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Update lossless spec for two simple codes.

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Bug: webp:611
Change-Id: If628bb9332ebca6dd11b3561c3458e0f43ed54a3
This commit is contained in:
Vincent Rabaud 2023-09-14 09:43:31 +02:00
parent ac17ffffcb
commit accd141da3
1 changed files with 3 additions and 0 deletions
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3
doc/webp-lossless-bitstream-spec.txt
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@ -888,6 +888,9 @@ if (num_symbols == 2) {
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The two symbols should be different. Duplicate symbols are allowed, but
inefficient.
**Note:** Another special case is when _all_ prefix code lengths are _zeros_ (an
empty prefix code). For example, a prefix code for distance can be empty if
there are no backward references. Similarly, prefix codes for alpha, red, and