> SDL_TTF doesn't break lines on Chinese punctuation characters (.,;:!?)
Those aren't Chinese punctuation characters. Chinese punctuation characters are full-width, including the spacing that should follow them (or in the case of "(", precede) within the glyph itself: （。，；：！？）. (You may also notice that the period is radically different.) Chinese text should almost never include space characters.
Chinese applications seem happy to break lines anywhere including in the middle of a word, but punctuation seems like an especially good place for a line break, so I'm confused why SDL_TTF would go out of its way to avoid breaking there.
Those aren't Chinese punctuation characters. Chinese punctuation characters are full-width, including the spacing that should follow them (or in the case of "(", precede) within the glyph itself: （。，；：！？）. (You may also notice that the period is radically different.) Chinese text should almost never include space characters.
Chinese applications seem happy to break lines anywhere including in the middle of a word, but punctuation seems like an especially good place for a line break, so I'm confused why SDL_TTF would go out of its way to avoid breaking there.