[Bug 149875] New: support interlaced PNG images

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           Summary: support interlaced PNG images
           Product: digikam
           Version: unspecified
          Platform: Slackware Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: mkosmul users sourceforge net


Version:           0.9.2 (using KDE KDE 3.5.7)
Installed from:    Slackware Packages
OS:                Linux

As of 0.9.2, Digikam doesn't support interlaced PNG images (it doesn't show thumbnails for them in the album view nor can it display them in the image editor). I created some PNG images using the GIMP. If they are saved as uninterlaced PNGs, both the thumbnails and the image editor work as expected. If I generate them in the interlaced PNG format, no thumbnails are shown and the image viewer/editor can't display them.
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[Gilles Caulier-4]

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caulier.gilles gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Image Editor
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[Marcel Wiesweg]

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------- Additional Comments From marcel.wiesweg gmx de  2007-10-02 19:26 -------
Can you give me a sample image? Same image, one version with, the other without interlacing. Attach it if it is a small one, or you can send it to my mail address, file size is then no problem.
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------- Additional Comments From mkosmul users sourceforge net  2007-10-02 22:45 -------
Created an attachment (id=21741)
 --> (http://bugs.kde.org/attachment.cgi?id=21741&action=view)
Sample image - noninterlaced PNG

This is a non-interlaced PNG file, displayed correctly by the image editor
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------- Additional Comments From mkosmul users sourceforge net  2007-10-02 22:47 -------
Created an attachment (id=21742)
 --> (http://bugs.kde.org/attachment.cgi?id=21742&action=view)
Sample image - interlaced PNG

This is the same image as attachment 21741, but saved as an interlaced PNG
file. Both were created using the GIMP by taking a screenshot of the KDE bug
tracking system's homepage and saving as PNG with interlacing turned either on
or off. Note, that for both images, the thumbnail in the main digikam window is
displayed correctly, only the image editor has problems with interlaced PNGs.
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------- Additional Comments From mikmach wp pl  2007-10-03 00:53 -------
Confirming problem for Showfoto 0.7svn

I see thumbnail in thumbbar but get message "Cannot load file int.png"

This is console output:

Found dcraw version: 8.77
QMultiInputContext::changeInputMethod(): index=0, slave=xim
QMultiInputContext::changeInputMethod(): index=0, slave=xim
QFile::open: No file name specified
QFile::open: No file name specified
libpng warning: Ignoring bad adaptive filter type
libpng warning: Extra compressed data.
libpng warning: Extra compression data
libpng error: incorrect header check
showfoto: WARNING: Failed to load image int.png
showfoto: WARNING: [Digikam::DImg* Digikam::DImgInterface::getImg()]
d->image is NULL
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[Marcel Wiesweg]

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------- Additional Comments From marcel.wiesweg gmx de  2007-10-16 18:03 -------
Debugging another problem I noted a problem in the PNG loader that may be causing this (doc says that png_set_interlace_handling shall be called before png_read_update_info). I will look into that later.
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