Pango Reference Manual |
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Fonts — Structures representing abstract fonts
struct PangoFontDescription; #define PANGO_TYPE_FONT_DESCRIPTION enum PangoStyle; #define PANGO_TYPE_STYLE enum PangoWeight; #define PANGO_TYPE_WEIGHT enum PangoVariant; #define PANGO_TYPE_VARIANT enum PangoStretch; #define PANGO_TYPE_STRETCH enum PangoFontMask; #define PANGO_TYPE_FONT_MASK PangoFontDescription* pango_font_description_new (void); PangoFontDescription* pango_font_description_copy (const PangoFontDescription *desc); PangoFontDescription* pango_font_description_copy_static (const PangoFontDescription *desc); guint pango_font_description_hash (const PangoFontDescription *desc); gboolean pango_font_description_equal (const PangoFontDescription *desc1, const PangoFontDescription *desc2); void pango_font_description_free (PangoFontDescription *desc); void pango_font_descriptions_free (PangoFontDescription **descs, int n_descs); void pango_font_description_set_family (PangoFontDescription *desc, const char *family); void pango_font_description_set_family_static (PangoFontDescription *desc, const char *family); G_CONST_RETURN char* pango_font_description_get_family (const PangoFontDescription *desc); void pango_font_description_set_style (PangoFontDescription *desc, PangoStyle style); PangoStyle pango_font_description_get_style (const PangoFontDescription *desc); void pango_font_description_set_variant (PangoFontDescription *desc, PangoVariant variant); PangoVariant pango_font_description_get_variant (const PangoFontDescription *desc); void pango_font_description_set_weight (PangoFontDescription *desc, PangoWeight weight); PangoWeight pango_font_description_get_weight (const PangoFontDescription *desc); void pango_font_description_set_stretch (PangoFontDescription *desc, PangoStretch stretch); PangoStretch pango_font_description_get_stretch (const PangoFontDescription *desc); void pango_font_description_set_size (PangoFontDescription *desc, gint size); gint pango_font_description_get_size (const PangoFontDescription *desc); PangoFontMask pango_font_description_get_set_fields (const PangoFontDescription *desc); void pango_font_description_unset_fields (PangoFontDescription *desc, PangoFontMask to_unset); void pango_font_description_merge (PangoFontDescription *desc, const PangoFontDescription *desc_to_merge, gboolean replace_existing); void pango_font_description_merge_static (PangoFontDescription *desc, const PangoFontDescription *desc_to_merge, gboolean replace_existing); gboolean pango_font_description_better_match (const PangoFontDescription *desc, const PangoFontDescription *old_match, const PangoFontDescription *new_match); PangoFontDescription* pango_font_description_from_string (const char *str); char* pango_font_description_to_string (const PangoFontDescription *desc); char* pango_font_description_to_filename (const PangoFontDescription *desc); struct PangoFontMetrics; #define PANGO_TYPE_FONT_METRICS PangoFontMetrics* pango_font_metrics_ref (PangoFontMetrics *metrics); void pango_font_metrics_unref (PangoFontMetrics *metrics); int pango_font_metrics_get_ascent (PangoFontMetrics *metrics); int pango_font_metrics_get_descent (PangoFontMetrics *metrics); int pango_font_metrics_get_approximate_char_width (PangoFontMetrics *metrics); int pango_font_metrics_get_approximate_digit_width (PangoFontMetrics *metrics); struct PangoFont; #define PANGO_TYPE_FONT #define PANGO_FONT (object) #define PANGO_IS_FONT (object) PangoEngineShape* pango_font_find_shaper (PangoFont *font, PangoLanguage *language, guint32 ch); PangoFontDescription* pango_font_describe (PangoFont *font); PangoCoverage* pango_font_get_coverage (PangoFont *font, PangoLanguage *language); void pango_font_get_glyph_extents (PangoFont *font, PangoGlyph glyph, PangoRectangle *ink_rect, PangoRectangle *logical_rect); PangoFontMetrics* pango_font_get_metrics (PangoFont *font, PangoLanguage *language); struct PangoFontFamily; #define PANGO_TYPE_FONT_FAMILY #define PANGO_FONT_FAMILY (object) #define PANGO_IS_FONT_FAMILY (object) G_CONST_RETURN char* pango_font_family_get_name (PangoFontFamily *family); gboolean pango_font_family_is_monospace (PangoFontFamily *family); void pango_font_family_list_faces (PangoFontFamily *family, PangoFontFace ***faces, int *n_faces); struct PangoFontFace; #define PANGO_TYPE_FONT_FACE #define PANGO_FONT_FACE (object) #define PANGO_IS_FONT_FACE (object) G_CONST_RETURN char* pango_font_face_get_face_name (PangoFontFace *face); void pango_font_face_list_sizes (PangoFontFace *face, int **sizes, int *n_sizes); PangoFontDescription* pango_font_face_describe (PangoFontFace *face); struct PangoFontMap; #define PANGO_TYPE_FONT_MAP #define PANGO_FONT_MAP (object) #define PANGO_IS_FONT_MAP (object) struct PangoFontMapClass; #define PANGO_FONT_MAP_CLASS (klass) #define PANGO_IS_FONT_MAP_CLASS (klass) #define PANGO_FONT_MAP_GET_CLASS (obj) PangoFont* pango_font_map_load_font (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc); PangoFontset* pango_font_map_load_fontset (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc, PangoLanguage *language); void pango_font_map_list_families (PangoFontMap *fontmap, PangoFontFamily ***families, int *n_families); const char* pango_font_map_get_shape_engine_type (PangoFontMap *fontmap); struct PangoFontset; #define PANGO_TYPE_FONTSET struct PangoFontsetClass; PangoFont* pango_fontset_get_font (PangoFontset *fontset, guint wc); PangoFontMetrics* pango_fontset_get_metrics (PangoFontset *fontset); gboolean (*PangoFontsetForeachFunc) (PangoFontset *fontset, PangoFont *font, gpointer data); void pango_fontset_foreach (PangoFontset *fontset, PangoFontsetForeachFunc func, gpointer data); struct PangoFontsetSimple; #define PANGO_TYPE_FONTSET_SIMPLE PangoFontsetSimple* pango_fontset_simple_new (PangoLanguage *language); void pango_fontset_simple_append (PangoFontsetSimple *fontset, PangoFont *font); int pango_fontset_simple_size (PangoFontsetSimple *fontset);
GObject +----PangoFont +----PangoFcFont
GObject +----PangoFontFamily
GObject +----PangoFontFace
GObject +----PangoFontMap +----PangoFcFontMap
GObject +----PangoFontset +----PangoFontsetSimple
GObject +----PangoFontset +----PangoFontsetSimple
Pango supports a flexible architecture where a particular rendering architecture can supply an implementation of fonts. The PangoFont structure represents an abstract rendering-system-indepent font. Pango provides routines to list available fonts, and to load a font of a given description.
struct PangoFontDescription;
The PangoFontDescription structure represents the description of an ideal font. These structures are used both to list what fonts are available on the system and also for specifying the characteristics of a font to load.
#define PANGO_TYPE_FONT_DESCRIPTION (pango_font_description_get_type ())
The GObject type for PangoFontDescription.
typedef enum { PANGO_STYLE_NORMAL, PANGO_STYLE_OBLIQUE, PANGO_STYLE_ITALIC } PangoStyle;
An enumeration specifying the various slant styles possible for a font.
PANGO_STYLE_NORMAL | the font is upright. |
PANGO_STYLE_OBLIQUE | the font is slanted, but in a roman style. |
PANGO_STYLE_ITALIC | the font is slanted in an italic style. |
typedef enum { PANGO_WEIGHT_ULTRALIGHT = 200, PANGO_WEIGHT_LIGHT = 300, PANGO_WEIGHT_NORMAL = 400, PANGO_WEIGHT_BOLD = 700, PANGO_WEIGHT_ULTRABOLD = 800, PANGO_WEIGHT_HEAVY = 900 } PangoWeight;
An enumeration specifying the weight (boldness) of a font. This is a numerical value ranging from 100 to 900, but there are some predefined values:
PANGO_WEIGHT_ULTRALIGHT | the ultralight weight (= 200) |
PANGO_WEIGHT_LIGHT | the light weight (=300) |
PANGO_WEIGHT_NORMAL | the default weight (= 400) |
PANGO_WEIGHT_BOLD | the bold weight (= 700) |
PANGO_WEIGHT_ULTRABOLD | the ultrabold weight (= 800) |
PANGO_WEIGHT_HEAVY | the heavy weight (= 900) |
#define PANGO_TYPE_WEIGHT (pango_weight_get_type())
The GObject type for PangoWeight.
typedef enum { PANGO_VARIANT_NORMAL, PANGO_VARIANT_SMALL_CAPS } PangoVariant;
An enumeration specifying capitalization variant of the font.
PANGO_VARIANT_NORMAL | A normal font. |
PANGO_VARIANT_SMALL_CAPS | A font with the lower case characters replaced by smaller variants of the capital characters. |
#define PANGO_TYPE_VARIANT (pango_variant_get_type())
The GObject type for PangoVariant.
typedef enum { PANGO_STRETCH_ULTRA_CONDENSED, PANGO_STRETCH_EXTRA_CONDENSED, PANGO_STRETCH_CONDENSED, PANGO_STRETCH_SEMI_CONDENSED, PANGO_STRETCH_NORMAL, PANGO_STRETCH_SEMI_EXPANDED, PANGO_STRETCH_EXPANDED, PANGO_STRETCH_EXTRA_EXPANDED, PANGO_STRETCH_ULTRA_EXPANDED } PangoStretch;
An enumeration specifying the width of the font relative to other designs within a family.
PANGO_STRETCH_ULTRA_CONDENSED | |
PANGO_STRETCH_EXTRA_CONDENSED | |
PANGO_STRETCH_CONDENSED | |
PANGO_STRETCH_SEMI_CONDENSED | |
PANGO_STRETCH_NORMAL | the normal width |
PANGO_STRETCH_SEMI_EXPANDED | |
PANGO_STRETCH_EXPANDED | |
PANGO_STRETCH_EXTRA_EXPANDED | |
PANGO_STRETCH_ULTRA_EXPANDED |
#define PANGO_TYPE_STRETCH (pango_stretch_get_type())
The GObject type for PangoStretch.
typedef enum { PANGO_FONT_MASK_FAMILY = 1 << 0, PANGO_FONT_MASK_STYLE = 1 << 1, PANGO_FONT_MASK_VARIANT = 1 << 2, PANGO_FONT_MASK_WEIGHT = 1 << 3, PANGO_FONT_MASK_STRETCH = 1 << 4, PANGO_FONT_MASK_SIZE = 1 << 5 } PangoFontMask;
The bits in a PangoFontMask correspond to fields in a PangoFontDescription that have been set.
PANGO_FONT_MASK_FAMILY | the font family is specified. |
PANGO_FONT_MASK_STYLE | the font style is specified. |
PANGO_FONT_MASK_VARIANT | the font variant is specified. |
PANGO_FONT_MASK_WEIGHT | the font weight is specified. |
PANGO_FONT_MASK_STRETCH | the font stretch is specified. |
PANGO_FONT_MASK_SIZE | the font size is specified. |
#define PANGO_TYPE_FONT_MASK (pango_font_mask_get_type())
The GObject type for PangoFontMask.
PangoFontDescription* pango_font_description_new (void);
Creates a new font description structure with all fields unset.
Returns : | the newly-created PangoFontDescription. Use pango_font_description_free() to free the result. |
PangoFontDescription* pango_font_description_copy (const PangoFontDescription *desc);
Make a copy of a PangoFontDescription.
desc : | a PangoFontDescription |
Returns : | a newly-allocated PangoFontDescription. This value must be freed using pango_font_description_free(). |
PangoFontDescription* pango_font_description_copy_static (const PangoFontDescription *desc);
Like pango_font_description_copy(), but only a shallow copy is made of the family name and other allocated fields. The result can only be used until desc is modififed or freed. This is meant to be used when the copy is only needed temporarily.
desc : | a PangoFontDescription |
Returns : | a newly-allocated PangoFontDescription. This value must be freed using pango_font_description_free(). |
guint pango_font_description_hash (const PangoFontDescription *desc);
Computes a hash of a PangoFontDescription structure suitable to be used, for example, as an argument to g_hash_table_new().
desc : | a PangoFontDescription |
Returns : | the hash value. |
gboolean pango_font_description_equal (const PangoFontDescription *desc1, const PangoFontDescription *desc2);
Compares two font descriptions for equality.
desc1 : | a PangoFontDescription |
desc2 : | another PangoFontDescription |
Returns : | TRUE if the two font descriptions are proveably identical. (Two font descriptions may result in identical fonts being loaded, but still compare FALSE.) |
void pango_font_description_free (PangoFontDescription *desc);
Frees a font description.
desc : | a PangoFontDescription |
void pango_font_descriptions_free (PangoFontDescription **descs, int n_descs);
Frees a list of font descriptions from pango_font_map_list_fonts()
descs : | a pointer to an array of PangoFontDescription |
n_descs : | number of font descriptions in descs |
void pango_font_description_set_family (PangoFontDescription *desc, const char *family);
Sets the family name field of a font description. The family name represents a family of related font styles, and will resolve to a particular PangoFontFamily. In some uses of PangoFontDescription, it is also possible to use a comma separated list of family names for this field.
desc : | a PangoFontDescription. |
family : | a string representing the family name. |
void pango_font_description_set_family_static (PangoFontDescription *desc, const char *family);
Like pango_font_description_set_family(), except that no copy of family is made. The caller must make sure that the string passed in stays around until desc has been freed or the name is set again. This function can be used if family is a static string such as a C string literal, or if desc is only needed temporarily.
desc : | a PangoFontDescription |
family : | a string representing the family name. |
G_CONST_RETURN char* pango_font_description_get_family (const PangoFontDescription *desc);
Gets the family name field of a font description. See pango_font_description_set_family().
desc : | a PangoFontDescription. |
Returns : | The family name field. (Will be NULL if not previously set.) |
void pango_font_description_set_style (PangoFontDescription *desc, PangoStyle style);
Sets the style field of a PangoFontDescription. The PangoStyle enumeration describes whether the font is slanted and the manner in which it is slanted; it can be either PANGO_STYLE_NORMAL, PANGO_STYLE_ITALIC, or PANGO_STYLE_OBLIQUE. Most fonts will either have a italic style or an oblique style, but not both, and font matching in Pango will match italic specifications with oblique fonts and vice-versa if an exact match is not found.
desc : | a PangoFontDescription |
style : | the style for the font description |
PangoStyle pango_font_description_get_style (const PangoFontDescription *desc);
Gets the style field of a PangoFontDescription. See pango_font_description_set_style().
desc : | a PangoFontDescription |
Returns : | the style field for the font description. Use pango_font_description_get_set_fields() to find out if the field was explicitely set or not. |
void pango_font_description_set_variant (PangoFontDescription *desc, PangoVariant variant);
Sets the variant field of a font description. The PangoVariant can either be PANGO_VARIANT_NORMAL or PANGO_VARIANT_SMALL_CAPS.
desc : | a PangoFontDescription |
variant : | the variant type for the font description. |
PangoVariant pango_font_description_get_variant (const PangoFontDescription *desc);
Gets the variant field of a PangoFontDescription. See pango_font_description_set_variant().
desc : | a PangoFontDescription. |
Returns : | the variant field for the font description. Use pango_font_description_get_set_fields() to find out if the field was explicitely set or not. |
void pango_font_description_set_weight (PangoFontDescription *desc, PangoWeight weight);
Sets the weight field of a font description. The weight field specifies how bold or light the font should be. In addition to the values of the PangoWeight enumeration, other intermediate numeric values are possible.
desc : | a PangoFontDescription |
weight : | the weight for the font description. |
PangoWeight pango_font_description_get_weight (const PangoFontDescription *desc);
Gets the weight field of a font description. See pango_font_description_set_weight().
desc : | a PangoFontDescription |
Returns : | the weight field for the font description. Use pango_font_description_get_set_fields() to find out if the field was explicitely set or not. |
void pango_font_description_set_stretch (PangoFontDescription *desc, PangoStretch stretch);
Sets the stretch field of a font description. The stretch field specifies how narrow or wide the font should be.
desc : | a PangoFontDescription |
stretch : | the stretch for the font description |
PangoStretch pango_font_description_get_stretch (const PangoFontDescription *desc);
Gets the stretch field of a font description. See pango_font_description_set_stretch().
desc : | a PangoFontDescription. |
Returns : | the stretch field for the font description. Use pango_font_description_get_set_fields() to find out if the field was explicitely set or not. |
void pango_font_description_set_size (PangoFontDescription *desc, gint size);
Sets the size field of a font description.
desc : | a PangoFontDescription |
size : | the size for the font description in pango units. There are PANGO_SCALE Pango units in one device unit (device unit is a point, for font sizes). |
gint pango_font_description_get_size (const PangoFontDescription *desc);
Gets the size field of a font description. See pango_font_description_get_size().
desc : | a PangoFontDescription |
Returns : | the size field for the font description in pango units. (There are PANGO_SCALE pango units in one device unit — for fonts, font points are the device unit.) Returns 0 if the stretch field has not previously been set. pango_font_description_get_set_fields() to find out if the field was explicitely set or not. |
PangoFontMask pango_font_description_get_set_fields (const PangoFontDescription *desc);
Determines which fields in a font description have been set.
desc : | a PangoFontDescription |
Returns : | a bitmask with bits set corresponding to the fields in desc that have been set. |
void pango_font_description_unset_fields (PangoFontDescription *desc, PangoFontMask to_unset);
Unsets some of the fields in a PangoFontDescription. Note that this merely marks the fields cleared, it does not clear the settings for those fields, to clear a family name set with pango_font_description_set_family_static() so that it won't be returned by subsequent calls to pango_font_description_get_family(), you must actually call pango_font_description_set_family (desc, NULL);
desc : | a PangoFontDescription |
to_unset : | bitmask of fields in the desc to unset. |
void pango_font_description_merge (PangoFontDescription *desc, const PangoFontDescription *desc_to_merge, gboolean replace_existing);
Merges the fields that are set in desc_to_merge into the fields in desc. If replace_existing is FALSE, only fields in desc that are not already set are affected. If TRUE, then fields that are already set will be replaced as well.
desc : | a PangoFontDescription |
desc_to_merge : | the PangoFontDescription to merge from |
replace_existing : | if TRUE, replace fields in desc with the corresponding values from desc_to_merge, even if they are already exist. |
void pango_font_description_merge_static (PangoFontDescription *desc, const PangoFontDescription *desc_to_merge, gboolean replace_existing);
Like pango_font_description_merge(), but only a shallow copy is made of the family name and other allocated fields. desc can only be used until desc_to_merge is modified or freed. This is meant to be used when the merged font description is only needed temporarily.
desc : | a PangoFontDescription |
desc_to_merge : | the PangoFontDescription to merge from |
replace_existing : | if TRUE, replace fields in desc with the corresponding values from desc_to_merge, even if they are already exist. |
gboolean pango_font_description_better_match (const PangoFontDescription *desc, const PangoFontDescription *old_match, const PangoFontDescription *new_match);
Determines if the style attributes of new_match are a closer match for desc than old_match, or if old_match is NULL, determines if new_match is a match at all. Approximate matching is done for weight and style; other attributes must match exactly.
desc : | a PangoFontDescription |
old_match : | a PangoFontDescription, or NULL |
new_match : | a PangoFontDescription |
Returns : | TRUE if new_match is a better match |
PangoFontDescription* pango_font_description_from_string (const char *str);
Creates a new font description from a string representation in the form "[FAMILY-LIST] [STYLE-OPTIONS] [SIZE]", where FAMILY-LIST is a comma separated list of families optionally terminated by a comma, STYLE_OPTIONS is a whitespace separated list of words where each WORD describes one of style, variant, weight, or stretch, and SIZE is an decimal number (size in points). Any one of the options may be absent. If FAMILY-LIST is absent, then the family_name field of the resulting font description will be initialized to NULL. If STYLE-OPTIONS is missing, then all style options will be set to the default values. If SIZE is missing, the size in the resulting font description will be set to 0.
str : | string representation of a font description. |
Returns : | a new PangoFontDescription. |
char* pango_font_description_to_string (const PangoFontDescription *desc);
Creates a string representation of a font description. See pango_font_description_from_string() for a description of the format of the string representation. The family list in the string description will only have a terminating comma if the last word of the list is a valid style option.
desc : | a PangoFontDescription |
Returns : | a new string that must be freed with g_free(). |
char* pango_font_description_to_filename (const PangoFontDescription *desc);
Creates a filename representation of a font description. The filename is identical to the result from calling pango_font_description_to_string(), but with underscores instead of characters that are untypical in filenames, and in lower case only.
desc : | a PangoFontDescription |
Returns : | a new string that must be freed with g_free(). |
struct PangoFontMetrics { guint ref_count; int ascent; int descent; int approximate_char_width; int approximate_digit_width; };
A PangoFontMetrics structure holds the overall metric information for a font (possibly restricted to a script).
#define PANGO_TYPE_FONT_METRICS (pango_font_metrics_get_type ())
The GObject type for PangoFontMetrics.
PangoFontMetrics* pango_font_metrics_ref (PangoFontMetrics *metrics);
Increases the reference count of a font metrics structure.
metrics : | a PangoFontMetrics structure |
Returns : | metrics |
void pango_font_metrics_unref (PangoFontMetrics *metrics);
Decreases the reference count of a font metrics structure. If the result is zero, frees the structure and any associated memory.
metrics : | a PangoFontMetrics structure |
int pango_font_metrics_get_ascent (PangoFontMetrics *metrics);
Gets the ascent from a font metrics structure. The ascent is the distance from the baseline to the logical top of a line of text. (The logical top may be above or below the top of the actual drawn ink. It is necessary to lay out the text to figure where the ink will be.)
metrics : | a PangoFontMetrics structure |
Returns : | the ascent, in pango units. (1 point == PANGO_SCALE pango units.) |
int pango_font_metrics_get_descent (PangoFontMetrics *metrics);
Gets the descent from a font metrics structure. The descent is the distance from the baseline to the logical bottom of a line of text. (The logical bottom may be above or below the bottom of the actual drawn ink. It is necessary to lay out the text to figure where the ink will be.)
metrics : | a PangoFontMetrics structure |
Returns : | the descent, in pango units. (1 point == PANGO_SCALE pango units.) |
int pango_font_metrics_get_approximate_char_width (PangoFontMetrics *metrics);
Gets the approximate character width for a font metrics structure. This is merely a representative value useful, for example, for determining the initial size for a window. Actual characters in text will be wider and narrower than this.
metrics : | a PangoFontMetrics structure |
Returns : | the character width, in pango units. (1 point == PANGO_SCALE pango units.) |
int pango_font_metrics_get_approximate_digit_width (PangoFontMetrics *metrics);
Gets the approximate digit width for a font metrics structure. This is merely a representative value useful, for example, for determining the initial size for a window. Actual digits in text can be wider and narrower than this, though this value is generally somewhat more accurate than the result of pango_font_metrics_get_approximate_digit_width().
metrics : | a PangoFontMetrics structure |
Returns : | the digit width, in pango units. (1 point == PANGO_SCALE pango units.) |
struct PangoFont;
The PangoFont structure is used to represent a font in a rendering-system-independent matter. To create an implementation of a PangoFont, the rendering-system specific code should malloc a larger structure that contains a nested PangoFont, fill in the klass member of the nested PangoFont with a pointer to a appropriate PangoFontClass, then call pango_font_init() on the structure.
The PangoFont structure contains one member which the implementation fills in:
#define PANGO_FONT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_FONT, PangoFont))
Casts a GObject to a PangoFont.
object : | a GObject. |
#define PANGO_IS_FONT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_FONT))
Returns TRUE if object is a PangoFont.
object : | a GObject. |
PangoEngineShape* pango_font_find_shaper (PangoFont *font, PangoLanguage *language, guint32 ch);
Finds the best matching shaper for a font for a particular language tag and character point.
font : | a PangoFont |
language : | the language tag |
ch : | the ISO-10646 character code. |
Returns : | the best matching shaper. |
PangoFontDescription* pango_font_describe (PangoFont *font);
Returns a description of the font.
font : | a PangoFont |
Returns : | a newly-allocated PangoFontDescription object. |
PangoCoverage* pango_font_get_coverage (PangoFont *font, PangoLanguage *language);
Computes the coverage map for a given font and language tag.
font : | a PangoFont |
language : | the language tag |
Returns : | a newly-allocated PangoCoverage object. |
void pango_font_get_glyph_extents (PangoFont *font, PangoGlyph glyph, PangoRectangle *ink_rect, PangoRectangle *logical_rect);
Gets the logical and ink extents of a glyph within a font. The coordinate system for each rectangle has its origin at the base line and horizontal origin of the character with increasing coordinates extending to the right and down. The macros PANGO_ASCENT(), PANGO_DESCENT(), PANGO_LBEARING(), and PANGO_RBEARING can be used to convert from the extents rectangle to more traditional font metrics. The units of the rectangles are in 1/PANGO_SCALE of a device unit.
font : | a PangoFont |
glyph : | the glyph index |
ink_rect : | rectangle used to store the extents of the glyph as drawn or NULL to indicate that the result is not needed. |
logical_rect : | rectangle used to store the logical extents of the glyph or NULL to indicate that the result is not needed. |
PangoFontMetrics* pango_font_get_metrics (PangoFont *font, PangoLanguage *language);
Gets overall metric information for a font. Since the metrics may be substantially different for different scripts, a language tag can be provided to indicate that the metrics should be retrieved that correspond to the script(s) used by that language.
font : | a PangoFont |
language : | language tag used to determine which script to get the metrics for, or NULL to indicate to get the metrics for the entire font. |
Returns : | a PangoMetrics object. The caller must call pango_font_metrics_unref() when finished using the object. |
struct PangoFontFamily;
The PangoFontFamily structure is used to represent a family of related font faces. The faces in a family share a common design, but differ in slant, weight, width and other aspects.
#define PANGO_TYPE_FONT_FAMILY (pango_font_family_get_type ())
The GObject type for PangoFontFamily.
#define PANGO_FONT_FAMILY(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_FONT_FAMILY, PangoFontFamily))
Casts a GObject to a PangoFontFamily.
object : | a GObject. |
#define PANGO_IS_FONT_FAMILY(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_FONT_FAMILY))
Returns TRUE if object is a PangoFontFamily.
object : | a GObject. |
G_CONST_RETURN char* pango_font_family_get_name (PangoFontFamily *family);
Gets the name of the family. The name is unique among all fonts for the font backend and can be used in a PangoFontDescription to specify that a face from this family is desired.
family : | a PangoFontFamily |
Returns : | the name of the family. This string is owned by the family object and must not be modified or freed. |
gboolean pango_font_family_is_monospace (PangoFontFamily *family);
A monospace font is a font designed for text display where the the characters form a regular grid. For Western languages this would mean that the advance width of all characters are the same, but this categorization also includes Asian fonts which include double-width characters: characters that occupy two grid cells. g_unichar_iswide() returns a result that indicates whether a character is typically double-width in a monospace font.
The best way to find out the grid-cell size is to call pango_font_metrics_get_approximate_digit_width(), since the results of pango_font_metrics_get_approximate_char_width() may be affected by double-width characters.
family : | a PangoFontFamily |
Returns : | TRUE if the family is monospace. |
void pango_font_family_list_faces (PangoFontFamily *family, PangoFontFace ***faces, int *n_faces);
Lists the different font faces that make up family. The faces in a family share a common design, but differ in slant, weight, width and other aspects.
family : | a PangoFontFamily |
faces : | location to store an array of pointers to PangoFontFace objects, or NULL. This array should be freed with g_free() when it is no longer needed. |
n_faces : | location to store number of elements in faces. |
struct PangoFontFace;
The PangoFontFace structure is used to represent a group of fonts with the same family, slant, weight, width, but varying sizes.
#define PANGO_TYPE_FONT_FACE (pango_font_face_get_type ())
The GObject type for PangoFontFace.
#define PANGO_FONT_FACE(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_FONT_FACE, PangoFontFace))
Casts a GObject to a PangoFontFace.
object : | a GObject. |
#define PANGO_IS_FONT_FACE(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_FONT_FACE))
Returns TRUE if object is a PangoFontFace.
object : | a GObject. |
G_CONST_RETURN char* pango_font_face_get_face_name (PangoFontFace *face);
Gets a name representing the style of this face among the different faces in the PangoFontFamily for the face. This name is unique among all faces in the family and is suitable for displaying to users.
face : | a PangoFontFace. |
Returns : | the face name for the face. This string is owned by the face object and must not be modified or freed. |
void pango_font_face_list_sizes (PangoFontFace *face, int **sizes, int *n_sizes);
List the available sizes for a font. This is only applicable to bitmap fonts. For scalable fonts, stores NULL at the location pointed to by sizes and 0 at the location pointed to by n_sizes. The sizes returned are in pango units and are sorted in ascending order.
face : | a PangoFontFace. |
sizes : | location to store a pointer to an array of int. This array should be freed with g_free(). |
n_sizes : | location to store the number of elements in sizes |
Since 1.4
PangoFontDescription* pango_font_face_describe (PangoFontFace *face);
Returns the family, style, variant, weight and stretch of a PangoFontFace. The size field of the resulting font description will be unset.
face : | a PangoFontFace |
Returns : | a newly-created PangoFontDescription structure holding the description of the face. Use pango_font_description_free() to free the result. |
struct PangoFontMap;
The PangoFontMap represents the set of fonts available for a particular rendering system. This is a virtual object with implementations being specific to particular rendering systems. To create an implementation of a PangoFontMap, the rendering-system specific code should malloc a larger structure that contains a nested PangoFontMap, fill in the klass member of the nested PangoFontMap with a pointer to a appropriate PangoFontMapClass, then call pango_font_map_init() on the structure.
The PangoFont structure contains one member which the implementation fills in:
#define PANGO_TYPE_FONT_MAP (pango_font_map_get_type ())
The GObject type for PangoFontMap.
#define PANGO_FONT_MAP(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_FONT_MAP, PangoFontMap))
Casts a GObject to a PangoFontMap.
object : | a GObject. |
#define PANGO_IS_FONT_MAP(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_FONT_MAP))
Returns TRUE if object is a PangoFontMap.
object : | a GObject. |
struct PangoFontMapClass { GObjectClass parent_class; PangoFont * (*load_font) (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc); void (*list_families) (PangoFontMap *fontmap, PangoFontFamily ***families, int *n_families); PangoFontset *(*load_fontset) (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc, PangoLanguage *language); const char *shape_engine_type; };
The PangoFontMapClass structure holds the virtual functions for a particular PangoFontMap implementation.
GObjectClass parent_class | |
PangoFont* (*load_font) (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc) | a function to load a font with a given description. See pango_font_map_load_font() |
void (*list_families) (PangoFontMap *fontmap, PangoFontFamily ***families, int *n_families) | A function to list available font families. See pango_font_map_list_families(). |
PangoFontset* (*load_fontset) (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc, PangoLanguage *language) | |
const char *shape_engine_type |
#define PANGO_FONT_MAP_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FONT_MAP, PangoFontMapClass))
Casts a GObject to a PangoFontMapClass.
klass : | a GObject. |
#define PANGO_IS_FONT_MAP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_FONT_MAP))
Returns TRUE if klass is a subtype of PangoFontMapClass.
klass : | a GObject. |
#define PANGO_FONT_MAP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_FONT_MAP, PangoFontMapClass))
Returns the type of a PangoFontMap.
obj : | a PangoFontMap. |
PangoFont* pango_font_map_load_font (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc);
Load the font in the fontmap that is the closest match for desc.
fontmap : | a PangoFontMap |
context : | the PangoContext the font will be used with |
desc : | a PangoFontDescription describing the font to load |
Returns : | the font loaded, or NULL if no font matched. |
PangoFontset* pango_font_map_load_fontset (PangoFontMap *fontmap, PangoContext *context, const PangoFontDescription *desc, PangoLanguage *language);
Load a set of fonts in the fontmap that can be used to render a font matching desc.
fontmap : | a PangoFontMap |
context : | the PangoContext the font will be used with |
desc : | a PangoFontDescription describing the font to load |
language : | a PangoLanguage the fonts will be used for |
Returns : | the fontset, or NULL if no font matched. |
void pango_font_map_list_families (PangoFontMap *fontmap, PangoFontFamily ***families, int *n_families);
List all families for a fontmap.
fontmap : | a PangoFontMap |
families : | location to store a pointer to an array of PangoFontFamily *. This array should be freed with g_free(). |
n_families : | location to store the number of elements in descs |
const char* pango_font_map_get_shape_engine_type (PangoFontMap *fontmap);
Returns the render ID for shape engines for this fontmap. See the render_type field of PangoEngineInfo.
fontmap : | a PangoFontmap |
Returns : | the ID string for shape engines for this fontmap. Owned by Pango, should not be modified or freed. |
Since 1.4
struct PangoFontset;
A PangoFontset represents a set of PangoFont to use when rendering text. It is the result of resolving a PangoFontDescription against a particular PangoContext. It has operations for finding the component font for a particular Unicode character, and for finding a composite set of metrics for the entire fontset.
#define PANGO_TYPE_FONTSET (pango_fontset_get_type ())
The GObject type for PangoFontset.
struct PangoFontsetClass { GObjectClass parent_class; PangoFont * (*get_font) (PangoFontset *fontset, guint wc); PangoFontMetrics *(*get_metrics) (PangoFontset *fontset); PangoLanguage * (*get_language) (PangoFontset *fontset); void (*foreach) (PangoFontset *fontset, PangoFontsetForeachFunc func, gpointer data); };
The PangoFontsetClass structure holds the virtual functions for a particular PangoFontset implementation.
GObjectClass parent_class | |
PangoFont* (*get_font) (PangoFontset *fontset, guint wc) | a function to get the font in the fontset that contains the best glyph for the given unicode character; see pango_fontset_get_font(). |
PangoFontMetrics* (*get_metrics) (PangoFontset *fontset) | a function to get overall metric information for the fonts in the fontset; see pango_fontset_get_metrics(). |
PangoLanguage* (*get_language) (PangoFontset *fontset) | a function to get the language of the fontset. |
void (*foreach) (PangoFontset *fontset, PangoFontsetForeachFunc func, gpointer data) |
PangoFont* pango_fontset_get_font (PangoFontset *fontset, guint wc);
Returns the font in the fontset that contains the best glyph for the unicode character wc.
fontset : | a PangoFontset |
wc : | a unicode character |
Returns : | a PangoFont. The caller must call g_object_unref when finished with the font. |
PangoFontMetrics* pango_fontset_get_metrics (PangoFontset *fontset);
Get overall metric information for the fonts in the fontset.
fontset : | a PangoFontset |
Returns : | a PangoMetrics object. The caller must call pango_font_metrics_unref() when finished using the object. |
gboolean (*PangoFontsetForeachFunc) (PangoFontset *fontset, PangoFont *font, gpointer data);
A callback function used by pango_fontset_foreach() when enumerating the fonts in a fontset.
fontset : | a PangoFontset |
font : | a font from fontset |
data : | callback data |
Returns : | if TRUE, stop iteration and return immediately. |
Since 1.4
void pango_fontset_foreach (PangoFontset *fontset, PangoFontsetForeachFunc func, gpointer data);
Iterates through all the fonts in a fontset, calling func for each one. If func returns TRUE, that stops the iteration.
fontset : | a PangoFontset |
func : | Callback function |
data : | data to pass to the callback function |
Since 1.4
struct PangoFontsetSimple;
PangoFontSetSimple is a implementation of the abstract PangoFontSet base class in terms of an array of fonts, which the creator provides when constructing the PangoFontSetSimple.
#define PANGO_TYPE_FONTSET_SIMPLE (pango_fontset_simple_get_type ())
The GObject type for PangoFontsetSimple.
PangoFontsetSimple* pango_fontset_simple_new (PangoLanguage *language);
Creates a new PangoFontsetSimple for the given language.
language : | a PangoLanguage tag |
Returns : | a newly-allocated PangoFontsetSimple. |
void pango_fontset_simple_append (PangoFontsetSimple *fontset, PangoFont *font);
Adds a font to the fontset.
fontset : | a PangoFontsetSimple. |
font : | a PangoFont. |
int pango_fontset_simple_size (PangoFontsetSimple *fontset);
Returns the number of fonts in the fontset.
fontset : | a PangoFontsetSimple. |
Returns : | the size of fontset. |
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