[PyQt] Usage of QImageWriter.supportsOption()

[Phil Thompson]

On Thu, 29 Nov 2012 11:41:52 +0100, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
> I'm trying to see what option is supported by QImageWriter().
> 
> A test code:
>
-----------------------------------------------------------------------------------------------------
> # -*- coding: utf-8 -*-
> 
> from PyQt4.QtGui import QImageWriter, QImageIOHandler
> 
> frmts = ['bmp', 'bw', 'eps', 'ico', 'jp2', 'jpg', 'pcx',
>                 'pgm', 'png', 'ppm', 'rgb', 'rgba', 'sgi', 'tga',
>                 'tiff', 'xbm', 'xpm', 'xv']
> 
> opts = [QImageIOHandler.CompressionRatio, QImageIOHandler.Gamma,
>         QImageIOHandler.Quality]
> 
> iw = QImageWriter()
> for fr in frmts:
>     print fr, "\t",
>     iw.setFormat(fr)
>     for opt in opts:
>         print iw.supportsOption(opt),
>     print
> 
>
------------------------------------------------------------------------------------------------------
> 
> But, for all formats the options are False:
> 
> ...
> jpg     False False False
> pcx     False False False
> pgm     False False False
> png     False False False
> ppm     False False False
> tga     False False False
> tiff     False False False
> ...
> 
> Python 2.7 > PyQt4 4.9.1
> Python 3.3 > PyQt4 4.9.5
> 
> Thanks for all advices.

QImageWriter can only handle one format, so create a new one in the loop.

Phil