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Urvang Joshi 7f8472a610 Update the WebP Container Spec. 
- Add details about the VP8L chunk support.
- Also add new example bitsteams containing VP8L chunk.
- Add back a section describing the VP8 chunk.
- Restrict some fields to 16 or 24 bits instead of 32 bits.
- Fields whose values are always positive are stored 1-based
instead of 0-based.
- Unknown chunks can only occur at certain places in the file.
- Remove the restriction for some fields to be divisible by 32 or 16.
  Instead they are restricted to be even.
- Add a restriction for (canvas_width * canvas_height) product.
- Add 3 bits for rotation & symmetry in VP8X flags.
- Add some new example layouts.
- Add/clarify some nitty-gritties throughout the doc.
- Use the terms frame/tile more consistently and logically.
- Update related TODOs.

Change-Id: I611c1f58ecc3ee87546ca31bad1609376fad251e
2012-06-21 16:04:58 -07:00
..
README Add kramdown version information to README 2012-06-20 14:17:36 -07:00
template.html Lossless WebP doc largely ported to markdown text. 2012-06-15 14:52:57 -07:00
TODO Update the WebP Container Spec. 2012-06-21 16:04:58 -07:00
webp-container-spec.txt Update the WebP Container Spec. 2012-06-21 16:04:58 -07:00
webp-lossless-bitstream-spec.txt Edit for consistency, usage and grammar. 2012-06-20 10:08:53 -07:00
webp-lossless-format-spec.pdf doc: update lossless pdf 2012-06-04 16:53:16 -07:00

README 

Generate libwebp Container Spec Docs from Text Source
=====================================================

HTML generation requires kramdown [1], easily installed as a
rubygem [2].  Rubygems installation should satisfy dependencies
automatically.

[1]: http://kramdown.rubyforge.org/
[2]: http://rubygems.org/

HTML generation can then be done from the project root:

$ kramdown doc/webp-container-spec.txt --template doc/template.html > \
  doc/output/webp-container-spec.html

kramdown can optionally syntax highlight code blocks, using CodeRay [3],
a dependency of kramdown that rubygems will install automatically.  The
following will apply inline CSS styling; an external stylesheet is not
needed.

$ kramdown doc/webp-lossless-bitstream-spec.txt --template \
  doc/template.html --coderay-css style --coderay-line-numbers ' ' \
  --coderay-default-lang c > \
  doc/output/webp-lossless-bitstream-spec.html

Optimally, use kramdown 0.13.7 or newer if syntax highlighting desired.

[3]: http://coderay.rubychan.de/