Pango font metric discrepency

[nerdy <nerds_ebook1 yahoo com>]

Hello,

I would like to know why there is a difference in the font metrics between simillar fonts in windows and linux. For example for arial font of size 34, the ascent, descent and char width has values of 32, 7 and 9 respectively in windows MFC . But when using gtk pango, the values are  43, 13 and 13 respectively. Why is there a discrepency in the metrics of a similar font. Note that I am using same ttf file in both windows and linux. 

In windows , I am extracting the metric information using MFC API.
In linux, I am extracting the metric information using pango_font_metrics_get_ascent, pango_font_metrics_get_descent functions.

Thanks and regards,
nerdy

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