/gfx/harfbuzz/src/hb-ot-layout.cc
C++ | 504 lines | 354 code | 90 blank | 60 comment | 49 complexity | 3d089a1505c468007bd34c7cf29dc4a6 MD5 | raw file
Possible License(s): AGPL-1.0, MIT, BSD-3-Clause, Apache-2.0, LGPL-2.1, 0BSD, LGPL-3.0, MPL-2.0-no-copyleft-exception, GPL-2.0, JSON
- /*
- * Copyright (C) 1998-2004 David Turner and Werner Lemberg
- * Copyright (C) 2006 Behdad Esfahbod
- * Copyright (C) 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
- */
- #define HB_OT_LAYOUT_CC
- #include "hb-ot-layout-private.hh"
- #include "hb-ot-layout-gdef-private.hh"
- #include "hb-ot-layout-gsub-private.hh"
- #include "hb-ot-layout-gpos-private.hh"
- #include "hb-ot-shape-private.hh"
- #include <stdlib.h>
- #include <string.h>
- HB_BEGIN_DECLS
- hb_ot_layout_t *
- _hb_ot_layout_new (hb_face_t *face)
- {
- /* Remove this object altogether */
- hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
- layout->gdef_blob = Sanitizer<GDEF>::sanitize (hb_face_get_table (face, HB_OT_TAG_GDEF));
- layout->gdef = Sanitizer<GDEF>::lock_instance (layout->gdef_blob);
- layout->gsub_blob = Sanitizer<GSUB>::sanitize (hb_face_get_table (face, HB_OT_TAG_GSUB));
- layout->gsub = Sanitizer<GSUB>::lock_instance (layout->gsub_blob);
- layout->gpos_blob = Sanitizer<GPOS>::sanitize (hb_face_get_table (face, HB_OT_TAG_GPOS));
- layout->gpos = Sanitizer<GPOS>::lock_instance (layout->gpos_blob);
- return layout;
- }
- void
- _hb_ot_layout_free (hb_ot_layout_t *layout)
- {
- hb_blob_unlock (layout->gdef_blob);
- hb_blob_unlock (layout->gsub_blob);
- hb_blob_unlock (layout->gpos_blob);
- hb_blob_destroy (layout->gdef_blob);
- hb_blob_destroy (layout->gsub_blob);
- hb_blob_destroy (layout->gpos_blob);
- free (layout);
- }
- static inline const GDEF&
- _get_gdef (hb_face_t *face)
- {
- return likely (face->ot_layout && face->ot_layout->gdef) ? *face->ot_layout->gdef : Null(GDEF);
- }
- static inline const GSUB&
- _get_gsub (hb_face_t *face)
- {
- return likely (face->ot_layout && face->ot_layout->gsub) ? *face->ot_layout->gsub : Null(GSUB);
- }
- static inline const GPOS&
- _get_gpos (hb_face_t *face)
- {
- return likely (face->ot_layout && face->ot_layout->gpos) ? *face->ot_layout->gpos : Null(GPOS);
- }
- /*
- * GDEF
- */
- hb_bool_t
- hb_ot_layout_has_glyph_classes (hb_face_t *face)
- {
- return _get_gdef (face).has_glyph_classes ();
- }
- unsigned int
- _hb_ot_layout_get_glyph_property (hb_face_t *face,
- hb_glyph_info_t *info)
- {
- if (!info->props_cache())
- {
- const GDEF &gdef = _get_gdef (face);
- info->props_cache() = gdef.get_glyph_props (info->codepoint);
- }
- return info->props_cache();
- }
- static hb_bool_t
- _hb_ot_layout_match_properties (hb_face_t *face,
- hb_codepoint_t codepoint,
- unsigned int glyph_props,
- unsigned int lookup_props)
- {
- /* Not covered, if, for example, glyph class is ligature and
- * lookup_props includes LookupFlags::IgnoreLigatures
- */
- if (glyph_props & lookup_props & LookupFlag::IgnoreFlags)
- return false;
- if (glyph_props & HB_OT_LAYOUT_GLYPH_CLASS_MARK)
- {
- /* If using mark filtering sets, the high short of
- * lookup_props has the set index.
- */
- if (lookup_props & LookupFlag::UseMarkFilteringSet)
- return _get_gdef (face).mark_set_covers (lookup_props >> 16, codepoint);
- /* The second byte of lookup_props has the meaning
- * "ignore marks of attachment type different than
- * the attachment type specified."
- */
- if (lookup_props & LookupFlag::MarkAttachmentType && glyph_props & LookupFlag::MarkAttachmentType)
- return (lookup_props & LookupFlag::MarkAttachmentType) == (glyph_props & LookupFlag::MarkAttachmentType);
- }
- return true;
- }
- hb_bool_t
- _hb_ot_layout_check_glyph_property (hb_face_t *face,
- hb_glyph_info_t *ginfo,
- unsigned int lookup_props,
- unsigned int *property_out)
- {
- unsigned int property;
- property = _hb_ot_layout_get_glyph_property (face, ginfo);
- (void) (property_out && (*property_out = property));
- return _hb_ot_layout_match_properties (face, ginfo->codepoint, property, lookup_props);
- }
- hb_bool_t
- _hb_ot_layout_skip_mark (hb_face_t *face,
- hb_glyph_info_t *ginfo,
- unsigned int lookup_props,
- unsigned int *property_out)
- {
- unsigned int property;
- property = _hb_ot_layout_get_glyph_property (face, ginfo);
- (void) (property_out && (*property_out = property));
- /* If it's a mark, skip it we don't accept it. */
- if (unlikely (property & HB_OT_LAYOUT_GLYPH_CLASS_MARK))
- return !_hb_ot_layout_match_properties (face, ginfo->codepoint, property, lookup_props);
- /* If not a mark, don't skip. */
- return false;
- }
- 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 */)
- {
- return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
- }
- unsigned int
- hb_ot_layout_get_ligature_carets (hb_font_t *font,
- hb_face_t *face,
- hb_direction_t direction,
- hb_codepoint_t glyph,
- unsigned int start_offset,
- unsigned int *caret_count /* IN/OUT */,
- int *caret_array /* OUT */)
- {
- hb_ot_layout_context_t c;
- c.font = font;
- c.face = face;
- return _get_gdef (face).get_lig_carets (&c, direction, glyph, start_offset, caret_count, caret_array);
- }
- /*
- * GSUB/GPOS
- */
- static const GSUBGPOS&
- get_gsubgpos_table (hb_face_t *face,
- hb_tag_t table_tag)
- {
- switch (table_tag) {
- case HB_OT_TAG_GSUB: return _get_gsub (face);
- case HB_OT_TAG_GPOS: return _get_gpos (face);
- default: return Null(GSUBGPOS);
- }
- }
- 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 */)
- {
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- return g.get_script_tags (start_offset, script_count, script_tags);
- }
- 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)
- {
- ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- if (g.find_script_index (script_tag, script_index))
- return TRUE;
- /* try finding 'DFLT' */
- if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
- return FALSE;
- /* try with 'dflt'; MS site has had typos and many fonts use it now :(.
- * including many versions of DejaVu Sans Mono! */
- if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
- return FALSE;
- if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
- return FALSE;
- }
- hb_bool_t
- hb_ot_layout_table_choose_script (hb_face_t *face,
- hb_tag_t table_tag,
- const hb_tag_t *script_tags,
- unsigned int *script_index)
- {
- ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- while (*script_tags)
- {
- if (g.find_script_index (*script_tags, script_index))
- return TRUE;
- script_tags++;
- }
- /* try finding 'DFLT' */
- if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
- return FALSE;
- /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
- if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
- return FALSE;
- if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
- return FALSE;
- }
- 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 */)
- {
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- return g.get_feature_tags (start_offset, feature_count, feature_tags);
- }
- 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 */)
- {
- const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
- return s.get_lang_sys_tags (start_offset, language_count, language_tags);
- }
- hb_bool_t
- hb_ot_layout_script_find_language (hb_face_t *face,
- hb_tag_t table_tag,
- unsigned int script_index,
- hb_tag_t language_tag,
- unsigned int *language_index)
- {
- ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
- const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
- if (s.find_lang_sys_index (language_tag, language_index))
- return TRUE;
- /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
- if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
- return FALSE;
- if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
- return FALSE;
- }
- 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)
- {
- const LangSys &l = get_gsubgpos_table (face, table_tag).get_script (script_index).get_lang_sys (language_index);
- if (feature_index) *feature_index = l.get_required_feature_index ();
- return l.has_required_feature ();
- }
- 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 */)
- {
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
- return l.get_feature_indexes (start_offset, feature_count, feature_indexes);
- }
- 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 */)
- {
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
- ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t));
- unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags);
- if (feature_tags) {
- unsigned int count = *feature_count;
- for (unsigned int i = 0; i < count; i++)
- feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]);
- }
- return ret;
- }
- 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)
- {
- ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
- unsigned int num_features = l.get_feature_count ();
- for (unsigned int i = 0; i < num_features; i++) {
- unsigned int f_index = l.get_feature_index (i);
- if (feature_tag == g.get_feature_tag (f_index)) {
- if (feature_index) *feature_index = f_index;
- return TRUE;
- }
- }
- if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
- return FALSE;
- }
- unsigned int
- hb_ot_layout_feature_get_lookup_indexes (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 */)
- {
- const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
- const Feature &f = g.get_feature (feature_index);
- return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
- }
- /*
- * GSUB
- */
- hb_bool_t
- hb_ot_layout_has_substitution (hb_face_t *face)
- {
- return &_get_gsub (face) != &Null(GSUB);
- }
- hb_bool_t
- hb_ot_layout_substitute_lookup (hb_face_t *face,
- hb_buffer_t *buffer,
- unsigned int lookup_index,
- hb_mask_t mask)
- {
- hb_ot_layout_context_t c;
- c.font = NULL;
- c.face = face;
- return _get_gsub (face).substitute_lookup (&c, buffer, lookup_index, mask);
- }
- /*
- * GPOS
- */
- hb_bool_t
- hb_ot_layout_has_positioning (hb_face_t *face)
- {
- return &_get_gpos (face) != &Null(GPOS);
- }
- hb_bool_t
- hb_ot_layout_position_lookup (hb_font_t *font,
- hb_face_t *face,
- hb_buffer_t *buffer,
- unsigned int lookup_index,
- hb_mask_t mask)
- {
- hb_ot_layout_context_t c;
- c.font = font;
- c.face = face;
- return _get_gpos (face).position_lookup (&c, buffer, lookup_index, mask);
- }
- void
- hb_ot_layout_position_finish (hb_face_t *face, hb_buffer_t *buffer)
- {
- /* force diacritics to have zero width */
- unsigned int count = buffer->len;
- if (hb_ot_layout_has_glyph_classes (face)) {
- const GDEF& gdef = _get_gdef (face);
- for (unsigned int i = 1; i < count; i++) {
- if (gdef.get_glyph_class (buffer->info[i].codepoint) == GDEF::MarkGlyph) {
- buffer->pos[i].x_advance = 0;
- }
- }
- } else {
- /* no GDEF classes available, so use General Category as a fallback */
- for (unsigned int i = 1; i < count; i++) {
- if (buffer->info[i].general_category() == HB_CATEGORY_NON_SPACING_MARK) {
- buffer->pos[i].x_advance = 0;
- }
- }
- }
- GPOS::position_finish (buffer);
- }
- HB_END_DECLS