[Cairo] Re: [xsvg] cairo_text_extents ?

John Ellson ellson at research.att.com
Wed Nov 26 07:11:45 PST 2003

Christof Petig wrote:

> IIRC the tuple  x,y,w,h,advancex,advancey clearly covers all 
> information needed for a glyph (advancex/advancey might depend on the 
> next character  (kerning)).
> x/y should equal bearingX/Y (x and y might be negative)

Right, they might be non-zero (positive or negative) w.r.t the x,y of 
the origin.   So, IMHO, naming the coordinates
for the lower-left of the bounding box "x" and "y" can lead to confusion. 

Another issue to be considered is that the text string can be rotated.  
I think that the terms "left-side-bearing" and "right-side-bearing" can 
be more clearly
understood to be parallel to the baseline of the text, and similarly 
"ascent" and "descent"
as perpendicular to the baseline.  

I can see shortening "left-side-bearing" and "right-side-bearing"  to 
"left-bearing" and "right-bearing" if that would help?

Basically we're talking about the same four numbers.  All we're 
discussing is the names.


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