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vp9 non-rd partition: Update condition on force_split for skin area.

Avoid low resolutions for now.

Change-Id: Ib3a7bb8716a033449b2afb216edd70897a280df9

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -773,12 +773,13 @@

     vp9_build_inter_predictors_sb(xd, mi_row, mi_col, BLOCK_64X64);

     // Check if most of the superblock is skin content, and if so, force split

-    // to 32x32. Avoid checking superblocks on/near boundary for high resoln

+    // to 32x32. Avoid checking superblocks on/near boundary and avoid low

+    // resolutons for now.

     // Note superblock may still pick 64X64 if y_sad is very small

     // (i.e., y_sad < cpi->vbp_threshold_sad) below. For now leave this as is.

     x->sb_is_skin = 0;

 #if !CONFIG_VP9_HIGHBITDEPTH

-    if (cpi->oxcf.content != VP9E_CONTENT_SCREEN && (low_res || (mi_col >= 8 &&

+    if (cpi->oxcf.content != VP9E_CONTENT_SCREEN && (!low_res && (mi_col >= 8 &&

         mi_col + 8 < cm->mi_cols && mi_row >= 8 && mi_row + 8 < cm->mi_rows))) {

       int num_16x16_skin = 0;

       int num_16x16_nonskin = 0;