shithub: libvpx

Info  •  Files  •  Log  •  Branches

Avoid inverse transform/recon without residual

Avoid calling decode_block, inverse transform/add in the block is
a skip block for SBs smaller than 8x8 and intra-coded SBs.

Change-Id: I1684182f4a0050c8d6bb46cba6830d9425e7127d

--- a/vp9/decoder/vp9_decodframe.c

+++ b/vp9/decoder/vp9_decodframe.c

@@ -270,6 +270,10 @@

   vp9_predict_intra_block(xd, tx_ib, plane_b_size, tx_size,

                           b_mode, dst, xd->plane[plane].dst.stride);

+  // Early exit if there are no coefficients

+  if (xd->mode_info_context->mbmi.mb_skip_coeff)

+    return;

+

   switch (ss_txfrm_size / 2) {

     case TX_4X4:

       tx_type = plane == 0 ? get_tx_type_4x4(xd, raster_block) : DCT_DCT;

@@ -318,8 +322,9 @@

     if (!vp9_reader_has_error(r)) {

       vp9_decode_tokens(pbi, xd, r, bsize);

     }

+

+    foreach_transformed_block(xd, bsize, decode_block, xd);

   }

-  foreach_transformed_block(xd, bsize, decode_block, xd);

 }

 static void decode_sb_intra(VP9D_COMP *pbi, MACROBLOCKD *xd,