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webp-container-spec.txt: make reserved 0 values a MUST
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
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@ -322,7 +322,7 @@ Extended WebP file header:
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Reserved (Rsv): 2 bits
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: SHOULD be `0`.
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: MUST be `0`.
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ICC profile (I): 1 bit
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@ -348,11 +348,11 @@ Animation (A): 1 bit
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Reserved (R): 1 bit
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: SHOULD be `0`.
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: MUST be `0`.
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Reserved: 24 bits
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: SHOULD be `0`.
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: MUST be `0`.
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Canvas Width Minus One: 24 bits
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@ -466,7 +466,7 @@ Frame Duration: 24 bits (_uint24_)
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Reserved: 6 bits
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: SHOULD be 0.
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: MUST be 0.
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Blending method (B): 1 bit
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@ -546,7 +546,7 @@ _padded_ chunks as described by the [RIFF file format](#riff-file-format).
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Reserved (Rsv): 2 bits
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: SHOULD be `0`.
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: MUST be `0`.
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Pre-processing (P): 2 bits
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