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List:       pykde
Subject:    Re: [PyQt] writing to a QImage buffer
From:       Florian Bruhin <me () the-compiler ! org>
Date:       2014-11-13 5:13:50
Message-ID: 20141113051350.GI5944 () lupin
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* James Conger <jlconger@yahoo.com> [2014-11-12 17:00:01 -0800]:
> QImage.scanLine() returns a sip void * pointer to a memory block containing one row \
> of the image. For performance reasons I would like to write pixel RGB data directly \
> to that buffer from within my Python code. How do you convert the void * pointer to \
> a r/w object such as a Python array?  
> Many thanks.

See
http://pyqt.sourceforge.net/Docs/PyQt5/gotchas.html#support-for-void

    A sip.voidptr may also be given a size (ie. the size of the block
    of memory that is pointed to) by calling its setsize() method. If
    it has a size then it is also able to support Python's buffer
    protocol and behaves like a Python memoryview object so that the
    block of memory can be treated as a mutable list of bytes.

Florian

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