[vtk-developers] [vtkusers] HiDPI not working on VTK 7.1.0 rc2

[Elvis Stansvik]

2017-05-11 19:13 GMT+02:00 Marcus D. Hanwell <marcus.hanwell at kitware.com>:
> On Thu, May 11, 2017 at 11:57 AM, Elvis Stansvik
> <elvis.stansvik at orexplore.com> wrote:
>>
>> Den 11 maj 2017 5:50 em skrev "Elvis Stansvik" <elvis.stansvik at orexplore.com>:
>> >
>> > Den 11 maj 2017 5:25 em skrev "Marcus D. Hanwell" <marcus.hanwell at kitware.com>:
>> > >
>> > > On Thu, May 11, 2017 at 11:17 AM, Elvis Stansvik
>> > > <elvis.stansvik at orexplore.com> wrote:
>> > > > 2016-11-07 19:58 GMT+01:00 Sean McBride <sean at rogue-research.com>:
>> > > >> On Fri, 4 Nov 2016 14:36:56 -0400, Marcus D. Hanwell said:
>> > > >>
>> > > >>>On Fri, Nov 4, 2016 at 8:28 AM, Michael Jackson
>> > > >>><mike.jackson at bluequartz.net> wrote:
>> > > >>>> I just tried the HiDPI support on VTK 7.1.0-rc2 and I get the usual VTK
>> > > >>>> rendering canvas that is half the size of the widget that it is embedded
>> > > >>>> into.
>> > > >>>>
>> > > >>>> We are using Qt 5.6.2 on macOS 10.10.5. I compiled my original pull request
>> > > >>>> (way back in Aug 2016) and that patch gives me a full size canvas. But when
>> > > >>>> compiling the latest VTK 7.1.0-rc2 I get the half size canvas. I thought the
>> > > >>>> branch was merged on Sept 28 2016 but I guess I got busy and never actually
>> > > >>>> tested it on a retina screen.
>> > > >>>>
>> > > >>>> Most likely I am doing something wrong in the initialization in my code but
>> > > >>>> just in case can anyone else confirm with Qt 5.6.x that they can actually
>> > > >>>> get a Retina/HiDPI canvas?
>> > > >>>>
>> > > >>>Bob has a retinal Mac that I can do some testing on, this is likely to
>> > > >>>end up being after Supercomputing, but I would like to follow up on
>> > > >>>this. We had it working when you visited, and I am hoping to get this
>> > > >>>enabled in Tomviz at some point soon. It would be great to hear from
>> > > >>>Sean and/or David. To the best of my recollection an alternate
>> > > >>>approach was developed, and that was merged. It had several other
>> > > >>>changes in addition to what was proposed originally.
>> > > >>
>> > > >> We merged my PR:
>> > > >> <https://gitlab.kitware.com/vtk/vtk/merge_requests/2019>
>> > > >>
>> > > >> and not Mike's:
>> > > >> <https://gitlab.kitware.com/vtk/vtk/merge_requests/1791>
>> > > >>
>> > > >> IIRC mine was a superset of Mike's, unless we screwed something up somewhere.  I was always of the view that the changes were necessary but not sufficient.
>> > > >>
>> > > >> I'm swamped this week preparing for the SfN conference, but can look more next week...
>> > > >
>> > > > Bumping this old thread since I'm in this boat as well now.
>> > > >
>> > > > I've finally gotten around to porting our application to macOS.
>> > > > Everything went pretty smooth. We're using 7.1.1, and we're using
>> > > > QVTKWidget (will port to QVTKOpenGLWidget once 8.0.0 is out).
>> > > >
>> > > > I am however seeing the problem on a retina screen that VTK render
>> > > > windows only take up a quarter of their alotted space.
>> > > >
>> > > > So my question: Is it possible to make VTK work fine on retina
>> > > > displays with 7.1.1? If not, is there some patch I could apply? Or
>> > > > will I have to build from Git (to be 8.0.0)?
>> > > >
>> > > So I worked on some pieces of this, but may not know all the moving
>> > > parts. If you are using Qt 5 and want a retinal display application,
>> > > then you should be using QVTKOpenGLWidget. If you are using Qt 4 then
>> > > it will never work properly as Qt 4 lacks the support, or not to the
>> > > best of my knowledge. We did quite a bit of work, but it focused on
>> > > the QVTKOpenGLWidget and Qt 5, but you would need master or the 8.0
>> > > release.
>> >
>> > Alright, thanks for the info Marcus. I better switch to VTK master and try out the new widget for the macOS build then. Was planning on that anyway soon.
>>
>> But just so I'm clear, QVTKWidget won't work well, even with master?
>>
> It will work well with Qt 4, OK with Qt 5 but it will not give you a
> retinal resolution widget on macOS. Tomviz tracked the bleeding edge,
> and used QVTKWidget for a while with Qt 5 (a year or more), but there
> were several issues we never resolved. Developing the QVTKOpenGLWidget
> let us move past that, and was the first widget to yield VTK OpenGL
> rendering at full resolution on retinal macOS displays.

Alright. Sounds like QVTKOpenGLWidget is the way to go then, sooner
rather than later. I guess also good since it'll provide some
pre-release testing of master in preparation for 8.0.0.

Elvis