wireless application protocol

Wireless Application Protocol Bitmap Format

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

WBMP images are monochrome (black & white) so that the image size is kept to a minimum. A black pixel is denoted by 0 and a white pixel is denoted by 1.

For colored images, WAP supports the Portable Network Graphics format.

Format of Wireless Bitmap Files

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. Where the row length is not divisible by 8, the row is 0-padded to the byte boundary.

Example of a Wireless bitmap

The bitmap where b = black and w = white

Row1 - bwb

Row2 - wbw

Row3 - bwb

becomes

Octet 1: 00000000 (WBMP type)

Octet 2: 00000000 (Fixed header)

Octet 3: 00000011 (Width) = 3

Octet 4: 00000011 (Height) = 3

Octet 5-7: 3 bits for data then Padding (8-3=5)

Octet 5: 010 00000 (Row 1)

Octet 6: 101 00000 (Row 2)

Octet 7: 010 00000 (Row 3)

References

Notes

External links

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