- use common file organization across subdir makefiles
- append lib/source/header list variables and sort
Change-Id: I0653e1c73a4552b0c43d21f321b22b4972d6e87b
* each with their own decoder instances.
* Refactor the incremental buffer-update code a lot.
* remove br_offset_ for VP8LDecoder along the way
* make VP8GetHeaders() be used only for VP8, not VP8L bitstream
* remove VP8LInitDecoder()
* rename VP8LBitReaderResize() to VP8LBitReaderSetBuffer()
(cherry picked from commit 5529a2e6d47212a721ca4ab003215f97bd88ebb4)
Change-Id: I58f0b8abe1ef31c8b0e1a6175d2d86b863793ead
import changes from experimental 5529a2e^
and enable build in autoconf and makefile.unix; windows will be treated
separately.
Change-Id: Ie2e177a99db63190b4cd647b3edee3b4e13719e9
Pulled from 5529a2e^.
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.
Change-Id: I490a49cb0084d556a29d7c5257c986ea695ce60c
Pulled from the parent of the current version (5529a2e^).
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.
Change-Id: I6dae97fc381cd6c1d1640c4c565b2084a41ec955
Pulled from the current HEAD (218c32e).
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.
Change-Id: I40538799dbf999abb9408ac83f55b897d8e22498
Pulled from the current HEAD (218c32e).
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.
Change-Id: Ie57be21bf50ad83808c72aeb5fc706d9954d01d8
Pulled from the current HEAD (218c32e).
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.
Change-Id: Id879be453a94d9f44ec8d47747823ca7297ae008
by packing the symbol map more efficiently.
This is mainly useful in making it harder to generate invalid bitstream:
before this change, one could code the same symbol twice. Now, it's
impossible, since we code the position using empty symbol slots, instead
of total position.
* Fix the HasOnlyLeftChild() naming while at it.
Change-Id: I63c56c80a4f04a86ac83eded1e3306329815b6c9
group like parameters together in prototypes, comments, move variable
declarations closer to first use.
Change-Id: Idd6bd87d0366d783fed83f4dd21bd7968cbe6948
_byteswap_ulong is defined in stdlib.h, release builds seem to pull it
in through a different path.
Change-Id: I510d2624150f89a4a77734bf3dc5b4db60a4ba95
- const / move declarations closer to first use
- remove unnecessary ()s
- don't return int unnecessarily with internal Init/Release
- compact some lines
Change-Id: If7ab505e417221debc356f21f075506939110a84
A call to Append/Update would index the parts_ array w/-1 as num_parts_
had yet to be set by DecodePartition0. This would cause corruption
within the VP8Decoder member.
Fixes issue #106.
Change-Id: Ib9f2811594ff19e948a66fda862a4e0a384bb9aa
If the first call to WebPIUpdate contained all of partition 0, but not
enough to decode a macroblock the test for max macro block size could
fail (4096 bytes) due to a memory buffer offset not being updated.
This change offsets the buffer in the same manner as Append().
Fixes issue #105.
Change-Id: I90ca3d0dde92eedc076933b8349d2d297f2469e8
- remove some unused functions
- move global arrays from data to read only section
- explicitly cast malloc returns; not specifically necessary, but helps
show intent
- miscellaneous formatting
Change-Id: Ib15fe5b37fe6c29c369ad928bdc3a7290cd13c84
As with the loop filter, implementing this with intrinsics is difficult
because we require subscript access for reading and writing 32 bits at a
time.
Approximately 5% decode speed improvement. This could be increased by
exposing TransformOne and rewriting TransformTwo to only handle dual
IDCTs.
Change-Id: Idd409264ab5d154a537107a1d54b419a48f7c1a8
Add a dirty_ flag to keep track of updated probabilities and the need to
recompute the level costs.
This only makes a difference for "-m 2" method which was sub-optimal.
But it's overall cleaner to have this flag.
Change-Id: I21c71201e1d07a923d97a3adf2fbbd7d67d35433
This proved being ok, even for large pictures, provided one
takes care of overflow. When an overflow is bound to occur, the
counters are renormalized.
Overall, shaves ~12k of memory.
Change-Id: I2ba21a407964fe1a34c352371cba15166e0c4548
the p0 proba was incorrectly accumulated. Merging its contribution into
the LevelCost[] was creating more problems than anything (esp. with trellis)
so let's just not.
Change-Id: I4c07bfee471085df901228d97b20a4d9606ba44e
These will report the 7x7-averaged PSNR or SSIM, using the
new internal function WebPPictureDistortion().
This is for information only. These flags have no encoding impact.
+misc opportunistic cosmetics
Change-Id: I64c0a7eca679134d39062e438886274b22bb643f
to 'clean up' the fully-transparent area and make it more compressible
new cwebp flags: -alpha_cleanup (off by default, since gain is not 100% guaranteed)
Change-Id: I74d77e1915eee146584cd61c9c1132a41db922eb
gcc-4.0 defines __PIC__ but not __pic__. This leaves the test for
__pic__ should the inverse case exist.
Fixes issue #103; build failing with:
"error: can't find a register in class 'BREG' while reloading 'asm'"
Change-Id: Ia767a733de6ce0294146f9477ff9c46f0ebe13b0
Make sure chunk->data and wpi are not leaked by
MuxAddFrameTileInternal() in case of MEMORY_ERROR in ChunkSetNth().
Change-Id: Ie20e84b92f4bdcb7c3b94520f36b20dd2e730545
Add extern to kChunks[] in muxi.h.
Fixes:
ld: duplicate symbol _kChunks in .libs/muxinternal.o and .libs/muxedit.o
Change-Id: Ibeb060f7fdec5fe904097a2443f0cda2f7ede884
MAX_LEN -> max_len
This was sub-optimal at the end of the picture, when there's
less than MAX_LEN bytes left to match.
Change-Id: I5ebe1fca4e7c112dcd34748a082d1c97f95eb099
often reduces compressed size by ~10's of bytes
+ refactored / sped-up the prediction code (gradient: ~30% faster)
Change-Id: I26bd983655dad4f85d5c5ddc20a1980f384c4dd6
.. 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
Fix bug for Alpha data in RGBA_4444 color-mode.
The Alpha data is required to be clipped [0, 15] while
converting from 8 bits to 4 bits.
Change-Id: I80705d575c35121beb9633a05ec8823435c79586
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
- add check for native log2 to configure
- use a common define (NOT_HAVE_LOG2) to enable use of local library
version for non-autoconf platforms without their own version,
currently msvc and android
This uses a negative (NOT_HAVE_) to simplify the ifdef
Change-Id: Id0610eed507f8bb9c5da338918112853d5c8127a
alpha information is not to be found at RIFF chunks level, not
in the VP8 bitstream (that was a tmp hack)
Change-Id: Idd1629c696b03c26f6f30650d7216f627f1761df
This speeds things up for long message, while not damaging
the stats too much for usual-sized cases
Change-Id: I3f45e28b771d701e2e1da11eb800de18c4ed12fc
- Fix the off-by-one diff when cropping with simple-filter.
- Fix a bug in incremental decoding in case of alpha.
- In VP8FinishRow(), do not decode alpha when y_start > y_end.
- Correct output of alpha channel for MODE_ARGB.
- Correct output of alpha channel for MODE_RGBA_4444.
Change-Id: I785763a2a704b973cc742ad93ffbb53699d1fc0a
Extend WebP Encode functionality to encode Alpha data and produce
bit-stream (RIFF+VP8X+ALPH+VP8) corresponding to WebP-Alpha.
Change-Id: I983b4cd97be94a86a8e6d03b3b9c728db851bf48
Extend WebP decode functionality to extract Alpha data (support ALPH
chunk) and decode the Alpha plane using Alpha (utils/alpha) core-lib.
Change-Id: I6f0ee1b189c13caba3c1dd9b681383bfd00aa212
Add code for Alpha encoding & decoding. The alpha compression is done
via backward reference counts encoded with Arithmetic encoder (TCoder).
Also provided is lossy Alpha pre-processing option via level-quantizations
using kNN heuristic.
Change-Id: Ib6b13530c1a4ab6493edcb586ad29fe242bc1766
- Add alpha support in mux.
- Remove WebPMuxAddNamedData() and WebPMuxGetNamedData() APIs. Add WebPMuxSetImage(), WebPmuxGetImage() and WebPMuxDeleteImage() APIs instead.
- Refactor code using WebPImage struct.
- Corresponding changes in webpmux binary.
- WebPMuxSetImage()/AddFrame()/AddTile() can now work with data which starts from "RIFF...". This simplifies reading a single-image webp file and adding it as an image/frame/tile in mux.
Change-Id: I7d98a6407dfe55c84a682ef7e46bc622f5a6f8d9
For odd-sized chunk-payload, there's one Byte padding at the end to make the
next chunk start at even-address. The chunk-skip logic needs to be updated to
handle such cases.
Change-Id: I8939ed07584a6195092fbe703eb0ea711fa5f153
Changed function signature of method WebPMuxCreate and few other minor nits.
Header file has been re-organised to have declaration of set/get/Delete
methods for different use-cases (Metadata, ColorProfile etc) in one place
instead of declaring all Set methods together followed by Get & Delete.
Change-Id: I52f6dffd216b1c343423d55a5b45fa1b9b9c1347
This change adds the WebP Mux library for manipulating the WebP Mux
Container. The library document and command line tool exhibiting the
usage of this libary will follow in subsequent Git change.
Change-Id: I4cba7dd12307483185ad5a68df33af6c36c154c8
- Move common defines to dec/webpi.h
- Regularize naming and parameters of various "CheckAndSkip" functions.
Also they return VP8StatusCode for clarity.
- Move WebP header/chunk parsing functions to webpi.h
- Fix a bug in static function GetFeatures()
Change-Id: Ibc3da4ba210d860551724dc40741959750d66b89
This has been pointed as a useful information to have in the header (for
the non VP8-specs savvy ones)
Change-Id: I494b1da41dfafce882a94e3677d1cd6206bc504b
CloseHandle returns non-zero on success so earlier versions would leave
'ok' with a misleading value, though the return itself was correct.
Change-Id: I21b74a59d90f7bf1b484a55f3960962e933f577b
Was getting compiler error when I included bit_writer.h from non libwebp
directory. bit_writer.h includes vp8enci.h and that uses VP8BitWriter without
having it's definition.
Change-Id: I1ca82594292979b9eb7e60e2fffb22c16768dd30
Gathers all DSP-related function (and SSE2 implementations).
Clean-up some unwanted symbolic dependencies so that webp_encode,
webp_decode and webp_dsp are truly independent libraries.
+ opportunistic clean-up:
* remove unneeded VP8DspInitTables(), now integrated in VP8DspInit()
* make consistent use of VP8GetCPUInfo() in the various DspInit() funcs
* change OUT macro to DST
uint8_t is a gcc extension which msvc similarly supports, but for
greater compatibility, and to match the change already made in
dec/vp8i.h, update the remaining bitfield to use unsigned int.
Change-Id: Id9dca470345871e00e82893255a306dfe5d3fa29
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
was missing from the RD-computation of intra-4x4 score.
Doesn't change anything significantly, it's just More Correct.
Change-Id: I25c5b53a810d97e6fb7f98c549fd23bbe55e1bf4
with assertions enabled the code would abort in
WebPWorkerChangeState with:
Assertion `worker->status_ >= OK'
without them the code would hang in the _cond_wait.
this change makes WebPWorkerChangeState a no-op in this case.
Change-Id: Iea855568bbdef2865ae61ab54473b3a7c230e91a
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
Add WEBP_EXTERN(type) macro which should make Windows DLL builds simpler
by allowing the signature to be changed.
Change-Id: I0cfa45dff779985680b1a38ddff30973a0d26639
RGB565 and ARGB4444 are only supported through the advanced decoding API.
ARGB being somewhat generic, there's an easy WebPDecodeARGB()
new function for convenience.
Patch by Vikas Arora (vikaas dot arora at gmail dot com)
Change-Id: Ic7b6f72bd70aca458d14e7fdd23679212430ebca
~5-10% faster.
Heavy 8bit arithmetic trickery!
Patch by Somnath Banerjee (somnath at google dot com)
Change-Id: I9fd2c511d9f631e9cf4b008c46127b49fb527b47
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
This is a temporary workaround for issue #80.
Currently dec/dsp_sse2 is not included in Makefile.vc. Simply adding it
will cause a build error, however, as cl does not support aligning
function parameters producing, e.g.,
src\dec\dsp_sse2.c(228) : error C2719: 'q1': formal parameter with
__declspec(align('16')) won't be aligned
Change-Id: Id29e6802dd29110e59c4f6d13ffa5d4793c750a0
There was 1 unneeded sample line allocated for the filter cache in of simple filtering.
+ Add an explaining comment.
Change-Id: I775a596c8b8643e773e0eade8aa341dc23fb290f
Only builds with --enable-experimental require zlib currently.
A base install of mingw will not include the development headers and
library. libwebp itself will now build in such environments.
Additionally, remove -lz from **/Makefile.am, -lz will be added to LIBS
by AC_CHECK_LIB when necessary.
Change-Id: Iae8319cdf00162ecb7ed44661c02f40beb34f155
Use _MSC_VER as the intrinsics compile without /arch:SSE2 on x86.
Also avoids applying the same flag to all files which defeated the
purpose of the runtime cpu-detection.
Thanks to Frank B. for the suggestion!
Change-Id: Iae9933a3cee704e663d9bbd53d0fa68e8c025425
picture->error_code can be looked up for finer error diagnose.
Added readable error messages to cwebp too.
Should close bug #75 (http://code.google.com/p/webp/issues/detail?id=75)
Change-Id: I8889d06642d90702f698cd5c27441a058ddb3636
sometimes, gcc insert sse2 storeu instructions (like in VP8InitFilter())
with aligment requirements.
Bug was visible 'sometimes' in non-debug mode, when trying to use -af.
Change-Id: If3ec282bbbb9f9d0d33ca4b2c4bed46cd26fe495
we were reading past the end of the dqs[] array.
reported by Mathias Schindler (on cygwin only)
http://code.google.com/p/webp/issues/detail?id=71
Change-Id: Ib38c4c139e3cac3e8915626d63e16b403d6bbd63
+ add a simple rescaling function: WebPPictureRescale() for encoding
+ clean-up the memory managment around the alpha plane
+ fix some includes path by using "../webp/xxx.h" instead of "webp/xxx.h"
New flags for 'cwebp':
-resize <width> <height>
-444 (no effect)
-422 (no effect)
-400
Change-Id: I25a95f901493f939c2dd789e658493b83bd1abfa
This is a (minor) bitstream change: if the 'color_space' bit is set to '1'
(which is normally an undefined/invalid behaviour), we add extra data at the
end of partition #0 (so-called 'extensions')
Namely, we add the size of the extension data as 3 bytes (little-endian),
followed by a set of bits telling which extensions we're incorporating.
The data then _preceeds_ this trailing tags.
This is all experimental, and you'll need to have
'#define WEBP_EXPERIMENTAL_FEATURES' in webp/types.h to enable this code
(at your own risk! :))
Still, this hack produces almost-valid WebP file for decoders that don't
check this color_space bit. In particular, previous 'dwebp' (and for instance
Chrome) will recognize this files and decode them, but without the alpha
of course. Other decoder will just see random extra stuff at the end of
partition #0.
To experiment with the alpha-channel, you need to compile on Unix platform
and use PNGs for input/output.
If 'alpha.png' is a source with alpha channel, then you can try (on Unix):
cwebp alpha.png -o alpha.webp
dwebp alpha.webp -o test.png
cwebp now has a '-noalpha' flag to ignore any alpha information from the
source, if present.
More hacking and experimenting welcome!
Change-Id: I3c7b1fd8411c9e7a9f77690e898479ad85c52f3e
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
to return the sum directly.
output is bitwise the same, speed up 1-2%. This is preparatory to a
more efficient SSE2 implementation.
Change-Id: I0bcdf05808c93420fbe9dcb75e5e7e55a4ae5b89
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
going down to strict -ansi c89 is quite overkill (no 'inline',
and /* */-style comments).
But with these fixes, the code compiles with the stringent flags:
-Wextra -Wold-style-definition -Wmissing-prototypes
-Wmissing-declarations and -Wdeclaration-after-statement
Change-Id: I36222f8f505bcba3d9d1309ad98b5ccb04ec17e3
WebPGetDecoderVersion() and WebPGetEncoderVersion()
will not return 0.1.2 encoded as 0x000102
dwebp and cwebp also have a new "-version" flag
Change-Id: I4fb4b5a8fc4e53681a386ff4b74fffb639fa237a
The object WebPIDecoder is available to store the
decoding state. The flow is typically:
WebPIDecoder* const idec = WebPINew(mode);
while (has_more_data) {
// ... (get additional data)
status = WebPIAppend(idec, new_data, new_data_size);
if (status != VP8_STATUS_SUSPENDED ||
break;
}
// The above call decodes the current available buffer.
// Part of the image can now be refreshed by calling to
// WebPIDecGetRGB()/WebPIDecGetYUV() etc.
}
WebPIDelete(idec);
Doing so, one can try and decode new macroblocks everytime fresh
bytes are available.
There's two operating modes: either appending fresh bytes, or
updating the whole buffer with additional data in the end.
The latter requires less memcpy()'s
main patch by Somnath Banerjee (somnath at google.com)
Change-Id: Ie81cbd0b50f175743af06b1f964de838b9a10a4a
use top_srcdir rather than top_builddir for AM_CPPFLAGS
add EXTRA_DIST to man Makefile. fixes distcheck target.
Change-Id: I308dc1c98f096de1efe188f63d040ef953598e78
non-zero dc-bit was mixed with non-zero ac-bit, preventing
finer optimization during VP8ReconstructBlock.
Depending on sparsity, i see 2-5% gain on average.
Change-Id: I7f34f18d0701c77837de3540b732e5b7d85d7c5d
(this makes initialization easier and will be helpful for incremental
decoding).
Modify ParsePartitions() to accommodate for truncated input.
Change-Id: I62f52078d6b7a2314a11880a20d9eac5b4714bd0
libvpx (and ffvp8) implementations are completely skipping the deblocking
step if loop_filter_level is 0, which is _not_ equivalent to performing
the loop-filtering with a 0 value for loop_filter_level. In the latter case
(which we followed), few pixels were modified here and there and you could
observe off-by-1 errors on few places.
This patch will reconcile the 3 implementations (since the difference
is minor, skipping the deblocking step will save CPU for virtually
no visible difference).
The spec will be made clearer about the expected behaviour:
* if the global loop_filter_level is 0, turn deblocking off.
* if it's not 0 but the local loop_filter_level ends up being 0 for whatever
reason (lf_delta, mode delta, ref delta, etc.) on a particular
macroblock, skip the deblocking too.
Change-Id: I157f1f8de463b8a76caddb3f347b7fbc7bd527d2
This will make the decoder skip the filtering process if needed,
resulting in speed-up, but also non-compliant (blocky?) output
+ Add a versioning check for VP8InitIo(), since we've adding a field to VP8Io
+ add some more error checks while at it
Change-Id: I4e9899edc24ecf8600cbb27aa4038490b7b2cef3
we'll always encode using absolute value, not relative ones.
Both methods use the same number of bits, so we'll go for the
simpler and most robust one.
+ add some extra checks about pic->u/v being NULL.
Change-Id: I98ea01a1a6b133ab3c816c0fbc50e18269bd2098
converts PNG & JPEG to WebP
This is an experimental early version, with lot of room
of later optimizations in both speed and quality.
Compile with the usual `./configure && make`
Command line example is examples/cwebp
Usage:
cwebp [options] -q quality input.png -o output.webp
where 'quality' is between 0 (poor) to 100 (very good).
Typical value is around 80.
More encoding options with 'cwebp -longhelp'
Change-Id: I577a94f6f622a0c44bdfa9daf1086ace89d45539
For very very short partitions, the initial GetByte() could
set eof_ to 1, whereas some bits were available but unread yet.
So we set eof_ to 0 last.
Change-Id: Ic6b68271bc72efa4de4e64e1f57307d1d8fb613c
by processing two rows at a time.
The [9 3 3 1] weights are decomposed as
[1 1 1 1] + [0 2 2 0] + [8 0 0 0] for better
reuse of sub-expressions, too.
Change-Id: I87ab549048ed249d38add73bb3241dfa0c583328
We only need to know _if_ there's some non-zero coeffs at all,
not the exact number of these.
+ code-style nits clean-up
Change-Id: Ice9acf00aef999d70affe4629cb56ae7709140ab
just flushing the pile:
- get rid of Put4 in dsp.c
- move LD4 enum value
- move more fields and code under the ONLY_KEYFRAME_CODE compile flag
- update test_ref.ppm reference (now with FANCY_UPSCALER)
- simplify VP8GetSignedValue()
- use HE and VE naming for prediction mode instead of H and V
- some missing c89 fixes
- code style nits
all test vectors still passing
not super-elegant, but should work without
having to go into deeper hacking (like: creating
an endian.h file, etc.)
Change-Id: I43100ec67a22393c87e11357078efffc750060f5
When FANCY_UPSCALING is defined, use a smoothing filter for upscaling
the U/V chroma fields. The filter used is a separable t[1 3 3 1] x [1 3 3 1]
filter. It can be easily changed in macros MIX_*.
The upscaling code reside on the thing shell between user and core
decoding (in webp.c), and not in the core decoder. As such, this smoothing
process can still be offloaded to GPU in some future and is not integral
part of the decoding process.
Coincidentaly: changed the way data is tranfered to user. For profile 2 (no
filtering), it used to be on a per-block basis. Now, for all profiles, we
emit rows of pixels (between 8 and 24 in height) when they are ready.
This makes the upscaling code much easier.
Will update the test vectors MD5 sums soon (as they'll be broken
after this change)
Change-Id: I2640ff12596cb8b843a4a376d7347447d9b9f778
