Width and height are calculated wrong, when only one of both is given

[mogoh]

Width and height are calculated wrong, when only height is set and width is calculated.

Example

• To reproduce, just use a default django-cms installation, for example this one: https://github.com/mogoh/django_examples/tree/master/cms
• Upload a picture for example this one:
  It has a resolution of 200×100.
• Embed the picture in a page, setting height to e.g. 50.

The result is a picture with the name test2.png__80x50_q85_subsampling-2.jpg and the resolution of 40×40.

Why is that so?

When height is given, but width is not, width is calculated here:

        elif not width and height:
            width = int(height * PICTURE_RATIO)

This would be fine, if PICTURE_RATIO would actually be the ratio.
But PICTURE_RATIO, as capital letters suggest, is not calculated, but a constant, as you can see here.
It should be used, when not width nor height is given.

50×1.6=80 witch is, why the name contains 80x50.
Somewhere else, I don't know where, the actual size is calculated witch results in 80÷2=40 (40x40).

This is basically the same if only width is given.
But in this case, height is calculated wrongly, witch results in a wrong filename, but not in wrong actual size, because the actual size must be calculated somewhere only by resolution and width.
I haven't searched so far.

Please fix this issue.

[FinalAngel]

Will be fixed by #98

[fsbraun]

IS fixed by #100