CHAPTER 5
452
Text
•
usefont
specifies a font number that is an implicit operand of all the character
code mapping operations that follow. In PDF, the font number must be 0;
therefore,
usefont
typically does not actually appear.
•
beginbfchar
and
endbfchar
define mappings of individual input character
codes to character codes or character names in the associated font.
beginbfrange
and
endbfrange
do the same for ranges of input codes. In PDF,
these operators may not appear in a CMap that is used as the
Encoding
entry of
a Type 0 font; however, they may appear in the definition of a
ToUnicode
CMap
(see Section 5.9, “Extraction of Text Content”).
•
begincidchar
and
endcidchar
define mappings of individual input character
codes to CIDs in the associated CIDFont.
begincidrange
and
endcidrange
do
the same, but for ranges of input codes.
•
beginnotdefchar,
endnotdefchar
,
beginnotdefrange,
and
endnotdefrange
define notdef mappings from character codes to CIDs. As described in the
section “Handling Undefined Characters” on page 454, a notdef mapping is
used if the normal mapping produces a CID for which no glyph is present in
the associated CIDFont.
beginrearrangedfont
,
endrearrangedfont
,
beginusematrix
,
and
endusematrix
operators, described in Adobe Technical Note #5014,
Adobe CMap
The
and CIDFont Files Specification,
cannot be used in CMap files embedded in a
PDF file.
5.6.5 Type 0 Font Dictionaries
A Type 0 font dictionary contains the entries listed in Table 5.18.
is one of the predefined CMaps listed in Table 5.15 on page 442 and is referenced
by name.
TABLE 5.18 Entries in a Type 0 font dictionary
KEY
TYPE
VALUE
Type
name
name
(Required)
The type of PDF object that this dictionary describes; must be
Font
for a font dictionary.
(Required)
The type of font; must be
Type0
for a Type 0 font.
Subtype