[Digikam-devel] [Bug 288761] New: cached image corrupted after modifying metadata

[kde at schreiber-rolf.de]

https://bugs.kde.org/show_bug.cgi?id=288761

           Summary: cached image corrupted after modifying metadata
           Product: digikam
           Version: 2.5.0
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: kde at schreiber-rolf.de


Created an attachment (id=66641)
 --> (http://bugs.kde.org/attachment.cgi?id=66641)
corrupted image

Version:           2.5.0 (using KDE 4.7.2) 
OS:                Linux

I've configured digikam to save metadata embedded in my picture files, which
are usually jpg. Now when I modify metadata, i.e. assign or modify tags or
ratings, the shown image gets updated, and often is corrupted, that is, only
part of the picture remains visible, the rest is only one gray color. The saved
file is not currupted, I guess you call it the cached image which is shown,
which is corrupted.

I assume that this is caused by reloading the cached image while the disk file
write hasn't completely finished. This happens about one out of 3 times, when
I'm modifying data. How much of the picture is corrupted varies from 0-100%,
but it's always a straight cut as shown in the attached screenshot.

This problem happens here at least with digikam 1.4, 1.7, 2.0, 2.5






Reproducible: Sometimes

Steps to Reproduce:
Assign rating by hitting Ctrl-1 or Ctrl-2, ...

It happens "easier" if you do this in a fast sequence, like press Ctrl-1 five
times in a second.


Actual Results:  
The image on the screen is partially corrupted as shown in the screenshot. 

The log shows for example (the messages "slotFileRemoved, slotFileDeleted,...
were created by me):

digikam(22644)/digikam (core) Digikam::DMetadata::getImageHistory: Loading
image history  ""
digikam(22644)/digikam (core) Digikam::DMetadata::setImageTitles:
"/home/speicher/gqview/test/DSCN3798.JPG"  ==> Title:  QMap()
digikam(22644)/digikam (core) Digikam::DMetadata::setImageComments:
"/home/speicher/gqview/test/DSCN3798.JPG"  ==> Comment:  QMap()
digikam(22644)/digikam (core) Digikam::DMetadata::setImageRating:
"/home/speicher/gqview/test/DSCN3798.JPG"  ==> Rating:  3
slotFileClosedAfterWrite:  "/home/speicher/gqview/test/DSCN3798.JPG22644" 

digikam(22644)/digikam (core) Digikam::AlbumWatch::rescanDirectory: Detected
change, triggering rescan of directory "/home/speicher/gqview/test"
slotFileClosedAfterWrite:  "/home/speicher/gqview/test/DSCN3798.JPG" 

digikam(22644)/digikam (core) Digikam::AlbumWatch::rescanDirectory: Detected
change, triggering rescan of directory "/home/speicher/gqview/test"
slotFileDeleted:  "/home/speicher/gqview/test/DSCN3798.JPG" 

digikam(22644)/digikam (core) Digikam::AlbumWatch::rescanDirectory: Detected
change, triggering rescan of directory "/home/speicher/gqview/test"
slotFileMoved:  "/home/speicher/gqview/test/DSCN3798.JPG22644" 

digikam(22644)/digikam (core) Digikam::AlbumWatch::rescanDirectory: Detected
change, triggering rescan of directory "/home/speicher/gqview/test"
slotFileMoved:  "/home/speicher/gqview/test/DSCN3798.JPG" 

digikam(22644)/digikam (core) Digikam::AlbumWatch::rescanDirectory: Detected
change, triggering rescan of directory "/home/speicher/gqview/test"
digikam(22644)/digikam (core) Digikam::DImg::load:
"/home/speicher/gqview/test/DSCN3798.JPG"  : JPEG file identified
digikam(22644)/digikam (core)
Digikam::ScanControllerLoadingCacheFileWatch::slotImageChanged: 27689
"/home/speicher/gqview/test/DSCN3798.JPG"



Expected Results:  
image remains intact

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