func: static av_always_inline void FUNC(intra_pred)(HEVCContext *s, int x0, int y0,
  
                                                int log2_size, int c_idx)
  
  {
  
  #define PU(x) \
  
      ((x) >> s->ps.sps->log2_min_pu_size)
  
  #define MVF(x, y) \
  
      (s->ref->tab_mvf[(x) + (y) * min_pu_width])
  
  #define MVF_PU(x, y) \
  
      MVF(PU(x0 + ((x) << hshift)), PU(y0 + ((y) << vshift)))
  
  #define IS_INTRA(x, y) \
  
      (MVF_PU(x, y).pred_flag == PF_INTRA)
  
  #define MIN_TB_ADDR_ZS(x, y) \
  
      s->ps.pps->min_tb_addr_zs[(y) * (s->ps.sps->tb_mask+2) + (x)]
  
  #define EXTEND(ptr, val, len)         \
  
  do {                                  \
  
      pixel4 pix = PIXEL_SPLAT_X4(val); \
  
      for (i = 0; i < (len); i += 4)    \
  
          AV_WN4P(ptr + i, pix);        \
  
  } while (0)
  
  
  
  #define EXTEND_RIGHT_CIP(ptr, start, length)                                   \
  
          for (i = start; i < (start) + (length); i += 4)                        \
  
              if (!IS_INTRA(i, -1))                                              \
  
                  AV_WN4P(&ptr[i], a);                                           \
  
              else                                                               \
  
                  a = PIXEL_SPLAT_X4(ptr[i+3])
  
  #define EXTEND_LEFT_CIP(ptr, start, length) \
  
          for (i = start; i > (start) - (length); i--) \
  
              if (!IS_INTRA(i - 1, -1)) \
  
                  ptr[i - 1] = ptr[i]
  
  #define EXTEND_UP_CIP(ptr, start, length)                                      \
  
          for (i = (start); i > (start) - (length); i -= 4)                      \
  
              if (!IS_INTRA(-1, i - 3))                                          \
  
                  AV_WN4P(&ptr[i - 3], a);                                       \
  
              else                                                               \
  
                  a = PIXEL_SPLAT_X4(ptr[i - 3])
  
  #define EXTEND_DOWN_CIP(ptr, start, length)                                    \
  
          for (i = start; i < (start) + (length); i += 4)                        \
  
              if (!IS_INTRA(-1, i))                                              \
  
                  AV_WN4P(&ptr[i], a);                                           \
  
              else                                                               \
  
                  a = PIXEL_SPLAT_X4(ptr[i + 3])
  
  
  
      HEVCLocalContext *lc = s->HEVClc;
  
      int i;
  
      int hshift = s->ps.sps->hshift[c_idx];
  
      int vshift = s->ps.sps->vshift[c_idx];
  
      int size = (1 << log2_size);
  
      int size_in_luma_h = size << hshift;
  
      int size_in_tbs_h  = size_in_luma_h >> s->ps.sps->log2_min_tb_size;
  
      int size_in_luma_v = size << vshift;
  
      int size_in_tbs_v  = size_in_luma_v >> s->ps.sps->log2_min_tb_size;
  
      int x = x0 >> hshift;
  
      int y = y0 >> vshift;
  
      int x_tb = (x0 >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask;
  
      int y_tb = (y0 >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask;
  
  
  
      int cur_tb_addr = MIN_TB_ADDR_ZS(x_tb, y_tb);
  
  
  
      ptrdiff_t stride = s->frame->linesize[c_idx] / sizeof(pixel);
  
      pixel *src = (pixel*)s->frame->data[c_idx] + x + y * stride;
  
  
  
      int min_pu_width = s->ps.sps->min_pu_width;
  
  
  
      enum IntraPredMode mode = c_idx ? lc->tu.intra_pred_mode_c :
  
                                lc->tu.intra_pred_mode;
  
      pixel4 a;
  
      pixel  left_array[2 * MAX_TB_SIZE + 1];
  
      pixel  filtered_left_array[2 * MAX_TB_SIZE + 1];
  
      pixel  top_array[2 * MAX_TB_SIZE + 1];
  
      pixel  filtered_top_array[2 * MAX_TB_SIZE + 1];
  
  
  
      pixel  *left          = left_array + 1;
  
      pixel  *top           = top_array  + 1;
  
      pixel  *filtered_left = filtered_left_array + 1;
  
      pixel  *filtered_top  = filtered_top_array  + 1;
  
      int cand_bottom_left = lc->na.cand_bottom_left && cur_tb_addr > MIN_TB_ADDR_ZS( x_tb - 1, (y_tb + size_in_tbs_v) & s->ps.sps->tb_mask);
  
      int cand_left        = lc->na.cand_left;
  
      int cand_up_left     = lc->na.cand_up_left;
  
      int cand_up          = lc->na.cand_up;
  
      int cand_up_right    = lc->na.cand_up_right    && cur_tb_addr > MIN_TB_ADDR_ZS((x_tb + size_in_tbs_h) & s->ps.sps->tb_mask, y_tb - 1);
  
  
  
      int bottom_left_size = (FFMIN(y0 + 2 * size_in_luma_v, s->ps.sps->height) -
  
                             (y0 + size_in_luma_v)) >> vshift;
  
      int top_right_size   = (FFMIN(x0 + 2 * size_in_luma_h, s->ps.sps->width) -
  
                             (x0 + size_in_luma_h)) >> hshift;
  
  
  
      if (s->ps.pps->constrained_intra_pred_flag == 1) {
  
          int size_in_luma_pu_v = PU(size_in_luma_v);
  
          int size_in_luma_pu_h = PU(size_in_luma_h);
  
          int on_pu_edge_x    = !av_mod_uintp2(x0, s->ps.sps->log2_min_pu_size);
  
          int on_pu_edge_y    = !av_mod_uintp2(y0, s->ps.sps->log2_min_pu_size);
  
          if (!size_in_luma_pu_h)
  
              size_in_luma_pu_h++;
  
          if (cand_bottom_left == 1 && on_pu_edge_x) {
  
              int x_left_pu   = PU(x0 - 1);
  
              int y_bottom_pu = PU(y0 + size_in_luma_v);
  
              int max = FFMIN(size_in_luma_pu_v, s->ps.sps->min_pu_height - y_bottom_pu);
  
              cand_bottom_left = 0;
  
              for (i = 0; i < max; i += 2)
  
                  cand_bottom_left |= (MVF(x_left_pu, y_bottom_pu + i).pred_flag == PF_INTRA);
  
          }
  
          if (cand_left == 1 && on_pu_edge_x) {
  
              int x_left_pu   = PU(x0 - 1);
  
              int y_left_pu   = PU(y0);
  
              int max = FFMIN(size_in_luma_pu_v, s->ps.sps->min_pu_height - y_left_pu);
  
              cand_left = 0;
  
              for (i = 0; i < max; i += 2)
  
                  cand_left |= (MVF(x_left_pu, y_left_pu + i).pred_flag == PF_INTRA);
  
          }
  
          if (cand_up_left == 1) {
  
              int x_left_pu   = PU(x0 - 1);
  
              int y_top_pu    = PU(y0 - 1);
  
              cand_up_left = MVF(x_left_pu, y_top_pu).pred_flag == PF_INTRA;
  
          }
  
          if (cand_up == 1 && on_pu_edge_y) {
  
              int x_top_pu    = PU(x0);
  
              int y_top_pu    = PU(y0 - 1);
  
              int max = FFMIN(size_in_luma_pu_h, s->ps.sps->min_pu_width - x_top_pu);
  
              cand_up = 0;
  
              for (i = 0; i < max; i += 2)
  
                  cand_up |= (MVF(x_top_pu + i, y_top_pu).pred_flag == PF_INTRA);
  
          }
  
          if (cand_up_right == 1 && on_pu_edge_y) {
  
              int y_top_pu    = PU(y0 - 1);
  
              int x_right_pu  = PU(x0 + size_in_luma_h);
  
              int max = FFMIN(size_in_luma_pu_h, s->ps.sps->min_pu_width - x_right_pu);
  
              cand_up_right = 0;
  
              for (i = 0; i < max; i += 2)
  
                  cand_up_right |= (MVF(x_right_pu + i, y_top_pu).pred_flag == PF_INTRA);
  
          }
  
          memset(left, 128, 2 * MAX_TB_SIZE*sizeof(pixel));
  
          memset(top , 128, 2 * MAX_TB_SIZE*sizeof(pixel));
  
          top[-1] = 128;
  
      }
  
      if (cand_up_left) {
  
          left[-1] = POS(-1, -1);
  
          top[-1]  = left[-1];
  
      }
  
      if (cand_up)
  
          memcpy(top, src - stride, size * sizeof(pixel));
  
      if (cand_up_right) {
  
          memcpy(top + size, src - stride + size, size * sizeof(pixel));
  
          EXTEND(top + size + top_right_size, POS(size + top_right_size - 1, -1),
  
                 size - top_right_size);
  
      }
  
      if (cand_left)
  
          for (i = 0; i < size; i++)
  
              left[i] = POS(-1, i);
  
      if (cand_bottom_left) {
  
          for (i = size; i < size + bottom_left_size; i++)
  
              left[i] = POS(-1, i);
  
          EXTEND(left + size + bottom_left_size, POS(-1, size + bottom_left_size - 1),
  
                 size - bottom_left_size);
  
      }
  
  
  
      if (s->ps.pps->constrained_intra_pred_flag == 1) {
  
          if (cand_bottom_left || cand_left || cand_up_left || cand_up || cand_up_right) {
  
              int size_max_x = x0 + ((2 * size) << hshift) < s->ps.sps->width ?
  
                                      2 * size : (s->ps.sps->width - x0) >> hshift;
  
              int size_max_y = y0 + ((2 * size) << vshift) < s->ps.sps->height ?
  
                                      2 * size : (s->ps.sps->height - y0) >> vshift;
  
              int j = size + (cand_bottom_left? bottom_left_size: 0) -1;
  
              if (!cand_up_right) {
  
                  size_max_x = x0 + ((size) << hshift) < s->ps.sps->width ?
  
                                                      size : (s->ps.sps->width - x0) >> hshift;
  
              }
  
              if (!cand_bottom_left) {
  
                  size_max_y = y0 + (( size) << vshift) < s->ps.sps->height ?
  
                                                       size : (s->ps.sps->height - y0) >> vshift;
  
              }
  
              if (cand_bottom_left || cand_left || cand_up_left) {
  
                  while (j > -1 && !IS_INTRA(-1, j))
  
                      j--;
  
                  if (!IS_INTRA(-1, j)) {
  
                      j = 0;
  
                      while (j < size_max_x && !IS_INTRA(j, -1))
  
                          j++;
  
                      EXTEND_LEFT_CIP(top, j, j + 1);
  
                      left[-1] = top[-1];
  
                  }
  
              } else {
  
                  j = 0;
  
                  while (j < size_max_x && !IS_INTRA(j, -1))
  
                      j++;
  
                  if (j > 0)
  
                      if (x0 > 0) {
  
                          EXTEND_LEFT_CIP(top, j, j + 1);
  
                      } else {
  
                          EXTEND_LEFT_CIP(top, j, j);
  
                          top[-1] = top[0];
  
                      }
  
                  left[-1] = top[-1];
  
              }
  
              left[-1] = top[-1];
  
              if (cand_bottom_left || cand_left) {
  
                  a = PIXEL_SPLAT_X4(left[-1]);
  
                  EXTEND_DOWN_CIP(left, 0, size_max_y);
  
              }
  
              if (!cand_left)
  
                  EXTEND(left, left[-1], size);
  
              if (!cand_bottom_left)
  
                  EXTEND(left + size, left[size - 1], size);
  
              if (x0 != 0 && y0 != 0) {
  
                  a = PIXEL_SPLAT_X4(left[size_max_y - 1]);
  
                  EXTEND_UP_CIP(left, size_max_y - 1, size_max_y);
  
                  if (!IS_INTRA(-1, - 1))
  
                      left[-1] = left[0];
  
              } else if (x0 == 0) {
  
                  EXTEND(left, 0, size_max_y);
  
              } else {
  
                  a = PIXEL_SPLAT_X4(left[size_max_y - 1]);
  
                  EXTEND_UP_CIP(left, size_max_y - 1, size_max_y);
  
              }
  
              top[-1] = left[-1];
  
              if (y0 != 0) {
  
                  a = PIXEL_SPLAT_X4(left[-1]);
  
                  EXTEND_RIGHT_CIP(top, 0, size_max_x);
  
              }
  
          }
  
      }
  
      // Infer the unavailable samples
  
      if (!cand_bottom_left) {
  
          if (cand_left) {
  
              EXTEND(left + size, left[size - 1], size);
  
          } else if (cand_up_left) {
  
              EXTEND(left, left[-1], 2 * size);
  
              cand_left = 1;
  
          } else if (cand_up) {
  
              left[-1] = top[0];
  
              EXTEND(left, left[-1], 2 * size);
  
              cand_up_left = 1;
  
              cand_left    = 1;
  
          } else if (cand_up_right) {
  
              EXTEND(top, top[size], size);
  
              left[-1] = top[size];
  
              EXTEND(left, left[-1], 2 * size);
  
              cand_up      = 1;
  
              cand_up_left = 1;
  
              cand_left    = 1;
  
          } else { // No samples available
  
              left[-1] = (1 << (BIT_DEPTH - 1));
  
              EXTEND(top,  left[-1], 2 * size);
  
              EXTEND(left, left[-1], 2 * size);
  
          }
  
      }
  
  
  
      if (!cand_left)
  
          EXTEND(left, left[size], size);
  
      if (!cand_up_left) {
  
          left[-1] = left[0];
  
      }
  
      if (!cand_up)
  
          EXTEND(top, left[-1], size);
  
      if (!cand_up_right)
  
          EXTEND(top + size, top[size - 1], size);
  
  
  
      top[-1] = left[-1];
  
  
  
      // Filtering process
  
      if (!s->ps.sps->intra_smoothing_disabled_flag && (c_idx == 0  || s->ps.sps->chroma_format_idc == 3)) {
  
          if (mode != INTRA_DC && size != 4){
  
              int intra_hor_ver_dist_thresh[] = { 7, 1, 0 };
  
              int min_dist_vert_hor = FFMIN(FFABS((int)(mode - 26U)),
  
                                            FFABS((int)(mode - 10U)));
  
              if (min_dist_vert_hor > intra_hor_ver_dist_thresh[log2_size - 3]) {
  
                  int threshold = 1 << (BIT_DEPTH - 5);
  
                  if (s->ps.sps->sps_strong_intra_smoothing_enable_flag && c_idx == 0 &&
  
                      log2_size == 5 &&
  
                      FFABS(top[-1]  + top[63]  - 2 * top[31])  < threshold &&
  
                      FFABS(left[-1] + left[63] - 2 * left[31]) < threshold) {
  
                      // We can't just overwrite values in top because it could be
  
                      // a pointer into src
  
                      filtered_top[-1] = top[-1];
  
                      filtered_top[63] = top[63];
  
                      for (i = 0; i < 63; i++)
  
                          filtered_top[i] = ((64 - (i + 1)) * top[-1] +
  
                                             (i + 1)  * top[63] + 32) >> 6;
  
                      for (i = 0; i < 63; i++)
  
                          left[i] = ((64 - (i + 1)) * left[-1] +
  
                                     (i + 1)  * left[63] + 32) >> 6;
  
                      top = filtered_top;
  
                  } else {
  
                      filtered_left[2 * size - 1] = left[2 * size - 1];
  
                      filtered_top[2 * size - 1]  = top[2 * size - 1];
  
                      for (i = 2 * size - 2; i >= 0; i--)
  
                          filtered_left[i] = (left[i + 1] + 2 * left[i] +
  
                                              left[i - 1] + 2) >> 2;
  
                      filtered_top[-1]  =
  
                      filtered_left[-1] = (left[0] + 2 * left[-1] + top[0] + 2) >> 2;
  
                      for (i = 2 * size - 2; i >= 0; i--)
  
                          filtered_top[i] = (top[i + 1] + 2 * top[i] +
  
                                             top[i - 1] + 2) >> 2;
  
                      left = filtered_left;
  
                      top  = filtered_top;
  
                  }
  
              }
  
          }
  
      }
  
  
  
      switch (mode) {
  
      case INTRA_PLANAR:
  
          s->hpc.pred_planar[log2_size - 2]((uint8_t *)src, (uint8_t *)top,
  
                                            (uint8_t *)left, stride);
  
          break;
  
      case INTRA_DC:
  
          s->hpc.pred_dc((uint8_t *)src, (uint8_t *)top,
  
                         (uint8_t *)left, stride, log2_size, c_idx);
  
          break;
  
      default:
  
          s->hpc.pred_angular[log2_size - 2]((uint8_t *)src, (uint8_t *)top,
  
                                             (uint8_t *)left, stride, c_idx,
  
                                             mode);
  
          break;
  
      }
  
  }
  