shithub: libvpx

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vp10: only assume ONLY_4X4 if segmentation is disabled.

Otherwise, per-segment lossless might mean that some segments are not
lossless and they could still want to use another mode. The per-block
tx points remain uncoded on blocks where (per the segment id) the Q
value implies lossless.

Change-Id: If210206ab1fe3dd11976797370c77f961f13dfa0

--- a/vp10/decoder/decodeframe.c

+++ b/vp10/decoder/decodeframe.c

@@ -2109,8 +2109,8 @@

   setup_segmentation_dequant(cm);

 #if CONFIG_MISC_FIXES

-  cm->tx_mode = (xd->lossless[0]) ? ONLY_4X4

-                                  : read_tx_mode(rb);

+  cm->tx_mode = (!cm->seg.enabled && xd->lossless[0]) ? ONLY_4X4

+                                                      : read_tx_mode(rb);

   cm->reference_mode = read_frame_reference_mode(cm, rb);

 #endif

--- a/vp10/encoder/bitstream.c

+++ b/vp10/encoder/bitstream.c

@@ -1261,7 +1261,7 @@

   encode_quantization(cm, wb);

   encode_segmentation(cm, xd, wb);

 #if CONFIG_MISC_FIXES

-  if (xd->lossless[0])

+  if (!cm->seg.enabled && xd->lossless[0])

     cm->tx_mode = TX_4X4;

   else

     write_txfm_mode(cm->tx_mode, wb);