Text Attributes

## Text Attributes Text Attributes — Font and other attributes for annotating text |

## Synopsis

    enum        PangoAttrType;
    #define     PANGO_TYPE_ATTR_TYPE
                PangoAttrClass;
                PangoAttribute;
                PangoAttrString;
                PangoAttrLanguage;
                PangoAttrColor;
                PangoAttrInt;
                PangoAttrFloat;
                PangoAttrFontDesc;
                PangoAttrShape;
                PangoAttrSize;
    gboolean    pango_parse_markup              (const char *markup_text,
                                                 int length,
                                                 gunichar accel_marker,
                                                 PangoAttrList **attr_list,
                                                 char **text,
                                                 gunichar *accel_char,
                                                 GError **error);
    PangoAttrType pango_attr_type_register      (const gchar *name);
    PangoAttribute* pango_attribute_copy        (const PangoAttribute *attr);
    gboolean    pango_attribute_equal           (const PangoAttribute *attr1,
                                                 const PangoAttribute *attr2);
    void        pango_attribute_destroy         (PangoAttribute *attr);

    PangoAttribute* pango_attr_language_new     (PangoLanguage *language);
    PangoAttribute* pango_attr_family_new       (const char *family);
    PangoAttribute* pango_attr_style_new        (PangoStyle style);
    PangoAttribute* pango_attr_variant_new      (PangoVariant variant);
    PangoAttribute* pango_attr_stretch_new      (PangoStretch stretch);
    PangoAttribute* pango_attr_weight_new       (PangoWeight weight);
    PangoAttribute* pango_attr_size_new         (int size);
    PangoAttribute* pango_attr_size_new_absolute
                                                (int size);
    PangoAttribute* pango_attr_font_desc_new    (const PangoFontDescription *desc);
    PangoAttribute* pango_attr_foreground_new   (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);
    PangoAttribute* pango_attr_background_new   (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);
    PangoAttribute* pango_attr_strikethrough_new
                                                (gboolean strikethrough);
    PangoAttribute* pango_attr_strikethrough_color_new
                                                (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);
    PangoAttribute* pango_attr_underline_new    (PangoUnderline underline);
    PangoAttribute* pango_attr_underline_color_new
                                                (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);
    enum        PangoUnderline;
    #define     PANGO_TYPE_UNDERLINE
    PangoAttribute* pango_attr_shape_new        (const PangoRectangle *ink_rect,
                                                 const PangoRectangle *logical_rect);
    PangoAttribute* pango_attr_shape_new_with_data
                                                (const PangoRectangle *ink_rect,
                                                 const PangoRectangle *logical_rect,
                                                 gpointer data,
                                                 PangoAttrDataCopyFunc copy_func,
                                                 GDestroyNotify destroy_func);
    gpointer    (*PangoAttrDataCopyFunc)        (gconstpointer data);
    PangoAttribute* pango_attr_scale_new        (double scale_factor);
    PangoAttribute* pango_attr_fallback_new     (gboolean enable_fallback);
    #define     PANGO_SCALE_XX_SMALL
    #define     PANGO_SCALE_X_SMALL
    #define     PANGO_SCALE_SMALL
    #define     PANGO_SCALE_MEDIUM
    #define     PANGO_SCALE_LARGE
    #define     PANGO_SCALE_X_LARGE
    #define     PANGO_SCALE_XX_LARGE
    PangoAttribute* pango_attr_rise_new         (int rise);
    PangoAttribute* pango_attr_letter_spacing_new
                                                (int letter_spacing);
                PangoColor;
    #define     PANGO_TYPE_COLOR
    void        pango_color_free                (PangoColor *color);
    gboolean    pango_color_parse               (PangoColor *color,
                                                 const char *spec);
    PangoColor* pango_color_copy                (const PangoColor *src);
                PangoLanguage;
    #define     PANGO_TYPE_LANGUAGE
    PangoLanguage* pango_language_from_string   (const char *language);
    #define     pango_language_to_string        (language)
    gboolean    pango_language_matches          (PangoLanguage *language,
                                                 const char *range_list);

                PangoAttrList;
    #define     PANGO_TYPE_ATTR_LIST
    PangoAttrList* pango_attr_list_new          (void);
    PangoAttrList* pango_attr_list_ref          (PangoAttrList *list);
    void        pango_attr_list_unref           (PangoAttrList *list);
    PangoAttrList* pango_attr_list_copy         (PangoAttrList *list);
    void        pango_attr_list_insert          (PangoAttrList *list,
                                                 PangoAttribute *attr);
    void        pango_attr_list_insert_before   (PangoAttrList *list,
                                                 PangoAttribute *attr);
    void        pango_attr_list_change          (PangoAttrList *list,
                                                 PangoAttribute *attr);
    void        pango_attr_list_splice          (PangoAttrList *list,
                                                 PangoAttrList *other,
                                                 gint pos,
                                                 gint len);
    PangoAttrList* pango_attr_list_filter       (PangoAttrList *list,
                                                 PangoAttrFilterFunc func,
                                                 gpointer data);
    gboolean    (*PangoAttrFilterFunc)          (PangoAttribute *attribute,
                                                 gpointer data);
    PangoAttrIterator* pango_attr_list_get_iterator
                                                (PangoAttrList *list);
                PangoAttrIterator;
    PangoAttrIterator* pango_attr_iterator_copy (PangoAttrIterator *iterator);
    gboolean    pango_attr_iterator_next        (PangoAttrIterator *iterator);
    void        pango_attr_iterator_range       (PangoAttrIterator *iterator,
                                                 gint *start,
                                                 gint *end);
    PangoAttribute* pango_attr_iterator_get     (PangoAttrIterator *iterator,
                                                 PangoAttrType type);
    void        pango_attr_iterator_get_font    (PangoAttrIterator *iterator,
                                                 PangoFontDescription *desc,
                                                 PangoLanguage **language,
                                                 GSList **extra_attrs);
    GSList*     pango_attr_iterator_get_attrs   (PangoAttrIterator *iterator);
    void        pango_attr_iterator_destroy     (PangoAttrIterator *iterator);

## Description

Attributed text is used in a number of places in Pango. It is used as the input to the itemization process and also when creating a PangoLayout. The data types and functions in this section are used to represent and manipulate sets of attributes applied to a portion of text.

## Details

### enum PangoAttrType

    typedef enum
    {
      PANGO_ATTR_INVALID,           /* 0 is an invalid attribute type */
      PANGO_ATTR_LANGUAGE,		/* PangoAttrLanguage */
      PANGO_ATTR_FAMILY,		/* PangoAttrString */
      PANGO_ATTR_STYLE,		/* PangoAttrInt */
      PANGO_ATTR_WEIGHT,		/* PangoAttrInt */
      PANGO_ATTR_VARIANT,		/* PangoAttrInt */
      PANGO_ATTR_STRETCH,		/* PangoAttrInt */
      PANGO_ATTR_SIZE,		/* PangoAttrSize */
      PANGO_ATTR_FONT_DESC,		/* PangoAttrFontDesc */
      PANGO_ATTR_FOREGROUND,	/* PangoAttrColor */
      PANGO_ATTR_BACKGROUND,	/* PangoAttrColor */
      PANGO_ATTR_UNDERLINE,		/* PangoAttrInt */
      PANGO_ATTR_STRIKETHROUGH,	/* PangoAttrInt */
      PANGO_ATTR_RISE,		/* PangoAttrInt */
      PANGO_ATTR_SHAPE,		/* PangoAttrShape */
      PANGO_ATTR_SCALE,             /* PangoAttrFloat */
      PANGO_ATTR_FALLBACK,          /* PangoAttrInt */
      PANGO_ATTR_LETTER_SPACING,    /* PangoAttrInt */
      PANGO_ATTR_UNDERLINE_COLOR,	 /* PangoAttrColor */
      PANGO_ATTR_STRIKETHROUGH_COLOR, /* PangoAttrColor */
      PANGO_ATTR_ABSOLUTE_SIZE      /* PangoAttrSize */
    } PangoAttrType;

The PangoAttrType distinguishes between different types of attributes. Along with the predefined values, it is possible to allocate additional values for custom attributes using `pango_attr_type_register()`. The predefined values are given below. The type of structure used to store the attribute is listed in parentheses after the description.

`PANGO_ATTR_INVALID` | does not happen
`PANGO_ATTR_LANGUAGE` | language (PangoAttrLanguage)
`PANGO_ATTR_FAMILY` | font family name list (PangoAttrString)
`PANGO_ATTR_STYLE` | font slant style (PangoAttrInt)
`PANGO_ATTR_WEIGHT` | font weight (PangoAttrInt)
`PANGO_ATTR_VARIANT` | font variant (normal or small caps) (PangoAttrInt)
`PANGO_ATTR_STRETCH` | font stretch (PangoAttrInt)
`PANGO_ATTR_SIZE` | font size in points scaled by `PANGO_SCALE` (PangoAttrInt)
`PANGO_ATTR_FONT_DESC` | font description (PangoAttrFontDesc)
`PANGO_ATTR_FOREGROUND` | foreground color (PangoAttrColor)
`PANGO_ATTR_BACKGROUND` | background color (PangoAttrColor)
`PANGO_ATTR_UNDERLINE` | whether the text has an underline (PangoAttrInt)
`PANGO_ATTR_STRIKETHROUGH` | whether the text is struck-through (PangoAttrInt)
`PANGO_ATTR_RISE` | baseline displacement (PangoAttrInt)
`PANGO_ATTR_SHAPE` | shape (PangoAttrShape)
`PANGO_ATTR_SCALE` | font size scale factor (PangoAttrFloat)
`PANGO_ATTR_FALLBACK` | whether fallback is enabled (PangoAttrInt)
`PANGO_ATTR_LETTER_SPACING` | letter spacing (PangoAttrInt)
`PANGO_ATTR_UNDERLINE_COLOR` | underline color (PangoAttrColor)
`PANGO_ATTR_STRIKETHROUGH_COLOR` | strikethrough color (PangoAttrColor)
`PANGO_ATTR_ABSOLUTE_SIZE` | font size in pixels scaled by `PANGO_SCALE` (PangoAttrInt)

### PANGO_TYPE_ATTR_TYPE

    #define PANGO_TYPE_ATTR_TYPE (pango_attr_type_get_type())

The GObject type for PangoAttrType.

### PangoAttrClass

    typedef struct {
      PangoAttrType type;
      PangoAttribute * (*copy) (const PangoAttribute *attr);
      void             (*destroy) (PangoAttribute *attr);
      gboolean         (*equal) (const PangoAttribute *attr1, const PangoAttribute *attr2);
    } PangoAttrClass;

The PangoAttrClass structure stores the type and operations for a particular type of attribute. The functions in this structure should not be called directly. Instead, one should use the wrapper functions provided for PangoAttribute.

PangoAttrType `type`; | the type ID for this attribute
`copy` () | function to duplicate an attribute of this type (see `pango_attribute_copy()`)
`destroy` () | function to free an attribute of this type (see `pango_attribute_destroy()`)
`equal` () | function to check two attributes of this type for equality (see `pango_attribute_equal()`)

### PangoAttribute

    typedef struct {
      const PangoAttrClass *klass;
      guint start_index;	/* in bytes */
      guint end_index;	/* in bytes. The character at this index is not included */
    } PangoAttribute;

The PangoAttribute structure represents the common portions of all attributes. Particular types of attributes include this structure as their initial portion. The common portion of the attribute holds the range to which the value in the type-specific part of the attribute applies.

const PangoAttrClass *`klass`; | the class structure holding information about the type of the attribute
guint `start_index`; | the start index of the range (in bytes).
guint `end_index`; | end index of the range (in bytes). The character at this index is not included in the range.

### PangoAttrString

    typedef struct {
      PangoAttribute attr;
      char *value;
    } PangoAttrString;

The PangoAttrString structure is used to represent attributes with a string value.

PangoAttribute `attr`; | the common portion of the attribute
char *`value`; | the string which is the value of the attribute

### PangoAttrLanguage

    typedef struct {
      PangoAttribute attr;
      PangoLanguage *value;
    } PangoAttrLanguage;

The PangoAttrLanguage structure is used to represent attributes that are languages.

PangoAttribute `attr`; | the common portion of the attribute
PangoLanguage *`value`; | the PangoLanguage which is the value of the attribute

### PangoAttrColor

    typedef struct {
      PangoAttribute attr;
      PangoColor color;
    } PangoAttrColor;

The PangoAttrColor structure is used to represent attributes that are colors.

PangoAttribute `attr`; | the common portion of the attribute
PangoColor `color`; | the PangoColor which is the value of the attribute

### PangoAttrInt

    typedef struct {
      PangoAttribute attr;
      int value;
    } PangoAttrInt;

The PangoAttrInt structure is used to represent attributes with an integer or enumeration value.

PangoAttribute `attr`; | the common portion of the attribute
int `value`; | the value of the attribute

### PangoAttrFloat

    typedef struct {
      PangoAttribute attr;
      double value;
    } PangoAttrFloat;

The PangoAttrFloat structure is used to represent attributes with a float or double value.

PangoAttribute `attr`; | the common portion of the attribute
double `value`; | the value of the attribute

### PangoAttrFontDesc

    typedef struct {
      PangoAttribute attr;
      PangoFontDescription *desc;
    } PangoAttrFontDesc;

The PangoAttrFontDesc structure is used to store an attribute that sets all aspects of the font description at once.

PangoAttribute `attr`; | the common portion of the attribute
PangoFontDescription *`desc`; | the font description which is the value of this attribute

### PangoAttrShape

    typedef struct {
      PangoAttribute attr;
      PangoRectangle ink_rect;
      PangoRectangle logical_rect;

      gpointer              data;
      PangoAttrDataCopyFunc copy_func;
      GDestroyNotify        destroy_func;
    } PangoAttrShape;

The PangoAttrShape structure is used to represent attributes which impose shape restrictions.

PangoAttribute `attr`; | the common portion of the attribute
PangoRectangle `ink_rect`; | the ink rectangle to restrict to
PangoRectangle `logical_rect`; | the logical rectangle to restrict to
gpointer `data`; | user data set (see `pango_attr_shape_new_with_data()`)
PangoAttrDataCopyFunc `copy_func`; | copy function for the user data
GDestroyNotify `destroy_func`; | destroy function for the user data

### PangoAttrSize

    typedef struct {
      PangoAttribute attr;
      int size;
      guint absolute : 1;
    } PangoAttrSize;

The PangoAttrShape structure is used to represent attributes which set font size.

PangoAttribute `attr`; | the common portion of the attribute
int `size`; | size of font, in units of 1/`PANGO_SCALE` of a point (for `PANGO_ATTR_SIZE`) or of a device uni (for `PANGO_ATTR_ABSOLUTE_SIZE`)
guint `absolute` : 1; | whether the font size is in device units or points. This field is only present for compatibility with Pango-1.8.0 (`PANGO_ATTR_ABSOLUTE_SIZE` was added in 1.8.1); and always will be `FALSE` for `PANGO_ATTR_SIZE` and `TRUE` for `PANGO_ATTR_ABSOLUTE_SIZE`.

### pango_parse_markup ()

    gboolean    pango_parse_markup              (const char *markup_text,
                                                 int length,
                                                 gunichar accel_marker,
                                                 PangoAttrList **attr_list,
                                                 char **text,
                                                 gunichar *accel_char,
                                                 GError **error);

Parses marked-up text (see markup format) to create a plaintext string and an attribute list.

If `accel_marker` is nonzero, the given character will mark the character following it as an accelerator. For example, the accel marker might be an ampersand or underscore. All characters marked as an accelerator will receive a `PANGO_UNDERLINE_LOW` attribute, and the first character so marked will be returned in `accel_char`. Two `accel_marker` characters following each other produce a single literal `accel_marker` character.

`markup_text` : | markup to parse (see markup format)
`length` : | length of `markup_text`, or -1 if nul-terminated
`accel_marker` : | character that precedes an accelerator, or 0 for none
`attr_list` : | address of return location for a PangoAttrList, or `NULL`
`text` : | address of return location for text with tags stripped, or `NULL`
`accel_char` : | address of return location for accelerator char, or `NULL`
`error` : | address of return location for errors, or `NULL`
Returns : | `FALSE` if `error` is set, otherwise `TRUE`

### pango_attr_type_register ()

    PangoAttrType pango_attr_type_register      (const gchar *name);

Allocate a new attribute type ID.

`name` : | an identifier for the type (currently unused.)
Returns : | the new type ID.

### pango_attribute_copy ()

    PangoAttribute* pango_attribute_copy        (const PangoAttribute *attr);

Make a copy of an attribute.

`attr` : | a PangoAttribute
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attribute_equal ()

    gboolean    pango_attribute_equal           (const PangoAttribute *attr1,
                                                 const PangoAttribute *attr2);

Compare two attributes for equality. This compares only the actual value of the two attributes and not the ranges that the attributes apply to.

`attr1` : | a PangoAttribute
`attr2` : | another PangoAttribute
Returns : | `TRUE` if the two attributes have the same value.

### pango_attribute_destroy ()

    void        pango_attribute_destroy         (PangoAttribute *attr);

Destroy a PangoAttribute and free all associated memory.

`attr` : | a PangoAttribute.

### pango_attr_language_new ()

    PangoAttribute* pango_attr_language_new     (PangoLanguage *language);

Create a new language tag attribute.

`language` : | language tag
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_family_new ()

    PangoAttribute* pango_attr_family_new       (const char *family);

Create a new font family attribute.

`family` : | the family or comma separated list of families
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_style_new ()

    PangoAttribute* pango_attr_style_new        (PangoStyle style);

Create a new font slant style attribute.

`style` : | the slant style
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_variant_new ()

    PangoAttribute* pango_attr_variant_new      (PangoVariant variant);

Create a new font variant attribute (normal or small caps)

`variant` : | the variant
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_stretch_new ()

    PangoAttribute* pango_attr_stretch_new      (PangoStretch stretch);

Create a new font stretch attribute

`stretch` : | the stretch
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_weight_new ()

    PangoAttribute* pango_attr_weight_new       (PangoWeight weight);

Create a new font weight attribute.

`weight` : | the weight
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_size_new ()

    PangoAttribute* pango_attr_size_new         (int size);

Create a new font-size attribute in fractional points.

`size` : | the font size, in PANGO_SCALEths of a point.
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_size_new_absolute ()

    PangoAttribute* pango_attr_size_new_absolute
                                                (int size);

Create a new font-size attribute in device units.

`size` : | the font size, in PANGO_SCALEths of a device unit.
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

Since 1.8

### pango_attr_font_desc_new ()

    PangoAttribute* pango_attr_font_desc_new    (const PangoFontDescription *desc);

Create a new font description attribute. This attribute allows setting family, style, weight, variant, stretch, and size simultaneously.

`desc` : | the font description
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_foreground_new ()

    PangoAttribute* pango_attr_foreground_new   (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);

Create a new foreground color attribute.

`red` : | the red value (ranging from 0 to 65535)
`green` : | the green value
`blue` : | the blue value
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_background_new ()

    PangoAttribute* pango_attr_background_new   (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);

Create a new background color attribute.

`red` : | the red value (ranging from 0 to 65535)
`green` : | the green value
`blue` : | the blue value
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_strikethrough_new ()

    PangoAttribute* pango_attr_strikethrough_new
                                                (gboolean strikethrough);

Create a new strike-through attribute.

`strikethrough` : | `TRUE` if the text should be struck-through.
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_strikethrough_color_new ()

    PangoAttribute* pango_attr_strikethrough_color_new
                                                (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);

Create a new strikethrough color attribute. This attribute modifies the color of strikethrough lines. If not set, strikethrough lines will use the foreground color.

`red` : | the red value (ranging from 0 to 65535)
`green` : | the green value
`blue` : | the blue value
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

Since 1.8

### pango_attr_underline_new ()

    PangoAttribute* pango_attr_underline_new    (PangoUnderline underline);

Create a new underline-style attribute.

`underline` : | the underline style.
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_underline_color_new ()

    PangoAttribute* pango_attr_underline_color_new
                                                (guint16 red,
                                                 guint16 green,
                                                 guint16 blue);

Create a new underline color attribute. This attribute modifies the color of underlines. If not set, underlines will use the foreground color.

`red` : | the red value (ranging from 0 to 65535)
`green` : | the green value
`blue` : | the blue value
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

Since 1.8

### enum PangoUnderline

    typedef enum {
      PANGO_UNDERLINE_NONE,
      PANGO_UNDERLINE_SINGLE,
      PANGO_UNDERLINE_DOUBLE,
      PANGO_UNDERLINE_LOW,
      PANGO_UNDERLINE_ERROR
    } PangoUnderline;

the PangoUnderline enumeration is used to specify whether text should be underlined, and if so, the type of underlining.

`PANGO_UNDERLINE_NONE` | no underline should be drawn
`PANGO_UNDERLINE_SINGLE` | a single underline should be drawn
`PANGO_UNDERLINE_DOUBLE` | a double underline should be drawn
`PANGO_UNDERLINE_LOW` | a single underline should be drawn at a position beneath the ink extents of the text being underlined. This should be used only for underlining single characters, such as for keyboard accelerators. `PANGO_UNDERLINE_SINGLE` should be used for extended portions of text.
`PANGO_UNDERLINE_ERROR` | a wavy underline should be drawn below. This underline is typically used to indicate an error such as a possilble mispelling; in some cases a contrasting color may automatically be used. This type of underlining is available since Pango 1.4.

### PANGO_TYPE_UNDERLINE

    #define PANGO_TYPE_UNDERLINE (pango_underline_get_type())

The GObject type for PangoUnderline.

### pango_attr_shape_new ()

    PangoAttribute* pango_attr_shape_new        (const PangoRectangle *ink_rect,
                                                 const PangoRectangle *logical_rect);

Create a new shape attribute. A shape is used to impose a particular ink and logical rect on the result of shaping a particular glyph. This might be used, for instance, for embedding a picture or a widget inside a PangoLayout.

`ink_rect` : | ink rectangle to assign to each character
`logical_rect` : | logical rectangle to assign to each character
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_shape_new_with_data ()

    PangoAttribute* pango_attr_shape_new_with_data
                                                (const PangoRectangle *ink_rect,
                                                 const PangoRectangle *logical_rect,
                                                 gpointer data,
                                                 PangoAttrDataCopyFunc copy_func,
                                                 GDestroyNotify destroy_func);

Like `pango_attr_shape_new()`, but a user data pointer is also provided; this pointer can be accessed when later rendering the glyph.

`ink_rect` : | ink rectangle to assign to each character
`logical_rect` : | logical rectangle to assign to each character
`data` : | user data pointer
`copy_func` : | function to copy `data` when the attribute is copied. If `NULL`, `data` is simply copied as a pointer.
`destroy_func` : | function to free `data` when the attribute is freed, or `NULL`
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

Since 1.8

### PangoAttrDataCopyFunc ()

    gpointer    (*PangoAttrDataCopyFunc)        (gconstpointer data);

A copy function passed to attribute new functions that take user data.

`data` : | the user data
Returns : | a new copy of `data`.

### pango_attr_scale_new ()

    PangoAttribute* pango_attr_scale_new        (double scale_factor);

Create a new font size scale attribute. The base font for the affected text will have its size multiplied by `scale_factor`.

`scale_factor` : | factor to scale the font
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_fallback_new ()

    PangoAttribute* pango_attr_fallback_new     (gboolean enable_fallback);

Create a new font fallback attribute.

If fallback is disabled, characters will only be used from the closest matching font on the system. No fallback will be done to other fonts on the system that might contain the characters in the text.

`enable_fallback` : | `TRUE` if we should fall back on other fonts for characters the active font is missing.
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

Since 1.4

### PANGO_SCALE_XX_SMALL

    #define PANGO_SCALE_XX_SMALL ((double)0.5787037037037)

The scale factor for three shrinking steps (1 / (1.2 * 1.2 * 1.2)).

### PANGO_SCALE_X_SMALL

    #define PANGO_SCALE_X_SMALL  ((double)0.6444444444444)

The scale factor for two shrinking steps (1 / (1.2 * 1.2)).

### PANGO_SCALE_SMALL

    #define PANGO_SCALE_SMALL    ((double)0.8333333333333)

The scale factor for one shrinking step (1 / 1.2).

### PANGO_SCALE_MEDIUM

    #define PANGO_SCALE_MEDIUM   ((double)1.0)

The scale factor for normal size (1.0).

### PANGO_SCALE_LARGE

    #define PANGO_SCALE_LARGE    ((double)1.2)

The scale factor for one magnification step (1.2).

### PANGO_SCALE_X_LARGE

    #define PANGO_SCALE_X_LARGE  ((double)1.4399999999999)

The scale factor for two magnification steps (1.2 * 1.2).

### PANGO_SCALE_XX_LARGE

    #define PANGO_SCALE_XX_LARGE ((double)1.728)

The scale factor for three magnification steps (1.2 * 1.2 * 1.2).

### pango_attr_rise_new ()

    PangoAttribute* pango_attr_rise_new         (int rise);

Create a new baseline displacement attribute.

`rise` : | the amount that the text should be displaced vertically, in Pango units. Positive values displace the text upwards.
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

### pango_attr_letter_spacing_new ()

    PangoAttribute* pango_attr_letter_spacing_new
                                                (int letter_spacing);

Create a new letter-spacing attribute.

`letter_spacing` : | amount of extra space to add between graphemes of the text, in Pango units.
Returns : | the newly allocated PangoAttribute, which should be freed with `pango_attribute_destroy()`.

Since 1.6

### PangoColor

    typedef struct {
      guint16 red;
      guint16 green;
      guint16 blue;
    } PangoColor;

The PangoColor structure is used to represent a color in an uncalibrated RGB colorspace.

guint16 `red`; | The red component of the color. This is a value between 0 and 65535, with 65535 indicating full intensity.
guint16 `green`; | The green component of the color. This is a value between 0 and 65535, with 65535 indicating full intensity.
guint16 `blue`; | The blue component of the color. This is a value between 0 and 65535, with 65535 indicating full intensity.

### PANGO_TYPE_COLOR

    #define PANGO_TYPE_COLOR pango_color_get_type ()

The GObject type for PangoColor.

### pango_color_free ()

    void        pango_color_free                (PangoColor *color);

Frees a color allocated by `pango_color_copy()`.

`color` : | an allocated PangoColor

### pango_color_parse ()

    gboolean    pango_color_parse               (PangoColor *color,
                                                 const char *spec);

Fill in the fields of a color from a string specification. The string can either one of a large set of standard names. (Taken from the X11 `rgb.txt` file), or it can be a hex value in the form '#rgb' '#rrggbb' '#rrrgggbbb' or '#rrrrggggbbbb' where 'r', 'g' and 'b' are hex digits of the red, green, and blue components of the color, respectively. (White in the four forms is '#fff' '#ffffff' '#fffffffff' and '#ffffffffffff')

`color` : | a PangoColor structure in which to store the result
`spec` : | a string specifying the new color
Returns : | `TRUE` if parsing of the specifier succeeded, otherwise false.

### pango_color_copy ()

    PangoColor* pango_color_copy                (const PangoColor *src);

Creates a copy of `src`, which should be freed with `pango_color_free()`. Primarily used by language bindings, not that useful otherwise (since colors can just be copied by assignment in C).

`src` : | color to copy
Returns : | the newly allocated PangoColor, which should be freed with `pango_color_free()`.

### PangoLanguage

    typedef struct _PangoLanguage PangoLanguage;

The PangoLanguage structure is used to represent a language.

PangoLanguage pointers can be efficiently copied and compared with each other.

### PANGO_TYPE_LANGUAGE

    #define PANGO_TYPE_LANGUAGE (pango_language_get_type ())

The GObject type for PangoLanguage.

### pango_language_from_string ()

    PangoLanguage* pango_language_from_string   (const char *language);

Take a RFC-3066 format language tag as a string and convert it to a PangoLanguage pointer that can be efficiently copied (copy the pointer) and compared with other language tags (compare the pointer.)

This function first canonicalizes the string by converting it to lowercase, mapping '_' to '-', and stripping all characters other than letters and '-'.

`language` : | a string representing a language tag
Returns : | an opaque pointer to a PangoLanguage structure. this will be valid forever after.

### pango_language_to_string()

    #define pango_language_to_string(language) ((const char *)language)

Returns a RFC-3066 format string representing the given language tag.

`language` : | a language tag.
Returns : | a string representing the language tag.

### pango_language_matches ()

    gboolean    pango_language_matches          (PangoLanguage *language,
                                                 const char *range_list);

Checks if a language tag matches one of the elements in a list of language ranges. A language tag is considered to match a range in the list if the range is '*', the range is exactly the tag, or the range is a prefix of the tag, and the character after the tag is '-'.

`language` : | a language tag (see `pango_language_from_string()`), `NULL` is allowed and matches nothing but '*'
`range_list` : | a list of language ranges, separated by ';' characters. each element must either be '*', or a RFC 3066 language range canonicalized as by `pango_language_from_string()`
Returns : | `TRUE` if a match was found.

### PangoAttrList

    typedef struct _PangoAttrList PangoAttrList;

The PangoAttrList structure represents a list of attributes that apply to a section of text. The attributes are, in general, allowed to overlap in an arbitrary fashion, however, if the attributes are manipulated only through `pango_attr_list_change()`, the overlap between properties will meet stricter criteria.

Since the PangoAttrList structure is stored as a linear list, it is not suitable for storing attributes for large amounts of text. In general, you should not use a single PangoAttrList for more than one paragraph of text.

### PANGO_TYPE_ATTR_LIST

    #define PANGO_TYPE_ATTR_LIST pango_attr_list_get_type ()

The GObject type for PangoAttrList.

### pango_attr_list_new ()

    PangoAttrList* pango_attr_list_new          (void);

Create a new empty attribute list with a reference count of one.

Returns : | the newly allocated PangoAttrList, which should be freed with `pango_attr_list_unref()`.

### pango_attr_list_ref ()

    PangoAttrList* pango_attr_list_ref          (PangoAttrList *list);

Increase the reference count of the given attribute list by one.

`list` : | a PangoAttrList
Returns : | The attribute list passed in

Since 1.10

### pango_attr_list_unref ()

    void        pango_attr_list_unref           (PangoAttrList *list);

Decrease the reference count of the given attribute list by one. If the result is zero, free the attribute list and the attributes it contains.

`list` : | a PangoAttrList

### pango_attr_list_copy ()

    PangoAttrList* pango_attr_list_copy         (PangoAttrList *list);

Copy `list` and return an identical new list.

`list` : | a PangoAttrList
Returns : | the newly allocated PangoAttrList, with a reference count of one, which should be freed with `pango_attr_list_unref()`.

### pango_attr_list_insert ()

    void        pango_attr_list_insert          (PangoAttrList *list,
                                                 PangoAttribute *attr);

Insert the given attribute into the PangoAttrList. It will be inserted after all other attributes with a matching `start_index`.

`list` : | a PangoAttrList
`attr` : | the attribute to insert. Ownership of this value is assumed by the list.

### pango_attr_list_insert_before ()

    void        pango_attr_list_insert_before   (PangoAttrList *list,
                                                 PangoAttribute *attr);

Insert the given attribute into the PangoAttrList. It will be inserted before all other attributes with a matching `start_index`.

`list` : | a PangoAttrList
`attr` : | the attribute to insert. Ownership of this value is assumed by the list.

### pango_attr_list_change ()

    void        pango_attr_list_change          (PangoAttrList *list,
                                                 PangoAttribute *attr);

Insert the given attribute into the PangoAttrList. It will replace any attributes of the same type on that segment and be merged with any adjoining attributes that are identical.

This function is slower than `pango_attr_list_insert()` for creating a attribute list in order (potentially much slower for large lists). However, `pango_attr_list_insert()` is not suitable for continually changing a set of attributes since it never removes or combines existing attributes.

`list` : | a PangoAttrList
`attr` : | the attribute to insert. Ownership of this value is assumed by the list.

### pango_attr_list_splice ()

    void        pango_attr_list_splice          (PangoAttrList *list,
                                                 PangoAttrList *other,
                                                 gint pos,
                                                 gint len);

This function splices attribute list `other` into `list`. This operation is equivalent to stretching every attribute that applies at position `pos` in `list` by an amount `len`, and then calling `pango_attr_list_change()` with a copy of each attribute in `other` in sequence (offset in position by `pos`).

This operation proves useful for, for instance, inserting a preedit string in the middle of an edit buffer.

`list` : | a PangoAttrList
`other` : | another PangoAttrList
`pos` : | the position in `list` at which to insert `other`
`len` : | the length of the spliced segment. (Note that this must be specified since the attributes in `other` may only be present at some subsection of this range)

### pango_attr_list_filter ()

    PangoAttrList* pango_attr_list_filter       (PangoAttrList *list,
                                                 PangoAttrFilterFunc func,
                                                 gpointer data);

Given a PangoAttrList and callback function, removes any elements of `list` for which `func` returns `TRUE` and inserts them into a new list.

`list` : | a PangoAttrList
`func` : | callback function; returns `TRUE` if an atttribute should be filtered out.
`data` : | Data to be passed to `func`
Returns : | the new PangoAttrList or `NULL` if no attributes of the given types were found.

Since 1.2

### PangoAttrFilterFunc ()

    gboolean    (*PangoAttrFilterFunc)          (PangoAttribute *attribute,
                                                 gpointer data);

A predicate function used by `pango_attr_list_filter()` to filter out a subset of attributes for a list.

`attribute` : | a PangoAttribute
`data` : | callback data passed to `pango_attr_list_filter()`
Returns : | `TRUE` if the attribute should be filtered out

### pango_attr_list_get_iterator ()

    PangoAttrIterator* pango_attr_list_get_iterator
                                                (PangoAttrList *list);

Create a iterator initialized to the beginning of the list. `list` must not be modified until this iterator is freed.

`list` : | a PangoAttrList
Returns : | the newly allocated PangoAttrIterator, which should be freed with `pango_attr_iterator_destroy()`.

### PangoAttrIterator

    typedef struct _PangoAttrIterator PangoAttrIterator;

The PangoAttrIterator structure is used to represent an iterator through a PangoAttrList. A new iterator is created with `pango_attr_list_get_iterator()`. Once the iterator is created, it can be advanced through the style changes in the text using `pango_attr_iterator_next()`. At each style change, the range of the current style segment and the attributes currently in effect can be queried.

### pango_attr_iterator_copy ()

    PangoAttrIterator* pango_attr_iterator_copy (PangoAttrIterator *iterator);

Copy a PangoAttrIterator

`iterator` : | a PangoAttrIterator.
Returns : | the newly allocated PangoAttrIterator, which should be freed with `pango_attr_iterator_destroy()`.

### pango_attr_iterator_next ()

    gboolean    pango_attr_iterator_next        (PangoAttrIterator *iterator);

Advance the iterator until the next change of style.

`iterator` : | a PangoAttrIterator
Returns : | `FALSE` if the iterator is at the end of the list, otherwise `TRUE`

### pango_attr_iterator_range ()

    void        pango_attr_iterator_range       (PangoAttrIterator *iterator,
                                                 gint *start,
                                                 gint *end);

Get the range of the current segment. Note that the stored return values are signed, not unsigned like the values in PangoAttribute. To deal with this API oversight, stored return values that wouldn't fit into a signed integer are clamped to `G_MAXINT`.

`iterator` : | a PangoAttrIterator
`start` : | location to store the start of the range
`end` : | location to store the end of the range

### pango_attr_iterator_get ()

    PangoAttribute* pango_attr_iterator_get     (PangoAttrIterator *iterator,
                                                 PangoAttrType type);

Find the current attribute of a particular type at the iterator location. When multiple attributes of the same type overlap, the attribute whose range starts closest to the current location is used.

`iterator` : | a PangoAttrIterator
`type` : | the type of attribute to find.
Returns : | the current attribute of the given type, or `NULL` if no attribute of that type applies to the current location.

### pango_attr_iterator_get_font ()

    void        pango_attr_iterator_get_font    (PangoAttrIterator *iterator,
                                                 PangoFontDescription *desc,
                                                 PangoLanguage **language,
                                                 GSList **extra_attrs);

Get the font and other attributes at the current iterator position.

`iterator` : | a PangoAttrIterator
`desc` : | a PangoFontDescription to fill in with the current values. The family name in this structure will be set using `pango_font_description_set_family_static()` using values from an attribute in the PangoAttrList associated with the iterator, so if you plan to keep it around, you must call: `pango_font_description_set_family (desc, pango_font_description_get_family (desc))`.
`language` : | if non-`NULL`, location to store language tag for item, or `NULL` if none is found.
`extra_attrs` : | if non-`NULL`, location in which to store a list of non-font attributes at the the current position; only the highest priority value of each attribute will be added to this list. In order to free this value, you must call `pango_attribute_destroy()` on each member.

### pango_attr_iterator_get_attrs ()

    GSList*     pango_attr_iterator_get_attrs   (PangoAttrIterator *iterator);

Gets a list of all attributes at the current position of the iterator.

`iterator` : | a PangoAttrIterator
Returns : | a list of all attributes for the current range. To free this value, call `pango_attribute_destroy()` on each value and `g_slist_free()` on the list.

Since 1.2

### pango_attr_iterator_destroy ()

    void        pango_attr_iterator_destroy     (PangoAttrIterator *iterator);

Destroy a PangoAttrIterator and free all associated memory.

`iterator` : | a PangoAttrIterator.