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Problem about update osd text in DVRRDK2.80 on DM8168 platform

Hi all:

I want to draw text on the video output using DVRRDK2.80 on DM8168 platform,

I see this part in packages DVRRDK3.50

Demo_draw_text() is added to do this work,

so i add this function in DVRRDK2.80,

the time information display ok, 

but when i use Demo_draw_text to update a new string whose length is not 8(00:00:00),

the display failure , as the length is not 8 anymore,

as i do not want to change the packages DVRRDK3.5,

So could you tell me how to do this in dvrrdk2.80

best regards

xavier