... since no guarantee of Huffman coding can be introduced at decoding
time and encoding didn't actually use Huffman coding in the first place
Bug: webp:551
Change-Id: I400466bb3b4a1d5506353eb3f287d658603164ee
for recent changes to color transform, simple code length code, image
structure and details of decoding prefix codes
Bug: webp:551
Change-Id: I36a4d1ee3e25b8a56f5d926f4770374ace99bc2f
and the corresponding InverseTransform(); the operations were swapped.
The forward transform subtracts the deltas, the inverse adds them.
Bug: webp:551
Change-Id: Ieb90a24f843cee7cdfe46cbb15ec7d716ca9d269
the value of the TR-pixel on the right border is the leftmost pixel on
the current row, not the previous one
Bug: webp:551
Change-Id: I157e8c16ce43a9f52c36aa880be1be3bef19c063
Break the main README into into multiple pages in the doc/ directory,
except for the tests, swig and webp_js docs which are in the corresponding
directories.
The webp mux doc is merged into the API doc and the tools doc.
Change-Id: Ia407617dd88094f4662841d37947cfef80799914
- prefer Exif to EXIF when not referring to the chunk
- normalize use of code format for canvas / frame width & height
Change-Id: I7fc9e87baeb5d8e719274680ce621dcb078a985f
- prefer https
- metadataworkinggroup.org/com seem to be offline; the web archive link
was obtained from exiftool: https://exiftool.org/TagNames/MWG.html
- fix kramdown link, rubyforge has been gone a long time
- fix png/zlib links
Bug: webp:544
Bug: b/202302177
Change-Id: Id69de4553e7baf00393f12a2c1acb262443a1a93
to https://datatracker.ietf.org/doc/html/... the http tools.ietf.org
links redirect here sometimes, in other cases they 404.
Bug: webp:544
Change-Id: I900972070d6c5659c45a86a89e78b870f42fe5bc
unknown chunks as a group are well defined in the text
+ remove the Note about stable features as it matched the list given;
there are no WIP features for the format
Change-Id: I11a4de39f9d203b815879f0e9dea9c45b2ae6ff6
replace with more inclusive terms or remove the comment entirely if the
meaning was already clear.
Bug: webp:507
Change-Id: Ica3bbf751ebf79f6668df6e6209af770248ff4ca
the interpretation of a 0 duration depends on the implementation;
merging of multiple frames isn't guaranteed, some may enforce a minimum
duration.
BUG=webp:380
Change-Id: Idf592049d2092e4cc5cfb2e4c59ddbc91bd52f9c
partially normalize indent, vertical whitespace and capitalization with
the copy used on developers.google.com/speed/webp
Change-Id: I8044418eeb9eaf5bd5c799675c74f6f845d503d6
at the beginning of the loop there's an implicit clear of the entire
canvas to the background (or application defined) color. this avoids
adding the final composited frame to the first.
Change-Id: Ia3a52cf4482c6176334a5c9c99a0ddd07d1776e7
Marking certain frames as "do not blend" helps avoiding alpha-blending
at decode/render time.
It also helps inserting I-frames (frames which can be independently
decoded) into the animation.
Change-Id: Iaa222805db88d2f1c81104ce9d882e7c7ff8cfdb
- Add a note that disposal only applies to the frame rectangle
- Add the formula for alpha-blending.
- Note that alpha-blending would occur for the common rectangle
- Also note the case when both color profile and disposal are
present.
Change-Id: I214787dd64453edf3b0cdaff3951015281a32ee4
- Escape brackets for which kramdown was generating a warning.
Note: This only changes this source file; output HTML would look exactly
the same.
- Also write '5' in words ('five').
Change-Id: I472a03c090a12eb7520719ea463469b36a2736b9
- Clarify the BNF using 'Huffman code groups' and 'Huffman code group'.
- Introduce same terminology in 'Interpretation of meta Huffman codes'.
- Make explicit mention of what is the number of Huffman code groups,
number of Huffman codes and the relation between the two.
Change-Id: I07aa9b62c1d464cd25dc02ac1a68d338b575bdc2
- Rectify a few BNF descriptions
- Corrections in "Decoding Flow of Image Data" section:
1. The sequence in case of "S < 256" should be green, red, blue, alpha.
2. In case of "S >= 256 + 24", the index should be "S - (256 + 24)".
- Provide more description to clarify "Decoding Flow of Image Data" section.
- Some cosmetics: use '1's instead of '1, 2, 3...' sequence, as kramdown takes
care of sequencing.
Change-Id: I2b76caf72f67aae813522dc1a4115f8ec8ea6db7
The color transform block size is stored as 3 bits, not 4.
Fixed the description. The code snippet is already correct.
Change-Id: I830d848b54c121cb5426ca06853a3f1184fd9a31
The prediction block size is stored as 3 bits, not 4.
Fixed the description. The code snippet is already correct.
Change-Id: Iaa66a7e9817b58a2557c9a71c2231cc400b6ae4d
