SBITS=8 is reported 20-30% faster on ARM (where 64bit ops
are expensive).
Also use 32bits for i32.
Change-Id: Id6a7197d805061aeb8832f20432512d0d930ebfa
fixes the 'blocky sky problem' (saturation problem: when luma was flat,
chroma noise was taking over, resulting in random segment id assigned.
When just using a common uniform segment was better).
+ side clean-up and readibility/experimentability MACRO'ization
+ added '-map 7' option
Change-Id: I35982a9e43c0fecbfdd7b05e4813e8ba8c121d71
this will avoid the "dec_neon.o has no symbol" warning
no change in binary size observed on linux.
Change-Id: Ia27ae2bc5a03d714afa7e46671fdcf4cb630784d
* 0.2.0: (42 commits)
Update ChangeLog
dec/io.c: cosmetics
RGBA4444: harmonize lossless/lossy alpha values
fix RGBA4444 output w/fancy upsampling
Alignment fix
avoid rgb-premultiply if there's only trivial alpha values
fix the ARGB4444 premultiply arithmetic
Lossless decoder fix for a special transform order
Update encoding heuristic w.r.t palette colors.
remove unused ApplyInverseTransform()
Update ChangeLog
update AUTHORS
update NEWS
add support for ARGB -> YUVA conversion for lossless decoder
bump version to 0.2.0
fix alpha-plane check + add extra checks
MODE_YUVA: set alpha to opaque if the image has none
silence one more warning
move some RGB->YUV functions to yuv.h
README: sync [cd]webp help output
...
Change-Id: I4c4e3be2e88655d25d4dd2eae46c580d960b12ac
lossy was rounding with a bias toward opaque:
[232+, 8] -> [15, 1]
now both paths use the range:
[240+, 16] -> [15, 1]
Change-Id: I3da2063b4959b9e9f45bae09e640acc1f43470c5
With this, MODE_rgbA can safely be used without speed penalty
even in case of pure-lossy alpha-less input.
It's also an optimization when cropping a fully-opaque region from
an image with alpha: premultiply is then skipped
Change-Id: Ibee28c75744f193dacdfccd5a2e7cd1e44604db6
* green was not descaled properly
* alpha was over-dithered, making the value '0x0f' not be a fixed point
* alpha value was not restored ok.
Change-Id: Ia4a4d75bdad41257f7c07ef76a487065ac36fede
Fix the lossless decoder for the case when it has to apply other
inverse transforms before applying Color indexing inverse transform.
The main idea is to make ColorIndexingInverse virtually in-place: we
use the fact that the argb_cache is allocated to accommodate all
*unpacked* pixels of a macro-row, not just *packed* pixels.
Change-Id: I27f11f3043f863dfd753cc2580bc5b36376800c4
Added a threshold of MAX_COLORS_FOR_GRAPH for color-palettes, above
which the graph hint is ignored.
Change-Id: Ia5d7f45e52731b6eaf2806999d6be82861744fd3
spurious in this case, but addresses e.g.,
... potentially uninitialized local variable 'weighted_average' used
Change-Id: Ib99998bf49e4af7a82ee66f13fb850ca5b17dc71
Order-by-cost mostly unchanged (up to a scaling constant 1/log(2))
(except for few minor diff in < 2% of cases)
+ remove unused field cost_mode->cache_bits_
Change-Id: I714f8ab12f49a23f5d499a64c741382c9b489a3e
