Sunday, May 19, 2013

[android-developers] rendering international text into GL texture with correct line breaks

Hello,

I'm looking into localising an OpenGL app into several languages.  I'm not too worried about short strings like button labels, however the welcome screen contains a paragraph or two of text and the tutorial has a couple of 2-3 lines text strings.  Currently, they are pre-rendered and distributed as PNGs but ideally, they should be rendered on-the-fly to save texture space and avoid scaled text.

To achieve that, it seems necessary to handle line breaking properly.  However, I couldn't find an API in Android to help with that.  I'm aware of Paint.breakText() but it seems too primitive for the task - it actually doesn't seem to handle proper line breaking at all.  For Western languages, it should be mostly fine just to back off to the first space from what breakText() returns and break the line there.  The problem is how to deal with Asian languages (Chinese, Japanese and Korean - also Thai would be nice), and later on with RTL languages, too.

Some googling gave me the impression that in general, people like me shouldn't try to tackle the problem themselves - it's too complex and belongs into an operating system/application framework anyway.

Is there something in Android platform to help turn a paragraph of text into a decent PNG of specified dimensions?

Thanks in advance!

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