Pre-Printed form is the form that already have all the layout designed. What we want is to put data in the form (ie.., SO, Invoice).

There is many report engine in Odoo, i.e., RML, Webkit, QWeb, etc., but none of them seem to be capable of printing in a pre-printed format (which need pixel perfect positioning). The only way I can do it is through iReport (jasper_report).

But given I want to be away from Jasper which is Java. Are there any Odoo's compatible report engine capable of printing in such form?

(The reason I want to be away from Java is becuase it consume memory, and jasper_report seem not to work with multi-processing, https://www.odoo.com/forum/Help-1/question/jasper_reports-not-work-for-multiprocessing-mode---workers-54321)