[vtk-developers] Need variable VTK_USE_FONTCONFIG?

[Pat Marion]

I +1'd the patch, and I don't propose that we keep dragging the topic
branch along, but I wanted to describe an alternative implementation, I'm
curious how you guys stand on this.  I don't pretend to fully understand
the vtk modular system of cross-module object factory overrides with
inheritance, but it looks fairly complicated.  Maybe fontconfig could be
enabled without it?

In the current implementation, the user enables fontconfig by calling a
function in the FreeType module:

vtkFreeTypeTools::GetInstance()->ForceCompiledFontsOff();

Instead, it could be enabled by calling a function in the FontConfig
module, something like:

static void vtkFontConfig::EnableFontConfig()
{
  vtkFreeTypeTools::GetInstance()->RegisterFontFaceFactory
(vtkFontConfigFontFaceFactory::New());
}


A related question, how come ForceCompiledFonts defaults to on?

Pat


On Wed, Aug 1, 2012 at 9:52 AM, David Lonie <david.lonie at kitware.com> wrote:

> On Mon, Jul 30, 2012 at 2:33 PM, David Lonie <david.lonie at kitware.com>
> wrote:
> > On Mon, Jul 30, 2012 at 1:42 PM, Brad King <brad.king at kitware.com>
> wrote:
> >> On 07/30/2012 01:24 PM, Utkarsh Ayachit wrote:
> >>> I think in that case the real solution is to create a "new module"
> >>> that gets built, or not, not based on FONTCONFIG is found/enabled, or
> >>> not.
> >>
> >> Correct.  If the module is on then it requires fontconfig.  If the
> >> module is off then nothing even searches for fontconfig.  The option
> >> is for switching the module on or off just like any other module.
> >
> > Ok -- I'll make another pass at this.
>
> A patch for a modularized FontConfig implementation is here:
>
> http://review.source.kitware.com/#/t/988/
>
> Dave
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