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Container spec: clarify ordering of ALPH chunk.

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Reported by user: https://code.google.com/p/webp/issues/detail?id=255

Change-Id: I9c027ea828d5a367b317744fad7607a16ed52fa5
This commit is contained in:
Urvang Joshi 2015-07-22 11:55:49 -07:00
parent 01d61fd9c6
commit 585d93dbba
1 changed files with 9 additions and 3 deletions
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12
doc/webp-container-spec.txt
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@ -271,9 +271,15 @@ An extended format file consists of:
* An optional list of [unknown chunks](#unknown-chunks). _\[status: experimental\]_
For a _still image_, the _image data_ consists of a single frame, whereas for
an _animated image_, it consists of multiple frames. More details about frames
can be found in the [Animation](#animation) section.
For a _still image_, the _image data_ consists of a single frame, which is made
up of:
* An optional [alpha subchunk](#alpha).
* A [bitstream subchunk](#bitstream-vp8vp8l).
For an _animated image_, the _image data_ consists of multiple frames. More
details about frames can be found in the [Animation](#animation) section.
All chunks SHOULD be placed in the same order as listed above. If a chunk
appears in the wrong place, the file is invalid, but readers MAY parse the