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List:       openjdk-openjfx-dev
Subject:    Re: Setting the FreeType LCD filter
From:       Philip Race <philip.race () oracle ! com>
Date:       2018-09-30 21:03:58
Message-ID: 5BB13A3E.1000909 () oracle ! com
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Hi,

Your explanation makes sense.
Compile time linking is probably best so long as we can verify that
the function is available on all the platforms we need to build & run on 
.. notably
older versions of OEL&RHEL.

Failing that, then as well as adding ".6" we should initialise

     jint rc =-1;

instead of to zero .. so that failure to find the function isn't confused
as failure *of* the function, which in a nutshell, seems to be the bug here.
And I suppose we have the same bug on "older" systems where the freetype library is
found but lack the symbol.

Is there no JBS bug id already open on this ? If one was closed as not reproducible,
we can re-open it. Better than creating a new one.

-phil.

On 9/30/18, 12:03 PM, John Neffenger wrote:
> I think I found the cause of the text rendering problem I have always 
> seen in JavaFX applications on Linux:
>
> Reduce color fringes in FreeType subpixel rendering
> https://github.com/javafxports/openjdk-jfx/issues/229
>
> I'm finally seeing the fonts as they were intended! I used the Oracle 
> bug report outline as a template for the GitHub issue to make it easy 
> to copy to the Java Bug Database. Do I need a Java Bug ID before I 
> submit a pull request?
>
> Thanks,
> John
>
> P.S.: For background information, there is a great demonstration of 
> LCD filtering algorithms by Felipe Heidrich at 1:02:47 into the video 
> "JavaFX Text Rendering" <https://youtu.be/LCrCni6EVek?t=1h2m47s>. The 
> link takes you directly to the two-minute segment showing the text 
> rendered by FreeType, first with no filter, and then with its various 
> filter options. (Note: the audio is a bit loud.)
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