An area of storage which describe the pixels of an image.
From the doc...
Everything in Bmax is loaded as a pixmap (even images).
When you drawimage for the first time the pixmap information is used to create a textured surface. This and subsequent drawimages blit that surface to the backbuffer.
From the doc...
Pixmaps Pixmaps provide storage for rectangular regions of pixels. You can create a new pixmap using the CreatePixmap command, or load a pixmap from a stream using LoadPixmap. Pixmaps have 5 properties: width, height, a byte pointer to the pixmap's pixels, pitch and format. You can retrieve a pointer to a pixmap's pixels using the PixmapPixelPtr command. A pixmap's pitch refers to the number of bytes between one row of pixels in the pixmap and the next. To retrieve a pixmap's pitch, use the PixmapPitch command. A pixmap's pixel format determines how the pixels within a pixmap are stored in memory. This must be taken into account if you want to access pixels directly via a pixmap's pixel pointer. You can retrieve the format of a pixmap using the PixmapFormat command, and convert pixmap's from one format to another using ConvertPixmap. You can also resize a pixmap, flip a pixmap horizontally or vertically and more.
Everything in Bmax is loaded as a pixmap (even images).
When you drawimage for the first time the pixmap information is used to create a textured surface. This and subsequent drawimages blit that surface to the backbuffer.