Detect High DPI screen automatically to adjust font scaling

[mwestphal]

Is your feature request related to a problem? Please describe. F3D currently let user set the font scale, which is essential for user on High DPI screens. However this is not ideal, users should not really care about the fact that the screen is High DPI.

Let's detect automatically if the screen is High DPI and multiply the font scale if needed

Describe the solution you'd like

• In vtkF3DRenderer::ConfigureTextActors() detect the DPI and how much it should be scaled using vtkWindow::GetDPI. Default should be 72.
• Adapt the fontscale computation accordingly
• Update documentation
• As this feature will not be testable in CI, add a note in the release issue template to test this on release

[armoredvortex]

Hi, can i get assigned?

[mwestphal]

Need any help moving forward @armoredvortex ?

[mwestphal]

Need any help moving forward @armoredvortex ?

[armoredvortex]

Hi, I'm unable to work on this as of now, feel free to unassign me so someone else can continue. Thanks!

[davidwuluetang]

Hi, may I work on this issue?

[mwestphal]

Of course!