gdkFontLoad(font.name)
gdkFontLoadForDisplay(display, font.name)
gdkFontLoadForDisplay(display, font.name)
gdkFontsetLoad(fontset.name)
gdkFontsetLoadForDisplay(display, fontset.name)
gdkFontsetLoadForDisplay(display, fontset.name)
gdkFontFromDescription(font.desc)
gdkFontFromDescriptionForDisplay(display, font.desc)
gdkFontFromDescriptionForDisplay(display, font.desc)
gdkFontGetDisplay(object)
gdkFontGetDisplay(object)
gdkFontId(object)
gdkStringExtents(object, string)
gdkTextExtents(object, string)
gdkTextExtentsWc(object, text)
gdkStringWidth(object, string)
gdkTextWidth(object, text, text.length = -1)
gdkTextWidthWc(object, text)
gdkCharWidth(object, character)
gdkCharWidthWc(object, character)
gdkStringMeasure(object, string)
gdkTextMeasure(object, text, text.length = -1)
gdkCharMeasure(object, character)
gdkStringHeight(object, string)
gdkTextHeight(object, text, text.length = -1)
gdkCharHeight(object, character)GdkFont data type represents a font for drawing on
the screen. These functions provide support for
loading fonts, and also for determining the dimensions
of characters and strings when drawn with a particular
font. Fonts in X are specified by a
X Logical Font Description.
The following description is considerably simplified.
For definitive information about XLFD's see the
X reference documentation. A X Logical Font Description (XLFD)
consists of a sequence of fields separated (and surrounded by) '-'
characters. For example, Adobe Helvetica Bold 12 pt, has the
full description:
"-adobe-helvetica-bold-r-normal--12-120-75-75-p-70-iso8859-1"The fields in the XLFD are:
| Foundry |
| the company or organization where the font originated. |
| Family |
| the font family (a group of related font designs). |
| Weight |
| A name for the font's typographic weight For example, 'bold' or 'medium'). |
| Slant |
| The slant of the font. Common values are 'R' for Roman, 'I' for italoc, and 'O' for oblique. |
| Set Width |
| A name for the width of the font. For example, 'normal' or 'condensed'. |
| Add Style |
| Additional information to distinguish a font from other fonts of the same family. |
| Pixel Size |
| The body size of the font in pixels. |
| Point Size |
| The body size of the font in 10ths of a point. (A point is 1/72.27 inch) |
| Resolution X |
| The horizontal resolution that the font was designed for. |
| Resolution Y |
| The vertical resolution that the font was designed for . |
| Spacing |
| The type of spacing for the font - can be 'p' for proportional, 'm' for monospaced or 'c' for charcell. |
| Average Width |
| The average width of a glyph in the font. For monospaced and charcell fonts, all glyphs in the font have this width |
| Charset Registry |
| The registration authority that owns the encoding for the font. Together with the Charset Encoding field, this defines the character set for the font. |
| Charset Encoding |
| An identifier for the particular character set encoding. |
"-*-helvetica-bold-r-normal--*-120-*-*-*-*-iso8859-1"It is generally a good idea to use wildcards for any portion of the XLFD that your program does not care about specifically, since that will improve the chances of finding a matching font. A fontset is a list of fonts that is used for drawing international text that may contain characters from a number of different character sets. It is represented by a list of XLFD's. The font for a given character set is determined by going through the list of XLFD's in order. For each one, if the registry and and encoding fields match the desired character set, then that font is used, otherwise if the XLFD contains wild-cards for the registry and encoding fields, the registry and encoding for the desired character set are substituted in and a lookup is done. If a match is found that font is used. Otherwise, processing continues on to the next font in the list. The functions for determining the metrics of a string come in several varieties that can take a number of forms of string input:
gdkStringWidth that
take a character, if the font is of type
GDK_FONT_FONT and is an 8-bit font, then each
character indexes the glyphs in the font directly.
character, if the
font is of type GDK_FONT_FONT, and is a 16-bit
font, then the character argument is
interpreted as a integer cast to
a character and each integer
indexes the glyphs in the font directly.
character, if the
font is of type GDK_FONT_FONTSET, then the input
string is interpreted as a multibyte
encoded according to the current locale. (A multibyte
string is one in which each character may consist
of one or more bytes, with different lengths for different
characters in the string). They can be converted to and
from wide character strings (see below) using
gdkWcstombs() and gdkMbstowcs().) The string will
be rendered using one or more different fonts from
the fontset.
gdkTextWidthWc) which
takes a numeric instead of a
character. The input is then taken to
be a wide character string in the encoding of the
current locale. (A wide character string is a string
in which each character consists of several bytes,
and the width of each character in the string is
constant.)