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+/*
+ * Copyright © 2007,2008,2009 Red Hat, 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): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_H_IN
+#error "Include <hb-ot.h> instead."
+#endif
+
+#ifndef HB_OT_LAYOUT_H
+#define HB_OT_LAYOUT_H
+
+#include "hb.h"
+
+#include "hb-ot-name.h"
+
+HB_BEGIN_DECLS
+
+
+#define HB_OT_TAG_BASE HB_TAG('B','A','S','E')
+#define HB_OT_TAG_GDEF HB_TAG('G','D','E','F')
+#define HB_OT_TAG_GSUB HB_TAG('G','S','U','B')
+#define HB_OT_TAG_GPOS HB_TAG('G','P','O','S')
+#define HB_OT_TAG_JSTF HB_TAG('J','S','T','F')
+
+
+/*
+ * Script & Language tags.
+ */
+
+#define HB_OT_TAG_DEFAULT_SCRIPT HB_TAG ('D', 'F', 'L', 'T')
+#define HB_OT_TAG_DEFAULT_LANGUAGE HB_TAG ('d', 'f', 'l', 't')
+
+/**
+ * HB_OT_MAX_TAGS_PER_SCRIPT:
+ *
+ * Since: 2.0.0
+ **/
+#define HB_OT_MAX_TAGS_PER_SCRIPT 3u
+/**
+ * HB_OT_MAX_TAGS_PER_LANGUAGE:
+ *
+ * Since: 2.0.0
+ **/
+#define HB_OT_MAX_TAGS_PER_LANGUAGE 3u
+
+HB_EXTERN void
+hb_ot_tags_from_script_and_language (hb_script_t script,
+ hb_language_t language,
+ unsigned int *script_count /* IN/OUT */,
+ hb_tag_t *script_tags /* OUT */,
+ unsigned int *language_count /* IN/OUT */,
+ hb_tag_t *language_tags /* OUT */);
+
+HB_EXTERN hb_script_t
+hb_ot_tag_to_script (hb_tag_t tag);
+
+HB_EXTERN hb_language_t
+hb_ot_tag_to_language (hb_tag_t tag);
+
+HB_EXTERN void
+hb_ot_tags_to_script_and_language (hb_tag_t script_tag,
+ hb_tag_t language_tag,
+ hb_script_t *script /* OUT */,
+ hb_language_t *language /* OUT */);
+
+
+/*
+ * GDEF
+ */
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_has_glyph_classes (hb_face_t *face);
+
+/**
+ * hb_ot_layout_glyph_class_t:
+ * @HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED: Glyphs not matching the other classifications
+ * @HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH: Spacing, single characters, capable of accepting marks
+ * @HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE: Glyphs that represent ligation of multiple characters
+ * @HB_OT_LAYOUT_GLYPH_CLASS_MARK: Non-spacing, combining glyphs that represent marks
+ * @HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT: Spacing glyphs that represent part of a single character
+ *
+ * The GDEF classes defined for glyphs.
+ *
+ **/
+typedef enum {
+ HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED = 0,
+ HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH = 1,
+ HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE = 2,
+ HB_OT_LAYOUT_GLYPH_CLASS_MARK = 3,
+ HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT = 4
+} hb_ot_layout_glyph_class_t;
+
+HB_EXTERN hb_ot_layout_glyph_class_t
+hb_ot_layout_get_glyph_class (hb_face_t *face,
+ hb_codepoint_t glyph);
+
+HB_EXTERN void
+hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
+ hb_ot_layout_glyph_class_t klass,
+ hb_set_t *glyphs /* OUT */);
+
+/* Not that useful. Provides list of attach points for a glyph that a
+ * client may want to cache */
+HB_EXTERN unsigned int
+hb_ot_layout_get_attach_points (hb_face_t *face,
+ hb_codepoint_t glyph,
+ unsigned int start_offset,
+ unsigned int *point_count /* IN/OUT */,
+ unsigned int *point_array /* OUT */);
+
+/* Ligature caret positions */
+HB_EXTERN unsigned int
+hb_ot_layout_get_ligature_carets (hb_font_t *font,
+ hb_direction_t direction,
+ hb_codepoint_t glyph,
+ unsigned int start_offset,
+ unsigned int *caret_count /* IN/OUT */,
+ hb_position_t *caret_array /* OUT */);
+
+
+/*
+ * GSUB/GPOS feature query and enumeration interface
+ */
+
+#define HB_OT_LAYOUT_NO_SCRIPT_INDEX 0xFFFFu
+#define HB_OT_LAYOUT_NO_FEATURE_INDEX 0xFFFFu
+#define HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX 0xFFFFu
+#define HB_OT_LAYOUT_NO_VARIATIONS_INDEX 0xFFFFFFFFu
+
+HB_EXTERN unsigned int
+hb_ot_layout_table_get_script_tags (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int start_offset,
+ unsigned int *script_count /* IN/OUT */,
+ hb_tag_t *script_tags /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_table_find_script (hb_face_t *face,
+ hb_tag_t table_tag,
+ hb_tag_t script_tag,
+ unsigned int *script_index /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_table_select_script (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_count,
+ const hb_tag_t *script_tags,
+ unsigned int *script_index /* OUT */,
+ hb_tag_t *chosen_script /* OUT */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_table_get_feature_tags (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int start_offset,
+ unsigned int *feature_count /* IN/OUT */,
+ hb_tag_t *feature_tags /* OUT */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_script_get_language_tags (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int start_offset,
+ unsigned int *language_count /* IN/OUT */,
+ hb_tag_t *language_tags /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_script_select_language (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int language_count,
+ const hb_tag_t *language_tags,
+ unsigned int *language_index /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int language_index,
+ unsigned int *feature_index /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_language_get_required_feature (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int language_index,
+ unsigned int *feature_index /* OUT */,
+ hb_tag_t *feature_tag /* OUT */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int language_index,
+ unsigned int start_offset,
+ unsigned int *feature_count /* IN/OUT */,
+ unsigned int *feature_indexes /* OUT */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_language_get_feature_tags (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int language_index,
+ unsigned int start_offset,
+ unsigned int *feature_count /* IN/OUT */,
+ hb_tag_t *feature_tags /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_language_find_feature (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int language_index,
+ hb_tag_t feature_tag,
+ unsigned int *feature_index /* OUT */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_feature_get_lookups (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int feature_index,
+ unsigned int start_offset,
+ unsigned int *lookup_count /* IN/OUT */,
+ unsigned int *lookup_indexes /* OUT */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_table_get_lookup_count (hb_face_t *face,
+ hb_tag_t table_tag);
+
+HB_EXTERN void
+hb_ot_layout_collect_features (hb_face_t *face,
+ hb_tag_t table_tag,
+ const hb_tag_t *scripts,
+ const hb_tag_t *languages,
+ const hb_tag_t *features,
+ hb_set_t *feature_indexes /* OUT */);
+
+HB_EXTERN void
+hb_ot_layout_collect_lookups (hb_face_t *face,
+ hb_tag_t table_tag,
+ const hb_tag_t *scripts,
+ const hb_tag_t *languages,
+ const hb_tag_t *features,
+ hb_set_t *lookup_indexes /* OUT */);
+
+HB_EXTERN void
+hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int lookup_index,
+ hb_set_t *glyphs_before, /* OUT. May be NULL */
+ hb_set_t *glyphs_input, /* OUT. May be NULL */
+ hb_set_t *glyphs_after, /* OUT. May be NULL */
+ hb_set_t *glyphs_output /* OUT. May be NULL */);
+
+#ifdef HB_NOT_IMPLEMENTED
+typedef struct
+{
+ const hb_codepoint_t *before,
+ unsigned int before_length,
+ const hb_codepoint_t *input,
+ unsigned int input_length,
+ const hb_codepoint_t *after,
+ unsigned int after_length,
+} hb_ot_layout_glyph_sequence_t;
+
+typedef hb_bool_t
+(*hb_ot_layout_glyph_sequence_func_t) (hb_font_t *font,
+ hb_tag_t table_tag,
+ unsigned int lookup_index,
+ const hb_ot_layout_glyph_sequence_t *sequence,
+ void *user_data);
+
+HB_EXTERN void
+Xhb_ot_layout_lookup_enumerate_sequences (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int lookup_index,
+ hb_ot_layout_glyph_sequence_func_t callback,
+ void *user_data);
+#endif
+
+/* Variations support */
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_table_find_feature_variations (hb_face_t *face,
+ hb_tag_t table_tag,
+ const int *coords,
+ unsigned int num_coords,
+ unsigned int *variations_index /* out */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_feature_with_variations_get_lookups (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int feature_index,
+ unsigned int variations_index,
+ unsigned int start_offset,
+ unsigned int *lookup_count /* IN/OUT */,
+ unsigned int *lookup_indexes /* OUT */);
+
+
+/*
+ * GSUB
+ */
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_has_substitution (hb_face_t *face);
+
+HB_EXTERN unsigned
+hb_ot_layout_lookup_get_glyph_alternates (hb_face_t *face,
+ unsigned lookup_index,
+ hb_codepoint_t glyph,
+ unsigned start_offset,
+ unsigned *alternate_count /* IN/OUT */,
+ hb_codepoint_t *alternate_glyphs /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_lookup_would_substitute (hb_face_t *face,
+ unsigned int lookup_index,
+ const hb_codepoint_t *glyphs,
+ unsigned int glyphs_length,
+ hb_bool_t zero_context);
+
+HB_EXTERN void
+hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
+ unsigned int lookup_index,
+ hb_set_t *glyphs
+ /*TODO , hb_bool_t inclusive */);
+
+HB_EXTERN void
+hb_ot_layout_lookups_substitute_closure (hb_face_t *face,
+ const hb_set_t *lookups,
+ hb_set_t *glyphs);
+
+
+#ifdef HB_NOT_IMPLEMENTED
+/* Note: You better have GDEF when using this API, or marks won't do much. */
+HB_EXTERN hb_bool_t
+Xhb_ot_layout_lookup_substitute (hb_font_t *font,
+ unsigned int lookup_index,
+ const hb_ot_layout_glyph_sequence_t *sequence,
+ unsigned int out_size,
+ hb_codepoint_t *glyphs_out, /* OUT */
+ unsigned int *clusters_out, /* OUT */
+ unsigned int *out_length /* OUT */);
+#endif
+
+
+/*
+ * GPOS
+ */
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_has_positioning (hb_face_t *face);
+
+#ifdef HB_NOT_IMPLEMENTED
+/* Note: You better have GDEF when using this API, or marks won't do much. */
+HB_EXTERN hb_bool_t
+Xhb_ot_layout_lookup_position (hb_font_t *font,
+ unsigned int lookup_index,
+ const hb_ot_layout_glyph_sequence_t *sequence,
+ hb_glyph_position_t *positions /* IN / OUT */);
+#endif
+
+/* Optical 'size' feature info. Returns true if found.
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#size */
+HB_EXTERN hb_bool_t
+hb_ot_layout_get_size_params (hb_face_t *face,
+ unsigned int *design_size, /* OUT. May be NULL */
+ unsigned int *subfamily_id, /* OUT. May be NULL */
+ hb_ot_name_id_t *subfamily_name_id, /* OUT. May be NULL */
+ unsigned int *range_start, /* OUT. May be NULL */
+ unsigned int *range_end /* OUT. May be NULL */);
+
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_feature_get_name_ids (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int feature_index,
+ hb_ot_name_id_t *label_id /* OUT. May be NULL */,
+ hb_ot_name_id_t *tooltip_id /* OUT. May be NULL */,
+ hb_ot_name_id_t *sample_id /* OUT. May be NULL */,
+ unsigned int *num_named_parameters /* OUT. May be NULL */,
+ hb_ot_name_id_t *first_param_id /* OUT. May be NULL */);
+
+
+HB_EXTERN unsigned int
+hb_ot_layout_feature_get_characters (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int feature_index,
+ unsigned int start_offset,
+ unsigned int *char_count /* IN/OUT. May be NULL */,
+ hb_codepoint_t *characters /* OUT. May be NULL */);
+
+/*
+ * BASE
+ */
+
+/**
+ * hb_ot_layout_baseline_tag_t:
+ * @HB_OT_LAYOUT_BASELINE_TAG_ROMAN: The baseline used by alphabetic scripts such as Latin, Cyrillic and Greek.
+ * In vertical writing mode, the alphabetic baseline for characters rotated 90 degrees clockwise.
+ * (This would not apply to alphabetic characters that remain upright in vertical writing mode, since these
+ * characters are not rotated.)
+ * @HB_OT_LAYOUT_BASELINE_TAG_HANGING: The hanging baseline. In horizontal direction, this is the horizontal
+ * line from which syllables seem, to hang in Tibetan and other similar scripts. In vertical writing mode,
+ * for Tibetan (or some other similar script) characters rotated 90 degrees clockwise.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT: Ideographic character face bottom or left edge,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT: Ideographic character face top or right edge,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT: Ideographic em-box bottom or left edge,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT: Ideographic em-box top or right edge baseline,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_MATH: The baseline about which mathematical characters are centered.
+ * In vertical writing mode when mathematical characters rotated 90 degrees clockwise, are centered.
+ *
+ * Baseline tags from https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags
+ *
+ * Since: 2.6.0
+ */
+typedef enum {
+ HB_OT_LAYOUT_BASELINE_TAG_ROMAN = HB_TAG ('r','o','m','n'),
+ HB_OT_LAYOUT_BASELINE_TAG_HANGING = HB_TAG ('h','a','n','g'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT = HB_TAG ('i','c','f','b'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT = HB_TAG ('i','c','f','t'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT = HB_TAG ('i','d','e','o'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT = HB_TAG ('i','d','t','p'),
+ HB_OT_LAYOUT_BASELINE_TAG_MATH = HB_TAG ('m','a','t','h'),
+
+ _HB_OT_LAYOUT_BASELINE_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
+} hb_ot_layout_baseline_tag_t;
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_get_baseline (hb_font_t *font,
+ hb_ot_layout_baseline_tag_t baseline_tag,
+ hb_direction_t direction,
+ hb_tag_t script_tag,
+ hb_tag_t language_tag,
+ hb_position_t *coord /* OUT. May be NULL. */);
+
+HB_END_DECLS
+
+#endif /* HB_OT_LAYOUT_H */
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