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webp-container-spec.txt,cosmetics: normalize formatting

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- prefer Exif to EXIF when not referring to the chunk
- normalize use of code format for canvas / frame width & height

Change-Id: I7fc9e87baeb5d8e719274680ce621dcb078a985f
This commit is contained in:
James Zern
2022-01-25 18:36:36 -08:00
parent 6f49654024
commit 88b6a396f1
1 changed files with 15 additions and 15 deletions
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30
doc/webp-container-spec.txt
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@@ -36,7 +36,7 @@ for:
* **Lossless compression.** An image can be losslessly compressed, using the
WebP Lossless Format.
* **Metadata.** An image may have metadata stored in EXIF or XMP formats.
* **Metadata.** An image may have metadata stored in Exif or XMP formats.
* **Transparency.** An image may have transparency, i.e., an alpha channel.
@@ -94,7 +94,7 @@ _1-based_
RIFF File Format
----------------
The WebP file format is based on the RIFF (resource interchange file format)
The WebP file format is based on the RIFF (Resource Interchange File Format)
document format.
The basic element of a RIFF file is a _chunk_. It consists of:
@@ -261,7 +261,7 @@ An extended format file consists of:
* Image data.
* An optional 'EXIF' chunk with EXIF metadata.
* An optional 'EXIF' chunk with Exif metadata.
* An optional 'XMP ' chunk with XMP metadata.
@@ -317,9 +317,9 @@ Alpha (L): 1 bit
: Set if any of the frames of the image contain transparency information
("alpha").
EXIF metadata (E): 1 bit
Exif metadata (E): 1 bit
: Set if the file contains EXIF metadata.
: Set if the file contains Exif metadata.
XMP metadata (X): 1 bit
@@ -341,12 +341,12 @@ Reserved: 24 bits
Canvas Width Minus One: 24 bits
: _1-based_ width of the canvas in pixels.
The actual canvas width is '1 + Canvas Width Minus One'
The actual canvas width is `1 + Canvas Width Minus One`.
Canvas Height Minus One: 24 bits
: _1-based_ height of the canvas in pixels.
The actual canvas height is '1 + Canvas Height Minus One'
The actual canvas height is `1 + Canvas Height Minus One`.
The product of _Canvas Width_ and _Canvas Height_ MUST be at most `2^32 - 1`.
@@ -423,21 +423,21 @@ If the _Animation flag_ is not set, then this chunk SHOULD NOT be present.
Frame X: 24 bits (_uint24_)
: The X coordinate of the upper left corner of the frame is `Frame X * 2`
: The X coordinate of the upper left corner of the frame is `Frame X * 2`.
Frame Y: 24 bits (_uint24_)
: The Y coordinate of the upper left corner of the frame is `Frame Y * 2`
: The Y coordinate of the upper left corner of the frame is `Frame Y * 2`.
Frame Width Minus One: 24 bits (_uint24_)
: The _1-based_ width of the frame.
The frame width is `1 + Frame Width Minus One`
The frame width is `1 + Frame Width Minus One`.
Frame Height Minus One: 24 bits (_uint24_)
: The _1-based_ height of the frame.
The frame height is `1 + Frame Height Minus One`
The frame height is `1 + Frame Height Minus One`.
Frame Duration: 24 bits (_uint24_)
@@ -677,12 +677,12 @@ EXIF chunk:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ChunkHeader('EXIF') |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EXIF Metadata |
| Exif Metadata |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
EXIF Metadata: _Chunk Size_ bytes
Exif Metadata: _Chunk Size_ bytes
: image metadata in EXIF format.
: image metadata in Exif format.
XMP chunk:
@@ -798,7 +798,7 @@ RIFF/WEBP
+- XMP (metadata)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
An animated image with EXIF metadata may look as follows:
An animated image with Exif metadata may look as follows:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
RIFF/WEBP