dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2024-11-19 20:08:28 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge "webp-container-spec: normalize notes & unknown chunk link" into main

Browse Source
This commit is contained in:
James Zern 2024-09-30 18:16:05 +00:00 committed by Gerrit Code Review
commit 84b118c9c3
1 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
doc/webp-container-spec.txt
View File

@ -131,7 +131,7 @@ Chunk Payload: _Chunk Size_ bytes
: The data payload. If _Chunk Size_ is odd, a single padding byte -- which MUST : The data payload. If _Chunk Size_ is odd, a single padding byte -- which MUST
be `0` to conform with RIFF -- is added. be `0` to conform with RIFF -- is added.
**Note:** RIFF has a convention that all-uppercase chunk FourCCs are standard **Note**: RIFF has a convention that all-uppercase chunk FourCCs are standard
chunks that apply to any RIFF file format, while FourCCs specific to a file chunks that apply to any RIFF file format, while FourCCs specific to a file
format are all lowercase. WebP does not follow this convention. format are all lowercase. WebP does not follow this convention.
@ -220,7 +220,7 @@ use another conversion method, but visual results may differ among decoders.
Simple File Format (Lossless) Simple File Format (Lossless)
----------------------------- -----------------------------
**Note:** Older readers may not support files using the lossless format. **Note**: Older readers may not support files using the lossless format.
This layout SHOULD be used if the image requires _lossless_ encoding (with an This layout SHOULD be used if the image requires _lossless_ encoding (with an
optional transparency channel) and does not require advanced features provided optional transparency channel) and does not require advanced features provided
@ -262,7 +262,7 @@ and height of the canvas.
Extended File Format Extended File Format
-------------------- --------------------
**Note:** Older readers may not support files using the extended format. **Note**: Older readers may not support files using the extended format.
An extended format file consists of: An extended format file consists of:
@ -290,12 +290,12 @@ up of:
For an _animated image_, the _image data_ consists of multiple frames. More For an _animated image_, the _image data_ consists of multiple frames. More
details about frames can be found in the [Animation](#animation) section. details about frames can be found in the [Animation](#animation) section.
All chunks necessary for reconstruction and color correction, that is 'VP8X', All chunks necessary for reconstruction and color correction, that is, 'VP8X',
'ICCP', 'ANIM', 'ANMF', 'ALPH', 'VP8 ' and 'VP8L', MUST appear in the order 'ICCP', 'ANIM', 'ANMF', 'ALPH', 'VP8 ', and 'VP8L', MUST appear in the order
described earlier. Readers SHOULD fail when chunks necessary for reconstruction described earlier. Readers SHOULD fail when chunks necessary for reconstruction
and color correction are out of order. and color correction are out of order.
[Metadata](#metadata) and [unknown](#unknown-chunks) chunks MAY appear out of [Metadata](#metadata) and [unknown chunks](#unknown-chunks) MAY appear out of
order. order.
**Rationale:** The chunks necessary for reconstruction should appear first in **Rationale:** The chunks necessary for reconstruction should appear first in
@ -401,7 +401,7 @@ Background Color: 32 bits (_uint32_)
around the frames, as well as the transparent pixels of the first frame. around the frames, as well as the transparent pixels of the first frame.
The background color is also used when the Disposal method is `1`. The background color is also used when the Disposal method is `1`.
**Note**: **Notes**:
* The background color MAY contain a non-opaque alpha value, even if the * The background color MAY contain a non-opaque alpha value, even if the
_Alpha_ flag in the ['VP8X' Chunk](#extended_header) is unset. _Alpha_ flag in the ['VP8X' Chunk](#extended_header) is unset.