High Quality Content by WIKIPEDIA articles! In computer graphics, the X Window System uses X BitMap (XBM), an ASCII text monochrome image format, for storing cursor and icon bitmaps used in the X GUI. XBM files differ markedly from most image files in that they take the form of C source files. This means that they can be compiled directly into an application without any preprocessing steps, but it also makes them far larger than their raw pixel data would be (each byte of image data takes at least 4 bytes in a XBM file). XBM data typically appears in headers (.h files) and consist of a series of static unsigned char arrays containing the monochrome pixel data. They feature one array per image stored in the header. In place of the usual image-file-format header, XBM files have two or four #define statements. The first two #defines specify the height and width of the bitmap in pixels. The second two, if they exist, specify the position of any hotspot within the bitmap.

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