Change-Id: I1b77416eaae000ae40e139d8f7fc31754f817bba

CfL is now an independent mode.

Results on Subset1 (Compared to 4266a7ed with CFL enabled)

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.1645 | -0.4017 |  0.2475 |  -0.1851 | -0.2179 | -0.2338 |    -0.2897

Change-Id: I2e86e7ea7bfc12bb1d763e70a136ca992d57a3c5

A separate prediction mode struct is added to allow
for uv-only modes (like CfL). Note: CfL will be
added as a separate mode in an upcoming commit.

Results on Subset1 (Compared to 4266a7ed with CfL enabled)
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0000 |  0.0000 |  0.0000 |   0.0000 | 0.0000 |  0.0000 |     0.0000

Change-Id: Ie80711c641c97f745daac899eadce6201ed97fcc

- Use 'tx_size' in function signatures.
- filter_intra_taps_3 and filter_intra_taps_4 updated to support
  TX_SIZES_ALL (thanks to yuec@)

With these changes, filter-intra works correctly with rect-intra-pred.
So, we remove the temporary workaround for this.

Change-Id: Ide0f593419c21a74c08c61859f8dad918ca169fa

For chroma DC_PRED, cfl_predict_block and av1_predict_intra_block are
redundant,

Results on Subset1 (compared to  e1c27392 with CfL enabled)

  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0000 |  0.0000 |  0.0000 |   0.0000 | 0.0000 |  0.0000 |     0.0000

Change-Id: Id50f3682eaccb5370e29d66af8a9967a30d135e6

Large rectangular blocks (BLOCK_64x32 and BLOCK_32x64 in baseline) don't
have corresponding transform sizes.
So, for such blocks, we revert to performing 2 predictions of square
transform sub-blocks (TX_32x32 in baseline).

Change-Id: I77e79223fbff514b5706b103de3f02401dba7ffe

Make the intra prediction boundary condition account for the
64x64 processing unit constraint. This avoids a rare enc/dec
mismatch issue in 128x128 intra coded block.

Change-Id: Idb05cae8b17ae94c7a4e49e5d58b5865e5fc2f7d

Disable the 2 sample adjustment when chroma_sub8x8 is enabled.

Bdrate: midres: -0.02, cif: -0.0

Change-Id: If86a64b49a2f5b284bc833f36d9f8a05235741bc

This patch adds support for 4:1 rectangular blocks to various common
data arrays, and adds new partition types to the EXT_PARTITION_TYPES
experiment which will use them.

This patch has the following restrictions, which can be lifted in
future patches:

  * ext-partition-types is incompatible with fp_mb_stats and supertx
    for the moment

  * Currently only 32x32 superblocks can use the new partition types

There's a slightly odd restriction about when we allow
PARTITION_HORZ_4 or PARTITION_VERT_4. Since these both live in the
EXT_PARTITION_TYPES CDF, read_partition() can only return them if both
has_rows and has_cols is true. This means that at least half of the
width and height of the block must be visible. It might be nice to
relax that restriction but that would imply a change to how we encode
partition types, which seems already to be in a state of flux, so
maybe it's better to wait until that has settled down.

Change-Id: Id7fc3fd0f762f35f63b3d3e3bf4e07c245c7b4fa

The function cfl_compute_parameters is added and contains the logic
related to building the CfL context parameters. As such, many cfl
functions can now be encapsulated inside of cfl.c and not exposed to the
rest of AV1.

This also allows for supplemental asserts that validate that the CfL
context is properly built.

Results on Subset1 (compared to 9c6f8547 with CfL)

  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0000 |  0.0000 |  0.0000 |   0.0000 | 0.0000 |  0.0000 |     0.0000

Change-Id: I6d14a426416b3af5491bdc145db7281b5e988cae

cb4x4 itself should not require these sizes.

This simplifies compatibility with other experiments, since we can
first make them work with cb4x4 (which is now on by default), and
then worry about chroma_sub8x8 and chroma_2x2 (which is not) in
separate steps.

Encoder and decoder output should remain unchanged.

Change-Id: Iff2a5494cab3b7d96f881e8bd9cd4bf18c817cfa

avoid warnings about left shift of negative numbers.

BUG=aomedia:617

Change-Id: I8793132c562759b0cc9eefb7c7a50fddb3149184

changes shifts to multiplications

BUG=aomedia:617

Change-Id: I46a7b3b5d566f8c671e54d8cb876cc53fdc5009d

Change-Id: Ib28bd27d0c2b2e1eb89ef3168b4293f8aa1712bc

Updates to intra-edge experiment

- Convert VP9-style intra pred to Ext-intra style
- Upsample edge predictors by 2x based on angle and edge size

BD-rate, 1-kf AWCY
  360p:  -0.11%
  720p:  -0.54
  1080p: -0.96

Change-Id: Ib73805d31d5d286e607a7ee7470fcbdf11edbbff

Extract the compution of the luma reconstructed average out of cfl_load
and into cfl_compute_average. The reconstructed luma average is stored
in the CFL_CONTEXT to avoid computing it for each transform block and
for each plane.

Results on subset1 (compared to 803bea26 with CfL)
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0474 | -0.1486 | -0.2931 |  -0.0358 | -0.0397 | -0.0127 |    -0.1162

Change-Id: I9e34af0fe5961ce8dbe70cb80aea2a16221d0d92

plane_bsize is now computed properly. This also includes support for the
special case of blocks < 4X4

Results on subset1 (compared to 8e689e4b with CfL)
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0218 | -0.2328 | -0.2555 |  -0.0230 | -0.0379 | -0.0723 |    -0.1205

Change-Id: I6ec87d818d8df6a40ecf3bb1b86954e59c952930

Earlier, intra prediction for rectangular blocks was performed by
running two steps of prediction on square sub-blocks.

With this experiment, we do proper intra prediction for rectangular
blocks. This ensures that we make use of all available neighboring
pixels especially for directional modes. For this, all the intra
predictors were updated to work with rectangular transform block sizes.

Performance improvements are small but free of cost:

All Intra frames:
lowres: -0.126
midres: -0.154

Video Overall:
lowres: -0.043
midres: -0.100

[Could not get AWCY results due to a backlog.]

BUG=aomedia:551

Change-Id: I7936e91b171d5c246cb0a4ea470a981a013892e6

For intra edge filtering experiment, replace the 2x iteration
(5-6-5) filter with a 5-tap filter (2-4-4-4-2).

BDrate (1 key-frame) for this change:
cif:    +0.02%
midres: +0.04
720p:   -0.01
1080p:  -0.03
4k:     -0.01

BDrate (1 key-frame) for intra-edge experiment:
(05/31, disable rect-tx, ext-tx, delta-q, ext-delta-q)

          1 key-frame     60 frames
         PSNR   SSIM     PSNR  SSIM
cif:    -0.02   -0.01   -0.03  -0.01
midres: -0.02   -0.02   -0.05  -0.10
720p:   -0.36   -0.39   -0.05  -0.06
1080p:  -0.75   -0.88   -0.22  -0.27
4k:     -0.91   -1.12   -0.45  -0.54

Change-Id: I834037e662b4483d4d6bdceb1c1624d56ba293a4

cb4x4 itself should not require these sizes.

This simplifies compatibility with other experiments, since we can
first make them work with cb4x4 (which is now on by default), and
then worry about chroma_2x2 (which is not) in separate steps.

Encoder and decoder output should remain unchanged.

Change-Id: I4e9fcdae49f238b5099a3c74a398fe993c2545f8

These conditions in has_top_right() are never true when cb4x4 is
enabled.

The corresponding check in has_bottom_left() is already behind a
similar #if.

This is needed by a subsequent patch to move sub-4x4 block sizes
behind their own configuration flag, since that changes the value
of bw_unit, which might cause the condition to become true when it
should not be.

Encoder and decoder output should remain unchanged.

Change-Id: I648654dfc265f911d83668d94dc927ebc0c70771

Currently the "transform units" used to measure transform sizes
in some parts of the code are based on the smallest defined
transform size.

cb4x4 currently defines a 2x2 transform size, even when chroma_2x2
is not enabled, which means that the scale of the transform units
was always double that of MODEINFO units.

Several areas of the code were hard-coding this assumption instead
of converting from one to the other using appropriate constants.

Change-Id: Iff437425f2c5abd02a82ff1c7c8002aefc2f75a6

Currently the "transform units" used to measure transform sizes
in some parts of the code are based on the smallest defined
transform size.

cb4x4 currently defines a 2x2 transform size, even when chroma_2x2
is not enabled, which means that the scale of the transform units
was always double that of MODEINFO units.

Several areas of the code were hard-coding this assumption instead
of converting from one to the other using appropriate constants.

Change-Id: I86057b85b7d4cd810d87da28f5eedc5b27597e29

BUG=aomedia:545

Change-Id: I8beacce0f87b52dfd614bcd8c88426839c4ba51d

Change-Id: Id6078c5e3c82bc382af7b576133beb9026797a9b

Change-Id: I18dc1acf25977b42b2bba73eab00b461a66c49b6

Harmonize the low-bitdepth and high-bitdepth.

Change-Id: I533f717ca189a5e577719821ea5aea940e3b6223

For ext-intra directional modes, filter intra edge samples
dependent on block size and prediction angle.

Congiguration:
./configure --enable-experimental --enable-ext-intra
  --enable-internal-stats --disable-cdef --disable-delta-q

Coding gain (1 frame Intra):
cif:    -0.03%
midres: -0.01
720p:   -0.65
1080p:  -0.83
4k:     -1.19

Change-Id: I372bfc7614f6a07fe1d8e7b61bd0b6660f9fb4a1

(1) clipping output of intra filter right away to stop
unreasonable pixel values from propogating.
(2) fix wrong filter coefficients

Bug=aomedia:418

Change-Id: I2620034ad03b499afb64da6cadb17fc1aa221c44

Move cfl_idx_to_alpha in the header to facilitate inlining.
Remove the forward MB_MODE_INFO forward declaration

Change-Id: Id33fb0228d88b6285252843e2345a0d3ae875cd2

For 'left' array indices -1 onwards are valid (left[-1] == above[-1] ==
the top-left reference pixel).
So, make sure that 'base2' is in that range too.

Change-Id: If5118d97d4ef85f6520363bd648bfe6948c1211f

This experiment extends ALT_INTRA by adding two new modes:
smooth horizontal and smooth vertical.

Improvement on *intra frames* in BDRate (PSNR):
===============================================

AWCY (high latency): -0.46%
(Also, -1.0% or more on PSNR Cb,Cr and APSNR Cb,Cr).

AWCY (low latency): -0.43%
(Also, -0.88% to -0.94% on PSNR Cb,Cr and APSNR Cb,Cr).

Google sets:
lowres: -0.454
midres: -0.484
hdres:  -0.525

Improvement on *video overall* in BDRate (PSNR):
================================================

AWCY (high latency): -0.15%

Google sets:
lowres: -0.085
midres: -0.079

Change-Id: I9f4e7c1b8ded1fe244c72838f336103ccc715d50

'const_above_row' was same as 'above_row' and 'above_row' pointer was
never modified.

Change-Id: Ib0c2524b1afc75967cfa7d3da8e59cfc66299ff4

Writes and reads alpha to and from the bitstream.

A special case is needed on the encoder side to handle prediction block
skips. Since whether or not a prediction block is skipped during CfL, a
rollback is required if the block was skipped and the alpha index was
not zero. The advantage of this is that no signaling is required when
the prediction block is skipped as it is assumed tha the alpha index is
zero.

A encode facade is added to the intra prediction facade as CfL requires
special encoder side operations.

Change-Id: Ic3b11d0fdbd51389d862112eb09d8785127a6b06

Properly account for the intra boundary condition for sub8x8
chroma components in the modified chroma-2x2 framework. This fixes
a rare enc/dec mismatch issue when chroma-sub8x8 is turned on.

Change-Id: I058a2fb855a491bf604277f4c82169c1b55424fa

This resolves a static analyis error.

Change-Id: I39360ae17af7e41f00e5c5edce5163bd98b920fa

Loads the stored reconstructed luma pixels for each trasnform block
inside a prediction block. Supports 4:4:4 and 4:2:0 chroma subsampling
modes.

The CFL_CTX struct is now in cfl.h with appropriate forward declarations

Change-Id: I44c117899414a10a8318d14ecaed402f803de97d

BUG=aomedia:448

Change-Id: Idc76c954435517a50a9cfa8e54fb73a593aaaac6

Change-Id: Ia77395197927aaf34e1f17af0a824d29faa1924c

Remove the code about block size dependent angle steps and deltas,
as they are modefied to be the same for all blocks in c81ea6e0.

BUG=aomedia:442

Change-Id: I54607dd752ef895c1418f979410b14c02fc9ce22