[cairo] pango+cairo how to get position of each character?

[mhao1999 at live.cn]

For example, I have a text string "hello" and a truetype font file, and I want to apply different color to different character, currently I cannot find a way to implement it.

My thought is:
first get each position of each character from pango/cairo, then if no api to render one by one, I can use freetype library to render each glyph, does it work?

Thanks for any idea.
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