commit f533400a2d7e076ff94586eaecc6f53a319edf7b
author Luc Trudeau <ltrudeau@mozilla.com> Tue Apr 25 12:21:26 2017 -0400
committer Luc Trudeau <luc.trudeau@gmail.com> Fri May 05 15:58:34 2017 +0000
tree c33efb2b7d7c9be10099f51378393fdf0dd2da8a
parent 6d72a2f7a40a3348b841743f0618a9cf01f808c9

[CFL] Alpha signaling

Writes and reads alpha to and from the bitstream.

A special case is needed on the encoder side to handle prediction block
skips. Since whether or not a prediction block is skipped during CfL, a
rollback is required if the block was skipped and the alpha index was
not zero. The advantage of this is that no signaling is required when
the prediction block is skipped as it is assumed tha the alpha index is
zero.

A encode facade is added to the intra prediction facade as CfL requires
special encoder side operations.

Change-Id: Ic3b11d0fdbd51389d862112eb09d8785127a6b06

av1/encoder/rdopt.c

diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 737d9cd..bce9bc2 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -1533,7 +1533,12 @@
   if (args->exit_early) return;
 
   if (!is_inter_block(mbmi)) {
+#if CONFIG_CFL
+    av1_predict_intra_block_encoder_facade(xd, plane, block, blk_col, blk_row,
+                                           tx_size);
+#else
     av1_predict_intra_block_facade(xd, plane, block, blk_col, blk_row, tx_size);
+#endif
     av1_subtract_txb(x, plane, plane_bsize, blk_col, blk_row, tx_size);
   }
 
@@ -2343,7 +2348,11 @@
   int block = 0;
   for (row = 0; row < max_blocks_high; row += stepr) {
     for (col = 0; col < max_blocks_wide; col += stepc) {
+#if CONFIG_CFL
+      av1_predict_intra_block_encoder_facade(xd, 0, block, col, row, tx_size);
+#else
       av1_predict_intra_block_facade(xd, 0, block, col, row, tx_size);
+#endif
       block += step;
     }
   }