         ((uint32_t *)dst)[0] = ((uint32_t *)src)[0] ;
         ((uint32_t *)dst)[1] = ((uint32_t *)src)[1] ;
 #endif
         src += src_stride;
         dst += dst_stride;
     }
 }
 void vp8_copy_mem8x4_c(
     unsigned char *src,
     int src_stride,
     unsigned char *dst,
     int dst_stride)
 {
     int r;
     for (r = 0; r < 4; r++)
     {
 #if !(CONFIG_FAST_UNALIGNED)
         dst[0] = src[0];
         dst[1] = src[1];
         dst[2] = src[2];
         dst[3] = src[3];
         dst[4] = src[4];
         dst[5] = src[5];
         dst[6] = src[6];
         dst[7] = src[7];
 #else
         ((uint32_t *)dst)[0] = ((uint32_t *)src)[0] ;
         ((uint32_t *)dst)[1] = ((uint32_t *)src)[1] ;
 #endif
         src += src_stride;
         dst += dst_stride;
     }
 }
 void vp8_build_inter_predictors_b(BLOCKD *d, int pitch, unsigned char *base_pre, int pre_stride, vp8_subpix_fn_t sppf)
 {
     int r;
     unsigned char *pred_ptr = d->predictor;
     unsigned char *ptr;
     ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
     if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
     {
         sppf(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, pred_ptr, pitch);
     }
     else
     {
         for (r = 0; r < 4; r++)
         {
             pred_ptr[0]  = ptr[0];
             pred_ptr[1]  = ptr[1];
             pred_ptr[2]  = ptr[2];
             pred_ptr[3]  = ptr[3];
             pred_ptr     += pitch;
             ptr         += pre_stride;
         }
     }
 }
 static void build_inter_predictors4b(MACROBLOCKD *x, BLOCKD *d, unsigned char *dst, int dst_stride, unsigned char *base_pre, int pre_stride)
 {
     unsigned char *ptr;
     ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
     if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
     {
         x->subpixel_predict8x8(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, dst, dst_stride);
     }
     else
     {
         vp8_copy_mem8x8(ptr, pre_stride, dst, dst_stride);
     }
 }
 static void build_inter_predictors2b(MACROBLOCKD *x, BLOCKD *d, unsigned char *dst, int dst_stride, unsigned char *base_pre, int pre_stride)
 {
     unsigned char *ptr;
     ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
     if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
     {
         x->subpixel_predict8x4(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, dst, dst_stride);
     }
     else
     {
         vp8_copy_mem8x4(ptr, pre_stride, dst, dst_stride);
     }
 }
 static void build_inter_predictors_b(BLOCKD *d, unsigned char *dst, int dst_stride, unsigned char *base_pre, int pre_stride, vp8_subpix_fn_t sppf)
 {
     int r;
     unsigned char *ptr;
     ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
     if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
     {
         sppf(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, dst, dst_stride);
     }
     else
     {
         for (r = 0; r < 4; r++)
         {
           dst[0]  = ptr[0];
           dst[1]  = ptr[1];
           dst[2]  = ptr[2];
           dst[3]  = ptr[3];
           dst     += dst_stride;
           ptr     += pre_stride;
         }
     }
 }
 /*encoder only*/
 void vp8_build_inter16x16_predictors_mbuv(MACROBLOCKD *x)
 {
     unsigned char *uptr, *vptr;
     unsigned char *upred_ptr = &x->predictor[256];
     unsigned char *vpred_ptr = &x->predictor[320];
     int mv_row = x->mode_info_context->mbmi.mv.as_mv.row;
     int mv_col = x->mode_info_context->mbmi.mv.as_mv.col;
     int offset;
     int pre_stride = x->pre.uv_stride;
     /* calc uv motion vectors */
     mv_row += 1 | (mv_row >> (sizeof(int) * CHAR_BIT - 1));
     mv_col += 1 | (mv_col >> (sizeof(int) * CHAR_BIT - 1));
     mv_row /= 2;
     mv_col /= 2;
     mv_row &= x->fullpixel_mask;
     mv_col &= x->fullpixel_mask;
     offset = (mv_row >> 3) * pre_stride + (mv_col >> 3);
     uptr = x->pre.u_buffer + offset;
     vptr = x->pre.v_buffer + offset;
     if ((mv_row | mv_col) & 7)
     {
         x->subpixel_predict8x8(uptr, pre_stride, mv_col & 7, mv_row & 7, upred_ptr, 8);
         x->subpixel_predict8x8(vptr, pre_stride, mv_col & 7, mv_row & 7, vpred_ptr, 8);
     }
     else
     {
         vp8_copy_mem8x8(uptr, pre_stride, upred_ptr, 8);
         vp8_copy_mem8x8(vptr, pre_stride, vpred_ptr, 8);
     }
 }
 /*encoder only*/
 void vp8_build_inter4x4_predictors_mbuv(MACROBLOCKD *x)
 {
     int i, j;
     int pre_stride = x->pre.uv_stride;
     unsigned char *base_pre;
     /* build uv mvs */
     for (i = 0; i < 2; i++)
     {
         for (j = 0; j < 2; j++)
         {
             int yoffset = i * 8 + j * 2;
             int uoffset = 16 + i * 2 + j;
             int voffset = 20 + i * 2 + j;
             int temp;
             temp = x->block[yoffset  ].bmi.mv.as_mv.row
                    + x->block[yoffset+1].bmi.mv.as_mv.row
                    + x->block[yoffset+4].bmi.mv.as_mv.row
                    + x->block[yoffset+5].bmi.mv.as_mv.row;
             temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
             x->block[uoffset].bmi.mv.as_mv.row = (temp / 8) & x->fullpixel_mask;
             temp = x->block[yoffset  ].bmi.mv.as_mv.col
                    + x->block[yoffset+1].bmi.mv.as_mv.col
                    + x->block[yoffset+4].bmi.mv.as_mv.col
                    + x->block[yoffset+5].bmi.mv.as_mv.col;
             temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
             x->block[uoffset].bmi.mv.as_mv.col = (temp / 8) & x->fullpixel_mask;
             x->block[voffset].bmi.mv.as_int = x->block[uoffset].bmi.mv.as_int;
         }
     }
     base_pre = x->pre.u_buffer;
     for (i = 16; i < 20; i += 2)
     {
         BLOCKD *d0 = &x->block[i];
         BLOCKD *d1 = &x->block[i+1];
         if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
             build_inter_predictors2b(x, d0, d0->predictor, 8, base_pre, pre_stride);
         else
         {
             vp8_build_inter_predictors_b(d0, 8, base_pre, pre_stride, x->subpixel_predict);
             vp8_build_inter_predictors_b(d1, 8, base_pre, pre_stride, x->subpixel_predict);
         }
     }
     base_pre = x->pre.v_buffer;
     for (i = 20; i < 24; i += 2)
     {
         BLOCKD *d0 = &x->block[i];
         BLOCKD *d1 = &x->block[i+1];
         if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
             build_inter_predictors2b(x, d0, d0->predictor, 8, base_pre, pre_stride);
         else
         {
             vp8_build_inter_predictors_b(d0, 8, base_pre, pre_stride, x->subpixel_predict);
             vp8_build_inter_predictors_b(d1, 8, base_pre, pre_stride, x->subpixel_predict);
         }
     }
 }
 /*encoder only*/
 void vp8_build_inter16x16_predictors_mby(MACROBLOCKD *x,
                                          unsigned char *dst_y,
                                          int dst_ystride)
 {
     unsigned char *ptr_base;
     unsigned char *ptr;
     int mv_row = x->mode_info_context->mbmi.mv.as_mv.row;
     int mv_col = x->mode_info_context->mbmi.mv.as_mv.col;
     int pre_stride = x->pre.y_stride;
     ptr_base = x->pre.y_buffer;
     ptr = ptr_base + (mv_row >> 3) * pre_stride + (mv_col >> 3);
     if ((mv_row | mv_col) & 7)
     {
         x->subpixel_predict16x16(ptr, pre_stride, mv_col & 7, mv_row & 7,
                                  dst_y, dst_ystride);
     }
     else
     {
         vp8_copy_mem16x16(ptr, pre_stride, dst_y,
             dst_ystride);
     }
 }
 static void clamp_mv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
 {
     /* If the MV points so far into the UMV border that no visible pixels
      * are used for reconstruction, the subpel part of the MV can be
      * discarded and the MV limited to 16 pixels with equivalent results.
      *
      * This limit kicks in at 19 pixels for the top and left edges, for
      * the 16 pixels plus 3 taps right of the central pixel when subpel
      * filtering. The bottom and right edges use 16 pixels plus 2 pixels
      * left of the central pixel when filtering.
      */
     if (mv->col < (xd->mb_to_left_edge - (19 << 3)))
         mv->col = xd->mb_to_left_edge - (16 << 3);
     else if (mv->col > xd->mb_to_right_edge + (18 << 3))
         mv->col = xd->mb_to_right_edge + (16 << 3);
     if (mv->row < (xd->mb_to_top_edge - (19 << 3)))
         mv->row = xd->mb_to_top_edge - (16 << 3);
     else if (mv->row > xd->mb_to_bottom_edge + (18 << 3))
         mv->row = xd->mb_to_bottom_edge + (16 << 3);
 }
 /* A version of the above function for chroma block MVs.*/
 static void clamp_uvmv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
 {
     mv->col = (2*mv->col < (xd->mb_to_left_edge - (19 << 3))) ?
         (xd->mb_to_left_edge - (16 << 3)) >> 1 : mv->col;
     mv->col = (2*mv->col > xd->mb_to_right_edge + (18 << 3)) ?
         (xd->mb_to_right_edge + (16 << 3)) >> 1 : mv->col;
     mv->row = (2*mv->row < (xd->mb_to_top_edge - (19 << 3))) ?
         (xd->mb_to_top_edge - (16 << 3)) >> 1 : mv->row;
     mv->row = (2*mv->row > xd->mb_to_bottom_edge + (18 << 3)) ?
         (xd->mb_to_bottom_edge + (16 << 3)) >> 1 : mv->row;
 }
 void vp8_build_inter16x16_predictors_mb(MACROBLOCKD *x,
                                         unsigned char *dst_y,
                                         unsigned char *dst_u,
                                         unsigned char *dst_v,
                                         int dst_ystride,
                                         int dst_uvstride)
 {
     int offset;
     unsigned char *ptr;
     unsigned char *uptr, *vptr;
     int_mv _16x16mv;
     unsigned char *ptr_base = x->pre.y_buffer;
     int pre_stride = x->pre.y_stride;
     _16x16mv.as_int = x->mode_info_context->mbmi.mv.as_int;
     if (x->mode_info_context->mbmi.need_to_clamp_mvs)
     {
         clamp_mv_to_umv_border(&_16x16mv.as_mv, x);
     }
     ptr = ptr_base + ( _16x16mv.as_mv.row >> 3) * pre_stride + (_16x16mv.as_mv.col >> 3);
     if ( _16x16mv.as_int & 0x00070007)
     {
         x->subpixel_predict16x16(ptr, pre_stride, _16x16mv.as_mv.col & 7,  _16x16mv.as_mv.row & 7, dst_y, dst_ystride);
     }
     else
     {
         vp8_copy_mem16x16(ptr, pre_stride, dst_y, dst_ystride);
     }
     /* calc uv motion vectors */
     _16x16mv.as_mv.row += 1 | (_16x16mv.as_mv.row >> (sizeof(int) * CHAR_BIT - 1));
     _16x16mv.as_mv.col += 1 | (_16x16mv.as_mv.col >> (sizeof(int) * CHAR_BIT - 1));
     _16x16mv.as_mv.row /= 2;
     _16x16mv.as_mv.col /= 2;
     _16x16mv.as_mv.row &= x->fullpixel_mask;
     _16x16mv.as_mv.col &= x->fullpixel_mask;
     pre_stride >>= 1;
     offset = ( _16x16mv.as_mv.row >> 3) * pre_stride + (_16x16mv.as_mv.col >> 3);
     uptr = x->pre.u_buffer + offset;
     vptr = x->pre.v_buffer + offset;
     if ( _16x16mv.as_int & 0x00070007)
     {
         x->subpixel_predict8x8(uptr, pre_stride, _16x16mv.as_mv.col & 7,  _16x16mv.as_mv.row & 7, dst_u, dst_uvstride);
         x->subpixel_predict8x8(vptr, pre_stride, _16x16mv.as_mv.col & 7,  _16x16mv.as_mv.row & 7, dst_v, dst_uvstride);
     }
     else
     {
         vp8_copy_mem8x8(uptr, pre_stride, dst_u, dst_uvstride);
         vp8_copy_mem8x8(vptr, pre_stride, dst_v, dst_uvstride);
     }
 }
 static void build_inter4x4_predictors_mb(MACROBLOCKD *x)
 {
     int i;
     unsigned char *base_dst = x->dst.y_buffer;
     unsigned char *base_pre = x->pre.y_buffer;
     if (x->mode_info_context->mbmi.partitioning < 3)
     {
         BLOCKD *b;
         int dst_stride = x->dst.y_stride;
         x->block[ 0].bmi = x->mode_info_context->bmi[ 0];
         x->block[ 2].bmi = x->mode_info_context->bmi[ 2];
         x->block[ 8].bmi = x->mode_info_context->bmi[ 8];
         x->block[10].bmi = x->mode_info_context->bmi[10];
         if (x->mode_info_context->mbmi.need_to_clamp_mvs)
         {
             clamp_mv_to_umv_border(&x->block[ 0].bmi.mv.as_mv, x);
             clamp_mv_to_umv_border(&x->block[ 2].bmi.mv.as_mv, x);
             clamp_mv_to_umv_border(&x->block[ 8].bmi.mv.as_mv, x);
             clamp_mv_to_umv_border(&x->block[10].bmi.mv.as_mv, x);
         }
         b = &x->block[ 0];
         build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
         b = &x->block[ 2];
         build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
         b = &x->block[ 8];
         build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
         b = &x->block[10];
         build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
     }
     else
     {
         for (i = 0; i < 16; i += 2)
         {
             BLOCKD *d0 = &x->block[i];
             BLOCKD *d1 = &x->block[i+1];
             int dst_stride = x->dst.y_stride;
             x->block[i+0].bmi = x->mode_info_context->bmi[i+0];
             x->block[i+1].bmi = x->mode_info_context->bmi[i+1];
             if (x->mode_info_context->mbmi.need_to_clamp_mvs)
             {
                 clamp_mv_to_umv_border(&x->block[i+0].bmi.mv.as_mv, x);
                 clamp_mv_to_umv_border(&x->block[i+1].bmi.mv.as_mv, x);
             }
             if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
                 build_inter_predictors2b(x, d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride);
             else
             {
                 build_inter_predictors_b(d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
                 build_inter_predictors_b(d1, base_dst + d1->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
             }
         }
     }
     base_dst = x->dst.u_buffer;
     base_pre = x->pre.u_buffer;
     for (i = 16; i < 20; i += 2)
     {
         BLOCKD *d0 = &x->block[i];
         BLOCKD *d1 = &x->block[i+1];
         int dst_stride = x->dst.uv_stride;
         /* Note: uv mvs already clamped in build_4x4uvmvs() */
         if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
             build_inter_predictors2b(x, d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride);
         else
         {
             build_inter_predictors_b(d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
             build_inter_predictors_b(d1, base_dst + d1->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
         }
     }
     base_dst = x->dst.v_buffer;
     base_pre = x->pre.v_buffer;
     for (i = 20; i < 24; i += 2)
     {
         BLOCKD *d0 = &x->block[i];
         BLOCKD *d1 = &x->block[i+1];
         int dst_stride = x->dst.uv_stride;
         /* Note: uv mvs already clamped in build_4x4uvmvs() */
         if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
             build_inter_predictors2b(x, d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride);
         else
         {
             build_inter_predictors_b(d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
             build_inter_predictors_b(d1, base_dst + d1->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
         }
     }
 }
 static
 void build_4x4uvmvs(MACROBLOCKD *x)
 {
     int i, j;
     for (i = 0; i < 2; i++)
     {
         for (j = 0; j < 2; j++)
         {
             int yoffset = i * 8 + j * 2;
             int uoffset = 16 + i * 2 + j;
             int voffset = 20 + i * 2 + j;
             int temp;
             temp = x->mode_info_context->bmi[yoffset + 0].mv.as_mv.row
                  + x->mode_info_context->bmi[yoffset + 1].mv.as_mv.row
                  + x->mode_info_context->bmi[yoffset + 4].mv.as_mv.row
                  + x->mode_info_context->bmi[yoffset + 5].mv.as_mv.row;
             temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
             x->block[uoffset].bmi.mv.as_mv.row = (temp / 8) & x->fullpixel_mask;
             temp = x->mode_info_context->bmi[yoffset + 0].mv.as_mv.col
                  + x->mode_info_context->bmi[yoffset + 1].mv.as_mv.col
                  + x->mode_info_context->bmi[yoffset + 4].mv.as_mv.col
                  + x->mode_info_context->bmi[yoffset + 5].mv.as_mv.col;
             temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
             x->block[uoffset].bmi.mv.as_mv.col = (temp / 8) & x->fullpixel_mask;
             if (x->mode_info_context->mbmi.need_to_clamp_mvs)
                 clamp_uvmv_to_umv_border(&x->block[uoffset].bmi.mv.as_mv, x);
             x->block[voffset].bmi.mv.as_int = x->block[uoffset].bmi.mv.as_int;
         }
     }
 }
 void vp8_build_inter_predictors_mb(MACROBLOCKD *xd)
 {
     if (xd->mode_info_context->mbmi.mode != SPLITMV)
     {
         vp8_build_inter16x16_predictors_mb(xd, xd->dst.y_buffer,
                                            xd->dst.u_buffer, xd->dst.v_buffer,
                                            xd->dst.y_stride, xd->dst.uv_stride);
     }
     else
     {
         build_4x4uvmvs(xd);
         build_inter4x4_predictors_mb(xd);
     }
 }

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media/libvpx/vp8/common/reconinter.c@ac0c01689b40 (annotated)

media/libvpx/vp8/common/reconinter.c