Adding advanced typography capability #297

[codecracker2014]

So far OpenPDF doesn't support advanced typography features like processing of GSUB table. Good documentation for typography is available at following link https://docs.microsoft.com/en-us/typography/opentype/spec/, https://docs.microsoft.com/en-us/typography/opentype/spec/gsub

Apache FOP supports advanced typography(https://xmlgraphics.apache.org/fop/1.1/releaseNotes_1.1.html) and is pretty stable. I've added support of advanced typography by utilizing Apache FOP. With this change OpenPDF will be supporting TrueTypeFonts and advanced typography.

[asturio]

@codecracker2014 Do you have a sample, using this new advances typography? This would be very nice.

[andreasrosdal]

Dependencies needs to be implemented to be optional.
Please also add unit tests.

[codecracker2014]

@andreasrosdal thanks for review, i'll update soon.

[codecracker2014]

@codecracker2014 Do you have a sample, using this new advances typography? This would be very nice.

@asturio junit test would be fine?

[asturio]

@codecracker2014 Do you have a sample, using this new advances typography? This would be very nice.

@asturio junit test would be fine?

Yeah, junit is fine.

[asturio]

Please:

• move new dependencies above of dependencies with test-scope
• set new dependencies as optional
• add some junit test for the new feature

[andreasrosdal]

Will OpenPDF still work correctly, compile and run without crashing, when these optional dependencies are not present?

[codecracker2014]

@andreasrosdal i thought optional dependency is to be marked just to avoid version conflicts. If it is required to make this feature optional then this needs to be handled in code.

[andreasrosdal]

Yes, I think this feature should be optional, if possible. So that OpenPDF can be used without requiring these extra two dependencies.

Users of OpenPDF don't want extra dependencies which are required, since it can cause dependency hell.

[andreasrosdal]

Needs to be optional. OpenPDF must still work without this.

[codecracker2014]

@andreasrosdal I've made this feature optional based on presence of Fop on classpath.

[codecracker2014]

@asturio I've added unit test for typography please review.
For hindi i've used jaldi font(https://github.com/Omnibus-Type/Jaldi) which is having OFL 1.1 license(SIL Open Font License 1.1).

[codecracker2014]

I've updated wiki for this feature have a look https://github.com/LibrePDF/OpenPDF/wiki/Multi-byte-character-language-support-with-TTF-fonts