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5.4 Miscellaneous Topics 111

5.4.4 Unicode-compatible Fonts

Precise Unicode semantics are important for PDFlib’s internal processing, and crucial

for properly extracting text from a PDF document, or otherwise reusing the document,

e.g., converting the contents to another format. This is especially important when creat-

ing Tagged PDF which has strict requirements regarding Unicode compliance (see Sec-

tion 9.6.1, »Generating Tagged PDF with PDFlib«, page 216). In addition to Tagged PDF

Unicode compatibility is relevant for the Textflow feature.

Unicode-compatible fonts. A font – more precisely: a combination of font and

encoding – is considered Unicode-compatible if the encoding used for loading the font

complies to all of the following conditions:

>The encoding builtin is only allowed for the Symbol and ZapfDingbats fonts and Post-

Script-based OpenType fonts.

>The encoding is not glyphid.

>If the encoding is one of the predefined CMaps in Table 4.5 it must be one of the UCS2

or UTF16 CMaps.

Unicode-compatible output. If you want to make sure that text can reliably be extract-

ed from the generated PDF, and for generating Tagged PDF the output must be Unicode-

compatible. PDF output created with PDFlib will be Unicode-compatible if all of the fol-

lowing conditions are true:

>All fonts used in the document must be Unicode-compatible as defined above, or use

one of the predefined CMaps in Table 4.5.

>If the encoding has been constructed with PDF_encoding_set_char( ) and glyph names

without corresponding Unicode values, or loaded from an encoding file, all glyph

names must be contained in the Adobe Glyph List or the list of well-known glyph

names in the Symbol font.

>The unicodemap parameter or option is true.

>All text strings must have clearly defined semantics according to the Unicode stan-

dard, i.e. characters from the Private Use Area (PUA) are not allowed.

>PDF pages imported with PDI must be Unicode-compatible. PDI does not change the

Unicode compatibility status of imported pages: it will neither remove nor add Uni-

code information.

When creating Tagged PDF output, text portions which violate these rules can still be

made Unicode-compatible by supplying proper Unicode text with the ActualText option

in PDF_begin_item( ).

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112

Chapter 5: Font Handling

5.5 Font Metrics and Text Variations

5.5.1 Font and Glyph Metrics

Text position. PDFlib maintains the text position independently from the current

point for drawing graphics. While the former can be queried via the textx/texty parame-

ters, the latter can be queried via currentx/currenty.

Glyph metrics. PDFlib uses the glyph and font metrics system used by PostScript and

PDF which shall be briefly discussed here.

The font size which must be specified by PDFlib users is the minimum distance be-

tween adjacent text lines which is required to avoid overlapping character parts. The

font size is generally larger than individual characters in a font, since it spans ascender

and descender, plus possibly additional space between lines.

The leading (line spacing) specifies the vertical distance between the baselines of ad-

jacent lines of text. By default it is set to the value of the font size. The capheight is the

height of capital letters such as T or H in most Latin fonts. The xheight is the height of

lowercase letters such as x in most Latin fonts. The ascender is the height of lowercase

letters such as f or d in most Latin fonts. The descender is the distance from the baseline

to the bottom of lowercase letters such as j or p in most Latin fonts. The descender is

usually negative. The values of xheight, capheight, ascender, and descender are measured

as a fraction of the font size, and must be multiplied with the required font size before

being used.

The gaplen property is only available in TrueType and OpenType fonts (it will be esti-

mated for other font formats). The gaplen value is read from the font file, and specifies

the difference between the recommended distance between baselines and the sum of

ascender and descender.

PDFlib may have to estimate one or more of these values since they are not guaran-

teed to be present in the font or metrics file. In order to find out whether real or estimat-

ed values are used you can call PDF_info_font( ) to query the xheight with the option

faked. The character metrics for a specific font can be queried from PDFlib as follows:

font = p.load_font("Times-Roman", "unicode", "");

capheight = p.info_font(font, "capheight", "");

ascender = p.info_font(font, "ascender", "");

font size

baseline

capheight

descender

ascender

Fig. 5.1 Font and character metrics

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5.5 Font Metrics and Text Variations 113

descender = p.info_font(font, "descender", "");

xheight = p.info_font(font, "xheight", "");

Note The position and size of superscript and subscript cannot be queried from PDFlib.

Cookbook A full code sample can be found in the Cookbook topic fonts/font_metrics_info.

CPI calculations. While most fonts have varying character widths, so-called mono-

spaced fonts use the same widths for all characters. In order to relate PDF font metrics to

the characters per inch (CPI) measurements often used in high-speed print environ-

ments, some calculation examples for the mono-spaced Courier font may be helpful. In

Courier, all characters have a width of 600 units with respect to the full character cell of

1000 units per point (this value can be retrieved from the corresponding AFM metrics

file). For example, with 12 point text all characters will have an absolute width of

12 points * 600/1000 = 7.2 points

with an optimal line spacing of 12 points. Since there are 72 points to an inch, exactly 10

characters of Courier 12 point will fit in an inch. In other words, 12 point Courier is a 10

cpi font. For 10 point text, the character width is 6 points, resulting in a 72/6 = 12 cpi

font. Similarly, 8 point Courier results in 15 cpi.

5.5.2 Kerning

Some character combinations can lead to unpleasant appearance. For example, two Vs

next to each other can look like a W, and the distance between T and e must be reduced

in order to avoid ugly white space. This compensation is referred to as kerning. Many

fonts contain comprehensive kerning tables which contain spacing adjustment values

for certain critical letter pairs. There are two PDFlib controls for the kerning behavior:

>By default, kerning information in a font is not read when loading a font. If kerning

is desired the kerning option must be set in the respective call to PDF_load_font( ).

This instructs PDFlib to read the font’s kerning data (if available).

>When a font for which kerning data has been read is used with any text output func-

tion, the positional corrections provided by the kerning data will be applied. How-

ever, kerning can also be disabled by setting the kerning parameter to false:

p.set_parameter("kerning", "false");

/* disable kerning */

No kerning

Kerning applied

Character movement caused by kerning

Fig. 5.2 Kerning

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114

Chapter 5: Font Handling

Temporarily disabling kerning may be useful, for example, for tabular figures when

the kerning data contains pairs of figures, since kerned figures wouldn’t line up in a

table.

Kerning is applied in addition to any character spacing, word spacing, and horizontal

scaling which may be activated. PDFlib does not have any limit for the number of kern-

ing pairs in a font.

5.5.3 Text Variations

Artificial font styles. Bold and italic variations of a font should normally be created by

choosing an appropriate font. In addition, PDFlib also supports artificial font styles:

based on a regular font Acrobat will simulate bold, italic, or bold-italic styles by embold-

ening or slanting the base font. The aesthetic quality of artificial font styles does not

match that of real bold or italic fonts which have been fine-tuned by the font designer.

However, in situations where a particular font style is not available directly, artificial

styles can be used as a workaround. In particular, artificial font styles are useful for the

standard CJK fonts which support only normal fonts, but not any bold or italic variants.

Note Using the fontstyle feature for fonts other than the standard CJK fonts is not recommended.

Also note that the fontstyle feature may not work in PDF viewers other than Adobe Acrobat.

Due to restrictions in Adobe Acrobat, artificial font styles work only if all of the follow-

ing conditions are met:

>The base font is a TrueType or OpenType font, including standard and custom CJK

fonts. The base font must not be one of the PDF core fonts (see Section 5.3.3, »Font

Embedding«, page 106). Font styles can not be applied to TrueType Collections (TTC).

>The encoding is winansi, macroman, or one of the predefined CJK CMaps listed in Ta-

ble 4.5 (since otherwise PDFlib will force font embedding).

>The embedding option must be set to false.

>The base font must be installed on the target system where the PDF will be viewed.

While PDFlib will check the first three conditions, it is the user’s responsibility to ensure

the last one.

Artificial font styles can be requested by using one of the normal (no change of the

base font), bold, italic, or bolditalic keywords for the fontstyle option of PDF_load_font( ):

font = p.load_font("HeiseiKakuGo-W5", "UniJIS-UCS2-H", "fontstyle bold");

The fontstyle feature should not be confused with the similar concept of Windows font

style names. While fontstyle only works under the conditions above and relies on Acro-

bat for simulating the artificial font style, the Windows style names are entirely based

on the Windows font selection engine and cannot be used to simulate non-existent

styles.

Cookbook A full code sample can be found in the Cookbook topic fonts/artificial_fontstyles.

Simulated bold fonts. While fontstyle feature operates on a font, PDFlib supports an al-

ternate mechanism for creating artificial bold text for individual text strings. This is

controlled by the fakebold parameter or option.

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5.5 Font Metrics and Text Variations 115

Simulated italic fonts. As an alternative to the fontstyle feature the italicangle parame-

ter or option can be used to simulate italic fonts when only a regular font is available.

This method creates a fake italic font by skewing the regular font by a user-provided an-

gle, and does not suffer from the fontstyle restrictions mentioned above. Negative val-

ues will slant the text clockwise. Be warned that using a real italic or oblique font will re-

sult in much more pleasing output. However, if an italic font is not available the

italicangle parameter or option can be used to easily simulate one. This feature may be

especially useful for CJK fonts. Typical values for the italicangle parameter or option are

in the range -12 to -15 degrees.

Note The

italicangle

parameter or option is not supported for vertical writing mode.

Underline, overline, and strikeout text. PDFlib can be instructed to put lines below,

above, or in the middle of text. The stroke width of the bar and its distance from the

baseline are calculated based on the font’s metrics information. In addition, the current

values of the horizontal scaling factor and the text matrix are taken into account when

calculating the width of the bar. The respective parameter names for PDF_set_

parameter( ) can be used to switch the underline, overline, and strikeout feature on or

off, as well as the corresponding options in the text output functions. The underline-

position and underlinewidth parameters and options can be used for fine-tuning.

The current stroke color is used for drawing the bars. The current linecap and dash

parameters are ignored, however. Aesthetics alert: in most fonts underlining will touch

descenders, and overlining will touch diacritical marks atop ascenders.

Cookbook A full code sample can be found in the Cookbook topic text_output/starter_textline.

Text rendering modes. PDFlib supports several rendering modes which affect the ap-

pearance of text. This includes outline text and the ability to use text as a clipping path.

Text can also be rendered invisibly which may be useful for placing text on scanned im-

ages in order to make the text accessible to searching and indexing, while at the same

time assuring it will not be visible directly. The rendering modes are described in the

PDFlib Reference, and can be set with the textrendering parameter or option.

When stroking text, graphics state parameters such as linewidth and color will be ap-

plied to the glyph outline. The rendering mode has no effect on text displayed using a

Type 3 font.

Note Text rendering mode 7 (use text as clipping path) will not have any effect when creating text

output with PDF_fit_textline( ) or PDF_fit_textflow( ).

Cookbook Full code samples can be found in the Cookbook topics text_output/text_as_clipping_path

and text_output/invisible_text.

Text color. Text will usually be display in the current fill color, which can be set using

PDF_setcolor( ). However, if a rendering mode other than 0 has been selected, both stroke

and fill color may affect the text depending on the selected rendering mode.

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116

Chapter 5: Font Handling

5.6 Chinese, Japanese, and Korean Fonts

5.6.1 Standard CJK Fonts

Acrobat supports various standard fonts for CJK text. These fonts are supplied with the

Acrobat installation (or the Asian FontPack), and therefore don’t have to be embedded

in the PDF file. These fonts contain all characters required for common encodings, and

support both horizontal and vertical writing modes. The standard fonts are listed in Ta-

ble 5.2 along with applicable CMaps (see Section 4.5, »Encodings for Chinese, Japanese,

and Korean Text«, page 85, for more details on CJK CMaps).

Note Acrobat’s standard CJK fonts do not support bold and italic variations. However, these can be

simulated with the artificial font style feature (see Section 5.5.3, »Text Variations«, page 114).

Table 5.2 Acrobat’s standard fonts and CMaps (encodings) for Japanese, Chinese, and Korean text

locale

font name

sample

supported CMaps (encodings)

Simplified

Chinese

STSong-Light

STSongStd-Light-Acro

AdobeSongStd-Light-Acro

AdobeSongStd-Light

1. Available in Acrobat 4; Acrobat 5 and 6 will substitute these with different fonts.

2. Available in Acrobat 5 only

3. Available in Acrobat 6 only

GB-EUC-H, GB-EUC-V, GBpc-EUC-H, GBpc-EUC-V,

GBK-EUC-H, GBK-EUC-V, GBKp-EUC-H

, GBKp-EUC-

, GBK2K-H

, GBK2K-V

, UniGB-UCS2-H, UniGB-

UCS2-V, UniGB-UTF16-H

, UniGB-UTF16-V

4. Only available when generating PDF 1.4 or above

5. Only available when generating PDF 1.5 or above

Traditional

Chinese

MHei-Medium

MSung-Light

MSungStd-Light-Acro

AdobeMingStd-Light-Acro

AdobeMingStd-Light

B5pc-H, B5pc-V, HKscs-B5-H

, HKscs-B5-V

, ETen-B5-

H, ETen-B5-V, ETenms-B5-H, ETenms-B5-V, CNS-

EUC-H, CNS-EUC-V, UniCNS-UCS2-H, UniCNS-UCS2-

V, UniCNS-UTF16-H

, UniCNS-UTF16-V

Japanese

HeiseiKakuGo-W5

HeiseiMin-W3

KozMinPro-Regular-Acro

2, 7

KozGoPro-Medium-Acro

3, 7

KozGoPro-Medium

KozMinProVI-Regular

6. Only available when generating PDF 1.6 or above

83pv-RKSJ-H, 90ms-RKSJ-H, 90ms-RKSJ-V, 90msp-

RKSJ-H, 90msp-RKSJ-V, 90pv-RKSJ-H, Add-RKSJ-H,

Add-RKSJ-V, EUC-H, EUC-V, Ext-RKSJ-H, Ext-RKSJ-V,

H, V, UniJIS-UCS2-H, UniJIS-UCS2-V, UniJIS-UCS2-

HW-H

, UniJIS-UCS2-HW-V

, UniJIS-UTF16-H

, Un-

iJIS-UTF16-V

7. The HW CMaps are not allowed for the KozMinPro-Regular-Acro and KozGoPro-Medium-Acro fonts because these fonts contain only

proportional ASCII characters, but not any halfwidth forms.

Korean

HYGoThic-Medium

HYSMyeongJo-Medium

HYSMyeongJoStd-Medium-Acro

AdobeMyungjoStd-Medium-Acro

AdobeMyungjoStd-Medium

KSC-EUC-H, KSC-EUC-V, KSCms-UHC-H, KSCms-

UHC-V, KSCms-UHC-HW-H, KSCms-UHC-HW-V,

KSCpc-EUC-H, UniKS-UCS2-H, UniKS-UCS2-V, Un-

iKS-UTF16-H

, UniKS-UTF16-V

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5.6 Chinese, Japanese, and Korean Fonts 117

Horizontal and vertical writing mode. PDFlib supports both horizontal and vertical

writing modes. For standard CJK fonts and CMaps the writing mode is selected along

with the encoding by choosing the appropriate CMap name. CMaps with names ending

in -H select horizontal writing mode, while the -V suffix selects vertical writing mode.

Fonts with encodings other than a CMap can be used for vertical writing mode by sup-

plying the vertical option to PDF_load_font( ). Font names starting with an @ character

will always be processed in vertical mode.

Note Some PDFlib functions change their semantics according to the writing mode. For example,

PDF_continue_text( ) should not be used in vertical writing mode, and the character spacing

must be negative in order to spread characters apart in vertical writing mode.

Standard CJK font example. Standard CJK fonts can be selected with the PDF_load_

font( ) interface, supplying the CMap name as the encoding parameter. However, you

must take into account that a given CJK font supports only a certain set of CMaps (see

Table 5.2), and that Unicode-aware language bindings support only UCS2-compatible

CMaps. The KozMinPro-Regular-Acro sample in Table 5.2 can been generated with the fol-

lowing code:

font = p.load_font("KozMinPro-Regular-Acro", "UniJIS-UCS2-H", "");

if (font == -1) { ... }

p.setfont(font, 24);

p.set_text_pos(50, 500);

p.show("\u65E5\u672C\u8A9E");

These statements locate one of the Japanese standard fonts, choosing a Shift-JIS-com-

patible CMap (Ext-RKSJ) and horizontal writing mode (H). The fontname parameter must

be the exact name of the font without any encoding or writing mode suffixes. The

encoding parameter is the name of one of the supported CMaps (the choice depends on

the font) and will also indicate the writing mode (see above). PDFlib supports all of Acro-

bat’s default CMaps, and will complain when it detects a mismatch between the re-

quested font and the CMap. For example, PDFlib will reject a request to use a Korean

font with a Japanese encoding.

Forcing monospaced fonts. Some applications are not prepared to deal with propor-

tional CJK fonts, and calculate the extent of text based on a constant glyph width and

the number of glyphs. PDFlib can be instructed to force monospaced glyphs even for

fonts that usually have glyphs with varying widths. Use the monospace option of PDF_

load_font( ) to specify the desired width for all glyphs. For standard CJK fonts the value

1000 will result in pleasing results:

font = p.load_font("KozMinPro-Regular-Acro", "UniJIS-UCS2-H", "monospace=1000");

The monospace option is only recommended for standard CJK fonts.

5.6.2 Custom CJK Fonts

In addition to Acrobat’s standard CJK fonts PDFlib supports custom CJK fonts (fonts out-

side the list in Table 5.2) in the TrueType (including TrueType Collections, TTC) and

OpenType formats. Custom CJK fonts will be processed as follows:

>If the embedding option is true, the font will be converted to a CID font and embed-

ded in the PDF output.

118

Chapter 5: Font Handling

>CJK host font names on Windows can be supplied to PDF_load_font( ) as UTF-8 with

initial BOM, or UTF-16. Non-Latin host font names are not supported on the Mac,

though.

>Treatment of non-Unicode CMaps: if the keepnative option is true, native codes (e.g.

Shift-JIS) will be written to the PDF output; otherwise the text will be converted to

Unicode. The visual appearance will be identical in both cases, but this option affects

the use of such fonts for Textflow and form fields (see description of keepnative in

the PDFlib Reference). In order to avoid subtle problems in Acrobat we recommend

to set keepnative=false if no font embedding is desired, and to set embedding=true if

keepnative=true is desired.

Note Windows EUDC fonts (end-user defined characters) are supported, but linking individual end-

user defined characters into all fonts is not supported (see »End-user defined characters

(EUDC)«, page 119).

Custom CJK font example with Japanese Shift-JIS text. The following C example uses

the MS Mincho font to display some Japanese text which is supplied in Shift-JIS format

according to Windows code page 932:

font = PDF_load_font(p, "MS Mincho", 0, "cp932", "");

if (font == -1) { ... }

PDF_setfont(p, font, 24);

PDF_set_text_pos(p, 50, 500);

PDF_show2(p, "\x82\xA9\x82\xC8\x8A\xBF\x8E\x9A", 8);

Custom CJK font example with Chinese Unicode text. The following example uses the

ArialUnicodeMS font to display some Chinese text. The font must either be installed on

the system or must be configured according to Section 5.3.1, »Searching for Fonts«, page

101):

font = p.load_font("Arial Unicode MS", "unicode", "");

p.setfont(font, 24);

p.set_text_pos(50, 500);

p.show("\u4e00\u500b\u4eba");

Accessing individual fonts in a TrueType Collection (TTC). TTC files contain multiple

separate fonts. You can access each font by supplying its proper name. However, if you

don’t know which fonts are contained in a TTC file you can numerically address each

font by appending a colon character and the number of the font within the TTC file

(starting with 0). If the index is 0 it can be omitted. For example, the TTC file msgothic.ttc

contains multiple fonts which can be addressed as follows in PDF_load_font( ) (each line

contains equivalent font names):

msgothic:0

MS Gothic

msgothic:

msgothic:1

MS PGothic

msgothic:2

MS UI Gothic

Note that msgothic (without any suffix) will not work as a font name since it does not

uniquely identify a font. Font name aliases (see Section , »Sources of Font Data«, page

5.6 Chinese, Japanese, and Korean Fonts 119

101) can be used in combination with TTC indexing. If a font with the specified index

cannot be found, the function call will fail.

It is only required to configure the TTC font file once; all indexed fonts in the TTC file

will be found automatically. The following code is sufficient to configure all indexed

fonts in msgothic.ttc (see Section 5.3.1, »Searching for Fonts«, page 101):

p.set_parameter("FontOutline", "msgothic=msgothic.ttc");

End-user defined characters (EUDC). PDFlib does not support linking end-user defined

characters into fonts, but you can use the EUDC editor available in Windows to create

custom characters for use with PDFlib. Proceed as follows:

>Use the eudcedit.exe to create one or more custom characters at the desired Unicode

position(s).

>Locate the EUDC.TTE file in the directory \Windows\fonts and copy it to some other di-

rectory. Since this file is invisible in Windows Explorer use the dir and copy com-

mands in a DOS box to find the file. Now configure the font for use with PDFlib, us-

ing one of the methods discussed in (see Section 5.3.1, »Searching for Fonts«, page

101):

p.set_parameter("FontOutline", "EUDC=EUDC.TTE");

p.set_parameter("SearchPath", "...directory name...");

or place EUDC.TTE in the current directory.

>As an alternative to the preceding step you can use the following function call to

configure the font file directly from the Windows directory. This way you will always

access the current EUDC font used in Windows:

p.set_parameter("FontOutline", "EUDC=C:\Windows\fonts\EUDC.TTE");

>Use the following call to load the font:

font = p.load_font("EUDC", "unicode", "");

and supply the Unicode character codes chosen in the first step to output the charac-

ters.

120

Chapter 5: Font Handling

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