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webp-lossless-bitstream-spec: add missing bits to ABNF

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alpha-is-used and the version number were missing before 'image-stream'

spotted by thakis@

Change-Id: I7a4f1d2e0f0962bb1a79a0400c229738159d88a5
This commit is contained in:
James Zern 2023-04-11 18:59:04 -07:00
parent 93d88aa25b
commit 84d04c4845
1 changed files with 7 additions and 4 deletions
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doc/webp-lossless-bitstream-spec.txt
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@ -1065,10 +1065,13 @@ number of pixels (xsize * ysize).
#### 7.1 Basic Structure
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
format = RIFF-header image-size image-stream
RIFF-header = "RIFF" 4OCTET "WEBP" "VP8L" 4OCTET %x2F
image-size = 14BIT 14BIT ; width - 1, height - 1
image-stream = optional-transform spatially-coded-image
format = RIFF-header image-header image-stream
RIFF-header = "RIFF" 4OCTET "WEBP" "VP8L" 4OCTET %x2F
image-header = image-size alpha-is-used version
image-size = 14BIT 14BIT ; width - 1, height - 1
alpha-is-used = 1BIT
version = 3BIT ; 0
image-stream = optional-transform spatially-coded-image
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~