[Kde-imaging] Gettings a segfault with libkdcraw?

[Gilles Caulier]

Sound like you init your QImage as RGB, and you fill it in RGBA...
crash must appear in loop which fill pixels data...

All the rest  is fine.

Note : libkdcraw as a method to get QImage directly... No need to
re-invent the wheel

Gilles Caulier

2009/7/17  <kde at timotheegroleau.com>:
> Hello there,
>
> My name is Tim, I'm a kphotoalbum user and wannabe dev (please bear with me),
> and I'm trying to use likdcraw build myself a batch conversion utility for my
> Nikon D60 raws.
>
> Although I have some (very rusted) c++ background, I have never developed on
> linux before so I'm just getting started. I volunteered help to kphotoalbum
> before but so far, erm, I haven't had time to do anything at all :( .
>
> Anyway, I made a one-file test program with code taken from kphotoalbum (see
> attached  timtest.cpp) which I managed to compile, but which gives me a
> segfault with  the following output (in the method decodeRAWImage of KDcraw).
> =============================
> processing
> <unknown program name>(8027)/ KDcrawIface::KDcraw::loadFromDcraw: LibRaw:
> dcraw emulation:  ("-H 0", "-w", "-q 0", "-o 1", "DSC_6323.NEF")
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Reading metadata  pass  0  of  2
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Reading metadata  pass  1  of  2
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Reading RAW data  pass  0  of  2
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Reading RAW data  pass  1  of  2
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Scaling colors  pass  0  of  2
> Scaling with darkness 0, saturation 4095, and
> multipliers 1.429688 1.000000 1.933594 1.000000
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Scaling colors  pass  1  of  2
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Pre-interpolating  pass  0  of  2
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Pre-interpolating  pass  1  of  2
> Bilinear interpolation...
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Interpolating  pass  0  of  3
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Interpolating  pass  1  of  3
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Interpolating  pass  2  of  3
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Converting to RGB  pass  0  of  2
> Converting to sRGB colorspace...
> <unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback:
> LibRaw progress:  Converting to RGB  pass  1  of  2
> <unknown program name>(8027)/ KDcrawIface::KDcraw::loadFromDcraw: LibRaw: data
> info: width= 3900  height= 2613  rgbmax= 255
> Segmentation fault
> =============================
> How can I troubleshoot this and move on?
>
> For info on my system, I'm on gentoo, with qt 4.5.2, likdcraw 4.2.4-r1 (that's
> the gentoo version, the header file /usr/include/libkdcraw/version.h shows
> kdcraw_version[] = "0.4.2")
>
> I've uploaded the raw file at the following url, for reference:
> http://timotheegroleau.com/tmp/DSC_6323.NEF
>
> kphotoalbum and the kipi raw exporter have no problem handling this file btw,
>
> Maybe to extend on what I am trying to do: I'm making my own utility using
> code taken from kphotoalbum, because kphotoalbum manages to show me my raws
> with the color as per what my Nikon D60 was showing me on its LCD. I tried
> using command line dcraw, and using the raw export in the kipi plugins, but in
> both cases, no matter what parameters I try to change, I am always getting
> images which are either too dark or with washed out colors. kphotoalbum shows
> me the pics just like I want them (the color, exposure, and white balance
> match the embedded thumbnail created by the camera), out of the box. I looked
> at the code and it seems to just use all the default settings of libkdcraw. So
> this is why I'm trying to use it in the same way to see if I would get the
> same results. If there is another way to manage that, I'd be very happy to
> hear about it. In particular, if the kipi raw converter plugin could give the
> same result as kphotoalbum gives me, I'd much rather use that.
>
> Any advice is much appreciated, many thanks in advance.
> Tim.
>
>
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