shithub: libvpx

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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

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1532,11 +1532,13 @@

       (!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) {