libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_segmentation.c

Index: source/libvpx/vp9/encoder/vp9_segmentation.c
===================================================================
--- source/libvpx/vp9/encoder/vp9_segmentation.c	(revision 271012)
+++ source/libvpx/vp9/encoder/vp9_segmentation.c	(working copy)
@@ -109,7 +109,7 @@
 }
 
 static void count_segs(VP9_COMP *cpi, const TileInfo *const tile,
-                       MODE_INFO **mi_8x8,
+                       MODE_INFO **mi,
                        int *no_pred_segcounts,
                        int (*temporal_predictor_count)[2],
                        int *t_unpred_seg_counts,
@@ -121,7 +121,7 @@
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
     return;
 
-  xd->mi = mi_8x8;
+  xd->mi = mi;
   segment_id = xd->mi[0]->mbmi.segment_id;
 
   set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw, cm->mi_rows, cm->mi_cols);
@@ -131,7 +131,7 @@
 
   // Temporal prediction not allowed on key frames
   if (cm->frame_type != KEY_FRAME) {
-    const BLOCK_SIZE bsize = mi_8x8[0]->mbmi.sb_type;
+    const BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
     // Test to see if the segment id matches the predicted value.
     const int pred_segment_id = vp9_get_segment_id(cm, cm->last_frame_seg_map,
                                                    bsize, mi_row, mi_col);
@@ -143,14 +143,14 @@
     xd->mi[0]->mbmi.seg_id_predicted = pred_flag;
     temporal_predictor_count[pred_context][pred_flag]++;
 
+    // Update the "unpredicted" segment count
     if (!pred_flag)
-      // Update the "unpredicted" segment count
       t_unpred_seg_counts[segment_id]++;
   }
 }
 
 static void count_segs_sb(VP9_COMP *cpi, const TileInfo *const tile,
-                          MODE_INFO **mi_8x8,
+                          MODE_INFO **mi,
                           int *no_pred_segcounts,
                           int (*temporal_predictor_count)[2],
                           int *t_unpred_seg_counts,
@@ -164,22 +164,22 @@
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
     return;
 
-  bw = num_8x8_blocks_wide_lookup[mi_8x8[0]->mbmi.sb_type];
-  bh = num_8x8_blocks_high_lookup[mi_8x8[0]->mbmi.sb_type];
+  bw = num_8x8_blocks_wide_lookup[mi[0]->mbmi.sb_type];
+  bh = num_8x8_blocks_high_lookup[mi[0]->mbmi.sb_type];
 
   if (bw == bs && bh == bs) {
-    count_segs(cpi, tile, mi_8x8, no_pred_segcounts, temporal_predictor_count,
+    count_segs(cpi, tile, mi, no_pred_segcounts, temporal_predictor_count,
                t_unpred_seg_counts, bs, bs, mi_row, mi_col);
   } else if (bw == bs && bh < bs) {
-    count_segs(cpi, tile, mi_8x8, no_pred_segcounts, temporal_predictor_count,
+    count_segs(cpi, tile, mi, no_pred_segcounts, temporal_predictor_count,
                t_unpred_seg_counts, bs, hbs, mi_row, mi_col);
-    count_segs(cpi, tile, mi_8x8 + hbs * mis, no_pred_segcounts,
+    count_segs(cpi, tile, mi + hbs * mis, no_pred_segcounts,
                temporal_predictor_count, t_unpred_seg_counts, bs, hbs,
                mi_row + hbs, mi_col);
   } else if (bw < bs && bh == bs) {
-    count_segs(cpi, tile, mi_8x8, no_pred_segcounts, temporal_predictor_count,
+    count_segs(cpi, tile, mi, no_pred_segcounts, temporal_predictor_count,
                t_unpred_seg_counts, hbs, bs, mi_row, mi_col);
-    count_segs(cpi, tile, mi_8x8 + hbs,
+    count_segs(cpi, tile, mi + hbs,
                no_pred_segcounts, temporal_predictor_count, t_unpred_seg_counts,
                hbs, bs, mi_row, mi_col + hbs);
   } else {
@@ -192,7 +192,7 @@
       const int mi_dc = hbs * (n & 1);
       const int mi_dr = hbs * (n >> 1);
 
-      count_segs_sb(cpi, tile, &mi_8x8[mi_dr * mis + mi_dc],
+      count_segs_sb(cpi, tile, &mi[mi_dr * mis + mi_dc],
                     no_pred_segcounts, temporal_predictor_count,
                     t_unpred_seg_counts,
                     mi_row + mi_dr, mi_col + mi_dc, subsize);
@@ -217,9 +217,6 @@
   vp9_prob t_pred_tree[SEG_TREE_PROBS];
   vp9_prob t_nopred_prob[PREDICTION_PROBS];
 
-  const int mis = cm->mi_stride;
-  MODE_INFO **mi_ptr, **mi;
-
   // Set default state for the segment tree probabilities and the
   // temporal coding probabilities
   vpx_memset(seg->tree_probs, 255, sizeof(seg->tree_probs));
@@ -229,12 +226,13 @@
   // predicts this one
   for (tile_col = 0; tile_col < 1 << cm->log2_tile_cols; tile_col++) {
     TileInfo tile;
-
+    MODE_INFO **mi_ptr;
     vp9_tile_init(&tile, cm, 0, tile_col);
+
     mi_ptr = cm->mi_grid_visible + tile.mi_col_start;
     for (mi_row = 0; mi_row < cm->mi_rows;
-         mi_row += 8, mi_ptr += 8 * mis) {
-      mi = mi_ptr;
+         mi_row += 8, mi_ptr += 8 * cm->mi_stride) {
+      MODE_INFO **mi = mi_ptr;
       for (mi_col = tile.mi_col_start; mi_col < tile.mi_col_end;
            mi_col += 8, mi += 8)
         count_segs_sb(cpi, &tile, mi, no_pred_segcounts,