Non-rd mode: Limit transform size for intra to 16x16.

Limit transform size for intra to 16x16, for non-screen content mode.
Little/no change in speed or metrics.
32x32 intra block is rarley selected in RTC (non-screen content) case,
but some visual improvement can be seen in some example,
e.g., captured_video_dark_whd.yuv.

Change-Id: I68e2db87875343b3fb9bb407a7709f0088f84072

diff --git a/vp9/encoder/vp9_pickmode.c b/vp9/encoder/vp9_pickmode.c
index 5a4b26a..fc4d9ae 100644 (file)
--- a/vp9/encoder/vp9_pickmode.c
+++ b/vp9/encoder/vp9_pickmode.c
@@ -1532,11 +1532,13 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
       (!x->skip && best_rdc.rdcost > inter_mode_thresh &&
        bsize <= cpi->sf.max_intra_bsize)) {
     struct estimate_block_intra_args args = { cpi, x, DC_PRED, 0, 0 };
-    const TX_SIZE intra_tx_size =
-        VPXMIN(max_txsize_lookup[bsize],
-               tx_mode_to_biggest_tx_size[cpi->common.tx_mode]);
     int i;
     TX_SIZE best_intra_tx_size = TX_SIZES;
+    TX_SIZE intra_tx_size =
+        VPXMIN(max_txsize_lookup[bsize],
+               tx_mode_to_biggest_tx_size[cpi->common.tx_mode]);
+    if (cpi->oxcf.content != VP9E_CONTENT_SCREEN && intra_tx_size > TX_16X16)
+      intra_tx_size = TX_16X16;
 
     if (reuse_inter_pred && best_pred != NULL) {
       if (best_pred->data == orig_dst.buf) {