hb_buffer_create ()

hb_buffer_t *
hb_buffer_create (void);

Creates a new hb_buffer_t with all properties to defaults.

[Xconstructor]

Since: 0.9.2

hb_buffer_reference ()

hb_buffer_t *
hb_buffer_reference (hb_buffer_t *buffer);

Increases the reference count on buffer by one. This prevents buffer from being destroyed until a matching call to hb_buffer_destroy() is made.

[skip]

Since: 0.9.2

hb_buffer_get_empty ()

hb_buffer_t *
hb_buffer_get_empty (void);

Since: 0.9.2

hb_buffer_destroy ()

void
hb_buffer_destroy (hb_buffer_t *buffer);

Deallocate the buffer . Decreases the reference count on buffer by one. If the result is zero, then buffer and all associated resources are freed. See hb_buffer_reference().

[skip]

Since: 0.9.2

hb_buffer_reset ()

void
hb_buffer_reset (hb_buffer_t *buffer);

Resets the buffer to its initial status, as if it was just newly created with hb_buffer_create().

Since: 0.9.2

hb_buffer_clear_contents ()

void
hb_buffer_clear_contents (hb_buffer_t *buffer);

Similar to hb_buffer_reset(), but does not clear the Unicode functions and the replacement code point.

Since: 0.9.11

hb_buffer_pre_allocate ()

hb_bool_t
hb_buffer_pre_allocate (hb_buffer_t *buffer,
                        unsigned int size);

Pre allocates memory for buffer to fit at least size number of items.

Since: 0.9.2

hb_buffer_allocation_successful ()

hb_bool_t
hb_buffer_allocation_successful (hb_buffer_t *buffer);

Check if allocating memory for the buffer succeeded.

Since: 0.9.2

hb_buffer_add ()

void
hb_buffer_add (hb_buffer_t *buffer,
               hb_codepoint_t codepoint,
               unsigned int cluster);

Appends a character with the Unicode value of codepoint to buffer , and gives it the initial cluster value of cluster . Clusters can be any thing the client wants, they are usually used to refer to the index of the character in the input text stream and are output in hb_glyph_info_t.cluster field.

This function does not check the validity of codepoint , it is up to the caller to ensure it is a valid Unicode code point.

Since: 0.9.7

hb_buffer_add_codepoints ()

void
hb_buffer_add_codepoints (hb_buffer_t *buffer,
                          const hb_codepoint_t *text,
                          int text_length,
                          unsigned int item_offset,
                          int item_length);

Appends characters from text array to buffer . The item_offset is the position of the first character from text that will be appended, and item_length is the number of character. When shaping part of a larger text (e.g. a run of text from a paragraph), instead of passing just the substring corresponding to the run, it is preferable to pass the whole paragraph and specify the run start and length as item_offset and item_length , respectively, to give HarfBuzz the full context to be able, for example, to do cross-run Arabic shaping or properly handle combining marks at stat of run.

This function does not check the validity of text , it is up to the caller to ensure it contains a valid Unicode code points.

Since: 0.9.31

hb_buffer_add_utf32 ()

void
hb_buffer_add_utf32 (hb_buffer_t *buffer,
                     const uint32_t *text,
                     int text_length,
                     unsigned int item_offset,
                     int item_length);

See hb_buffer_add_codepoints().

Replaces invalid UTF-32 characters with the buffer replacement code point, see hb_buffer_set_replacement_codepoint().

Since: 0.9.2

hb_buffer_add_utf16 ()

void
hb_buffer_add_utf16 (hb_buffer_t *buffer,
                     const uint16_t *text,
                     int text_length,
                     unsigned int item_offset,
                     int item_length);

See hb_buffer_add_codepoints().

Replaces invalid UTF-16 characters with the buffer replacement code point, see hb_buffer_set_replacement_codepoint().

Since: 0.9.2

hb_buffer_add_utf8 ()

void
hb_buffer_add_utf8 (hb_buffer_t *buffer,
                    const char *text,
                    int text_length,
                    unsigned int item_offset,
                    int item_length);

See hb_buffer_add_codepoints().

Replaces invalid UTF-8 characters with the buffer replacement code point, see hb_buffer_set_replacement_codepoint().

Since: 0.9.2

hb_buffer_add_latin1 ()

void
hb_buffer_add_latin1 (hb_buffer_t *buffer,
                      const uint8_t *text,
                      int text_length,
                      unsigned int item_offset,
                      int item_length);

Similar to hb_buffer_add_codepoints(), but allows only access to first 256 Unicode code points that can fit in 8-bit strings.

Since: 0.9.39

hb_buffer_set_content_type ()

void
hb_buffer_set_content_type (hb_buffer_t *buffer,
                            hb_buffer_content_type_t content_type);

Sets the type of buffer contents, buffers are either empty, contain characters (before shaping) or glyphs (the result of shaping).

Since: 0.9.5

hb_buffer_get_content_type ()

hb_buffer_content_type_t
hb_buffer_get_content_type (hb_buffer_t *buffer);

see hb_buffer_set_content_type().

Since: 0.9.5

hb_buffer_set_direction ()

void
hb_buffer_set_direction (hb_buffer_t *buffer,
                         hb_direction_t direction);

Set the text flow direction of the buffer. No shaping can happen without setting buffer direction, and it controls the visual direction for the output glyphs; for RTL direction the glyphs will be reversed. Many layout features depend on the proper setting of the direction, for example, reversing RTL text before shaping, then shaping with LTR direction is not the same as keeping the text in logical order and shaping with RTL direction.

Since: 0.9.2

hb_buffer_get_direction ()

hb_direction_t
hb_buffer_get_direction (hb_buffer_t *buffer);

See hb_buffer_set_direction()

Since: 0.9.2

hb_buffer_set_script ()

void
hb_buffer_set_script (hb_buffer_t *buffer,
                      hb_script_t script);

Sets the script of buffer to script .

Script is crucial for choosing the proper shaping behaviour for scripts that require it (e.g. Arabic) and the which OpenType features defined in the font to be applied.

You can pass one of the predefined hb_script_t values, or use hb_script_from_string() or hb_script_from_iso15924_tag() to get the corresponding script from an ISO 15924 script tag.

Since: 0.9.2

hb_buffer_get_script ()

hb_script_t
hb_buffer_get_script (hb_buffer_t *buffer);

See hb_buffer_set_script().

Since: 0.9.2

hb_buffer_set_language ()

void
hb_buffer_set_language (hb_buffer_t *buffer,
                        hb_language_t language);

Sets the language of buffer to language .

Languages are crucial for selecting which OpenType feature to apply to the buffer which can result in applying language-specific behaviour. Languages are orthogonal to the scripts, and though they are related, they are different concepts and should not be confused with each other.

Use hb_language_from_string() to convert from ISO 639 language codes to hb_language_t.

Since: 0.9.2

hb_buffer_get_language ()

hb_language_t
hb_buffer_get_language (hb_buffer_t *buffer);

See hb_buffer_set_language().

Since: 0.9.2

hb_buffer_set_flags ()

void
hb_buffer_set_flags (hb_buffer_t *buffer,
                     hb_buffer_flags_t flags);

Sets buffer flags to flags . See hb_buffer_flags_t.

Since: 0.9.7

hb_buffer_get_flags ()

hb_buffer_flags_t
hb_buffer_get_flags (hb_buffer_t *buffer);

See hb_buffer_set_flags().

Since: 0.9.7

hb_buffer_set_cluster_level ()

void
hb_buffer_set_cluster_level (hb_buffer_t *buffer,
                             hb_buffer_cluster_level_t cluster_level);

Since: 0.9.42

hb_buffer_get_cluster_level ()

hb_buffer_cluster_level_t
hb_buffer_get_cluster_level (hb_buffer_t *buffer);

Since: 0.9.42

hb_buffer_set_length ()

hb_bool_t
hb_buffer_set_length (hb_buffer_t *buffer,
                      unsigned int length);

Similar to hb_buffer_pre_allocate(), but clears any new items added at the end.

Since: 0.9.2

hb_buffer_get_length ()

unsigned int
hb_buffer_get_length (hb_buffer_t *buffer);

Returns the number of items in the buffer.

Since: 0.9.2

hb_buffer_set_segment_properties ()

void
hb_buffer_set_segment_properties (hb_buffer_t *buffer,
                                  const hb_segment_properties_t *props);

Sets the segment properties of the buffer, a shortcut for calling hb_buffer_set_direction(), hb_buffer_set_script() and hb_buffer_set_language() individually.

Since: 0.9.7

hb_buffer_get_segment_properties ()

void
hb_buffer_get_segment_properties (hb_buffer_t *buffer,
                                  hb_segment_properties_t *props);

Sets props to the hb_segment_properties_t of buffer .

Since: 0.9.7

hb_buffer_guess_segment_properties ()

void
hb_buffer_guess_segment_properties (hb_buffer_t *buffer);

Sets unset buffer segment properties based on buffer Unicode contents. If buffer is not empty, it must have content type HB_BUFFER_CONTENT_TYPE_UNICODE.

If buffer script is not set (ie. is HB_SCRIPT_INVALID), it will be set to the Unicode script of the first character in the buffer that has a script other than HB_SCRIPT_COMMON, HB_SCRIPT_INHERITED, and HB_SCRIPT_UNKNOWN.

Next, if buffer direction is not set (ie. is HB_DIRECTION_INVALID), it will be set to the natural horizontal direction of the buffer script as returned by hb_script_get_horizontal_direction().

Finally, if buffer language is not set (ie. is HB_LANGUAGE_INVALID), it will be set to the process's default language as returned by hb_language_get_default(). This may change in the future by taking buffer script into consideration when choosing a language.

Since: 0.9.7

hb_buffer_set_unicode_funcs ()

void
hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
                             hb_unicode_funcs_t *unicode_funcs);

Since: 0.9.2

hb_buffer_get_unicode_funcs ()

hb_unicode_funcs_t *
hb_buffer_get_unicode_funcs (hb_buffer_t *buffer);

Since: 0.9.2

hb_buffer_set_user_data ()

hb_bool_t
hb_buffer_set_user_data (hb_buffer_t *buffer,
                         hb_user_data_key_t *key,
                         void *data,
                         hb_destroy_func_t destroy,
                         hb_bool_t replace);

[skip]

Since: 0.9.2

hb_buffer_get_user_data ()

void *
hb_buffer_get_user_data (hb_buffer_t *buffer,
                         hb_user_data_key_t *key);

[skip]

Since: 0.9.2

hb_buffer_get_glyph_infos ()

hb_glyph_info_t *
hb_buffer_get_glyph_infos (hb_buffer_t *buffer,
                           unsigned int *length);

Returns buffer glyph information array. Returned pointer is valid as long as buffer contents are not modified.

Since: 0.9.2

hb_buffer_get_glyph_positions ()

hb_glyph_position_t *
hb_buffer_get_glyph_positions (hb_buffer_t *buffer,
                               unsigned int *length);

Returns buffer glyph position array. Returned pointer is valid as long as buffer contents are not modified.

Since: 0.9.2

hb_buffer_set_replacement_codepoint ()

void
hb_buffer_set_replacement_codepoint (hb_buffer_t *buffer,
                                     hb_codepoint_t replacement);

Sets the hb_codepoint_t that replaces invalid entries for a given encoding when adding text to buffer .

Default is HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT.

Since: 0.9.31

hb_buffer_get_replacement_codepoint ()

hb_codepoint_t
hb_buffer_get_replacement_codepoint (hb_buffer_t *buffer);

See hb_buffer_set_replacement_codepoint().

Since: 0.9.31

hb_buffer_normalize_glyphs ()

void
hb_buffer_normalize_glyphs (hb_buffer_t *buffer);

Reorders a glyph buffer to have canonical in-cluster glyph order / position. The resulting clusters should behave identical to pre-reordering clusters.

Since: 0.9.2

hb_buffer_reverse ()

void
hb_buffer_reverse (hb_buffer_t *buffer);

Reverses buffer contents.

Since: 0.9.2

hb_buffer_reverse_range ()

void
hb_buffer_reverse_range (hb_buffer_t *buffer,
                         unsigned int start,
                         unsigned int end);

Reverses buffer contents between start to end.

Since: 0.9.41

hb_buffer_reverse_clusters ()

void
hb_buffer_reverse_clusters (hb_buffer_t *buffer);

Reverses buffer clusters. That is, the buffer contents are reversed, then each cluster (consecutive items having the same cluster number) are reversed again.

Since: 0.9.2

hb_buffer_serialize_glyphs ()

unsigned int
hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
                            unsigned int start,
                            unsigned int end,
                            char *buf,
                            unsigned int buf_size,
                            unsigned int *buf_consumed,
                            hb_font_t *font,
                            hb_buffer_serialize_format_t format,
                            hb_buffer_serialize_flags_t flags);

Serializes buffer into a textual representation of its glyph content, useful for showing the contents of the buffer, for example during debugging. There are currently two supported serialization formats:

Since: 0.9.7

hb_buffer_deserialize_glyphs ()

hb_bool_t
hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
                              const char *buf,
                              int buf_len,
                              const char **end_ptr,
                              hb_font_t *font,
                              hb_buffer_serialize_format_t format);

Since: 0.9.7

hb_buffer_serialize_format_from_string ()

hb_buffer_serialize_format_t
hb_buffer_serialize_format_from_string
                               (const char *str,
                                int len);

Parses a string into an hb_buffer_serialize_format_t. Does not check if str is a valid buffer serialization format, use hb_buffer_serialize_list_formats() to get the list of supported formats.

Since: 0.9.7

hb_buffer_serialize_format_to_string ()

const char *
hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format);

Converts format to the string corresponding it, or NULL if it is not a valid hb_buffer_serialize_format_t.

Since: 0.9.7

hb_buffer_serialize_list_formats ()

const char **
hb_buffer_serialize_list_formats (void);

Returns a list of supported buffer serialization formats.

Since: 0.9.7

hb_segment_properties_equal ()

hb_bool_t
hb_segment_properties_equal (const hb_segment_properties_t *a,
                             const hb_segment_properties_t *b);

Checks the equality of two hb_segment_properties_t's.

Since: 0.9.7

hb_segment_properties_hash ()

unsigned int
hb_segment_properties_hash (const hb_segment_properties_t *p);

Creates a hash representing p .

Since: 0.9.7

hb_buffer_set_message_func ()

void
hb_buffer_set_message_func (hb_buffer_t *buffer,
                            hb_buffer_message_func_t func,
                            void *user_data,
                            hb_destroy_func_t destroy);

Since: 1.1.3

hb_buffer_message_func_t ()

hb_bool_t
(*hb_buffer_message_func_t) (hb_buffer_t *buffer,
                             hb_font_t *font,
                             const char *message,
                             void *user_data);

HB_SEGMENT_PROPERTIES_DEFAULT

#define             HB_SEGMENT_PROPERTIES_DEFAULT

HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT

#define HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT 0xFFFDu

The default code point for replacing invalid characters in a given encoding. Set to U+FFFD REPLACEMENT CHARACTER.

Since: 0.9.31

hb_buffer_t

typedef struct hb_buffer_t hb_buffer_t;

The main structure holding the input text and its properties before shaping, and output glyphs and their information after shaping.

hb_glyph_info_t

typedef struct {
  hb_codepoint_t codepoint;
  hb_mask_t      mask;
  uint32_t       cluster;
} hb_glyph_info_t;

The hb_glyph_info_t is the structure that holds information about the glyphs and their relation to input text.

hb_glyph_position_t

typedef struct {
  hb_position_t  x_advance;
  hb_position_t  y_advance;
  hb_position_t  x_offset;
  hb_position_t  y_offset;
} hb_glyph_position_t;

The hb_glyph_position_t is the structure that holds the positions of the glyph in both horizontal and vertical directions. All positions in hb_glyph_position_t are relative to the current point.

enum hb_buffer_content_type_t

enum hb_buffer_flags_t

Since: 0.9.20

enum hb_buffer_cluster_level_t

hb_segment_properties_t

typedef struct {
  hb_direction_t  direction;
  hb_script_t     script;
  hb_language_t   language;
} hb_segment_properties_t;

The structure that holds various text properties of an hb_buffer_t. Can be set and retrieved using hb_buffer_set_segment_properties() and hb_buffer_get_segment_properties(), respectively.

enum hb_buffer_serialize_format_t

The buffer serialization and de-serialization format used in hb_buffer_serialize_glyphs() and hb_buffer_deserialize_glyphs().

Since: 0.9.2

enum hb_buffer_serialize_flags_t

Flags that control what glyph information are serialized in hb_buffer_serialize_glyphs().

Since: 0.9.20