Commit Graph

75 Commits

Author SHA1 Message Date
James Zern
24a9693223 dec: allow 0 as a scaling dimension
this allows scaling to a particular width/height while preserving the
source aspect ratio using WebPRescalerGetScaledDimensions().

Change-Id: I77b11528753290c1e9bb942ac761c215ccfb8701
2015-08-13 20:58:17 -07:00
Pascal Massimino
257adfb0be remove experimental YUV444 YUV422 and YUV400 code
(never used)

Change-Id: I12a886703592133939607df05132e9b498f916c1
2014-07-03 22:26:25 -07:00
Urvang Joshi
1684f4ee37 WebP Decoder: Mark some truncated bitstreams as invalid
Specifically, check for truncated RIFF and/or VP8(L) chunks.

For more context, see:
https://code.google.com/p/webp/issues/detail?id=185

Change-Id: I91ca2dbf05080660fbc513244fc53adc57fc04b5
2014-02-10 16:35:27 -08:00
skal
5da185522b add a decoding option to flip image vertically
New API options: WebPDecoderOptions.flip and 'dwebp -flip ...'

it uses negative stride trick.

Also changed the decoder code to support user-supplied
buffers with negative stride, independently of the
WebPDecoderOptions.flip value.

Change-Id: I4dc0d06f0c87e51a3f3428be4fee2d6b5ad76053
2014-01-16 15:48:43 +01:00
James Zern
f7fc4bc89b dec/webp.c: don't wait for data before reporting w/h
this partially reverts
f626fe2 Detect canvas and image size mismatch in decoder.

the original change would cause calls to e.g., WebPGetInfo to fail until
a portion of the image chunk was available. With lossy+alpha this meant
waiting for the entire ALPH chunk to be received.
this change restores the original behavior -- reporting the values from
VP8X if available -- while retaining some of the added canvas/image size
checks if the image data is available

Change-Id: I6295b00a2e2d0d4d8847371756af347e4a80bc0e
2013-12-18 17:09:04 -08:00
James Zern
5227d99146 drop: ifdef __cplusplus checks from C files
the prototypes are already marked in the headers

Change-Id: I172fe742200c939ca32a70a2299809b8baf9b094
2013-12-13 11:42:13 -08:00
skal
cbdd3e6e53 add a -dither dithering option to the decoder
Even at high quality setting, the U/V quantizer step is limited
to 4 which can lead to banding on gradient.
This option allows to selectively apply some randomness to
potentially flattened-out U/V blocks and attenuate the banding.

This option is off by default in 'dwebp', but set to -dither 50
by default in 'vwebp'.

Note: depending on the number of blocks selectively dithered,
we can have up to a 10% slow-down in decoding speed it seems.

Change-Id: Icc2446007f33ddacb60b3a80a9e63f2d5ad162de
2013-11-27 00:57:51 -08:00
Pascal Massimino
86c0031eb2 add a 'format' field to WebPBitstreamFeatures
Change-Id: I79a688e4c34fb77527127bbdf4bc844efa6aa9a4
2013-10-25 20:34:06 +02:00
skal
8a2fa099cc Add a second multi-thread method
method 1 grouping: [parse + reconstruction] // [filtering + output]
method 2 grouping: [parse] // [reconstruction+filtering + output]

Depending on some heuristics (see VP8ThreadMethod()), we
can pick one of the other when -mt flag (or option.use_threads)
is selected.

Conservatively, we always use method #2 for now until the heuristic
is refined (so, timing should be the same the before this patch)

+ replace 'use_threads' by 'mt_method'
+ define MIN_WIDTH_FOR_THREADS constant
+ fix comment alignment

Change-Id: I11a756dea9070d6e21b1a9481d357a1e8aa0663e
2013-10-15 23:58:31 +02:00
Urvang Joshi
6df743a33e Decoder: handle fragments case correctly too.
Exit early from ParseHeaderInternal() in case of fragmented image too.

Change-Id: I3e24be2c869cc2d87c43b705257f21be81127dbd
2013-07-18 19:23:57 -07:00
Pascal Massimino
f626fe2e9f Detect canvas and image size mismatch in decoder.
Will probably have to be re-visited when FRGM are
switched on.

Change-Id: I51c15e4c3887ab8f04d92ec783deca274cd09f41
2013-07-02 16:19:08 -07:00
James Zern
d640614d54 update copyright text
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
2013-06-06 23:09:14 -07:00
Pascal Massimino
1579989e7b Fix few missing comparisons to NULL
Change-Id: I0d2ff8e8b507d17e80669b2b59fd5b017af995ed
2013-04-13 10:36:33 -07:00
Urvang Joshi
ead4d47859 Add incremental support for extended format files
This applies to images with optional chunks (e.g. images with ALPH
chunk,
ICCP chunk etc). Before this, the incremental decoding used to work like
non-incremental decoding for such files, that is, no rows were decoded
until
all data was available.

The change is in 2 parts:
- During optional chunk parsing, don't wait for the full VP8/VP8L chunk.
- Remap 'alpha_data' pointer whenever a new buffer is allocated/used in
WebPIAppend() and WebPIUpdate().

Change-Id: I6cfd6ca1f334b9c6610fcbf662cd85fa494f2a91
2013-04-08 14:29:14 -07:00
James Zern
302efcdb41 Decode: return more meaningful error for animation
VP8_STATUS_NOT_ENOUGH_DATA -> VP8_STATUS_UNSUPPORTED_FEATURE

Change-Id: If5ee9fd2c99fc5502996d3c786848fd9cc118fe7
2013-03-20 13:59:22 -07:00
James Zern
ad452735c3 WebPBitstreamFeatures: add has_animation field
Change-Id: I3e181ce463b0e4833bfd29f8052b21ebe0bca977
2013-03-20 13:49:56 -07:00
James Zern
f933fd2a27 move WebPFeatureFlags declaration
from private format_constants.h to public mux_types.h
also do the reverse for MKFOURCC()

Change-Id: I3aa86b007e9dbfed37a170989164ac3a77de2bd5
2013-03-19 16:10:41 -07:00
Urvang Joshi
956b217a8b WebPGetFeatures() behavior change:
It should return VP8_STATUS_NOT_ENOUGH_DATA when it doesn't have enough
data.

Change-Id: I5acff04f9ba51dab150dc6d137c5ad00ea61c64a
2013-02-27 15:27:43 -08:00
Urvang Joshi
23782f95b4 Separate out mux and demux code and libraries:
- Separate out mux.h and demux.h
- muxtypes.h: new header for data types common to mux/demux
- Move some misc read/write utilities to utils/utils.h
- Remove some duplicate methods.
- Separate out mux/demux libraries

Change-Id: If9b9569b10d55d922ad9317ef51710544315d6de
2012-11-19 11:40:18 -08:00
Urvang Joshi
a00a3daf5b Use 'frgm' instead of 'tile' in webpmux parameters
- Also, use the term 'fragments' instead of 'tiling' in code
- This makes code consistent with the spec.

Change-Id: Ibeccffc35db23bbedb88cc5e18e29e51621931f8
2012-11-06 16:09:10 -08:00
Urvang Joshi
f903cbab9a Chunk fourCCs for XMP/EXIF
Use separate fourCCs "XMP " and "EXIF" instead of a common "META"
Also, some refactorization in webpmux.c

Change-Id: Iad3337e5c1b81e785c60670ce28b1f536dd7ee31
2012-11-06 14:53:21 -08:00
James Zern
30763333f3 libwebp: validate chunk size in ParseOptionalChunks
the max wasn't checked leading to a rollover case, possibly exploitable.
additionally check the RIFF size early, to avoid similar issues.

pulled from chromium:
 http://codereview.chromium.org/11229048/

Change-Id: Ifebc712bf3d3de0129b76ca4c57c68e062abc429
2012-10-22 21:57:59 -07:00
Pascal Massimino
f7f16a2976 add ABI compatibility check
minor revision shouldn't matter, we only check major revision number.
Bumped all version numbers so that incompatibility starts *now*

Change-Id: Id06c20f03039845ae4cfb3fd121807b931d67ee4
2012-07-18 11:53:25 -07:00
James Zern
9838e5d5ff decode.h: remove '* const' from function parameters
makes the public interface consistent and more readable

Change-Id: I067eb5ecc1094216ef6aecc65f636f69873de8f9
2012-07-17 15:48:00 -07:00
Pascal Massimino
0fa844fb8f cosmetic fixes on assert and 'const' where applicable
Change-Id: Iede15b8464be453e7d12929513ed82183921265c
2012-07-03 05:50:36 -07:00
Pascal Massimino
7f22bd2596 check limit of width * height is 32 bits
Update the RIFF-specs file too

Change-Id: I113a7e25da2f7a19c1344c1dc5d496127cfe2596
2012-07-03 05:42:13 -07:00
Urvang Joshi
3ba81bbe8b WebP Decoding error handling:
- Don't allow any extended chunks (except ALPH) without RIFF & VP8X
chunks.
- Also, don't allow VP8X without RIFF.

Change-Id: I1beba43e617ec637901aeeb93f2f484ec086a75d
2012-06-29 14:32:21 +05:30
Pascal Massimino
e012dfd90f make width/height coding match the spec
* width/height in VP8X chunk is 24bit now
* Added some more constants #defines

Change-Id: I2f8ca7f965a247bccd341dd079ed2abf549c39d7
2012-06-28 00:20:28 -07:00
James Zern
2f66668882 Merge "modify WebPParseHeaders to allow reuse by GetFeatures" 2012-06-12 23:51:55 -07:00
James Zern
fb4943bdf9 modify WebPParseHeaders to allow reuse by GetFeatures
moves the implementation to ParseHeadersInternal. this also allows
decoding to start at a VP8X sub-chunk, e.g. 'ALPH'.

Change-Id: I06791f87d90f888de32746ecb02705e4b0ff227a
2012-06-08 14:55:14 -07:00
Vikas Arora
eaee9e79f7 Bug-Fix: Decode small (less than 32 bytes) images.
ParseVP8X was checking for presence of extra 20 bytes (after RIFF header).
This check should not be executed for non-mux (non-VP8X) images.

Change-Id: I3fc89fa098ac0a53102e7bbf6c291269817c8e47
2012-06-08 14:30:56 +05:30
Pascal Massimino
b4e6645c61 Merge "add colorspace for premultiplied alpha" 2012-06-04 07:56:37 -07:00
Pascal Massimino
48f827574e add colorspace for premultiplied alpha
The new modes are
       MODE_rgbA
       MODE_bgrA
       MODE_Argb
       MODE_rgbA_4444
It's binary incompatible, since the enums changed.

While at it, i removed the now unneeded KeepAlpha methods.
-> Saved ~12k of code!

* made explicit mention that alpha_plane is persistent,
so we have access to the full alpha plane data at all time.
Incremental decoding of alpha was planned for, but not
implemented. So better not dragged this constaint for now
and make the code easier until we revisit that.

Change-Id: Idaba281a6ca819965ca062d1c23329f36d90c7ff
2012-06-04 07:50:41 -07:00
Vikas Arora
069f903a08 Change in lossless bit-stream.
Change the lossless signature to 0x2f
Add 1 bit indicator for 'droppable (or trivial) alpha)'.
Add 3 bit lossless version (for future extension like yuv support).
Change the sub-resolution information to 3 bits implying range [2 .. 9]

Change-Id: Ic7b8c069240bbcd326cf5d5d4cd2dde8667851e2
2012-06-04 12:47:01 +05:30
Urvang Joshi
9ef3228301 Add support for raw lossless bitstream in decoder.
Previously, it used to assume any raw bitstream is a VP8 one.

Also,
- Factor out VP8CheckSignature() & VP8LCheckSignature().
- Use a local var for *data_ptr in ParseVP8Header() for
readability.

Change-Id: I0fa8aa177dad7865e00c8898f7e7ce76a9db19d5
2012-05-31 14:03:17 +05:30
Urvang Joshi
c13f663261 Move consts to internal header format_constants.h
Change-Id: Ic6180c16d0b4245680738992925e4608c593fbe8
2012-05-24 15:02:02 +05:30
Urvang Joshi
a107dfa806 Rectify WebPParseOptionalChunks().
Now it stops at either VP8/VP8L chunk.

Change-Id: Iadac4fa47396b61b9b720b8b7b19138c89df24cc
2012-05-23 13:59:52 +05:30
James Zern
9b3d1f3a1b decode.h: use size_t consistently
replaces mixed use of int/uint32_t for buffer sizes
further changes the API/ABI.

Change-Id: I91d70fd82ee3e1ac34b884b8ead9a114a9b1015a
2012-04-19 14:31:31 -07:00
Pascal Massimino
6860c2ea9d fix some uint32_t -> size_t typing
Change-Id: I078243802a67498dfcd3d15b5f1bebf4b6b3b1bb
2012-04-11 04:27:45 -07:00
Pascal Massimino
6f01b830e2 split the VP8 and VP8L decoding properly
* 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
2012-04-10 23:06:58 -07:00
James Zern
f2623dbe58 enable lossless decoder
import changes from experimental 5529a2e^
and enable build in autoconf and makefile.unix; windows will be treated
separately.

Change-Id: Ie2e177a99db63190b4cd647b3edee3b4e13719e9
2012-04-10 23:06:36 -07:00
Pascal Massimino
1db888ba40 take colorspace into account when cropping
(cherry picked from commit 4e33653b52637c74ae30adde7990265d1d43994b)

Conflicts:

	src/dec/vp8l.c
2012-03-30 12:48:24 -07:00
Pascal Massimino
61c2d51fd7 move the rescaling code into its own file and make enc/ and dec/ use it.
(cherry picked from commit 8e92d9e380a89b7443a2e2c3d16ce5a222e8c1e8)

Conflicts:

	Android.mk
	makefile.unix
	src/dec/vp8l.c
	src/utils/Makefile.am
2012-03-30 12:16:25 -07:00
Urvang Joshi
efc2016a31 Make rescaler methods generic
to be used in rescaling of lossless bitstreams.
(cherry picked from commit 2e12a3045498b6faf13b93bc25391e8226119f0a)
2012-03-30 11:57:07 -07:00
Urvang Joshi
3eacee8158 Move rescaler methods out of io.c.
(cherry picked from commit b5e9db1824f6efbe0bfb87e94b8d6e88a7973ef7)
2012-03-30 11:56:51 -07:00
James Zern
1601a39b09 silence some type size related warnings
size_t/ptrdiff_t -> uint32_t

Change-Id: Ic4d889b9239752311b9ed906c83076829d850874
2012-02-09 13:00:09 -08:00
Pascal Massimino
378086bd0a misc cosmetics
Change-Id: Iafc73f9fece13b5ca900a8b9c1039268872a181b
2012-01-22 23:20:53 -08:00
Pascal Massimino
f0d2c7a76f pass of cosmetics
Change-Id: Id031221b7499e8cfc460c873d0f8124c9bef3aa3
2012-01-17 18:32:27 -08:00
James Zern
ad1e163a0d cosmetics: normalize copyright headers
Change-Id: I5e2462b101e0447a4f15a1455c07131bc97a52dd
2012-01-06 14:49:06 -08:00
Pascal Massimino
f62d2c9497 remove unused 'has_alpha' from VP8GetInfo() signature
alpha information is not to be found at RIFF chunks level, not
in the VP8 bitstream (that was a tmp hack)

Change-Id: Idd1629c696b03c26f6f30650d7216f627f1761df
2011-12-08 06:41:40 -08:00