[fpc-devel] JPEG scaling

[Michael Van Canneyt]

On Thu, 17 Jun 2010, theo wrote:

> 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?

I don't expect any; But I would appreciate it if you could make a bug report
and attache the patch to it. You can assign it to me, this way i won't
forget to apply the patch.

Michael.