SECTION 5.6
453
Composite Fonts
KEY
TYPE
VALUE
BaseFont
name
(Required)
The PostScript name of the font. In principle, this is an arbitrary
name, since there is no font program associated directly with a Type 0 font
dictionary. The conventions described here ensure maximum compatibility
with existing Acrobat products.
If the descendant is a Type 0 CIDFont, this name should be the concatenation
of the CIDFont’s
BaseFont
name, a hyphen, and the CMap name given in the
Encoding
entry (or the
CMapName
entry in the CMap). If the descendant is a
Type 2 CIDFont, this name should be the same as the CIDFont’s
BaseFont
name.
Encoding
name or
stream
(Required)
The name of a predefined CMap, or a stream containing a CMap
that maps character codes to font numbers and CIDs. If the descendant is a
Type 2 CIDFont whose associated TrueType font program is not embedded
in the PDF file, the
Encoding
entry must be a predefined CMap name (see
(Required)
A one-element array specifying the CIDFont dictionary that is the
descendant of this Type 0 font.
(Optional)
A stream containing a CMap file that maps character codes to
Unicode values (see Section 5.9, “Extraction of Text Content”).
DescendantFonts
array
stream
ToUnicode
Example 5.11
14 0 obj
<< /Type /Font
/Subtype /Type0
/BaseFont /HeiseiMin−W5−90ms−RKSJ−H
/Encoding /90ms−RKSJ−H
/DescendantFonts [ 15 0 R ]
>>
endobj
CMap Mapping
The
Encoding
entry of a Type 0 font dictionary specifies a CMap that determines
how text-showing operators (such as
Tj
) interpret the bytes in the string to be
shown when the current font is the Type 0 font. The following paragraphs
describe how the characters in the string are decoded and mapped into character
selectors (which in PDF must always be CIDs).