Printing problem (bko 129948)

http://bugs.kde.org/show_bug.cgi?id=129948

Hi,
I found the way to get dpi info from png file
using dotsPerMeterX and dotsPerMeterY, since they
are set from PNGFormat. Looking at the code it is
probably possible also for xcf ones.
It seems setDotsPerMeterX and setDotsPerMeterY
are missed for other image formats. Is it possible
to have them for jpeg and maybe also for tiff.
From jpeg it should be possible reading
units -- one byte: Units for the X and Y densities
0 => no units, X and Y specify the pixel aspect ratio
1 => X and Y are dots per inch
2 => X and Y are dots per cm
Xdensity -- two bytes
Ydensity -- two bytes

Aurélien since I'm not expert in it i need help here.

TIA
	Angelo

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