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webp-lossless-bitstream-spec: split Meta Prefix Codes section

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Make Entropy Image and Interpretation of Meta Prefix Codes their own
section for ease of reference.

Bug: webp:611
Change-Id: I2dba7b4efd02d8bb250810ebff42ac1687262804
This commit is contained in:
James Zern 2023-06-22 17:28:02 -07:00
parent 7b634d8f0c
commit 7f1b6799db
1 changed files with 2 additions and 2 deletions
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doc/webp-lossless-bitstream-spec.txt
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@ -963,7 +963,7 @@ value:
* If this bit is one, the image uses multiple meta prefix codes. These meta * If this bit is one, the image uses multiple meta prefix codes. These meta
prefix codes are stored as an _entropy image_ (described below). prefix codes are stored as an _entropy image_ (described below).
**Entropy image:** ##### Entropy Image
The entropy image defines which prefix codes are used in different parts of the The entropy image defines which prefix codes are used in different parts of the
image. image.
@ -982,7 +982,7 @@ where `DIV_ROUND_UP` is as defined [earlier](#predictor-transform).
The next bits contain an entropy image of width `prefix_xsize` and height The next bits contain an entropy image of width `prefix_xsize` and height
`prefix_ysize`. `prefix_ysize`.
**Interpretation of Meta Prefix Codes:** ##### Interpretation of Meta Prefix Codes
The number of prefix code groups in the ARGB image can be obtained by finding The number of prefix code groups in the ARGB image can be obtained by finding
the _largest meta prefix code_ from the entropy image: the _largest meta prefix code_ from the entropy image: