ADLINK Technology PCI-MPG24 Manuel d'utilisateur télécharger pdf (Page 149)

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:

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 159 160

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ADLINK Technology PCI-MPG24 Manuel d'utilisateur Page 149