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When the "dy" variable is between -1 and 0 (base2 == -1)
we should interpolate between the upper-left(-1,-1) and left(-1,0)
samples, instead of just taking the left sample.

Coding gain improves a bit with this change.

BUG=aomedia:357

Change-Id: If520f71b22115e79120499c21f8d6925c1fa24be

This commit fixes the encoding/decoding mismatch issue when
ext-partition and ext-partition-type are both turned on in cb4x4
mode.

BUG=aomedia:336

Change-Id: I4d6ad5863c9d3bc8e3a41c259b8b39f130164790

If part of a block falls outside right and/or bottom image boundary,
then only store tokens for the part of it within the boundary.

Also, consider only the part of the block within the boundary when
calculating the number of colors in the image, deciding the base
colors for palette, RD calculation etc.

The part of color map corresponding to pixels outside the image
boundary is padded with color indices copied from same row/column.
This behavior is similar to how pixels outside the boundary are padded.

For screen_content set, this is improves compression performance by
0.038 overall. One clip, in particular, has a significant gain of 0.8.

Change-Id: I745ca032f313c5041aacc98c03ae4bfc33d840de

Now that https://aomedia-review.googlesource.com/#/c/6729/
has been merged, build_intra_predictors_for_interintra() is
now redundant, so replace it by a direct call to
av1_predict_intra_block() and remove the old function.

Reset rect_interintra back to 1.

To do this, we need to make the intra predictor take a
BLOCK_SIZE instead of a TX_SIZE. This is because we need to
be able to predict 32x64 and 64x32 blocks, but there is no
TX_32X64 or TX_64X32.

No effect on output or performance.

Change-Id: I8c185a211c97a85012cc54ec293c785a693608ed

This commit resolves an enc/dec mismatch issue when both filter-intra
and cb4x4 modes are enabled.

BUG=aomedia:253

Change-Id: I4026d93c00a819f2ce69aedba9d34a774319acbf

Fix an encoding failure issue when var-tx is enabled, while ext-tx
and rect-tx are disabled. This doesn't change coding statistics
when all are enabled.

Change-Id: I4b32387a0a1497380980f8087832aaf6467cdcbe

Fix the intra block coding order when both ext-partition-type and
cb4x4 modes are turned on.

Change-Id: Iaaaf4742c53c4778526974f9d1dfdaed6ca3ce3c

This commit resolves the coding pipeline breakage when ext-partition
and cb4x4 are both enabled.

BUG=aomedia:138

Change-Id: Ic17da68af80d7a66565b0e1c69b895be27282a9a

These are under EXT_TX + RECT_TX experiment combo.

Results
=======

Derf Set:
--------
All Intra frames: 1.8% avg improvement (and 1.78% BD-rate improvement)
Video: 0.230% avg improvement (and 0.262% BD-rate improvement)

Objective-1-fast set
--------------------
Video: 0.52 PSNR improvement

Change-Id: I1893465929858e38419f327752dc61c19b96b997

This resolves an enc/dec mismatch issue in the intra prediction
modes.

Change-Id: I8655621332d955e718b9341e208e837c91e2acf0

Failure brought by 45dc597a

Also harmonize the high-bit-depth and regular versions
of directional intra prediction.

Change-Id: I7ed6602ccbfb53470cb7e9d8f428b17a860ca596

Miscellaneous changes. Mostly code simplification and cleanup.

Make luma max angle delta depend on block size, which is the
way it was before the nextgenv2 branch merge.

Also some fixes for compatibility of ext-intra and alt-intra.

Change-Id: I2ce869e6ba7dee765a8dc4802f5e88040db3df22

intra-interp experiment allows intra prediction to use different
interpolation filters. It was part of the ext-intra in the nextgenv2
branch.

Change-Id: I27ab692494dc79bb92e457dbf9a72988577f1c6d

The previous refactoring CLs resolve all the potential issue
related to these two conditions. It is safe to remove them now
from the cb4x4 mode.

Change-Id: Ieeb1ca2804318c1f46b60c041538f8ca5f6ba0e7

Replace the 4x4 block counting with minimum transform block size
counting. This retains identical coding statistics.

Change-Id: I13ce6b5b62641304b0ff1c6efd34c6a590195792

Scale up the mb_mode_info resolution from 8x8 to 4x4 unit.

Change-Id: I60ee20f5fc353a3c16ced14b55422fc5e4ea1e06

Map the block offset to pixel positions in the unit of minimum
transform block size. This change retains the same coding
statistics. The encoding speed is slightly faster (<1%).

Change-Id: I2641d2b1e317ef4cdf477718c446ef025b8eef41

Use direct table access to fetch the transform block width and
height in the unit of pixel.

Change-Id: I80a90729bc0d078f918ffafff612fb29afa0e761

Bring 2x2 intra prediction online for chroma components.

Change-Id: Ia56af9101b2a977691bca4156a6dcf89e644b4a7

Correctly use FILTER_INTRA_MODE enums instead of PREDICTION_MODE enums.

Change-Id: I3d89c0c5a926b9f8603b8492e7c8c9b32b41d4cc

Add 2x2 block size syntax to the codec system. It prepares for the
4x4 coding block unit for 420 format. This change retains the same
coding statistics.

Change-Id: If8e9a31bd6b4b75bc994539dc4dd8021d455ba57

Change-Id: I2a814ba878a57c6b73f8f9e29bea6c7edfe7c789

This is added as part of ALT_INTRA experiment.

This uses interpolation between top row and estimated bottom row; as
well as left column and estimated right column to generate the
predicted block.The interpolation is done using a predefined weight
array.

Based on experiments, the currently chosen weight array was created
to represent a quadratic curve, but can be tuned further if needed.

Improvement from baseline on Derf set:
ALL Keyframes: 1.279%

Improvement from existing ALT_INTRA:
ALL Keyframes: 1.146%

Change-Id: I12637fa1b91bd836f1c59b27d6caee2004acbdd4

Generalize intra buffer size to cover 64x64 txfms.
Fix tx_size encodings.

Change-Id: Ibc219d291b850a600c3a1370d88769a7640fb4d2

This commit fixes a build error where returned value does not match
defined return type.

Change-Id: I1d2c879d0cf7d90fcc7105683695a371c9fe9f58

Fixes warning error introduced by : aom/5942

Change-Id: I1e2c013a3f8859bbcf4548a67347011f4b0fb650

Change-Id: I2536b5b55f28c2ee59445c3b70d3e073e69945cd

BUG=aomedia:81

Change-Id: Ia9c853b38463aa88e1d6c1df49a5930f78add77d

Change-Id: I078bb5244dbff153bcfab226206540ca6cebdad0

Replaces a couple of hard coded numbers with TX_SIZES macro
in common/reconiontra.c

Change-Id: I8a2a53ca16bc3ab51409cec340bea55292ff2dee

Change-Id: Id66a14a869df8317c5bbb693d14262326fe84206

Simplify the input arguments. Make direct use of the block size
in the unit of pixels.

Change-Id: Ifec9d90b4b4fa9605f93b4f93b8242f76f898b5f

Change-Id: I1e4a43f5f08b76867240a207c60d7e85a8ffbb74

Use a single header reconintra.h for all intra prediction
related codes.

Change-Id: Ib869447f8c482b534c890eab673e81ff830e8d85

Prepare for the av1/nextgenv2 merge.

Coding gain (%):

               lowres     midres
ext-intra       0.69       0.97
filter-intra    0.67       0.83
both            1.05       1.48

Change-Id: Ia24d6fafb3e484c4f92192e0b7eee5e39f4f4ee6

Currently the RD loop traverses 4X8 blocks in inverted N order while
the bitstream stores blocks smaller than 8x8 in Z order. This causes a
discrepancy where the RD loop reads uninitialized data while
performing intra prediction.  As a temporary fix simply disable the
use of the extended right edge for 4X8 blocks, until the bitstream can
be changed to match the logical structure of the blocks.

Change-Id: I44a9e4fc1a15cd551a7b38c3c1227bc5dac77e9a

From code only part of nextgenv2 (and not aomedia)

Change-Id: I21f7478a59d525dff23747efe5238ded16b743d2

This flag was already added to aomedia/master, so bringing it back to
webm/nextgenv2, as part of an effort to get the two codebases in sync.

Change-Id: I2b933a6a160e4210d1411a9e7978149eb8553205

Manually cherry-picked from aom/master:
bf2ad75a

Change-Id: I99f05e79ec8ad35a49bc124e6dd829ccc7d9cc36

Change-Id: Id78139ae2dfa2d521bd50618b4a81cf24e09e391