[NTG-pdftex] [ pdftex-Bugs-810 ] Mixed up font descriptor from pdf inclusion

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Bugs item #810, was opened at 2007-06-22 13:49
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Category: Fonts
Group: v1.40.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Martin Schröder (oneiros)
Assigned to: The Thanh Han (hanthethanh)
Summary: Mixed up font descriptor from pdf inclusion

Initial Comment:
Ulrich Dirr reported a bug with pdf inclusion where
font information is not copied correctly (see
http://tug.org/pipermail/pdftex/2007-June/007197.html).

Thanh analysed thus:

the issue with "Strange problems with graphics inclusion"
has the following reason :

- CMSS10 is used in a pdf figure (let's call it f1.pdf)

- that f1.pdf is included in another pdf (eg f2.pdf)

- when f2.pdf includes f1.pdf and a map entry for CMSS10 is
 avail., a font descriptor for CMSS10 is created by
 epdf_create_fontdescriptor()

- the preset_fontmetrics() function is not called for
CMSS10
 (it's there in epdf_create_fontdescriptor(), but commented
 out -- no f to use with preset_fontmetrics() there)

- when pdftex writes out the font descriptor for CMSS10,
 some font metrics are not set, since CMSS10.pfb doesn't
 have them

- so f2.pdf ends up with a font descriptor for CMSS10 where
 some font metrics are missing (Ascent, CapHeight, XHeight
 etc.)

- f2.pdf seems to be ok with most pdf browser, but not with
 Preflight in Acrobat7 (and perhaps with PitStop -- I don't
 have PitStop to test)

A patch by Thanh is attached.

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