Removing unused functions.

Removed functions:
  model_rd_for_sb_y,
  block_error_sby,
  get_sb_variance

Change-Id: Iec458df180caf6f8eac3605773841a4121dd3a8f
Changing the order switchable filter enum constants.

This changeset allows to remove vp9_switchable_interp and
vp9_switchable_interp_map arrays and make code much clear. Actually we
still have to use these mapping but only inside read_interp_filter_type and
write_interp_filter_type functions.

Change-Id: I4026c6f8c4acefba6c81421b7bacbaa52cc45f50
Add variance based mode/skipping

Adds a speed feature to skip all intra modes other than
DC_PRED if the source variance is small. This feature is
made part of speed 1 and up.

Results on derf300: psnr -0.07%, speedup about 1-2%

Also uses the source variance to fine-tune the early
termination criteria when FLAG_EARLY_TERMINATE is on.
This feature is made part of speed 2 and up.

Results on derf300: psnr -0.52%, speedup about 5-7%

Change-Id: I59e38aa836557cfa5405ae706fc64815cbfe4232
Finally removing all old block size constants.

Change-Id: I3aae21e88b876d53ecc955260479980ffe04ad8d
reworked config for use_x86_inc

Support enabling it or disabling it.  Moved read out to configure.sh
so that its done once instead of in make and in config.

Change-Id: I73a9190cf31de9f03e8a577f478fa522f8c01c8b
block error / x86inc mods

Change-Id: Icb607745634e10b9bac5019d06661ece09fcdb40
intrapred x86inc guards

Change-Id: If0399d8e11f4ebe75a5c91abb8d6a52a7709065b
Move fdct32x32 SSE2 implementation in separate file.

This is in preparation for the SSE2 version of the high-precision
32x32 forward DCT which will share a lot of code with the existing
low precision version used for rate-distortion search.

Change-Id: I7084b6bdfb480b1fabb8493fb14e3f7fcc7888c0
Merge "Add variance based mode/skipping"
Merge "Removing unused functions."
Merge "Changing the order switchable filter enum constants."
Merge "Finally removing all old block size constants."
Motion vector code cleanup.

Converting arguments of two functions (clamp_mv_ref, lower_mv_precision)
from int_mv* to MV*. Rewriting is_inside function to make it much shorter.

Change-Id: Ie4c4cf3eccd46707c7df099ec21fb1b61c72fc7a
Merge "intrapred x86inc guards"
Merge "Move fdct32x32 SSE2 implementation in separate file."
Inlining vp9_get_pred_probs_switchable_interp function.

There was no benefit having this function. For example, inside
read_switchable_filter_type switchable filter context was calculated twice.

Change-Id: I79cd5bf95cbc0f6d8bf91a2e32289e01b18dcff1
Place holder for high-precision 32x32 fdct

Resolve compile warnings on re-define FDCT32x32_2D template.

Change-Id: Idb3a54ef8d2710ce7245b726379a0e5c875f5cad
Flexible support for various pattern searches

Adds a few pattern searches to achieve various tradeoffs
between motion estimation complexity and performance.
The search framework is unified across these searches so that a
common pattern search function is used for all. Besides it will
be easier to experiment with various patterns or combinations
thereof at different scales in the future.

The new pattern search is multi-scale and is capable of using
different patterns at different scales.

The new hex search uses 8 points at the smallest scale
and 6 points at other scales.
Two other pattern searches - big-diamond and square are
also added. Big diamond uses 4 points at the smallest scale and
8 points in diamond shape at the larger scales.
Square is very similar conceptually to the default n-step search
but is somewhat faster since it keeps only one survivor across
all scales.

Psnr/speed-up results on derf300:

hex: -1.6% psnr%, 6-8% speed-up
big-diamond: -0.96% psnr, 4-5% speedup
square: -0.93% psnr, 4-5% speedup

Change-Id: I02a7ef5193f762601e0994e2c99399a3535a43d2
Merge "Inlining vp9_get_pred_probs_switchable_interp function."
sad + miscellaneous updates

Enable use_x86inc as a commandline option.  Fix Bug with sse2 when
x86inc is disabled. Adds Sad asm protection to x86inc protection

Change-Id: Iee0f9dd235ea10e8ace512eb362ba9bebe8c9df6