get data from gdImagePtr

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this may seems offtopic for php developers but not for gd-devs
I am doing some vector rendering using libgd. I filled the gdImagePtr with
drawpoint/drawline/drawpolygon functions. now if I save the gdImagePtr to
some file i will get png/jpeg image.

upto here its fine


now comes the real problem......

I am using Qt as a front end for displaying image from gd. currently it
works like this gdImagePtr --> pngfile --> QPixmap --> Qt

I dont want to create a png file everytime the gdImagePtr is update (each
zoom/pan will update gdImagePtr)

so converting to file and reading again is a overhead in my case
I want to show gdImagePtr on QPixmap with all conversion process running on
memory.

Is that possible in gd?


How to pull chunk of data from gdImagePtr?

Any will be much appreciated...

Thanks in Advance

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Regards,
   Rashad

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