New subject: [Bug 23554] Error in GDI affects IrfanView 4.27

7 Jul 2010


      http://bugs.winehq.org/show_bug.cgi?id=23554
Summary: Error in GDI affects IrfanView 4.27
           Product: Wine
           Version: 1.2-rc6
          Platform: x86
               URL: http://en.irfanview-forum.de/vb/showthread.php?6661-V4
                    -27-IrfanPaint-no-longer-keeps-data(removed-when-paint
                    -closed)&p=30835
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdi32
        AssignedTo: wine-bugs@winehq.org
        ReportedBy: mrk@emarkay.com
The plugin for IrafanView, IrfanPaint, has given me trouble in keeping the
changes it has made applied to the original. In 4.25 I found that if you zoomed
to "Original Size" it would keep it's data (lines text, edits, etc.) when the
dialog was closed, but now in 4.27 (with the latest 4.13.67 Paint) , there is
nothing I can find to keep the changes. Even saving "in process" does not keep
the changes made to that point!
...
From Developer of plugin:
"My educated guess on this fact is that Wine for DibSections uses a hybrid
approach: it creates a DIB a DDB (which probably is actually an X bitmap); the
work performed by the GDI methods is done on the DDB/X bitmap, which is
converted to DIB whenever the software tries to write on the DIB bits (I think
they use some kind of page protection method to do that).
So, when IrfanPaint just uses GDI methods to perform his work, the changes are
made just on the DDB and aren't mirrored on the DIB, thus causing the problem;
instead, when IP also writes directly on the DIB bits, before it does so the
changes done to the DDB are automatically mirrored on the DIB, so everything
works fine.
If things are like that, a quick workaround can be created to just make a "fake
write" on the DIB to force the update after each tool use. It would be quite a
small change and it should solve the problem.
Still, IMHO, to make such DIB/DDB system to work successfully they should have
set the update also on DIB read, maybe creating a "dirty flag" to avoid
unnecessary updates. "
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[Bug 23554] New: Error in GDI affects IrfanView 4.27