Tuned the cross_color transform parameter (step) for lower quality
levels. This change gives speedup of 20% at lower qualities (25) and 10% at
moderate quality level (50) with a loss of 0.25% in compression density.
Also removed TODO for cross_color transform. Observed good correlation of
this with the predict transform.
Change-Id: I8a1044e9f24e6a5f84295c030fd444d0eec7d154
rather than symlink the webm/vpx terms, use the same header as libvpx to
reference in-tree files
based on the discussion in:
https://codereview.chromium.org/12771026/
Change-Id: Ia3067ecddefaa7ee01550136e00f7b3f086d4af4
The auto-infer logic of detecting the 'Alpha' use case
(via check '(palette[i] & 0x00ff00ffu) != 0' is failing
for this corner case image with all black pixels (rgb = 0)
and different Alpha values.
-> switch generic use-LUT detection
Change-Id: I982a8b28c8bcc43e3dc68ac358f978a4bcc14c36
Added 1 pixel cache for palette colors for faster lookup.
This will speedup images that require ApplyPalette by 6.5% for lossless
compression.
Change-Id: Id0c5174d797ffabdb09905c2ba76e60601b686f8
'mem' was being offset once by DO_ALIGN() then shifted 'nz_size' which
would end up accounting for more than ALIGN_CST and exceed the allocation.
broken since:
9bf3129 align VP8Encoder::nz_ allocation
Change-Id: I04a4e0bbf80d909253ce057f8550ed98e0cf1054
* "declaration of ‘index’ shadows a global declaration [-Wshadow]"
* "signed and unsigned type in conditional expression [-Wsign-compare]"
Change-Id: I891182d919b18b6c84048486e0385027bd93b57d
Earlier such images were using roughly 9 * width * height bytes for
decoding. Now, they take 6 * width * height memory.
Change-Id: Ie4a681ca5074d96d64f30b2597fafdca648dd8f7
Simply get rid of an intermediate buffer of size width x height, by
using the fact that stride == width in this case.
Change-Id: I92376a2561a3beb6e723e8bcf7340c7f348e02c2
no precision loss observed
speed is not really faster (0.5% at max), as forward-WHT isn't called often.
also: replaced a "int << 3" (undefined by C-spec) by a "int * 8"
( supersedes https://gerrit.chromium.org/gerrit/#/c/48739/ )
Change-Id: I2d980ec2f20f4ff6be5636105ff4f1c70ffde401
it's not often the case, but could happen, that chroma has non-zero
coeff but luma hasn't. In such case, we should skip luma right away
Change-Id: I9515573ffaec8aad8b069d2c02ffbda4a6eff97c
