/* * Copyright © 1998-2004 David Turner and Werner Lemberg * Copyright © 2004,2007,2009 Red Hat, Inc. * Copyright © 2011,2012 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Red Hat Author(s): Owen Taylor, Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #if !defined(HB_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR) #error "Include <hb.h> instead." #endif #ifndef HB_BUFFER_H #define HB_BUFFER_H #include "hb-common.h" #include "hb-unicode.h" #include "hb-font.h" HB_BEGIN_DECLS /** * hb_glyph_info_t: * @codepoint: either a Unicode code point (before shaping) or a glyph index * (after shaping). * @cluster: the index of the character in the original text that corresponds * to this #hb_glyph_info_t, or whatever the client passes to * hb_buffer_add(). More than one #hb_glyph_info_t can have the same * @cluster value, if they resulted from the same character (e.g. one * to many glyph substitution), and when more than one character gets * merged in the same glyph (e.g. many to one glyph substitution) the * #hb_glyph_info_t will have the smallest cluster value of them. * By default some characters are merged into the same cluster * (e.g. combining marks have the same cluster as their bases) * even if they are separate glyphs, hb_buffer_set_cluster_level() * allow selecting more fine-grained cluster handling. * * The #hb_glyph_info_t is the structure that holds information about the * glyphs and their relation to input text. */ hb_glyph_info_t; /** * hb_glyph_flags_t: * @HB_GLYPH_FLAG_UNSAFE_TO_BREAK: Indicates that if input text is broken at the * beginning of the cluster this glyph is part of, * then both sides need to be re-shaped, as the * result might be different. * On the flip side, it means that when this * flag is not present, then it is safe to break * the glyph-run at the beginning of this * cluster, and the two sides will represent the * exact same result one would get if breaking * input text at the beginning of this cluster * and shaping the two sides separately. * This can be used to optimize paragraph * layout, by avoiding re-shaping of each line * after line-breaking. * @HB_GLYPH_FLAG_UNSAFE_TO_CONCAT: Indicates that if input text is changed on one * side of the beginning of the cluster this glyph * is part of, then the shaping results for the * other side might change. * Note that the absence of this flag will NOT by * itself mean that it IS safe to concat text. * Only two pieces of text both of which clear of * this flag can be concatenated safely. * This can be used to optimize paragraph * layout, by avoiding re-shaping of each line * after line-breaking, by limiting the * reshaping to a small piece around the * breaking position only, even if the breaking * position carries the * #HB_GLYPH_FLAG_UNSAFE_TO_BREAK or when * hyphenation or other text transformation * happens at line-break position, in the following * way: * 1. Iterate back from the line-break position * until the first cluster start position that is * NOT unsafe-to-concat, 2. shape the segment from * there till the end of line, 3. check whether the * resulting glyph-run also is clear of the * unsafe-to-concat at its start-of-text position; * if it is, just splice it into place and the line * is shaped; If not, move on to a position further * back that is clear of unsafe-to-concat and retry * from there, and repeat. * At the start of next line a similar algorithm can * be implemented. That is: 1. Iterate forward from * the line-break position until the first cluster * start position that is NOT unsafe-to-concat, 2. * shape the segment from beginning of the line to * that position, 3. check whether the resulting * glyph-run also is clear of the unsafe-to-concat * at its end-of-text position; if it is, just splice * it into place and the beginning is shaped; If not, * move on to a position further forward that is clear * of unsafe-to-concat and retry up to there, and repeat. * A slight complication will arise in the * implementation of the algorithm above, * because while our buffer API has a way to * return flags for position corresponding to * start-of-text, there is currently no position * corresponding to end-of-text. This limitation * can be alleviated by shaping more text than needed * and looking for unsafe-to-concat flag within text * clusters. * The #HB_GLYPH_FLAG_UNSAFE_TO_BREAK flag will * always imply this flag. * To use this flag, you must enable the buffer flag * @HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT during * shaping, otherwise the buffer flag will not be * reliably produced. * Since: 4.0.0 * @HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL: In scripts that use elongation (Arabic, Mongolian, Syriac, etc.), this flag signifies that it is safe to insert a U+0640 TATWEEL character before this cluster for elongation. This flag does not determine the script-specific elongation places, but only when it is safe to do the elongation without interrupting text shaping. Since: 5.1.0 * @HB_GLYPH_FLAG_DEFINED: All the currently defined flags. * * Flags for #hb_glyph_info_t. * * Since: 1.5.0 */ hb_glyph_flags_t; HB_EXTERN hb_glyph_flags_t hb_glyph_info_get_glyph_flags (const hb_glyph_info_t *info); #define hb_glyph_info_get_glyph_flags(info) … /** * hb_glyph_position_t: * @x_advance: how much the line advances after drawing this glyph when setting * text in horizontal direction. * @y_advance: how much the line advances after drawing this glyph when setting * text in vertical direction. * @x_offset: how much the glyph moves on the X-axis before drawing it, this * should not affect how much the line advances. * @y_offset: how much the glyph moves on the Y-axis before drawing it, this * should not affect how much the line advances. * * 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. * */ hb_glyph_position_t; /** * hb_segment_properties_t: * @direction: the #hb_direction_t of the buffer, see hb_buffer_set_direction(). * @script: the #hb_script_t of the buffer, see hb_buffer_set_script(). * @language: the #hb_language_t of the buffer, see hb_buffer_set_language(). * * 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. */ hb_segment_properties_t; /** * HB_SEGMENT_PROPERTIES_DEFAULT: * * The default #hb_segment_properties_t of of freshly created #hb_buffer_t. */ #define HB_SEGMENT_PROPERTIES_DEFAULT … HB_EXTERN hb_bool_t hb_segment_properties_equal (const hb_segment_properties_t *a, const hb_segment_properties_t *b); HB_EXTERN unsigned int hb_segment_properties_hash (const hb_segment_properties_t *p); HB_EXTERN void hb_segment_properties_overlay (hb_segment_properties_t *p, const hb_segment_properties_t *src); /** * hb_buffer_t: * * The main structure holding the input text and its properties before shaping, * and output glyphs and their information after shaping. */ hb_buffer_t; HB_EXTERN hb_buffer_t * hb_buffer_create (void); HB_EXTERN hb_buffer_t * hb_buffer_create_similar (const hb_buffer_t *src); HB_EXTERN void hb_buffer_reset (hb_buffer_t *buffer); HB_EXTERN hb_buffer_t * hb_buffer_get_empty (void); HB_EXTERN hb_buffer_t * hb_buffer_reference (hb_buffer_t *buffer); HB_EXTERN void hb_buffer_destroy (hb_buffer_t *buffer); HB_EXTERN 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); HB_EXTERN void * hb_buffer_get_user_data (const hb_buffer_t *buffer, hb_user_data_key_t *key); /** * hb_buffer_content_type_t: * @HB_BUFFER_CONTENT_TYPE_INVALID: Initial value for new buffer. * @HB_BUFFER_CONTENT_TYPE_UNICODE: The buffer contains input characters (before shaping). * @HB_BUFFER_CONTENT_TYPE_GLYPHS: The buffer contains output glyphs (after shaping). * * The type of #hb_buffer_t contents. */ hb_buffer_content_type_t; HB_EXTERN void hb_buffer_set_content_type (hb_buffer_t *buffer, hb_buffer_content_type_t content_type); HB_EXTERN hb_buffer_content_type_t hb_buffer_get_content_type (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_unicode_funcs (hb_buffer_t *buffer, hb_unicode_funcs_t *unicode_funcs); HB_EXTERN hb_unicode_funcs_t * hb_buffer_get_unicode_funcs (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_direction (hb_buffer_t *buffer, hb_direction_t direction); HB_EXTERN hb_direction_t hb_buffer_get_direction (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_script (hb_buffer_t *buffer, hb_script_t script); HB_EXTERN hb_script_t hb_buffer_get_script (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_language (hb_buffer_t *buffer, hb_language_t language); HB_EXTERN hb_language_t hb_buffer_get_language (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_segment_properties (hb_buffer_t *buffer, const hb_segment_properties_t *props); HB_EXTERN void hb_buffer_get_segment_properties (const hb_buffer_t *buffer, hb_segment_properties_t *props); HB_EXTERN void hb_buffer_guess_segment_properties (hb_buffer_t *buffer); /** * hb_buffer_flags_t: * @HB_BUFFER_FLAG_DEFAULT: the default buffer flag. * @HB_BUFFER_FLAG_BOT: flag indicating that special handling of the beginning * of text paragraph can be applied to this buffer. Should usually * be set, unless you are passing to the buffer only part * of the text without the full context. * @HB_BUFFER_FLAG_EOT: flag indicating that special handling of the end of text * paragraph can be applied to this buffer, similar to * @HB_BUFFER_FLAG_BOT. * @HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES: * flag indication that character with Default_Ignorable * Unicode property should use the corresponding glyph * from the font, instead of hiding them (done by * replacing them with the space glyph and zeroing the * advance width.) This flag takes precedence over * @HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES. * @HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES: * flag indication that character with Default_Ignorable * Unicode property should be removed from glyph string * instead of hiding them (done by replacing them with the * space glyph and zeroing the advance width.) * @HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES takes * precedence over this flag. Since: 1.8.0 * @HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE: * flag indicating that a dotted circle should * not be inserted in the rendering of incorrect * character sequences (such at <0905 093E>). Since: 2.4.0 * @HB_BUFFER_FLAG_VERIFY: * flag indicating that the hb_shape() call and its variants * should perform various verification processes on the results * of the shaping operation on the buffer. If the verification * fails, then either a buffer message is sent, if a message * handler is installed on the buffer, or a message is written * to standard error. In either case, the shaping result might * be modified to show the failed output. Since: 3.4.0 * @HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT: * flag indicating that the @HB_GLYPH_FLAG_UNSAFE_TO_CONCAT * glyph-flag should be produced by the shaper. By default * it will not be produced since it incurs a cost. Since: 4.0.0 * @HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL: * flag indicating that the @HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL * glyph-flag should be produced by the shaper. By default * it will not be produced. Since: 5.1.0 * @HB_BUFFER_FLAG_DEFINED: All currently defined flags: Since: 4.4.0 * * Flags for #hb_buffer_t. * * Since: 0.9.20 */ hb_buffer_flags_t; HB_EXTERN void hb_buffer_set_flags (hb_buffer_t *buffer, hb_buffer_flags_t flags); HB_EXTERN hb_buffer_flags_t hb_buffer_get_flags (const hb_buffer_t *buffer); /** * hb_buffer_cluster_level_t: * @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES: Return cluster values grouped by graphemes into * monotone order. * @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS: Return cluster values grouped into monotone order. * @HB_BUFFER_CLUSTER_LEVEL_CHARACTERS: Don't group cluster values. * @HB_BUFFER_CLUSTER_LEVEL_DEFAULT: Default cluster level, * equal to @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES. * * Data type for holding HarfBuzz's clustering behavior options. The cluster level * dictates one aspect of how HarfBuzz will treat non-base characters * during shaping. * * In @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES, non-base * characters are merged into the cluster of the base character that precedes them. * * In @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS, non-base characters are initially * assigned their own cluster values, which are not merged into preceding base * clusters. This allows HarfBuzz to perform additional operations like reorder * sequences of adjacent marks. * * @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES is the default, because it maintains * backward compatibility with older versions of HarfBuzz. New client programs that * do not need to maintain such backward compatibility are recommended to use * @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS instead of the default. * * Since: 0.9.42 */ hb_buffer_cluster_level_t; HB_EXTERN void hb_buffer_set_cluster_level (hb_buffer_t *buffer, hb_buffer_cluster_level_t cluster_level); HB_EXTERN hb_buffer_cluster_level_t hb_buffer_get_cluster_level (const hb_buffer_t *buffer); /** * HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT: * * The default code point for replacing invalid characters in a given encoding. * Set to U+FFFD REPLACEMENT CHARACTER. * * Since: 0.9.31 */ #define HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT … HB_EXTERN void hb_buffer_set_replacement_codepoint (hb_buffer_t *buffer, hb_codepoint_t replacement); HB_EXTERN hb_codepoint_t hb_buffer_get_replacement_codepoint (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_invisible_glyph (hb_buffer_t *buffer, hb_codepoint_t invisible); HB_EXTERN hb_codepoint_t hb_buffer_get_invisible_glyph (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_not_found_glyph (hb_buffer_t *buffer, hb_codepoint_t not_found); HB_EXTERN hb_codepoint_t hb_buffer_get_not_found_glyph (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_not_found_variation_selector_glyph (hb_buffer_t *buffer, hb_codepoint_t not_found_variation_selector); HB_EXTERN hb_codepoint_t hb_buffer_get_not_found_variation_selector_glyph (const hb_buffer_t *buffer); HB_EXTERN void hb_buffer_set_random_state (hb_buffer_t *buffer, unsigned state); HB_EXTERN unsigned hb_buffer_get_random_state (const hb_buffer_t *buffer); /* * Content API. */ HB_EXTERN void hb_buffer_clear_contents (hb_buffer_t *buffer); HB_EXTERN hb_bool_t hb_buffer_pre_allocate (hb_buffer_t *buffer, unsigned int size); HB_EXTERN hb_bool_t hb_buffer_allocation_successful (hb_buffer_t *buffer); HB_EXTERN void hb_buffer_reverse (hb_buffer_t *buffer); HB_EXTERN void hb_buffer_reverse_range (hb_buffer_t *buffer, unsigned int start, unsigned int end); HB_EXTERN void hb_buffer_reverse_clusters (hb_buffer_t *buffer); /* Filling the buffer in */ HB_EXTERN void hb_buffer_add (hb_buffer_t *buffer, hb_codepoint_t codepoint, unsigned int cluster); HB_EXTERN void hb_buffer_add_utf8 (hb_buffer_t *buffer, const char *text, int text_length, unsigned int item_offset, int item_length); HB_EXTERN void hb_buffer_add_utf16 (hb_buffer_t *buffer, const uint16_t *text, int text_length, unsigned int item_offset, int item_length); HB_EXTERN void hb_buffer_add_utf32 (hb_buffer_t *buffer, const uint32_t *text, int text_length, unsigned int item_offset, int item_length); HB_EXTERN void hb_buffer_add_latin1 (hb_buffer_t *buffer, const uint8_t *text, int text_length, unsigned int item_offset, int item_length); HB_EXTERN void hb_buffer_add_codepoints (hb_buffer_t *buffer, const hb_codepoint_t *text, int text_length, unsigned int item_offset, int item_length); HB_EXTERN void hb_buffer_append (hb_buffer_t *buffer, const hb_buffer_t *source, unsigned int start, unsigned int end); HB_EXTERN hb_bool_t hb_buffer_set_length (hb_buffer_t *buffer, unsigned int length); HB_EXTERN unsigned int hb_buffer_get_length (const hb_buffer_t *buffer); /* Getting glyphs out of the buffer */ HB_EXTERN hb_glyph_info_t * hb_buffer_get_glyph_infos (hb_buffer_t *buffer, unsigned int *length); HB_EXTERN hb_glyph_position_t * hb_buffer_get_glyph_positions (hb_buffer_t *buffer, unsigned int *length); HB_EXTERN hb_bool_t hb_buffer_has_positions (hb_buffer_t *buffer); HB_EXTERN void hb_buffer_normalize_glyphs (hb_buffer_t *buffer); /* * Serialize */ /** * hb_buffer_serialize_flags_t: * @HB_BUFFER_SERIALIZE_FLAG_DEFAULT: serialize glyph names, clusters and positions. * @HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS: do not serialize glyph cluster. * @HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS: do not serialize glyph position information. * @HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES: do no serialize glyph name. * @HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS: serialize glyph extents. * @HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS: serialize glyph flags. Since: 1.5.0 * @HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES: do not serialize glyph advances, * glyph offsets will reflect absolute glyph positions. Since: 1.8.0 * @HB_BUFFER_SERIALIZE_FLAG_DEFINED: All currently defined flags. Since: 4.4.0 * * Flags that control what glyph information are serialized in hb_buffer_serialize_glyphs(). * * Since: 0.9.20 */ hb_buffer_serialize_flags_t; /** * hb_buffer_serialize_format_t: * @HB_BUFFER_SERIALIZE_FORMAT_TEXT: a human-readable, plain text format. * @HB_BUFFER_SERIALIZE_FORMAT_JSON: a machine-readable JSON format. * @HB_BUFFER_SERIALIZE_FORMAT_INVALID: invalid format. * * The buffer serialization and de-serialization format used in * hb_buffer_serialize_glyphs() and hb_buffer_deserialize_glyphs(). * * Since: 0.9.2 */ hb_buffer_serialize_format_t; HB_EXTERN hb_buffer_serialize_format_t hb_buffer_serialize_format_from_string (const char *str, int len); HB_EXTERN const char * hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format); HB_EXTERN const char ** hb_buffer_serialize_list_formats (void); HB_EXTERN 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); HB_EXTERN unsigned int hb_buffer_serialize_unicode (hb_buffer_t *buffer, unsigned int start, unsigned int end, char *buf, unsigned int buf_size, unsigned int *buf_consumed, hb_buffer_serialize_format_t format, hb_buffer_serialize_flags_t flags); HB_EXTERN unsigned int hb_buffer_serialize (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); HB_EXTERN 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); HB_EXTERN hb_bool_t hb_buffer_deserialize_unicode (hb_buffer_t *buffer, const char *buf, int buf_len, const char **end_ptr, hb_buffer_serialize_format_t format); /* * Compare buffers */ /** * hb_buffer_diff_flags_t: * @HB_BUFFER_DIFF_FLAG_EQUAL: equal buffers. * @HB_BUFFER_DIFF_FLAG_CONTENT_TYPE_MISMATCH: buffers with different * #hb_buffer_content_type_t. * @HB_BUFFER_DIFF_FLAG_LENGTH_MISMATCH: buffers with differing length. * @HB_BUFFER_DIFF_FLAG_NOTDEF_PRESENT: `.notdef` glyph is present in the * reference buffer. * @HB_BUFFER_DIFF_FLAG_DOTTED_CIRCLE_PRESENT: dotted circle glyph is present * in the reference buffer. * @HB_BUFFER_DIFF_FLAG_CODEPOINT_MISMATCH: difference in #hb_glyph_info_t.codepoint * @HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH: difference in #hb_glyph_info_t.cluster * @HB_BUFFER_DIFF_FLAG_GLYPH_FLAGS_MISMATCH: difference in #hb_glyph_flags_t. * @HB_BUFFER_DIFF_FLAG_POSITION_MISMATCH: difference in #hb_glyph_position_t. * * Flags from comparing two #hb_buffer_t's. * * Buffer with different #hb_buffer_content_type_t cannot be meaningfully * compared in any further detail. * * For buffers with differing length, the per-glyph comparison is not * attempted, though we do still scan reference buffer for dotted circle and * `.notdef` glyphs. * * If the buffers have the same length, we compare them glyph-by-glyph and * report which aspect(s) of the glyph info/position are different. * * Since: 1.5.0 */ hb_buffer_diff_flags_t; /* Compare the contents of two buffers, report types of differences. */ HB_EXTERN hb_buffer_diff_flags_t hb_buffer_diff (hb_buffer_t *buffer, hb_buffer_t *reference, hb_codepoint_t dottedcircle_glyph, unsigned int position_fuzz); /* * Tracing. */ /** * hb_buffer_message_func_t: * @buffer: An #hb_buffer_t to work upon * @font: The #hb_font_t the @buffer is shaped with * @message: `NULL`-terminated message passed to the function * @user_data: User data pointer passed by the caller * * A callback method for #hb_buffer_t. The method gets called with the * #hb_buffer_t it was set on, the #hb_font_t the buffer is shaped with and a * message describing what step of the shaping process will be performed. * Returning `false` from this method will skip this shaping step and move to * the next one. * * Return value: `true` to perform the shaping step, `false` to skip it. * * Since: 1.1.3 */ hb_buffer_message_func_t; HB_EXTERN void hb_buffer_set_message_func (hb_buffer_t *buffer, hb_buffer_message_func_t func, void *user_data, hb_destroy_func_t destroy); HB_END_DECLS #endif /* HB_BUFFER_H */
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