[PATCH 2/2] gdi32: Clip font glyphs to fit within text metrics.

Sam Edwards cfsworks at gmail.com
Mon Apr 22 18:40:48 CDT 2013

On 04/19/2013 10:32 AM, Max TenEyck Woodbury wrote:
> As I understand it, some fonts deliberately have glyphs larger than
> their metrics bounding boxes.  Clipping them is almost certainly not a
> good idea.

Forgive my disbelief, but can you provide an example? It seems like 
Windows has the same clipping behavior (see my test 

 From my understanding, the intent of the ascent metric is that it 
indicates the maximum ascender on any glyph in the font (and likewise 
for descent), so the only real reason for the ascent/descent metrics to 
be wrong is if the font designer made a mistake. (And some tools, like 
FontForge, will automatically set the ascent/descent metrics correctly 
for you on export.)

I can't think of any reason why a font author would want to create a 
font with an invalid ascent/descent metric.
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