imported>WeyerStudentOfAgrippa: Importing Wikidata short description: "File format"

2025-01-12T17:44:41Z

Importing Wikidata short description: "File format"

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{{Short description|File format}}

{{Infobox file format
| name = Wireless Bitmap
| extension = {{mono|.wbmp}}
| mime = image/vnd.wap.wbmp
| owner = [[WAP Forum]]
| creatorcode =
| genre = [[Image file formats]]
| conforms_to =
| containerfor =
| containedby =
| extendedfrom =
| extendedto =
}}
'''Wireless Application Protocol Bitmap Format''' (shortened to '''Wireless Bitmap''' and with file extension '''.wbmp''') is a [[raster graphics|raster]] [[image file format]] optimized for early [[mobile computing]] devices.

WBMP images are [[monochrome]] black and white [[binary image]]s in which a black pixel is denoted by 0 and a white pixel is denoted by 1. The simple pixel encoding and the small size of the [[file header]] mean that the file size is kept to a minimum, enabling fast transmission on slow networks.<ref name="WBMP spec">{{cite web |title=WAP Wireless Application Environment Specification Version 1.1 |url=https://www.wapforum.org/what/technical/SPEC-WAESpec-19990524.pdf |website=wapforum.org |publisher=Wireless Application Protocol Forum Ltd |access-date=29 September 2024 |date=24 May 1999}}</ref>

==File format==

{|class="wikitable" style="margin: 1em auto 1em auto"
|-
!Field name
!Field type
!Size (in bytes)
!Purpose
|-
|Type
|[[Variable length unsigned integer|uintvar]]
|variable
|Type of the image, and is 0 for monochrome bitmaps.
|-
|Fixed header
|[[byte]]
|1
|Reserved. Always 0.
|-
|Width
|[[Variable length unsigned integer|uintvar]]
|variable
|Width of the image in pixels.
|-
|Height
|[[Variable length unsigned integer|uintvar]]
|variable
|Height of the image in pixels.
|-
|Data
|byte array
|variable
|Data bytes arranged in rows – one bit per pixel. A black pixel is denoted by 0 and a white pixel is denoted by 1. The pixel order within a byte is MLP (most left pixel) = MSB (most significant bit). Where the row length is not divisible by 8, the row is 0-padded to the byte boundary.
|}

==References==
{{reflist}}

==External links==
* [http://www.wapforum.org/what/technical/SPEC-WAESpec-19990524.pdf WAP WAE Specification]
* [http://www.openmobilealliance.org/ Open Mobile Alliance]

{{Open Mobile Alliance standards}}
{{Graphics file formats}}
{{Compression formats}}

[[Category:Open Mobile Alliance standards]]
[[Category:Graphics file formats]]

Wireless Application Protocol Bitmap Format - Revision history

imported>WeyerStudentOfAgrippa: Importing Wikidata short description: "File format"