TDA2EG-17: TDA2EG-17 - VSDK0307 How to overlay Image.png on Panel? (OSD)

Dear all,

I want to make OSD on panel

I was only looking at  "GrpxSrc -> Display_Grpx"

But It does not seem to support png display on panel

I like to make the picture (ex./home/Image.png) like "null_src_dec_display"  can include video files from outside(/ext4/home/file.H264) and then let picture overlay on panel

Is there any usecase I can refer to? (About overlay image.png is on the panel)

Can let me Include PNG image from SD card ext4 and then overlay on panel? Can give some suggestion or other method? 

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By the way , and have seen this code

I just understand a little bit about how to use this part?

Are there relevant documents or examples for reference?

Thanks!!