User`s manual

Reference Manual 139

Know Limitations

1. Each OSD frame can only contain up to 90 fonts in the

single OSD string case.

2. Font size can only be 16*16, which is macro block

based.

How to display customer defined size bitmap

The firmware only can display 16*16 OSD bitmaps. However, cus-

tomers can still show bigger bitmaps by proper software program-

ming skills. For example, a 32*32 pixel bitmap, software can

display 32*32’s bitmap by dividing it into 4 small 16*16 bitmap, first

download the divided 16*16 bitmap to the firmware, then display

the small bitmap corresponding to their X,Y position. See following

description:

To display a 32*32 pixel “A”, we can divide a 32*32 “A” into 4

16*16 sub bitmap, 1, 2, 3, 4, then create a OSD frame containing 2

(or 4) OSD string: