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List:       kde-bugs-dist
Subject:    [Bug 148238] New: fast switching between preview modes
From:       Dik Takken <d.h.j.takken () phys ! uu ! nl>
Date:       2007-07-26 20:57:00
Message-ID: 20070726225659.148238.d.h.j.takken () phys ! uu ! nl
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http://bugs.kde.org/show_bug.cgi?id=148238         
           Summary: fast switching between preview modes
           Product: digikamimageplugins
           Version: unspecified
          Platform: unspecified
        OS/Version: Linux
            Status: NEW
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: d.h.j.takken phys uu nl


Version:           0.9.2 (using KDE KDE 3.5.5)
OS:                Linux

It would be nice to allow fast switching between preview modes. I'm referring to the "original left, \
filtered right", 'original on top, filtered at bottom' and so on modes. Every time you switch, the \
preview needs to be re-rendered.

Maybe the preview could be rendered for the entire viewport (not just for the right half of the viewport \
for instance), stored in a memory buffer and re-painted when the preview mode changes.

Or even better: Maybe the preview could *always* be painted from a permanent memory buffer, which lives \
as long as the plugin dialog is active: When the dialog is opened, the buffer is created and a preview is \
rendered into it. The buffer is only updated when the user changes settings. Whenever the preview image \
needs to be re-painted, it can be quick-fetched from the memory buffer. When the dialog is closed, the \
buffer is destroyed.


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