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webp-container-spec.txt: make reserved 0 values a MUST

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these were intended as an extension point, but in this version of the
spec they're not defined. if they ever were used leaving them as SHOULD
could result in a source of incompatibility.

Change-Id: I1376ab7abe7d955ae335106f2faebc217dac77cd
This commit is contained in:
James Zern 2022-08-02 15:14:11 -07:00
parent bd9391232d
commit 5b87983ad0
1 changed files with 5 additions and 5 deletions
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10
doc/webp-container-spec.txt
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@ -322,7 +322,7 @@ Extended WebP file header:
Reserved (Rsv): 2 bits Reserved (Rsv): 2 bits
: SHOULD be `0`. : MUST be `0`.
ICC profile (I): 1 bit ICC profile (I): 1 bit
@ -348,11 +348,11 @@ Animation (A): 1 bit
Reserved (R): 1 bit Reserved (R): 1 bit
: SHOULD be `0`. : MUST be `0`.
Reserved: 24 bits Reserved: 24 bits
: SHOULD be `0`. : MUST be `0`.
Canvas Width Minus One: 24 bits Canvas Width Minus One: 24 bits
@ -466,7 +466,7 @@ Frame Duration: 24 bits (_uint24_)
Reserved: 6 bits Reserved: 6 bits
: SHOULD be 0. : MUST be 0.
Blending method (B): 1 bit Blending method (B): 1 bit
@ -546,7 +546,7 @@ _padded_ chunks as described by the [RIFF file format](#riff-file-format).
Reserved (Rsv): 2 bits Reserved (Rsv): 2 bits
: SHOULD be `0`. : MUST be `0`.
Pre-processing (P): 2 bits Pre-processing (P): 2 bits