Use lookup table to replace the arithmetic computation for transform
block step.

Change-Id: I1318d81bda9d7ffaf9d550acd19354b0615ede36

This prepares the support to both rectangular and 2x2 transform
block sizes.

Change-Id: I3c2d4e317f6b627bb45d2273c278331bd976ee92

Allow the decoder to memset partial dequantized coefficient line
to zero.

Change-Id: I1f07dc7bf802958754502c1b5c819cc81e7a08cb

Cherry-pick Daala b5020bee:
 Remove redundant test in od_ec_decode_bool_q15().
Using a test that decodes 100M random binary symbols, making this change
 produced a speed up of 8.81% with gcc-4.9.3 and 3.71% with clang-3.7.1,
 both compiled with -O2.

Change-Id: If6d0077a56121a575ae53bcd4d1d9b7d800a317d

This CL will facilitate adapt_scan experiment.
In adapt_scan experiment, dynamic scan order will be stored in
AV1_COMMON

Change-Id: I4763ea931b5e1af54d4f173971befeb01a4db335

Change-Id: Icda975cd9b264c1752c3057bce8031791f91c08a

Use the table access to retrieve pixel numbers from tx_size.

Change-Id: I9459f2c3292c2f9ddf963f16b79e142de7432031

* changes:
  Palette: Use inverse_color_order to find color index faster.
  Rewrite some loops to avoid -Wunsafe-loop-optimizations warnings.
  Remove some useless casts
  Add compiler warning flag -Wextra and fix related warnings.
  Declare some array sizes to be constants (known at compile time).

* changes:
  Add complier warning -wunused.
  angle estimation: Some renames/tweaks to sync with aomedia code.

Change-Id: Ide4e9b3a605571ec41c265347217e103df8d0821

Handle the sub8x8 chroma component at the unit of 2x2/4x2/2x4 level
and use the motion vector inherited from the luma component. This
improves the coding performance:

lowres 0.4%
midres 0.25%
hdres  0.15%

Change-Id: I34dff4218cfa3e5d55e7ed0341f36f4719389f7e

Remove the separate implementations of set_contexts() in encoder
and decoder.

Change-Id: I9f6e9b075532faae0f74f885d9443589254258a7

Change-Id: I1da08afaa945ca1aaf4bf9f50cf649a7feef2e60

The av1_mv_class0_tree is a balanced tree with two leafs and can
 simply be coded as a boolean with probability class0[0].
If CLASS0_SIZE is ever changed from 1, this change will need to be
 reverted.

Change-Id: If294dac825a5f945371092c74aa8e3f84cd962b6

When building with --enable-daala_ec, the tx_type for intra blocks can be
 coded using the CDFs that are updated once per frame.
This patch converts a tx_type symbol to be coded with aom_write_symbol()
 and aom_read_symbol() that was missed in f3e8e267.

Change-Id: I34f8fef7525f88e156bbcb78dfc48994367610ce

Change-Id: I90ef3b49b499c2ac9c24797467cb4eb194fdf23b

The duplicate breaks build.

Change-Id: I0f16761c4bcb8563402a664013429403b883c2e1

In a previous commit: 5db9743f, two
changes that appeared to be typos are breaking build when experiments
are enabled:

../../libvpx/configure --enable-experimental --enable-ref-mv
--enable-ext-intra --enable-ext-refs --enable-ext-interp
--enable-supertx --enable-var-tx --enable-entropy --enable-ext-inter
--enable-ext-tx  --enable-motion-var --enable-dual-filter
--enable-ext-partition --enable-ext-partition-types
--enable-loop-restoration --enable-rect-tx --enable-palette
--enable-aom-highbitdepth --enable-filter-intra --enable-internal-stats
&& make clean && make -j16

This commit fixes the issue.

Change-Id: I9ce5bbc96df326214202868cb0669bd334c86851