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Segment Features with 8x8DCT.

Temporary check in to turn off other segment features
tests when #if CONFIG_T8X8 is set as the assignment of
MBs to differnt segments in each case  will conflict.

The 8x8 code will be modified to use the new segment
feature method properly in a later check in.

Increase bits allowed for EOB end stop marker to 6 ready
for 8x8.

Change-Id: I4835bc8d3bf98e1775c3d247d778639c90b01f7f

--- a/vp8/common/blockd.h

+++ b/vp8/common/blockd.h

@@ -113,6 +113,16 @@

 } SEG_LVL_FEATURES;

+// Segment level features.

+typedef enum

+{

+    TX_4X4 = 0,                      // 4x4 dct transform

+    TX_8X8 = 1,                      // 8x8 dct transform

+

+    TX_SIZE_MAX = 2                  // Number of differnt transforms avaialble

+

+} TX_SIZE;

+

 #define VP8_YMODES  (B_PRED + 1)

 #define VP8_UV_MODES (TM_PRED + 1)

 #define VP8_I8X8_MODES (TM_PRED + 1)

--- a/vp8/common/seg_common.c

+++ b/vp8/common/seg_common.c

@@ -12,7 +12,7 @@

 //#if CONFIG_SEGFEATURES

 const int segfeaturedata_signed[SEG_LVL_MAX] = {1, 1, 0, 0, 0, 0};

-const int vp8_seg_feature_data_bits[SEG_LVL_MAX] = {7, 6, 4, 4, 4, 2};

+const int vp8_seg_feature_data_bits[SEG_LVL_MAX] = {7, 6, 4, 4, 6, 2};

 // These functions provide access to new segment level features.

 // Eventually these function may be "optimized out" but for the moment,

--- a/vp8/encoder/onyx_if.c

+++ b/vp8/encoder/onyx_if.c

@@ -481,6 +481,16 @@

                    (cpi->cq_target_quality > 16 ) ) ||

                  (cpi->ni_av_qi > 32);

+#if CONFIG_T8X8

+    // TODO

+    // For now 8x8TX mode just set segments up for 8x8 and 4x4 modes and exit.

+    //enable_segfeature(xd, 0, SEG_LVL_TRANSFORM);

+    //set_segdata( xd, 0, SEG_LVL_TRANSFORM, TX_4X4 );

+    //enable_segfeature(xd, 1, SEG_LVL_TRANSFORM);

+    //set_segdata( xd, 1, SEG_LVL_TRANSFORM, TX_8X8 );

+    return;

+#endif

+

     // For now at least dont enable seg features alongside cyclic refresh.

     if ( cpi->cyclic_refresh_mode_enabled ||

          (cpi->pass != 2) )