Remove deprecated use_lastframe_partitioning feature

This speed feature has been deprecated in both yt and rtc coding
modes. This commit removes the related operations.

Change-Id: I079c79c6adafe45581af2ebf8b98faebcface1ce

vp9/encoder/vp9_encodeframe.c

@@ -2554,10 +2554,6 @@ static void encode_rd_sb_row(VP9_COMP *cpi, const TileInfo *const tile,
 
     const int idx_str = cm->mi_stride * mi_row + mi_col;
     MODE_INFO *mi = cm->mi + idx_str;
-    MODE_INFO *prev_mi = NULL;
-
-    if (cm->frame_type != KEY_FRAME)
-      prev_mi = (cm->prev_mip + cm->mi_stride + 1 + idx_str)->src_mi;
 
     if (sf->adaptive_pred_interp_filter) {
       for (i = 0; i < 64; ++i)
@@ -2574,9 +2570,6 @@ static void encode_rd_sb_row(VP9_COMP *cpi, const TileInfo *const tile,
     vp9_zero(cpi->mb.pred_mv);
     cpi->pc_root->index = 0;
 
-    // TODO(yunqingwang): use_lastframe_partitioning is no longer used in good-
-    // quality encoding. Need to evaluate it in real-time encoding later to
-    // decide if it can be removed too. And then, do the code cleanup.
     cpi->mb.source_variance = UINT_MAX;
     if (sf->partition_search_type == FIXED_PARTITION) {
       set_offsets(cpi, tile, mi_row, mi_col, BLOCK_64X64);
@@ -2596,25 +2589,6 @@ static void encode_rd_sb_row(VP9_COMP *cpi, const TileInfo *const tile,
       choose_partitioning(cpi, tile, mi_row, mi_col);
       rd_use_partition(cpi, tile, mi, tp, mi_row, mi_col, BLOCK_64X64,
                        &dummy_rate, &dummy_dist, 1, cpi->pc_root);
-    } else if (sf->partition_search_type == SEARCH_PARTITION &&
-               sf->use_lastframe_partitioning &&
-               (cpi->rc.frames_since_key %
-                   sf->last_partitioning_redo_frequency) &&
-               cm->prev_mi &&
-               cm->show_frame &&
-               cm->frame_type != KEY_FRAME &&
-               !cpi->rc.is_src_frame_alt_ref &&
-               ((sf->use_lastframe_partitioning !=
-                   LAST_FRAME_PARTITION_LOW_MOTION) ||
-                   !sb_has_motion(cm, prev_mi, sf->lf_motion_threshold))) {
-      if (sf->constrain_copy_partition &&
-          sb_has_motion(cm, prev_mi, sf->lf_motion_threshold))
-        constrain_copy_partitioning(cpi, tile, mi, prev_mi,
-                                    mi_row, mi_col, BLOCK_16X16);
-      else
-        copy_partitioning(cm, mi, prev_mi);
-      rd_use_partition(cpi, tile, mi, tp, mi_row, mi_col, BLOCK_64X64,
-                       &dummy_rate, &dummy_dist, 1, cpi->pc_root);
     } else {
       // If required set upper and lower partition size limits
       if (sf->auto_min_max_partition_size) {

vp9/encoder/vp9_speed_features.c

@@ -205,7 +205,6 @@ static void set_rt_speed_feature(VP9_COMP *cpi, SPEED_FEATURES *sf,
     sf->disable_filter_search_var_thresh = 50;
     sf->comp_inter_joint_search_thresh = BLOCK_SIZES;
     sf->auto_min_max_partition_size = RELAXED_NEIGHBORING_MIN_MAX;
-    sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_LOW_MOTION;
     sf->lf_motion_threshold = LOW_MOTION_THRESHOLD;
     sf->adjust_partitioning_from_last_frame = 1;
     sf->last_partitioning_redo_frequency = 3;
@@ -217,7 +216,6 @@ static void set_rt_speed_feature(VP9_COMP *cpi, SPEED_FEATURES *sf,
   if (speed >= 3) {
     sf->use_square_partition_only = 1;
     sf->disable_filter_search_var_thresh = 100;
-    sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_ALL;
     sf->constrain_copy_partition = 1;
     sf->use_uv_intra_rd_estimate = 1;
     sf->skip_encode_sb = 1;
@@ -348,7 +346,6 @@ void vp9_set_speed_features(VP9_COMP *cpi) {
   sf->mv.fullpel_search_step_param = 6;
   sf->comp_inter_joint_search_thresh = BLOCK_4X4;
   sf->adaptive_rd_thresh = 0;
-  sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_OFF;
   sf->tx_size_search_method = USE_FULL_RD;
   sf->use_lp32x32fdct = 0;
   sf->adaptive_motion_search = 0;

vp9/encoder/vp9_speed_features.h

@@ -92,12 +92,6 @@ typedef enum {
   LOW_MOTION_THRESHOLD = 7
 } MOTION_THRESHOLD;
 
-typedef enum {
-  LAST_FRAME_PARTITION_OFF = 0,
-  LAST_FRAME_PARTITION_LOW_MOTION = 1,
-  LAST_FRAME_PARTITION_ALL = 2
-} LAST_FRAME_PARTITION_METHOD;
-
 typedef enum {
   USE_FULL_RD = 0,
   USE_LARGESTALL,
@@ -242,15 +236,6 @@ typedef struct SPEED_FEATURES {
   // level within a frame.
   int allow_skip_recode;
 
-  // This variable allows us to reuse the last frames partition choices
-  // (64x64 v 32x32 etc) for this frame. It can be set to only use the last
-  // frame as a starting point in low motion scenes or always use it. If set
-  // we use last partitioning_redo frequency to determine how often to redo
-  // the partitioning from scratch. Adjust_partitioning_from_last_frame
-  // enables us to adjust up or down one partitioning from the last frames
-  // partitioning.
-  LAST_FRAME_PARTITION_METHOD use_lastframe_partitioning;
-
   // The threshold is to determine how slow the motino is, it is used when
   // use_lastframe_partitioning is set to LAST_FRAME_PARTITION_LOW_MOTION
   MOTION_THRESHOLD lf_motion_threshold;
@@ -264,8 +249,6 @@ typedef struct SPEED_FEATURES {
   // precise but significantly faster than the non lp version.
   int use_lp32x32fdct;
 
-  // TODO(JBB): remove this as its no longer used.
-
   // After looking at the first set of modes (set by index here), skip
   // checking modes for reference frames that don't match the reference frame
   // of the best so far.