Adds RD integration for 32x16, 16x32, 64x32 and 32x64 rectangular blocks.
Derf almost +0.6%, HD a little over +1.0%, STDHD +1.3%.

Change-Id: Id651fdb6a655fdbb5c47009757e63317acfb88a5

Enable recursive partition information coding from SB64X64 down to
MB16X16. The bit-stream syntax is now supporting rectangular block
sizes. It starts from SB64X64 and recursively describes the partition
type of the current block. If the partition type is PARTITION_NONE,
the block is coded as a single unit; if it is PARTITION_HORZ or
PARTITION_VERT, the block is segmented into two independently coded
rectangular units, with no further partition needed; otherwise, the
block is segmented into 4 square blocks. i.e., PARTITION_SPLIT case,
each can be potentially further partitioned.

Forward adaptive probability modeling is used for the partition
information coding, conditioned on the current block size.

Change-Id: I499365fb547839d555498e3bcc0387d8a3587d87

Also a little bit of code cleanup: replacing pbi->common with cm,
pbi->mb with xd.

Change-Id: I2f70a005704a2833d644dfaafc4cd354e6e8532b

Merge "Slightly hackish workaround to support rectangles in directional intra predictors." into experimental

Change-Id: I7057ed8e2a13a3c5367e2923eb4b3260bd7cf546

Change-Id: Ic795cf6fc202bf32c9b5b0b3cef9ac422af53cd0

Scalar path is about 1.3x faster (2.1% overall encoder speedup).
SSE2 path is about 5.0x faster (8.4% overall encoder speedup).

Change-Id: I360d167b5ad6f387bba00406129323e2fe6e7dda

Change-Id: I8a4da6925f2d58a426c4d122df8b97bb69452e49

This flag was added to VP8 to allow a mode where MB-level skipping
was not allowed, saving a bit per mb. It was never used in practice,
and hasn't been tested in VP9, so remove it.

Change-Id: Id450ec6904c6d06c1919508e7efc52d05cde5631

tx_type == DCT_DCT check is an implementation detail of iht_add. Also
adding dequant_add_y function with explicit DCT_DCT check inside.

Change-Id: Ia3cb0225601752cdef0ff6f0acd3a09d9dbd8938

In decoder, the scaling calculation, such as (mv * x_num / x_den),
is fairly time-consuming. In this patch, we check if the scaling
happens or not at frame level, and then decide which function to
call to skip scaling calculation when no scaling is needed. Tests
showed a 3% decoder performance gain.

Change-Id: I270901dd0331048e50368cfd51ce273dd82b8733

Now that the predictor is the dest, we do not need the
extra parameters.

Change-Id: I31e2c3d2015f4a1cd12e7f04536d8db478582a0a

Using regular 0 and 1 constants now.

Change-Id: Ie763503cbb727847cc8f1d6506cd6f2ee607f056

This is the first CL with vp9_reader changes. All another macro
definitions will be replaced after.

Change-Id: I1c6bd9c9a612ec1663d484d6adb4fb720af54063

Keyframes don't set this variable, so it would use the last set
values from inter frames.

Change-Id: Ie1ef45ece2c44b21b5d55f6cea9f7d6e7a445692

With this, the RD loop properly supports rectangular blocks.

Change-Id: Iece79048fb4e84741ee1ada982da129a7bf00470

Static threshold results slightly up (+0.1% on derf), probably b/c
we now take the filter (sharp/lowpass) into account for the breakout
decision.

Change-Id: I9f597601da434205142afd05f32690e7ba8fd690

Change-Id: Ieaec2c48f3752b8558ba051caaf4ba2ab0e9e84d

Using ROUND_POWER_OF_TWO macro, using array initialization syntax for
less code.

Change-Id: I661453a6b29a9046fcff0a3f18fccb452b5eb39d

Now that the predictor is the dest, we do not need the
extra parameters.

Change-Id: I78db73d39b5aff62f15303f3d51ad2797eae74b6

Change-Id: I697514efd6024e1b4153bbde58ae5e323b030981