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| -rw-r--r-- | libparsepcf_get_properties.3 | 180 |
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diff --git a/libparsepcf_get_properties.3 b/libparsepcf_get_properties.3 new file mode 100644 index 0000000..366b07f --- /dev/null +++ b/libparsepcf_get_properties.3 @@ -0,0 +1,180 @@ +.TH LIBPARSEPCF_GET_PROPERTIES 3 LIBPARSEPCF +.SH NAME +libparsepcf_get_properties \- Get font properties + +.SH SYNOPSIS +.nf +#include <libparsepcf.h> + +#define LIBPARSEPCF_PROPERTIES /* value omitted */ + +struct libparsepcf_properties { + size_t \fIproperty_count\fP; + /* fields intended for internal use omitted */ +}; + +struct libparsepcf_property_subtable { + const char *\fIname\fP; + int \fIis_string_property\fP; + union { + int32_t \fIsigned_value\fP; + const char *\fIstring_value\fP; + } \fIvalue\fP; +}; + +int libparsepcf_get_properties(const void *\fIdata\fP, size_t \fIsize\fP, + const struct libparsepcf_table *\fItable\fP, + struct libparsepcf_properties *\fImeta_out\fP); + +int libparsepcf_get_property_subtable(const void *\fIdata\fP, size_t \fIsize\fP, + const struct libparsepcf_table *\fItable\fP, + const struct libparsepcf_properties *\fImeta\fP, + struct libparsepcf_property_subtable *\fIprops\fP, + size_t \fIfirst\fP, size_t \fIcount\fP); +.fi +.PP +Link with +.IR -lparsepcf . + +.SH DESCRIPTION +A PCF font files should record font +properties in the table with the type +.B LIBPARSEPCF_PROPERTIES +which can be retrieved with the +.BR libparsepcf_get_tables (3) +function. +.PP +Once the +.B LIBPARSEPCF_PROPERTIES +table has been identified, it can be passed as +the third argument +.RI ( table ) +to the +.BR libparsepcf_get_properties () +function along with the font file contents in the +.I data +argument and size, in bytes, of the file in the +.I size +argument. The +.BR libparsepcf_get_properties () +function will store the number of available +properties in +.IR meta_out->property_count , +as well as internal information needed by the +.BR libparsepcf_get_property_subtable () +function in other fields in +.IR *meta_out . +.PP +Then the +.BR libparsepcf_get_property_subtable () +function can be used to get each font property. +The first four arguments shall be +the same as with +.BR libparsepcf_get_properties (). +.I first +shall be the index of the property with the lowest +index of the property the function shall get, and +.I count +shall be the number of consecutive properties +(including the first properties) to get. For each +queried properties with index +.IR i , +the property name will be stored in +.I props[i]->name +and the property value will be stored in +.I props[i]->value.signed_value +it it is numerical and in +.I props[i]->value.string_value +if it is a textual. In the former case +.I props[i]->is_string_property +will be set to 0 and in the latter case +.I props[i]->is_string_property +will be set to 1. +.PP +The application shall ensure that +.IR "first + count <= meta->property_count" . + +.SH RETURN VALUE +The +.BR libparsepcf_get_properties () +and +.BR libparsepcf_get_property_subtable () +functions return 0 upon successful completion. +On failure, -1 is returned and +.I errno +is set appropriately to indicate the error. + +.SH ERRORS +The +.BR libparsepcf_get_properties () +and +.BR libparsepcf_get_property_subtable () +functions fail if: +.TP +.B EBFONT +The font file is corrupt or unsupported. + +.SH EXTENDED DESCRIPTION +For X fonts, the file will some of the properties +listing in +.IR https://www.x.org/releases/X11R7.7/doc/xorg-docs/xlfd/xlfd.html . +Particularly important fields are: +.TP +.B FAMILY_NAME +The name of the font. Note that the name is not +necessarily unique, but must be combined with other +identification properties to unique identify the +font or font family. +.TP +.B FONT +X Logical Font Descriptor. This uniquely identifies +the the font and some of its properties. +.TP +.B SLANT +The font's slant style. Common values are +\(dqR\(dq for roman, \(dqI\(dq for italic, and +\(dqO\(dq for oblique. +.TP +.B ADD_STYLE_NAME +The font's style, apart from slant style. Common +values are \(dqSerif\(dq, \(dqSans Serif\(dq, and +\(dq\(dq. +.TP +.B SPACING +The font's width-variableness, \(dqP\(dq for +proportional, \(dqM\(dq for monospaced, and +\(dqC\(dq for character-cell (monospaced font that +follows the standard typewriter character cell model). +.TP +.B AVERAGE_WIDTH +Mostly useful for character-cell types, where it +specifies the cell width in decipixels. +.TP +.B PIXEL_SIZE +The height of the font in pixels. +.TP +.B CAP_HEIGHT +The nominal height of majuscule letters in pixels. +.TP +.B X_HEIGHT +The nominal height of minuscule letters in pixels. +.TP +.B POINT_SIZE +The height of the font in decipoints. +.TP +.B RESOLUTION_X +The horizontal resolution, in dots per inch, the +font was designed for. +.TP +.B RESOLUTION_Y +The vertical resolution, in dots per inch, the +font was designed for. +.TP +.BR CHARSET_REGISTRY " and " CHARSET_ENCODING +Identifies the character encoding used by the +font, ISO10646-1 (the combination \(dqISO10646\(dq, +\(dq1\(dq) is particularly important. + +.SH SEE ALSO +.BR libparsepcf (7), +.BR libparsepcf_preparse_font (3) |