Oracle JDK vs. OpenJDK: font engine differences

[Phil Race]

Hi Volker,

I don't think there is a claim anywhere  that JDK 10 EA "Oracle JDK" 
binaries have
already migrated to be GPL binaries.

The migration from T2K to Freetype still has to take place and I expect 
there
will be occasional rendering and measurement differences which will be
considered incompatibilities but it is inevitable and unavoidable.

It should be mitigated by the facts that Linux distros already use freetype
in their binaries so it should be no difference there, and on Mac. we mostly
use the Mac native coretext renderer, and on Windows we get LCD glyphs
(what most UIs use) from GDI as well.
Still there are plenty of cases where T2K is used for glyphs + metrics.

As to the Lucida fonts, like T2K, if we could have open sourced those we
would have done it in 2007 at the inception of OpenJDK. Whilst the license
was generous it was not that generous ..

I am sure that many apps - and many internal behaviours - were written
with an assumption they were there and we will definitely have to accept
that there will be consequences both in terms of changes we need to make
to internal JDK code and changes apps will need to make to adapt.
Those that have been tested on OpenJDK should have made those 
adaptations long ago ..

Also although those are some of the most prominent pieces we can't open 
source,
there are other more obscure ones. For example the ICC profile files in 
Oracle JDK
were licensed from Kodak and can't be open sourced. We'll need to switch 
those
to the open source ones, with minor consequences but only to the most colour
sensitive sophisticated apps ..

-phil

On 11/14/2017 07:06 AM, Volker Simonis wrote:
> Hi Dalibor,
>
> the Oracle JDK 9 (downloaded from [1]) still contains the T2K font
> renderer (at least on Linux and Windows):
>
> $ ./jdk-9.0.1/bin/java -version
> java version "9.0.1"
> Java(TM) SE Runtime Environment (build 9.0.1+11)
> Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode)
>
> $ grep -ri T2KFontScaler jdk-9.0.1/
> Binary file jdk-9.0.1/lib/libt2k.so matches
> Binary file jdk-9.0.1/lib/modules matches
> Binary file jdk-9.0.1/jmods/java.desktop.jmod matches
>
> The reference implementation (both versions, the GPL licensed one as
> well as the Oracle Binary Code licensed one, downloaded from [2])
> definitely don't contain the T2K renderer:
>
> $ ./java-se-9-ri-obcl/jdk-9/bin/java -version
> openjdk version "9"
> OpenJDK Runtime Environment (build 9+181)
> OpenJDK 64-Bit Server VM (build 9+181, mixed mode)
>
> $ grep -ri T2KFontScaler ./java-se-9-ri-obcl
> Binary file ./java-se-9-ri-obcl/jdk-9/lib/modules matches
>
> The corresponding switch for enabling T2K for non-OpenJDK builds is
> still in the jdk10 [3] code base:
>
> Class<? extends FontScaler> tmp = (Class<? extends FontScaler>)
>      (FontUtilities.isOpenJDK ?
>       Class.forName("sun.font.FreetypeFontScaler") :
>       Class.forName("sun.font.T2KFontScaler"));
>
> If you're aware of a JBS issue to remove it please post it here.
>
> Another issue which many users of the current Oracle JDK are not aware
> of is that the Oracle JDK contains a set of standard fonts which many
> applications more or less "depend" on:
>
> $ la jdk-9.0.1/lib/fonts/
> total 2052
> -rw-r--r--  1 simonis simonis   4041 Sep 28 05:51 fonts.dir
> -rw-r--r--  1 simonis simonis  75144 Sep 28 05:51 LucidaBrightDemiBold.ttf
> -rw-r--r--  1 simonis simonis  75124 Sep 28 05:51 LucidaBrightDemiItalic.ttf
> -rw-r--r--  1 simonis simonis  80856 Sep 28 05:51 LucidaBrightItalic.ttf
> -rw-r--r--  1 simonis simonis 344908 Sep 28 05:51 LucidaBrightRegular.ttf
> -rw-r--r--  1 simonis simonis 317896 Sep 28 05:51 LucidaSansDemiBold.ttf
> -rw-r--r--  1 simonis simonis 698236 Sep 28 05:51 LucidaSansRegular.ttf
> -rw-r--r--  1 simonis simonis 234068 Sep 28 05:51 LucidaTypewriterBold.ttf
> -rw-r--r--  1 simonis simonis 242700 Sep 28 05:51 LucidaTypewriterRegular.ttf
>
> The OpenJDK binaries don't contain these fonts:
>
> $ la ./java-se-9-ri-obcl/jdk-9/lib/fonts
> ls: cannot access './java-se-9-ri-obcl/jdk-9/lib/fonts': No such file
> or directory
>
> This can be especially problematic on Linux where each distribution
> has its own, potentially different set of standard fonts.
>
> Are there any plans to open-source the aforementioned fonts such that
> they can be added to the OpenJDK and be distributed along with it? Or
> is it clear that the fonts currently shipped with the Oracle JDK will
> never be included into the OpenJDK (e.g. because of licensing issues)?
>
> Regards,
> Volker
>
> [1] http://www.oracle.com/technetwork/java/javase/downloads/jdk9-downloads-3848520.html
> [2] http://jdk.java.net/java-se-ri/9
> [3] http://hg.openjdk.java.net/jdk/jdk/file/94f362b5f4dd/src/java.desktop/share/classes/sun/font/FontScaler.java
>
> On Tue, Nov 14, 2017 at 2:08 PM, dalibor topic <dalibor.topic at oracle.com> wrote:
>>
>> On 14.11.2017 13:56, Mario Torre wrote:
>>
>>>> As https://bugs.openjdk.java.net/browse/JDK-8093768 shows, freetype
>>>> has
>>>> already been the default in Oracle JDK builds for embedded and
>>>> desktop
>>>> Linux & OS X for a couple of years.
>>>
>>> This is also JavaFX, or am I misreading the bug report and target
>>> components?
>>
>> You're right, of course - sorry for the confusion.
>>
>>
>> cheers,
>> dalibor topic
>>
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