[fpc-devel] JPEG scaling

[theo]

Hello,

Is there a technical reason why in packages/fcl-image/src/fpreadjpeg.pas 
the scale option is commented / not implemented?

I've changed that unit for my purpose (see attachment. I hope the patch 
is valid, I don't have a svn fpc, so it's hand edited).

I have to create thumbnail images and found, that pre-scaling via 
fpreadjpeg.pas makes loading the images a lot faster.
Of course resampling to the final size is faster too.

The idea of the attached code is, to set MinWidth/MinHeight to the size 
of the desired thumbnail.
The image is pre-shrunk this way (still always bigger than thumbnail) 
and can be resampled afterwards via stretch draw.

Any problems to expect?

Thank you
Best regards
Theo
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