Added encoding in Superblock Order

As a precursor to encoding 32x32 blocks this cl adds the
ability to encode the frame superblock (=32x32 block) at
a time. Within a SB the 4 indiviual MBs are encoded in
raster-order (NW,NE,SW,SE).

This functionality is added as an experiment which can be
enabled by ispecifying --enable-superblocks in the
command line specified to configure (CONFIG_SUPERBLOCKS
macro in the code).

To make this work I had to disable the two intra
prediction modes that use data from the top-right of the
MB.

On the tests that I have run the results produce
almost exactly the same PSNRs & SSIMs with a very
slightly higher average data rate (and slightly higher
data rate than just disabling the two intra modes in
the original code).

NOTE: This will also break the multi-threaded code.

This replaces the abandoned change:
Iebebe0d1a50ce8c15c79862c537b765a2f67e162

Change-Id: I1bc1a00f236abc1a373c7210d756e25f970fcad8

1 files changed, 2 insertions, 2 deletions

diff --git a/vp8/encoder/segmentation.c b/vp8/encoder/segmentation.c
index 1d2e98bd0..91dffe166 100644
--- a/vp8/encoder/segmentation.c
+++ b/vp8/encoder/segmentation.c
@@ -214,7 +214,7 @@ void choose_segmap_coding_method( VP8_COMP *cpi )
     // First of all generate stats regarding how well the last segment map
     // predicts this one
 
-    // Initialize macroblod decoder mode info context for to the first mb
+    // Initialize macroblock decoder mode info context for the first mb
     // in the frame
     xd->mode_info_context = cm->mi;
 
@@ -244,7 +244,7 @@ void choose_segmap_coding_method( VP8_COMP *cpi )
                 temporal_predictor_count[pred_context][seg_predicted]++;
 
                 if ( !seg_predicted )
-                    // Update the "undpredicted" segment count
+                    // Update the "unpredicted" segment count
                     t_unpred_seg_counts[segment_id]++;
             }