Commit Graph

119 Commits

Author SHA1 Message Date
Pascal Massimino
8ca2076de1 Introduce a 'fast' alpha mode
.. where only 2 filtering modes are potentially
tried, instead of all of them. This is fast than the exhaustive 'best'
mode, and not much worse.

Options for cwebp are:
 -alpha_filter none
 -alpha_filter fast      (<- default)
 -alpha_filter best      (<- slow)

Change-Id: I8cb90ee11b8f981811e013ea4ad5bf72ba3ea7d4
2012-01-09 02:37:44 -08:00
Vikas Arora
252028aaac Add predictive filtering option for Alpha.
Add predictive filtering option for Alpha plane.
Valid range for filter option is [0, 5] corresponding to prediction
methods none, horizontal, vertical, gradient & paeth filter.
The prediction method 5 will try all the prediction methods (0 to 4)
and pick the prediction method that gives best compression.

Change-Id: I9244d4a9c5017501a9696c7cec5045f04c16d49b
2012-01-05 13:55:35 +05:30
Pascal Massimino
30971c9e95 Implement progress report (and user abort)
New cwebp flag is -progress

Change-Id: Ied872cca13f512036860783bbee1bdbccad72768
2011-12-01 14:19:40 -08:00
Vikas Arora
a0ec9aace9 Update WebP encoder (cwebp) to support Alpha.
Updated cwebp (Webp Encoder) binary to support Alpha encoding.
Modified man page and WebP container spec appropriately.

Change-Id: I52f6a5cb3e870c386591e9a7776293fa6a8fb04b
2011-12-01 15:13:17 +05:30
James Zern
099717ce92 manpages: break long lines
Change-Id: I3bea93d358e5c3b3f7dd3c91e433ab4f817d1cd8
2011-11-04 11:25:43 -07:00
James Zern
1daf39bbbc manpages: minor formatting updates
escape '-'s
use consistent section names
webpmux.1:
 document -loop
 create subsections for each OPTION group

Change-Id: If41dc24d80e4a662024e82697d8d2cc4e194a35d
2011-11-04 11:20:59 -07:00
Urvang Joshi
6aedde5891 Add manual for WebPMux tool.
This change adds manual page for the command-line tool webpmux.

Change-Id: I01aed259c9db4bc605433f528a7deff4f5292fbe
2011-09-30 14:04:54 +05:30
Pascal Massimino
dfc9c1eaef Harmonize the dates
Change-Id: I6c6f4766bc217ab0bd2fa6520ce9e2c1cd742b44
2011-09-22 13:50:10 -07:00
Pascal Massimino
900286e091 add a -partition_limit option to limit the number of bits used by intra4x4
Although it degrades quality, this option is useful to avoid the 512k
limit for partition #0.
If not enough to reach the lower bound of 4bits per macroblock header,
one should also limit the number of segments used (down to -segments 1)

See the man file for extra details.

Change-Id: Ia59ffac13176c85b809ddd6340d37b54ee9487ea
2011-08-23 15:58:22 -07:00
Pascal Massimino
fc7815d692 multi-thread decoding: ~25-30% faster
To be enabled with the flag WEBP_USE_THREAD.
For now it's only available on unix (pthread), when using Makefile.unix
Will be switched on more generally later.

In-loop filtering and output (=rescaling/yuv->rgb conversion)
is done in parallel to bitstream decoding, lagging 1 row behind.

Example:
examples/dwebp bryce.webp -v
Time to decode picture: 0.680s

examples/dwebp bryce.webp -v -mt
Time to decode picture: 0.515s

Change-Id: Ic30a897423137a3bdace9c4e30465ef758fe53f2
2011-07-22 15:14:18 -07:00
Pascal Massimino
d260310511 add Advanced Decoding Interface
You can now use WebPDecBuffer, WebPBitstreamFeatures and WebPDecoderOptions
to have better control over the decoding process (and the speed/quality tradeoff).

WebPDecoderOptions allow to:
 - turn fancy upsampler on/off
 - turn in-loop filter on/off
 - perform on-the-fly cropping
 - perform on the-fly rescale
(and more to come. Not all features are implemented yet).

On-the-fly cropping and scaling allow to save quite some memory
(as the decoding operation will now scale with the output's size, not
the input's one). It saves some CPU too (since for instance,
in-loop filtering is partially turned off where it doesn't matter,
and some YUV->RGB conversion operations are ommitted too).

The scaler uses summed area, so is mainly meant to be used for
downscaling (like: for generating thumbnails or previews).

Incremental decoding works with these new options.
More doc to come soon.

dwebp is now using the new decoding interface, with the new flags:
  -nofancy
  -nofilter
  -crop top left width height
  -scale width height

Change-Id: I08baf2fa291941686f4ef70a9cc2e4137874e85e
2011-06-20 15:30:52 -07:00
Pascal Massimino
a11009d7fc SSE2 version of simple in-loop filtering
~10% faster decoding

Patch by Somnath Banerjee (somnath at google dot com)

Change-Id: I200db408272b4f61cda9d9261d2d4370a698d6c4
2011-06-10 15:10:18 -07:00
Pascal Massimino
cfbf88a6c4 add SSE2 functions. ~2x faster encoding on average.
For now, SSE2 functions are compiled a-minima: only on platforms
where __SSE2__ is defined. Let's later add some autoconf-based
config to enable/disable at will.

One can disable SSE2 at run-time by hooking-up VP8GetInfo.
There is a new option "-noasm" in cwebp for that.
Output should be binary the same between C and SSE2 version. If not,
that's a bug!

patch by Christian Duvivier (cduvivier at google dot com)

Change-Id: Iae006c3cdcb7e8280e846cedb94d239dab1e42ae
2011-04-22 15:34:23 -07:00
Pascal Massimino
8aa50efd38 fix some 'man' typos 2011-04-18 18:50:34 -07:00
Pascal Massimino
276ae82512 Remove files not mean to be in git, and update .gitignore
Makes things lighter at the expense of requiring the user
to be up-to-date for autotools.

patch by Jan Engelhardt (jengelh at medozas dot de)

Change-Id: Icfcab2d899828a213d9fade0dab350dacd0c070a
2011-03-29 09:07:06 -07:00
Pascal Massimino
14ceb6e803 add "-version" description to man pages
Change-Id: I699899b11db3b62628c9438f07c379d2ae413031
2011-03-28 11:12:39 -07:00
Pascal Massimino
4704146a1f add missing precision in the man
Change-Id: I55ae0547abf742b4620d9faae7fe5163d8459c19
2011-03-23 17:13:54 -07:00
James Zern
e532b9abb1 Makefile: allow out of tree builds
use top_srcdir rather than top_builddir for AM_CPPFLAGS
add EXTRA_DIST to man Makefile. fixes distcheck target.

Change-Id: I308dc1c98f096de1efe188f63d040ef953598e78
2011-03-15 15:31:25 -07:00
Pascal Massimino
dd60138d20 add man pages for cwebp(1) and dwebp(1)
Change-Id: I450717fc82fff19f16df75aca6a9a567773afd00
2011-03-01 16:07:57 -08:00