Wireless Application Protocol Bitmap Format

Last updated
Wireless Bitmap
Filename extension
.wbmp
Internet media type
image/vnd.wap.wbmp
Developed by WAP Forum
Type of format Image 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.

Contents

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 nameField typeSize (in bytes)Purpose
Type uintvar variableType of the image, and is 0 for monochrome bitmaps.
Fixed header byte 1Reserved. Always 0.
Width uintvar variableWidth of the image in pixels.
Height uintvar variableHeight of the image in pixels.
Databyte arrayvariableData 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.

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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.