Fix an issue in vp9_first_pass for non-mulitple of 16 resolutions

This patch sets the 16x16 src_diff to zero and ensures correct calculation
of this_error for block sizes smaller than 16x16.

Change-Id: I7b7c02d267433c9f22c8ac9b8d5df2f499175172

diff --git a/vp9/encoder/vp9_firstpass.c b/vp9/encoder/vp9_firstpass.c
index 1c716a10289c88dfb89ec8b72bd4683724e9a7ff..272dde593d74674f85c76066b81c85d335712e22 100644 (file)
--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -843,6 +843,10 @@ void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
       xd->mi[0]->mode = DC_PRED;
       xd->mi[0]->tx_size =
           use_dc_pred ? (bsize >= BLOCK_16X16 ? TX_16X16 : TX_8X8) : TX_4X4;
+
+      // Set the 16x16 src_diff block to zero, which ensures correct this_error
+      // calculation for block sizes smaller than 16x16.
+      vp9_zero_array(x->plane[0].src_diff, 256);
       vp9_encode_intra_block_plane(x, bsize, 0, 0);
       this_error = vpx_get_mb_ss(x->plane[0].src_diff);
       this_intra_error = this_error;