[Devel] ink metrics

[Francesco Zappa Nardelli]

Hello.

Extract of an old letter to address@hidden  Keith Packard writing.

KP> [..]  I'm sorry, but about 11 years ago I noticed some wording in
KP> the protocol spec which said that the bounding box information
KP> reported in the protocol measured the extent of the actual ink for
KP> each glyph.

KP> That meant that bounding boxes needed to be exactly fitted around
KP> the glyph and meant that there were no longer any constant metric
KP> fonts -- a full stop is usually smaller than a capital W...

KP> This lead to the duplication of metric data in terminal fonts; the
KP> 'bitmap' metrics which measured the extents of the glyph bitmaps
KP> and the 'ink' metrics measuring the extent of the ink within that
KP> bitmap.

Could somebody show me an application of ink metrics?  I would be
extremely grateful.

Currently, the PCF driver ignores ink metrics.  I will make them
accessible by defining a flag PCF_LOAD_INK_METRICS: invoking
Load_Glyph with this flag set will result in getting glyph metrics
from the /ink_metrics/ table rather than the /metrics/ table.  

Any comments?

-francesco