[vtk-developers] DPI changes and invalidation of vtkOpenGLContextDevice2D string texture cache

Elvis Stansvik elvis.stansvik at orexplore.com
Sat Aug 25 08:45:55 EDT 2018

2018-08-25 14:04 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
> Hi Marcus and all,
> Marcus, I found this (very) old post of yours where you linked to a
> Gerrit change in which (I believe) you fixed a problem with the string
> texture cache of vtkOpenGLContextDevice2D not being invalidated when
> the font size, color et.c. changes:
>     https://www.vtk.org/pipermail/vtkusers/2011-November/071067.html
> The reason I'm asking is that I'm suspecting that, since the DPI is
> taken into account when these textures are created, the cache should
> be invalidated also when the DPI of the render window changes?
> I'm in a situation now where I'm trying to make our application react
> well to DPI changes, but a simple SetDPI on the render window, the
> axis label text sizes do not change. So I'm faced with perhaps having
> to recreate the entire chart when the DPI changes.
> Does it sound plausible that it could be the texture cache mentioned
> in that old thread?

Nevermind, I've just discovered that something is mysteriously
re-setting the DPI to 72 after I set it.

I'll have to investigate that issue instead.


> Many thanks in advance,
> Elvis

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