[cairo] how to get text size ?

[Adrian Johnson]

On 09/07/16 22:18, Enrico Weigelt, metux IT consult wrote:
> But I'm still struggling w/ the exact meaning of y_bearing ...

Looking at the diagram below, the rectangle is the extents of the glyph.
In this example think of something like a 'g' where most of it is above
the origin but a bit is below. In cairo the positive Y axis is down. The
y bearing is the distance from the origin to the top of the extents. In
this example the y bearing is negative as the top of the extents is on
the negative Y side of the origin.


  x      --------  ^
bearing  |      |  |y bearing (negative value)
  ------>|      |  |
         |      |  |
  o------|------|-----> X-axis
  |      --------
  |
  |
  |
  V

 Y-axis