i am sorry i answer in English. But it is good for u to learn linux.
firefly patch solved the problem for Chinese bold font of XFT2 engine.
Italic fonts support in natively supported by XFT2.
Other patches, like bytecode interpretor(better AA fonts), is just a switch to turn on the compile time options.
One of the patch tried to modify the gamma value of XFT2 fonts(supposed to be better font display, but I don't think so and turned it off in fonts.conf).