Wireless Application Protocol Bitmap Format

Wireless Bitmap
Filename extension
.wbmp
Internet media type
image/vnd.wap.wbmp
Developed byWAP Forum
Type of formatImage file formats

Wireless Application Protocol Bitmap Format (shortened to Wireless Bitmap and with file extension .wbmp) is a raster image file format optimized for early mobile computing devices.

WBMP images are monochrome black and white binary images 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.[1]

File format

Field name Field type Size (in bytes) Purpose
Type uintvar variable Type of the image, and is 0 for monochrome bitmaps.
Fixed header byte 1 Reserved. Always 0.
Width uintvar variable Width of the image in pixels.
Height 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

  1. ^ "WAP Wireless Application Environment Specification Version 1.1" (PDF). wapforum.org. Wireless Application Protocol Forum Ltd. 24 May 1999. Retrieved 29 September 2024.

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