DLI Implementation and Reference Guide - Datalogics

4.6 DLI Implementation and Reference Guide
Font Creation Calls
Concepts and Facilities: Guide to the DL Pager Composition System
There are several procedures available for creating a DLPDFFONT structure:
• dlpdffontcreate
• dlpdffontcreateembedded
• dlpdffontcreatewithmetrics
• dlpdffontcreatewithmetricsembedded
All of these calls create the DLPDFFONT structure described above. They are listed in
increasing order of control given over font characteristics, and according to the
amount of information a user is required to have about a given font. Those near the
top of the list above require less initial information from the user than those further
down.
The dlpdffontcreatewithmetrics and
dlpdffontcreatewithmetricsembedded calls can be used to modify the
character width table and the character encoding vector array, as well as all the font
attributes which are reflected in the PDEFontAttrs structure these calls require.
Repetitive Font Creation Calls
A DLPDFDOC maintains a list of defined fonts by the name and font attributes
requested. Second and subsequent calls to create a font structure of a given name and
attributes will return the same font structure as the first call. For example, if you ask
for the Type1 font Baskerville 20 times, with the same attributes every time, only a
single PDF font structure for Baskerville will be created, and only a single
DLPDFFONT structure will be created for Baskerville. If these requests supply differing
font attributes, more than one copy of Baskerville is created.
NOTE: The dlpdffontcreate family of calls will always allow the creation of
the Adobe standard type 1 fonts. The names of these 14 fonts (sometimes referred
to as the Base 14 fonts) can be found in the PDF Reference.