[Kde-imaging] [kipiplugins] [Bug 320107] Flip/Mirror operation doesn't flip/mirror the entirety of the picture (there is a strip left unmirrored)

[Nicofo]

https://bugs.kde.org/show_bug.cgi?id=320107

--- Comment #7 from Nicofo <nicofo at tuxfamily.org> ---
OK. After reading the bug #146381, especially the comments 9 and 10, I think
the better solution is:

1) if the size of the picture is a multiple of 8 -> no problem: gwenview can
rotate the picture as now, losslessly

2) if the size of the picture is not a multiple of 8, gwenview can propose a
dialog box with 2 choices:
 2a) lossly rotate the picture (and of course inform the user it is lossly)
 2b) propose to crop the image to a multiple of 8 and then losslessly rotate it

A third choice "rotate losslessly and leave a strip unrotated" must not be
proposed as nobody wants such a resulting picture !

2b solution is the best solution for big pictures (a little crop will have
nearly no visible result) while 2a is sometimes the only solution for little
pictures => both options must be proposed to the user.

PS: can somebody confirm that a picture that is NOT a multiple of 8 cannot be
losslessly rotated ? Are there other program that jpegtran that would do that ?

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