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

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

media/libvpx/vp8/common/postproc.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 "vpx_config.h"
 #include "vp8_rtcd.h"
 #include "vpx_scale_rtcd.h"
 #include "vpx_scale/yv12config.h"
 #include "postproc.h"
 #include "common.h"
 #include "vpx_scale/vpx_scale.h"
 #include "systemdependent.h"
 #include <limits.h>
 #include <math.h>
 #include <stdlib.h>
 #include <stdio.h>
 #define RGB_TO_YUV(t)                                                                       \
     ( (0.257*(float)(t>>16)) + (0.504*(float)(t>>8&0xff)) + (0.098*(float)(t&0xff)) + 16),  \
     (-(0.148*(float)(t>>16)) - (0.291*(float)(t>>8&0xff)) + (0.439*(float)(t&0xff)) + 128), \
     ( (0.439*(float)(t>>16)) - (0.368*(float)(t>>8&0xff)) - (0.071*(float)(t&0xff)) + 128)
 /* global constants */
 #if CONFIG_POSTPROC_VISUALIZER
 static const unsigned char MB_PREDICTION_MODE_colors[MB_MODE_COUNT][3] =
 {
     { RGB_TO_YUV(0x98FB98) },   /* PaleGreen */
     { RGB_TO_YUV(0x00FF00) },   /* Green */
     { RGB_TO_YUV(0xADFF2F) },   /* GreenYellow */
     { RGB_TO_YUV(0x228B22) },   /* ForestGreen */
     { RGB_TO_YUV(0x006400) },   /* DarkGreen */
     { RGB_TO_YUV(0x98F5FF) },   /* Cadet Blue */
     { RGB_TO_YUV(0x6CA6CD) },   /* Sky Blue */
     { RGB_TO_YUV(0x00008B) },   /* Dark blue */
     { RGB_TO_YUV(0x551A8B) },   /* Purple */
     { RGB_TO_YUV(0xFF0000) }    /* Red */
 };
 static const unsigned char B_PREDICTION_MODE_colors[B_MODE_COUNT][3] =
 {
     { RGB_TO_YUV(0x6633ff) },   /* Purple */
     { RGB_TO_YUV(0xcc33ff) },   /* Magenta */
     { RGB_TO_YUV(0xff33cc) },   /* Pink */
     { RGB_TO_YUV(0xff3366) },   /* Coral */
     { RGB_TO_YUV(0x3366ff) },   /* Blue */
     { RGB_TO_YUV(0xed00f5) },   /* Dark Blue */
     { RGB_TO_YUV(0x2e00b8) },   /* Dark Purple */
     { RGB_TO_YUV(0xff6633) },   /* Orange */
     { RGB_TO_YUV(0x33ccff) },   /* Light Blue */
     { RGB_TO_YUV(0x8ab800) },   /* Green */
     { RGB_TO_YUV(0xffcc33) },   /* Light Orange */
     { RGB_TO_YUV(0x33ffcc) },   /* Aqua */
     { RGB_TO_YUV(0x66ff33) },   /* Light Green */
     { RGB_TO_YUV(0xccff33) },   /* Yellow */
 };
 static const unsigned char MV_REFERENCE_FRAME_colors[MAX_REF_FRAMES][3] =
 {
     { RGB_TO_YUV(0x00ff00) },   /* Blue */
     { RGB_TO_YUV(0x0000ff) },   /* Green */
     { RGB_TO_YUV(0xffff00) },   /* Yellow */
     { RGB_TO_YUV(0xff0000) },   /* Red */
 };
 #endif
 static const short kernel5[] =
 {
 , 1, 4, 1, 1
 };
 const short vp8_rv[] =
 {
 , 5, 2, 2, 8, 12, 4, 9, 8, 3,
 , 3, 9, 0, 0, 0, 8, 3, 14, 4,
 , 1, 11, 14, 1, 14, 9, 6, 12, 11,
 , 6, 10, 0, 0, 8, 9, 0, 3, 14,
 , 11, 13, 4, 2, 9, 0, 3, 9, 6,
 , 2, 3, 14, 13, 1, 8, 2, 9, 7,
 , 3, 1, 13, 13, 6, 6, 5, 2, 7,
 , 9, 11, 8, 7, 3, 2, 0, 13, 13,
 , 4, 12, 5, 12, 10, 8, 10, 13, 10,
 , 14, 4, 10, 0, 8, 11, 1, 13, 7,
 , 14, 6, 14, 13, 2, 13, 5, 4, 4,
 , 10, 0, 5, 13, 2, 12, 7, 11, 13,
 , 0, 4, 10, 7, 2, 7, 2, 2, 5,
 , 4, 7, 3, 3, 14, 14, 5, 9, 13,
 , 14, 3, 6, 3, 0, 11, 8, 13, 1,
 , 1, 12, 0, 10, 9, 7, 6, 2, 8,
 , 2, 13, 7, 1, 13, 14, 7, 6, 7,
 , 6, 10, 11, 7, 8, 7, 5, 14, 8,
 , 4, 0, 8, 7, 10, 0, 8, 14, 11,
 , 12, 5, 7, 14, 3, 14, 5, 2, 6,
 , 12, 12, 8, 0, 11, 13, 1, 2, 0,
 , 10, 14, 7, 8, 0, 4, 11, 0, 8,
 , 3, 10, 5, 8, 0, 11, 6, 7, 8,
 , 7, 13, 9, 2, 5, 1, 5, 10, 2,
 , 3, 5, 6, 10, 8, 9, 4, 11, 14,
 , 10, 0, 5, 13, 2, 12, 7, 11, 13,
 , 0, 4, 10, 7, 2, 7, 2, 2, 5,
 , 4, 7, 3, 3, 14, 14, 5, 9, 13,
 , 14, 3, 6, 3, 0, 11, 8, 13, 1,
 , 1, 12, 0, 10, 9, 7, 6, 2, 8,
 , 2, 13, 7, 1, 13, 14, 7, 6, 7,
 , 6, 10, 11, 7, 8, 7, 5, 14, 8,
 , 4, 0, 8, 7, 10, 0, 8, 14, 11,
 , 12, 5, 7, 14, 3, 14, 5, 2, 6,
 , 12, 12, 8, 0, 11, 13, 1, 2, 0,
 , 10, 14, 7, 8, 0, 4, 11, 0, 8,
 , 3, 10, 5, 8, 0, 11, 6, 7, 8,
 , 7, 13, 9, 2, 5, 1, 5, 10, 2,
 , 3, 5, 6, 10, 8, 9, 4, 11, 14,
 , 8, 3, 7, 8, 5, 11, 4, 12, 3,
 , 9, 14, 8, 14, 13, 4, 3, 1, 2,
 , 6, 5, 4, 4, 11, 4, 6, 2, 1,
 , 8, 8, 12, 13, 5, 14, 10, 12, 13,
 , 9, 5, 5, 11, 10, 13, 9, 10, 13,
 };
 extern void vp8_blit_text(const char *msg, unsigned char *address, const int pitch);
 extern void vp8_blit_line(int x0, int x1, int y0, int y1, unsigned char *image, const int pitch);
 /***********************************************************************************************************
  */
 void vp8_post_proc_down_and_across_mb_row_c
 (
     unsigned char *src_ptr,
     unsigned char *dst_ptr,
     int src_pixels_per_line,
     int dst_pixels_per_line,
     int cols,
     unsigned char *f,
     int size
 )
 {
     unsigned char *p_src, *p_dst;
     int row;
     int col;
     unsigned char v;
     unsigned char d[4];
     for (row = 0; row < size; row++)
     {
         /* post_proc_down for one row */
         p_src = src_ptr;
         p_dst = dst_ptr;
         for (col = 0; col < cols; col++)
         {
             unsigned char p_above2 = p_src[col - 2 * src_pixels_per_line];
             unsigned char p_above1 = p_src[col - src_pixels_per_line];
             unsigned char p_below1 = p_src[col + src_pixels_per_line];
             unsigned char p_below2 = p_src[col + 2 * src_pixels_per_line];
             v = p_src[col];
             if ((abs(v - p_above2) < f[col]) && (abs(v - p_above1) < f[col])
                 && (abs(v - p_below1) < f[col]) && (abs(v - p_below2) < f[col]))
             {
                 unsigned char k1, k2, k3;
                 k1 = (p_above2 + p_above1 + 1) >> 1;
                 k2 = (p_below2 + p_below1 + 1) >> 1;
                 k3 = (k1 + k2 + 1) >> 1;
                 v = (k3 + v + 1) >> 1;
             }
             p_dst[col] = v;
         }
         /* now post_proc_across */
         p_src = dst_ptr;
         p_dst = dst_ptr;
         p_src[-2] = p_src[-1] = p_src[0];
         p_src[cols] = p_src[cols + 1] = p_src[cols - 1];
         for (col = 0; col < cols; col++)
         {
             v = p_src[col];
             if ((abs(v - p_src[col - 2]) < f[col])
                 && (abs(v - p_src[col - 1]) < f[col])
                 && (abs(v - p_src[col + 1]) < f[col])
                 && (abs(v - p_src[col + 2]) < f[col]))
             {
                 unsigned char k1, k2, k3;
                 k1 = (p_src[col - 2] + p_src[col - 1] + 1) >> 1;
                 k2 = (p_src[col + 2] + p_src[col + 1] + 1) >> 1;
                 k3 = (k1 + k2 + 1) >> 1;
                 v = (k3 + v + 1) >> 1;
             }
             d[col & 3] = v;
             if (col >= 2)
                 p_dst[col - 2] = d[(col - 2) & 3];
         }
         /* handle the last two pixels */
         p_dst[col - 2] = d[(col - 2) & 3];
         p_dst[col - 1] = d[(col - 1) & 3];
         /* next row */
         src_ptr += src_pixels_per_line;
         dst_ptr += dst_pixels_per_line;
     }
 }
 static int q2mbl(int x)
 {
     if (x < 20) x = 20;
     x = 50 + (x - 50) * 10 / 8;
     return x * x / 3;
 }
 void vp8_mbpost_proc_across_ip_c(unsigned char *src, int pitch, int rows, int cols, int flimit)
 {
     int r, c, i;
     unsigned char *s = src;
     unsigned char d[16];
     for (r = 0; r < rows; r++)
     {
         int sumsq = 0;
         int sum   = 0;
         for (i = -8; i<0; i++)
           s[i]=s[0];
         /* 17 avoids valgrind warning - we buffer values in c in d
          * and only write them when we've read 8 ahead...
          */
         for (i = cols; i<cols+17; i++)
           s[i]=s[cols-1];
         for (i = -8; i <= 6; i++)
         {
             sumsq += s[i] * s[i];
             sum   += s[i];
             d[i+8] = 0;
         }
         for (c = 0; c < cols + 8; c++)
         {
             int x = s[c+7] - s[c-8];
             int y = s[c+7] + s[c-8];
             sum  += x;
             sumsq += x * y;
             d[c&15] = s[c];
             if (sumsq * 15 - sum * sum < flimit)
             {
                 d[c&15] = (8 + sum + s[c]) >> 4;
             }
             s[c-8] = d[(c-8)&15];
         }
         s += pitch;
     }
 }
 void vp8_mbpost_proc_down_c(unsigned char *dst, int pitch, int rows, int cols, int flimit)
 {
     int r, c, i;
     const short *rv3 = &vp8_rv[63&rand()];
     for (c = 0; c < cols; c++ )
     {
         unsigned char *s = &dst[c];
         int sumsq = 0;
         int sum   = 0;
         unsigned char d[16];
         const short *rv2 = rv3 + ((c * 17) & 127);
         for (i = -8; i < 0; i++)
           s[i*pitch]=s[0];
         /* 17 avoids valgrind warning - we buffer values in c in d
          * and only write them when we've read 8 ahead...
          */
         for (i = rows; i < rows+17; i++)
           s[i*pitch]=s[(rows-1)*pitch];
         for (i = -8; i <= 6; i++)
         {
             sumsq += s[i*pitch] * s[i*pitch];
             sum   += s[i*pitch];
         }
         for (r = 0; r < rows + 8; r++)
         {
             sumsq += s[7*pitch] * s[ 7*pitch] - s[-8*pitch] * s[-8*pitch];
             sum  += s[7*pitch] - s[-8*pitch];
             d[r&15] = s[0];
             if (sumsq * 15 - sum * sum < flimit)
             {
                 d[r&15] = (rv2[r&127] + sum + s[0]) >> 4;
             }
             s[-8*pitch] = d[(r-8)&15];
             s += pitch;
         }
     }
 }
 static void vp8_de_mblock(YV12_BUFFER_CONFIG         *post,
                           int                         q)
 {
     vp8_mbpost_proc_across_ip(post->y_buffer, post->y_stride, post->y_height,
                               post->y_width, q2mbl(q));
     vp8_mbpost_proc_down(post->y_buffer, post->y_stride, post->y_height,
                          post->y_width, q2mbl(q));
 }
 void vp8_deblock(VP8_COMMON                 *cm,
                  YV12_BUFFER_CONFIG         *source,
                  YV12_BUFFER_CONFIG         *post,
                  int                         q,
                  int                         low_var_thresh,
                  int                         flag)
 {
     double level = 6.0e-05 * q * q * q - .0067 * q * q + .306 * q + .0065;
     int ppl = (int)(level + .5);
     const MODE_INFO *mode_info_context = cm->show_frame_mi;
     int mbr, mbc;
     /* The pixel thresholds are adjusted according to if or not the macroblock
      * is a skipped block.  */
     unsigned char *ylimits = cm->pp_limits_buffer;
     unsigned char *uvlimits = cm->pp_limits_buffer + 16 * cm->mb_cols;
     (void) low_var_thresh;
     (void) flag;
     if (ppl > 0)
     {
         for (mbr = 0; mbr < cm->mb_rows; mbr++)
         {
             unsigned char *ylptr = ylimits;
             unsigned char *uvlptr = uvlimits;
             for (mbc = 0; mbc < cm->mb_cols; mbc++)
             {
                 unsigned char mb_ppl;
                 if (mode_info_context->mbmi.mb_skip_coeff)
                     mb_ppl = (unsigned char)ppl >> 1;
                 else
                     mb_ppl = (unsigned char)ppl;
                 vpx_memset(ylptr, mb_ppl, 16);
                 vpx_memset(uvlptr, mb_ppl, 8);
                 ylptr += 16;
                 uvlptr += 8;
                 mode_info_context++;
             }
             mode_info_context++;
             vp8_post_proc_down_and_across_mb_row(
                 source->y_buffer + 16 * mbr * source->y_stride,
                 post->y_buffer + 16 * mbr * post->y_stride, source->y_stride,
                 post->y_stride, source->y_width, ylimits, 16);
             vp8_post_proc_down_and_across_mb_row(
                 source->u_buffer + 8 * mbr * source->uv_stride,
                 post->u_buffer + 8 * mbr * post->uv_stride, source->uv_stride,
                 post->uv_stride, source->uv_width, uvlimits, 8);
             vp8_post_proc_down_and_across_mb_row(
                 source->v_buffer + 8 * mbr * source->uv_stride,
                 post->v_buffer + 8 * mbr * post->uv_stride, source->uv_stride,
                 post->uv_stride, source->uv_width, uvlimits, 8);
         }
     } else
     {
         vp8_yv12_copy_frame(source, post);
     }
 }
 #if !(CONFIG_TEMPORAL_DENOISING)
 void vp8_de_noise(VP8_COMMON                 *cm,
                   YV12_BUFFER_CONFIG         *source,
                   YV12_BUFFER_CONFIG         *post,
                   int                         q,
                   int                         low_var_thresh,
                   int                         flag)
 {
     double level = 6.0e-05 * q * q * q - .0067 * q * q + .306 * q + .0065;
     int ppl = (int)(level + .5);
     int mb_rows = source->y_width >> 4;
     int mb_cols = source->y_height >> 4;
     unsigned char *limits = cm->pp_limits_buffer;;
     int mbr, mbc;
     (void) post;
     (void) low_var_thresh;
     (void) flag;
     vpx_memset(limits, (unsigned char)ppl, 16 * mb_cols);
     /* TODO: The original code don't filter the 2 outer rows and columns. */
     for (mbr = 0; mbr < mb_rows; mbr++)
     {
         vp8_post_proc_down_and_across_mb_row(
             source->y_buffer + 16 * mbr * source->y_stride,
             source->y_buffer + 16 * mbr * source->y_stride,
             source->y_stride, source->y_stride, source->y_width, limits, 16);
         vp8_post_proc_down_and_across_mb_row(
             source->u_buffer + 8 * mbr * source->uv_stride,
             source->u_buffer + 8 * mbr * source->uv_stride,
             source->uv_stride, source->uv_stride, source->uv_width, limits, 8);
         vp8_post_proc_down_and_across_mb_row(
             source->v_buffer + 8 * mbr * source->uv_stride,
             source->v_buffer + 8 * mbr * source->uv_stride,
             source->uv_stride, source->uv_stride, source->uv_width, limits, 8);
     }
 }
 #endif
 double vp8_gaussian(double sigma, double mu, double x)
 {
     return 1 / (sigma * sqrt(2.0 * 3.14159265)) *
            (exp(-(x - mu) * (x - mu) / (2 * sigma * sigma)));
 }
 static void fillrd(struct postproc_state *state, int q, int a)
 {
     char char_dist[300];
     double sigma;
     int i;
     vp8_clear_system_state();
     sigma = a + .5 + .6 * (63 - q) / 63.0;
     /* set up a lookup table of 256 entries that matches
      * a gaussian distribution with sigma determined by q.
      */
     {
         int next, j;
         next = 0;
         for (i = -32; i < 32; i++)
         {
             const int v = (int)(.5 + 256 * vp8_gaussian(sigma, 0, i));
             if (v)
             {
                 for (j = 0; j < v; j++)
                 {
                     char_dist[next+j] = (char) i;
                 }
                 next = next + j;
             }
         }
         for (; next < 256; next++)
             char_dist[next] = 0;
     }
     for (i = 0; i < 3072; i++)
     {
         state->noise[i] = char_dist[rand() & 0xff];
     }
     for (i = 0; i < 16; i++)
     {
         state->blackclamp[i] = -char_dist[0];
         state->whiteclamp[i] = -char_dist[0];
         state->bothclamp[i] = -2 * char_dist[0];
     }
     state->last_q = q;
     state->last_noise = a;
 }
 /****************************************************************************
  *
  *  ROUTINE       : plane_add_noise_c
  *
  *  INPUTS        : unsigned char *Start    starting address of buffer to add gaussian
  *                                  noise to
  *                  unsigned int Width    width of plane
  *                  unsigned int Height   height of plane
  *                  int  Pitch    distance between subsequent lines of frame
  *                  int  q        quantizer used to determine amount of noise
  *                                  to add
  *
  *  OUTPUTS       : None.
  *
  *  RETURNS       : void.
  *
  *  FUNCTION      : adds gaussian noise to a plane of pixels
  *
  *  SPECIAL NOTES : None.
  *
  ****************************************************************************/
 void vp8_plane_add_noise_c(unsigned char *Start, char *noise,
                            char blackclamp[16],
                            char whiteclamp[16],
                            char bothclamp[16],
                            unsigned int Width, unsigned int Height, int Pitch)
 {
     unsigned int i, j;
     for (i = 0; i < Height; i++)
     {
         unsigned char *Pos = Start + i * Pitch;
         char  *Ref = (char *)(noise + (rand() & 0xff));
         for (j = 0; j < Width; j++)
         {
             if (Pos[j] < blackclamp[0])
                 Pos[j] = blackclamp[0];
             if (Pos[j] > 255 + whiteclamp[0])
                 Pos[j] = 255 + whiteclamp[0];
             Pos[j] += Ref[j];
         }
     }
 }
 /* Blend the macro block with a solid colored square.  Leave the
  * edges unblended to give distinction to macro blocks in areas
  * filled with the same color block.
  */
 void vp8_blend_mb_inner_c (unsigned char *y, unsigned char *u, unsigned char *v,
                         int y_1, int u_1, int v_1, int alpha, int stride)
 {
     int i, j;
     int y1_const = y_1*((1<<16)-alpha);
     int u1_const = u_1*((1<<16)-alpha);
     int v1_const = v_1*((1<<16)-alpha);
     y += 2*stride + 2;
     for (i = 0; i < 12; i++)
     {
         for (j = 0; j < 12; j++)
         {
             y[j] = (y[j]*alpha + y1_const)>>16;
         }
         y += stride;
     }
     stride >>= 1;
     u += stride + 1;
     v += stride + 1;
     for (i = 0; i < 6; i++)
     {
         for (j = 0; j < 6; j++)
         {
             u[j] = (u[j]*alpha + u1_const)>>16;
             v[j] = (v[j]*alpha + v1_const)>>16;
         }
         u += stride;
         v += stride;
     }
 }
 /* Blend only the edge of the macro block.  Leave center
  * unblended to allow for other visualizations to be layered.
  */
 void vp8_blend_mb_outer_c (unsigned char *y, unsigned char *u, unsigned char *v,
                         int y_1, int u_1, int v_1, int alpha, int stride)
 {
     int i, j;
     int y1_const = y_1*((1<<16)-alpha);
     int u1_const = u_1*((1<<16)-alpha);
     int v1_const = v_1*((1<<16)-alpha);
     for (i = 0; i < 2; i++)
     {
         for (j = 0; j < 16; j++)
         {
             y[j] = (y[j]*alpha + y1_const)>>16;
         }
         y += stride;
     }
     for (i = 0; i < 12; i++)
     {
         y[0]  = (y[0]*alpha  + y1_const)>>16;
         y[1]  = (y[1]*alpha  + y1_const)>>16;
         y[14] = (y[14]*alpha + y1_const)>>16;
         y[15] = (y[15]*alpha + y1_const)>>16;
         y += stride;
     }
     for (i = 0; i < 2; i++)
     {
         for (j = 0; j < 16; j++)
         {
             y[j] = (y[j]*alpha + y1_const)>>16;
         }
         y += stride;
     }
     stride >>= 1;
     for (j = 0; j < 8; j++)
     {
         u[j] = (u[j]*alpha + u1_const)>>16;
         v[j] = (v[j]*alpha + v1_const)>>16;
     }
     u += stride;
     v += stride;
     for (i = 0; i < 6; i++)
     {
         u[0] = (u[0]*alpha + u1_const)>>16;
         v[0] = (v[0]*alpha + v1_const)>>16;
         u[7] = (u[7]*alpha + u1_const)>>16;
         v[7] = (v[7]*alpha + v1_const)>>16;
         u += stride;
         v += stride;
     }
     for (j = 0; j < 8; j++)
     {
         u[j] = (u[j]*alpha + u1_const)>>16;
         v[j] = (v[j]*alpha + v1_const)>>16;
     }
 }
 void vp8_blend_b_c (unsigned char *y, unsigned char *u, unsigned char *v,
                         int y_1, int u_1, int v_1, int alpha, int stride)
 {
     int i, j;
     int y1_const = y_1*((1<<16)-alpha);
     int u1_const = u_1*((1<<16)-alpha);
     int v1_const = v_1*((1<<16)-alpha);
     for (i = 0; i < 4; i++)
     {
         for (j = 0; j < 4; j++)
         {
             y[j] = (y[j]*alpha + y1_const)>>16;
         }
         y += stride;
     }
     stride >>= 1;
     for (i = 0; i < 2; i++)
     {
         for (j = 0; j < 2; j++)
         {
             u[j] = (u[j]*alpha + u1_const)>>16;
             v[j] = (v[j]*alpha + v1_const)>>16;
         }
         u += stride;
         v += stride;
     }
 }
 static void constrain_line (int x_0, int *x_1, int y_0, int *y_1, int width, int height)
 {
     int dx;
     int dy;
     if (*x_1 > width)
     {
         dx = *x_1 - x_0;
         dy = *y_1 - y_0;
         *x_1 = width;
         if (dx)
             *y_1 = ((width-x_0)*dy)/dx + y_0;
     }
     if (*x_1 < 0)
     {
         dx = *x_1 - x_0;
         dy = *y_1 - y_0;
         *x_1 = 0;
         if (dx)
             *y_1 = ((0-x_0)*dy)/dx + y_0;
     }
     if (*y_1 > height)
     {
         dx = *x_1 - x_0;
         dy = *y_1 - y_0;
         *y_1 = height;
         if (dy)
             *x_1 = ((height-y_0)*dx)/dy + x_0;
     }
     if (*y_1 < 0)
     {
         dx = *x_1 - x_0;
         dy = *y_1 - y_0;
         *y_1 = 0;
         if (dy)
             *x_1 = ((0-y_0)*dx)/dy + x_0;
     }
 }
 #if CONFIG_POSTPROC
 int vp8_post_proc_frame(VP8_COMMON *oci, YV12_BUFFER_CONFIG *dest, vp8_ppflags_t *ppflags)
 {
     int q = oci->filter_level * 10 / 6;
     int flags = ppflags->post_proc_flag;
     int deblock_level = ppflags->deblocking_level;
     int noise_level = ppflags->noise_level;
     if (!oci->frame_to_show)
         return -1;
     if (q > 63)
         q = 63;
     if (!flags)
     {
         *dest = *oci->frame_to_show;
         /* handle problem with extending borders */
         dest->y_width = oci->Width;
         dest->y_height = oci->Height;
         dest->uv_height = dest->y_height / 2;
         oci->postproc_state.last_base_qindex = oci->base_qindex;
         oci->postproc_state.last_frame_valid = 1;
         return 0;
     }
     /* Allocate post_proc_buffer_int if needed */
     if ((flags & VP8D_MFQE) && !oci->post_proc_buffer_int_used)
     {
         if ((flags & VP8D_DEBLOCK) || (flags & VP8D_DEMACROBLOCK))
         {
             int width = (oci->Width + 15) & ~15;
             int height = (oci->Height + 15) & ~15;
             if (vp8_yv12_alloc_frame_buffer(&oci->post_proc_buffer_int,
                                             width, height, VP8BORDERINPIXELS))
                 vpx_internal_error(&oci->error, VPX_CODEC_MEM_ERROR,
                                    "Failed to allocate MFQE framebuffer");
             oci->post_proc_buffer_int_used = 1;
             /* insure that postproc is set to all 0's so that post proc
              * doesn't pull random data in from edge
              */
             vpx_memset((&oci->post_proc_buffer_int)->buffer_alloc,128,(&oci->post_proc_buffer)->frame_size);
         }
     }
     vp8_clear_system_state();
     if ((flags & VP8D_MFQE) &&
          oci->postproc_state.last_frame_valid &&
          oci->current_video_frame >= 2 &&
          oci->postproc_state.last_base_qindex < 60 &&
          oci->base_qindex - oci->postproc_state.last_base_qindex >= 20)
     {
         vp8_multiframe_quality_enhance(oci);
         if (((flags & VP8D_DEBLOCK) || (flags & VP8D_DEMACROBLOCK)) &&
             oci->post_proc_buffer_int_used)
         {
             vp8_yv12_copy_frame(&oci->post_proc_buffer, &oci->post_proc_buffer_int);
             if (flags & VP8D_DEMACROBLOCK)
             {
                 vp8_deblock(oci, &oci->post_proc_buffer_int, &oci->post_proc_buffer,
                                                q + (deblock_level - 5) * 10, 1, 0);
                 vp8_de_mblock(&oci->post_proc_buffer,
                               q + (deblock_level - 5) * 10);
             }
             else if (flags & VP8D_DEBLOCK)
             {
                 vp8_deblock(oci, &oci->post_proc_buffer_int, &oci->post_proc_buffer,
                             q, 1, 0);
             }
         }
         /* Move partially towards the base q of the previous frame */
         oci->postproc_state.last_base_qindex = (3*oci->postproc_state.last_base_qindex + oci->base_qindex)>>2;
     }
     else if (flags & VP8D_DEMACROBLOCK)
     {
         vp8_deblock(oci, oci->frame_to_show, &oci->post_proc_buffer,
                                      q + (deblock_level - 5) * 10, 1, 0);
         vp8_de_mblock(&oci->post_proc_buffer, q + (deblock_level - 5) * 10);
         oci->postproc_state.last_base_qindex = oci->base_qindex;
     }
     else if (flags & VP8D_DEBLOCK)
     {
         vp8_deblock(oci, oci->frame_to_show, &oci->post_proc_buffer,
                     q, 1, 0);
         oci->postproc_state.last_base_qindex = oci->base_qindex;
     }
     else
     {
         vp8_yv12_copy_frame(oci->frame_to_show, &oci->post_proc_buffer);
         oci->postproc_state.last_base_qindex = oci->base_qindex;
     }
     oci->postproc_state.last_frame_valid = 1;
     if (flags & VP8D_ADDNOISE)
     {
         if (oci->postproc_state.last_q != q
             || oci->postproc_state.last_noise != noise_level)
         {
             fillrd(&oci->postproc_state, 63 - q, noise_level);
         }
         vp8_plane_add_noise
         (oci->post_proc_buffer.y_buffer,
          oci->postproc_state.noise,
          oci->postproc_state.blackclamp,
          oci->postproc_state.whiteclamp,
          oci->postproc_state.bothclamp,
          oci->post_proc_buffer.y_width, oci->post_proc_buffer.y_height,
          oci->post_proc_buffer.y_stride);
     }
 #if CONFIG_POSTPROC_VISUALIZER
     if (flags & VP8D_DEBUG_TXT_FRAME_INFO)
     {
         char message[512];
         sprintf(message, "F%1dG%1dQ%3dF%3dP%d_s%dx%d",
                 (oci->frame_type == KEY_FRAME),
                 oci->refresh_golden_frame,
                 oci->base_qindex,
                 oci->filter_level,
                 flags,
                 oci->mb_cols, oci->mb_rows);
         vp8_blit_text(message, oci->post_proc_buffer.y_buffer, oci->post_proc_buffer.y_stride);
     }
     if (flags & VP8D_DEBUG_TXT_MBLK_MODES)
     {
         int i, j;
         unsigned char *y_ptr;
         YV12_BUFFER_CONFIG *post = &oci->post_proc_buffer;
         int mb_rows = post->y_height >> 4;
         int mb_cols = post->y_width  >> 4;
         int mb_index = 0;
         MODE_INFO *mi = oci->mi;
         y_ptr = post->y_buffer + 4 * post->y_stride + 4;
         /* vp8_filter each macro block */
         for (i = 0; i < mb_rows; i++)
         {
             for (j = 0; j < mb_cols; j++)
             {
                 char zz[4];
                 sprintf(zz, "%c", mi[mb_index].mbmi.mode + 'a');
                 vp8_blit_text(zz, y_ptr, post->y_stride);
                 mb_index ++;
                 y_ptr += 16;
             }
             mb_index ++; /* border */
             y_ptr += post->y_stride  * 16 - post->y_width;
         }
     }
     if (flags & VP8D_DEBUG_TXT_DC_DIFF)
     {
         int i, j;
         unsigned char *y_ptr;
         YV12_BUFFER_CONFIG *post = &oci->post_proc_buffer;
         int mb_rows = post->y_height >> 4;
         int mb_cols = post->y_width  >> 4;
         int mb_index = 0;
         MODE_INFO *mi = oci->mi;
         y_ptr = post->y_buffer + 4 * post->y_stride + 4;
         /* vp8_filter each macro block */
         for (i = 0; i < mb_rows; i++)
         {
             for (j = 0; j < mb_cols; j++)
             {
                 char zz[4];
                 int dc_diff = !(mi[mb_index].mbmi.mode != B_PRED &&
                               mi[mb_index].mbmi.mode != SPLITMV &&
                               mi[mb_index].mbmi.mb_skip_coeff);
                 if (oci->frame_type == KEY_FRAME)
                     sprintf(zz, "a");
                 else
                     sprintf(zz, "%c", dc_diff + '0');
                 vp8_blit_text(zz, y_ptr, post->y_stride);
                 mb_index ++;
                 y_ptr += 16;
             }
             mb_index ++; /* border */
             y_ptr += post->y_stride  * 16 - post->y_width;
         }
     }
     if (flags & VP8D_DEBUG_TXT_RATE_INFO)
     {
         char message[512];
         sprintf(message, "Bitrate: %10.2f framerate: %10.2f ", oci->bitrate, oci->framerate);
         vp8_blit_text(message, oci->post_proc_buffer.y_buffer, oci->post_proc_buffer.y_stride);
     }
     /* Draw motion vectors */
     if ((flags & VP8D_DEBUG_DRAW_MV) && ppflags->display_mv_flag)
     {
         YV12_BUFFER_CONFIG *post = &oci->post_proc_buffer;
         int width  = post->y_width;
         int height = post->y_height;
         unsigned char *y_buffer = oci->post_proc_buffer.y_buffer;
         int y_stride = oci->post_proc_buffer.y_stride;
         MODE_INFO *mi = oci->mi;
         int x0, y0;
         for (y0 = 0; y0 < height; y0 += 16)
         {
             for (x0 = 0; x0 < width; x0 += 16)
             {
                 int x1, y1;
                 if (!(ppflags->display_mv_flag & (1<<mi->mbmi.mode)))
                 {
                     mi++;
                     continue;
                 }
                 if (mi->mbmi.mode == SPLITMV)
                 {
                     switch (mi->mbmi.partitioning)
                     {
                         case 0 :    /* mv_top_bottom */
                         {
                             union b_mode_info *bmi = &mi->bmi[0];
                             MV *mv = &bmi->mv.as_mv;
                             x1 = x0 + 8 + (mv->col >> 3);
                             y1 = y0 + 4 + (mv->row >> 3);
                             constrain_line (x0+8, &x1, y0+4, &y1, width, height);
                             vp8_blit_line  (x0+8,  x1, y0+4,  y1, y_buffer, y_stride);
                             bmi = &mi->bmi[8];
                             x1 = x0 + 8 + (mv->col >> 3);
                             y1 = y0 +12 + (mv->row >> 3);
                             constrain_line (x0+8, &x1, y0+12, &y1, width, height);
                             vp8_blit_line  (x0+8,  x1, y0+12,  y1, y_buffer, y_stride);
                             break;
                         }
                         case 1 :    /* mv_left_right */
                         {
                             union b_mode_info *bmi = &mi->bmi[0];
                             MV *mv = &bmi->mv.as_mv;
                             x1 = x0 + 4 + (mv->col >> 3);
                             y1 = y0 + 8 + (mv->row >> 3);
                             constrain_line (x0+4, &x1, y0+8, &y1, width, height);
                             vp8_blit_line  (x0+4,  x1, y0+8,  y1, y_buffer, y_stride);
                             bmi = &mi->bmi[2];
                             x1 = x0 +12 + (mv->col >> 3);
                             y1 = y0 + 8 + (mv->row >> 3);
                             constrain_line (x0+12, &x1, y0+8, &y1, width, height);
                             vp8_blit_line  (x0+12,  x1, y0+8,  y1, y_buffer, y_stride);
                             break;
                         }
                         case 2 :    /* mv_quarters   */
                         {
                             union b_mode_info *bmi = &mi->bmi[0];
                             MV *mv = &bmi->mv.as_mv;
                             x1 = x0 + 4 + (mv->col >> 3);
                             y1 = y0 + 4 + (mv->row >> 3);
                             constrain_line (x0+4, &x1, y0+4, &y1, width, height);
                             vp8_blit_line  (x0+4,  x1, y0+4,  y1, y_buffer, y_stride);
                             bmi = &mi->bmi[2];
                             x1 = x0 +12 + (mv->col >> 3);
                             y1 = y0 + 4 + (mv->row >> 3);
                             constrain_line (x0+12, &x1, y0+4, &y1, width, height);
                             vp8_blit_line  (x0+12,  x1, y0+4,  y1, y_buffer, y_stride);
                             bmi = &mi->bmi[8];
                             x1 = x0 + 4 + (mv->col >> 3);
                             y1 = y0 +12 + (mv->row >> 3);
                             constrain_line (x0+4, &x1, y0+12, &y1, width, height);
                             vp8_blit_line  (x0+4,  x1, y0+12,  y1, y_buffer, y_stride);
                             bmi = &mi->bmi[10];
                             x1 = x0 +12 + (mv->col >> 3);
                             y1 = y0 +12 + (mv->row >> 3);
                             constrain_line (x0+12, &x1, y0+12, &y1, width, height);
                             vp8_blit_line  (x0+12,  x1, y0+12,  y1, y_buffer, y_stride);
                             break;
                         }
                         default :
                         {
                             union b_mode_info *bmi = mi->bmi;
                             int bx0, by0;
                             for (by0 = y0; by0 < (y0+16); by0 += 4)
                             {
                                 for (bx0 = x0; bx0 < (x0+16); bx0 += 4)
                                 {
                                     MV *mv = &bmi->mv.as_mv;
                                     x1 = bx0 + 2 + (mv->col >> 3);
                                     y1 = by0 + 2 + (mv->row >> 3);
                                     constrain_line (bx0+2, &x1, by0+2, &y1, width, height);
                                     vp8_blit_line  (bx0+2,  x1, by0+2,  y1, y_buffer, y_stride);
                                     bmi++;
                                 }
                             }
                         }
                     }
                 }
                 else if (mi->mbmi.mode >= NEARESTMV)
                 {
                     MV *mv = &mi->mbmi.mv.as_mv;
                     const int lx0 = x0 + 8;
                     const int ly0 = y0 + 8;
                     x1 = lx0 + (mv->col >> 3);
                     y1 = ly0 + (mv->row >> 3);
                     if (x1 != lx0 && y1 != ly0)
                     {
                         constrain_line (lx0, &x1, ly0-1, &y1, width, height);
                         vp8_blit_line  (lx0,  x1, ly0-1,  y1, y_buffer, y_stride);
                         constrain_line (lx0, &x1, ly0+1, &y1, width, height);
                         vp8_blit_line  (lx0,  x1, ly0+1,  y1, y_buffer, y_stride);
                     }
                     else
                         vp8_blit_line  (lx0,  x1, ly0,  y1, y_buffer, y_stride);
                 }
                 mi++;
             }
             mi++;
         }
     }
     /* Color in block modes */
     if ((flags & VP8D_DEBUG_CLR_BLK_MODES)
         && (ppflags->display_mb_modes_flag || ppflags->display_b_modes_flag))
     {
         int y, x;
         YV12_BUFFER_CONFIG *post = &oci->post_proc_buffer;
         int width  = post->y_width;
         int height = post->y_height;
         unsigned char *y_ptr = oci->post_proc_buffer.y_buffer;
         unsigned char *u_ptr = oci->post_proc_buffer.u_buffer;
         unsigned char *v_ptr = oci->post_proc_buffer.v_buffer;
         int y_stride = oci->post_proc_buffer.y_stride;
         MODE_INFO *mi = oci->mi;
         for (y = 0; y < height; y += 16)
         {
             for (x = 0; x < width; x += 16)
             {
                 int Y = 0, U = 0, V = 0;
                 if (mi->mbmi.mode == B_PRED &&
                     ((ppflags->display_mb_modes_flag & B_PRED) || ppflags->display_b_modes_flag))
                 {
                     int by, bx;
                     unsigned char *yl, *ul, *vl;
                     union b_mode_info *bmi = mi->bmi;
                     yl = y_ptr + x;
                     ul = u_ptr + (x>>1);
                     vl = v_ptr + (x>>1);
                     for (by = 0; by < 16; by += 4)
                     {
                         for (bx = 0; bx < 16; bx += 4)
                         {
                             if ((ppflags->display_b_modes_flag & (1<<mi->mbmi.mode))
                                 || (ppflags->display_mb_modes_flag & B_PRED))
                             {
                                 Y = B_PREDICTION_MODE_colors[bmi->as_mode][0];
                                 U = B_PREDICTION_MODE_colors[bmi->as_mode][1];
                                 V = B_PREDICTION_MODE_colors[bmi->as_mode][2];
                                 vp8_blend_b
                                     (yl+bx, ul+(bx>>1), vl+(bx>>1), Y, U, V, 0xc000, y_stride);
                             }
                             bmi++;
                         }
                         yl += y_stride*4;
                         ul += y_stride*1;
                         vl += y_stride*1;
                     }
                 }
                 else if (ppflags->display_mb_modes_flag & (1<<mi->mbmi.mode))
                 {
                     Y = MB_PREDICTION_MODE_colors[mi->mbmi.mode][0];
                     U = MB_PREDICTION_MODE_colors[mi->mbmi.mode][1];
                     V = MB_PREDICTION_MODE_colors[mi->mbmi.mode][2];
                     vp8_blend_mb_inner
                         (y_ptr+x, u_ptr+(x>>1), v_ptr+(x>>1), Y, U, V, 0xc000, y_stride);
                 }
                 mi++;
             }
             y_ptr += y_stride*16;
             u_ptr += y_stride*4;
             v_ptr += y_stride*4;
             mi++;
         }
     }
     /* Color in frame reference blocks */
     if ((flags & VP8D_DEBUG_CLR_FRM_REF_BLKS) && ppflags->display_ref_frame_flag)
     {
         int y, x;
         YV12_BUFFER_CONFIG *post = &oci->post_proc_buffer;
         int width  = post->y_width;
         int height = post->y_height;
         unsigned char *y_ptr = oci->post_proc_buffer.y_buffer;
         unsigned char *u_ptr = oci->post_proc_buffer.u_buffer;
         unsigned char *v_ptr = oci->post_proc_buffer.v_buffer;
         int y_stride = oci->post_proc_buffer.y_stride;
         MODE_INFO *mi = oci->mi;
         for (y = 0; y < height; y += 16)
         {
             for (x = 0; x < width; x +=16)
             {
                 int Y = 0, U = 0, V = 0;
                 if (ppflags->display_ref_frame_flag & (1<<mi->mbmi.ref_frame))
                 {
                     Y = MV_REFERENCE_FRAME_colors[mi->mbmi.ref_frame][0];
                     U = MV_REFERENCE_FRAME_colors[mi->mbmi.ref_frame][1];
                     V = MV_REFERENCE_FRAME_colors[mi->mbmi.ref_frame][2];
                     vp8_blend_mb_outer
                         (y_ptr+x, u_ptr+(x>>1), v_ptr+(x>>1), Y, U, V, 0xc000, y_stride);
                 }
                 mi++;
             }
             y_ptr += y_stride*16;
             u_ptr += y_stride*4;
             v_ptr += y_stride*4;
             mi++;
         }
     }
 #endif
     *dest = oci->post_proc_buffer;
     /* handle problem with extending borders */
     dest->y_width = oci->Width;
     dest->y_height = oci->Height;
     dest->uv_height = dest->y_height / 2;
     return 0;
 }
 #endif

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

media/libvpx/vp8/common/postproc.c