[Digikam-devel] Re: how to properly store a curve in XML

[Johannes Wienke]

On 11/10/2010 03:42 PM, Marcel Wiesweg wrote:
> when a curves filter is applied, we need to store the curves in the
> FilterAction written to metadata.
> Now, the problem is that the CurvesFilter has five polygon each holding
> potentially 65536 values - this is not very suitable for writing to XML.
>
> I see two other places where a curve is saved:
> - CurvesWidget::saveCurve
> - ImageCurves::saveCurvesToGimpCurvesFile.
>
> Are digikam curves Bezier curves? Then we could encode them in SVG style:
> http://apike.ca/prog_svg_paths.html
>
> Which would be the best way to store curves efficiently and correctly?

Every curve is defined by keypoints by the user. Why not simply store 
these keypoints?

Johannes