Matrix Orbital GLK24064-25 Legacy - Manual (Page 19)

4 Displaying Graphics
This chapter describes the various graphics display commands in detail. Uploading a bitmap to position
1 will result in it being displayed on power up.
4.1 General
Since the display is a bit mapped device, it may be used to display graphics. Graphic images may be
created by means of a pixel oriented graphics program, saved as bitmaps, and loaded into the display using
the mogd.exe program. Images may be saved in the display’s memory, and displayed upon command or they
may be downloaded ’on the fly’ (inline) during display operation.
Please note that ’saved’ and ’on the fly’ graphics images are processed differently. These differences
must be taken into account when processing graphics.
1. Saved bitmaps: These use each byte (8 bits) to represent a vertical column of 8 pixels. The next byte
represents the next column to the right. If the graphic is ’taller’ than 8 pixels, the LSB of the next data
byte will be the next pixel. Orientation is top to bottom - LSB to MSB. Pixels / bits are ’packed’ - that
is, if the height of the graphic is not an even multiple of 8, the leftover bits go on the next X column
to the right, etc.
2. Inline bitmaps: These are processed horizontally, and each byte represents a horizontal row of 8 bits,
with the next byte representing the next 8 bits to the right. Orientation is left to right - MSB to LSB,
which is the opposite to the serial transmission sequence (bytes are sent LSB first).
Figure 17: Graphic Bitmaps
Each pixel in a bitmap is described by a single bit, and may only have the values ON or OFF. For
example, shades of grey are not supported.
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