PDFlib Text Extraction Toolkit (TET) Manual

Table 10.15 Members of the TET_char_info structure (C, C++, Ruby), equivalent public fields (Java, PHP, Objective-C), keys
(Perl) or properties (COM and .NET) with their type and meaning. See »Glyph metrics«, page 74, and Figure 6.3 for more
details.
property/
field name
attributes 1
unknown
explanation
(Integer) Glyph attributes expressed as bits which can be combined:
bit 0 Geometric or semantic subscript
bit 1 Geometric or semantic superscript
bit 2 Drop cap character (initial large character at the start of a paragraph)
bit 3 Glyph- or word-based shadow duplicate of this glyph has been removed
bit 4 Glyph represents last character before hyphenation point
bit 5 Hyphenation artifact (i.e. the hyphen character) which was removed unless
contentanalysis={keephyphenglyphs=true} was specified.
bit 6 Glyph represents the character after hyphenation point
(Boolean, in C, C++ and Perl: integer) Usually false (0), but will be true (1) if the original glyph could not
be mapped to Unicode and has been replaced with the character specified as unknownchar.
x, y (Double) Position of the glyph’s reference point. The reference point is the lower left corner of the glyph
box for horizontal writing mode, and the top center point for vertical writing mode. For artificial characters
the x, y coordinates will be those of the end point of the most recent real character.
width
alpha
beta
fontid
fontsize
textrendering
(Double) Width of the corresponding glyph (for both horizontal and vertical writing mode). For artificial
characters (i.e. inserted separators with type=12 and hyphenation artifacts with attribute bit 5 set) the
width is 0.
(Double) Direction of inline text progression in degrees measured counter-clockwise (or clockwise for topdown
coordinates). For horizontal writing mode this is the direction of the text baseline; for vertical writing
mode it is the digression from the standard vertical direction. The angle will be in the range
-180° < alpha ³ +180°. For standard horizontal text as well as for standard text in vertical writing mode
the angle will be 0°.
(Double) Text slanting angle in degrees measured counter-clockwise (or clockwise for topdown coordinates),
relative to the perpendicular of alpha. The angle will be 0° for upright text, and negative for italicized
(slanted) text (positive for topdown coordinates). The angle will be in the range -180° < beta ³ 180°,
but different from ±90°. If abs(beta) > 90° the text is mirrored at the baseline.
(Integer) Index of the font in the fonts[] pseudo object (see the pCOS Path Reference). fontid is never
negative.
(Double) Size of the font (always positive); the relation of this value to the actual height of glyphs is not
fixed, but may vary with the font design. For most fonts the font size is chosen such that it encompasses
all ascenders (including accented characters) and descenders.
(Integer) Text rendering mode:
0 fill text
1 stroke text (outline)
2 fill and stroke text
3 invisible text (often used for OCR results)
4 fill text and add it to the clipping path
5 stroke text and add it to the clipping path
6 fill and stroke text and add it to the clipping path
7 add text to the clipping path
1. In the REALbasic binding this field is called attrs.
180 Chapter 10: TET Library API Reference