[Digikam-devel] [digikam] [Bug 335661] CANVAS : image is displayed with wrong magnification after crop

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=335661

--- Comment #17 from Gilles Caulier <caulier.gilles at gmail.com> ---
Local Contrast tool is this filter :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/entry/libs/dimg/filters/lc/localcontrastfilter.h

Running through this image editor tool :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/entry/imageplugins/enhance/localcontrasttool.h

based on this parent class from editor :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/changes/utilities/imageeditor/editor/editortool.h

The tool is loaded in editor canvas with this interface :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/changes/utilities/imageeditor/editor/editortooliface.h

To resume, editor canvas is a widget stack. There is a main canvas based on
this widget :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/entry/utilities/imageeditor/widgets/canvas.h

...and tool loaded pass a dedicated canvas widget. The interface switch between
main to tool canvas accordingly with user action. In case of local contrast,
the widget loaded by interface is this one :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/entry/utilities/imageeditor/widgets/imageregionwidget.h

When interface load/unload Canvas/ImageRegionWidget and vis versa, the zoom
level and visible region of the canvas must be preserved/restored beofre and
after tool session.

I think the problem is located in this rules from editor interface, probably
due to a race condition somewhere (i never reproduce this problem, excepted in
rarely particular conditions)

Gilles Caulier

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