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cff1bc672a
harfbuzz library code from upstream harfbuzz-ng commit f51e167436a51b890ffe3f7f7920498fa287acd9; replaced HB_SCRIPT_* with MOZ_SCRIPT_* codes in gfx; adapted for changes to HB function signatures.
505 lines
14 KiB
C++
505 lines
14 KiB
C++
/*
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* Copyright © 1998-2004 David Turner and Werner Lemberg
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* Copyright © 2006 Behdad Esfahbod
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* Copyright © 2007,2008,2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#include "hb-ot-layout-private.hh"
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#include "hb-ot-layout-gdef-table.hh"
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#include "hb-ot-layout-gsub-table.hh"
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#include "hb-ot-layout-gpos-table.hh"
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#include "hb-ot-maxp-table.hh"
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#include <stdlib.h>
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#include <string.h>
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hb_ot_layout_t *
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_hb_ot_layout_create (hb_face_t *face)
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{
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/* TODO Remove this object altogether */
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hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
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layout->gdef_blob = Sanitizer<GDEF>::sanitize (hb_face_reference_table (face, HB_OT_TAG_GDEF));
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layout->gdef = Sanitizer<GDEF>::lock_instance (layout->gdef_blob);
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layout->gsub_blob = Sanitizer<GSUB>::sanitize (hb_face_reference_table (face, HB_OT_TAG_GSUB));
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layout->gsub = Sanitizer<GSUB>::lock_instance (layout->gsub_blob);
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layout->gpos_blob = Sanitizer<GPOS>::sanitize (hb_face_reference_table (face, HB_OT_TAG_GPOS));
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layout->gpos = Sanitizer<GPOS>::lock_instance (layout->gpos_blob);
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return layout;
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}
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void
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_hb_ot_layout_destroy (hb_ot_layout_t *layout)
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{
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hb_blob_destroy (layout->gdef_blob);
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hb_blob_destroy (layout->gsub_blob);
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hb_blob_destroy (layout->gpos_blob);
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free (layout);
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}
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static inline const GDEF&
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_get_gdef (hb_face_t *face)
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{
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return likely (face->ot_layout && face->ot_layout->gdef) ? *face->ot_layout->gdef : Null(GDEF);
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}
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static inline const GSUB&
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_get_gsub (hb_face_t *face)
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{
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return likely (face->ot_layout && face->ot_layout->gsub) ? *face->ot_layout->gsub : Null(GSUB);
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}
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static inline const GPOS&
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_get_gpos (hb_face_t *face)
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{
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return likely (face->ot_layout && face->ot_layout->gpos) ? *face->ot_layout->gpos : Null(GPOS);
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}
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/*
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* GDEF
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*/
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hb_bool_t
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hb_ot_layout_has_glyph_classes (hb_face_t *face)
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{
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return _get_gdef (face).has_glyph_classes ();
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}
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unsigned int
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_hb_ot_layout_get_glyph_property (hb_face_t *face,
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hb_glyph_info_t *info)
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{
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if (!info->props_cache())
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{
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const GDEF &gdef = _get_gdef (face);
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info->props_cache() = gdef.get_glyph_props (info->codepoint);
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}
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return info->props_cache();
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}
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static hb_bool_t
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_hb_ot_layout_match_properties (hb_face_t *face,
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hb_codepoint_t codepoint,
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unsigned int glyph_props,
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unsigned int lookup_props)
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{
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/* Not covered, if, for example, glyph class is ligature and
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* lookup_props includes LookupFlags::IgnoreLigatures
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*/
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if (glyph_props & lookup_props & LookupFlag::IgnoreFlags)
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return false;
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if (glyph_props & HB_OT_LAYOUT_GLYPH_CLASS_MARK)
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{
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/* If using mark filtering sets, the high short of
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* lookup_props has the set index.
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*/
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if (lookup_props & LookupFlag::UseMarkFilteringSet)
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return _get_gdef (face).mark_set_covers (lookup_props >> 16, codepoint);
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/* The second byte of lookup_props has the meaning
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* "ignore marks of attachment type different than
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* the attachment type specified."
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*/
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if (lookup_props & LookupFlag::MarkAttachmentType && glyph_props & LookupFlag::MarkAttachmentType)
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return (lookup_props & LookupFlag::MarkAttachmentType) == (glyph_props & LookupFlag::MarkAttachmentType);
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}
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return true;
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}
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hb_bool_t
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_hb_ot_layout_check_glyph_property (hb_face_t *face,
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hb_glyph_info_t *ginfo,
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unsigned int lookup_props,
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unsigned int *property_out)
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{
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unsigned int property;
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property = _hb_ot_layout_get_glyph_property (face, ginfo);
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(void) (property_out && (*property_out = property));
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return _hb_ot_layout_match_properties (face, ginfo->codepoint, property, lookup_props);
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}
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hb_bool_t
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_hb_ot_layout_skip_mark (hb_face_t *face,
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hb_glyph_info_t *ginfo,
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unsigned int lookup_props,
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unsigned int *property_out)
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{
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unsigned int property;
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property = _hb_ot_layout_get_glyph_property (face, ginfo);
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(void) (property_out && (*property_out = property));
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/* If it's a mark, skip it we don't accept it. */
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if (unlikely (property & HB_OT_LAYOUT_GLYPH_CLASS_MARK))
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return !_hb_ot_layout_match_properties (face, ginfo->codepoint, property, lookup_props);
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/* If not a mark, don't skip. */
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return false;
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}
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unsigned int
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hb_ot_layout_get_attach_points (hb_face_t *face,
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hb_codepoint_t glyph,
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unsigned int start_offset,
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unsigned int *point_count /* IN/OUT */,
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unsigned int *point_array /* OUT */)
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{
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return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
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}
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unsigned int
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hb_ot_layout_get_ligature_carets (hb_font_t *font,
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hb_direction_t direction,
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hb_codepoint_t glyph,
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unsigned int start_offset,
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unsigned int *caret_count /* IN/OUT */,
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int *caret_array /* OUT */)
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{
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return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
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}
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/*
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* GSUB/GPOS
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*/
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static const GSUBGPOS&
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get_gsubgpos_table (hb_face_t *face,
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hb_tag_t table_tag)
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{
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switch (table_tag) {
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case HB_OT_TAG_GSUB: return _get_gsub (face);
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case HB_OT_TAG_GPOS: return _get_gpos (face);
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default: return Null(GSUBGPOS);
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}
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}
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unsigned int
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hb_ot_layout_table_get_script_tags (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int start_offset,
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unsigned int *script_count /* IN/OUT */,
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hb_tag_t *script_tags /* OUT */)
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{
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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return g.get_script_tags (start_offset, script_count, script_tags);
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}
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hb_bool_t
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hb_ot_layout_table_find_script (hb_face_t *face,
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hb_tag_t table_tag,
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hb_tag_t script_tag,
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unsigned int *script_index)
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{
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ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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if (g.find_script_index (script_tag, script_index))
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return TRUE;
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/* try finding 'DFLT' */
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if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
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return FALSE;
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/* try with 'dflt'; MS site has had typos and many fonts use it now :(.
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* including many versions of DejaVu Sans Mono! */
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if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
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return FALSE;
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if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
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return FALSE;
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}
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hb_bool_t
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hb_ot_layout_table_choose_script (hb_face_t *face,
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hb_tag_t table_tag,
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const hb_tag_t *script_tags,
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unsigned int *script_index,
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hb_tag_t *chosen_script)
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{
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ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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while (*script_tags)
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{
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if (g.find_script_index (*script_tags, script_index)) {
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if (chosen_script)
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*chosen_script = *script_tags;
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return TRUE;
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}
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script_tags++;
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}
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/* try finding 'DFLT' */
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if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
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if (chosen_script)
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*chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
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return FALSE;
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}
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/* try with 'dflt'; MS site has had typos and many fonts use it now :( */
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if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) {
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if (chosen_script)
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*chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
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return FALSE;
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}
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/* try with 'latn'; some old fonts put their features there even though
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they're really trying to support Thai, for example :( */
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#define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
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if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
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if (chosen_script)
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*chosen_script = HB_OT_TAG_LATIN_SCRIPT;
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return FALSE;
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}
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if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
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if (chosen_script)
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*chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
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return FALSE;
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}
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unsigned int
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hb_ot_layout_table_get_feature_tags (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int start_offset,
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unsigned int *feature_count /* IN/OUT */,
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hb_tag_t *feature_tags /* OUT */)
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{
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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return g.get_feature_tags (start_offset, feature_count, feature_tags);
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}
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unsigned int
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hb_ot_layout_script_get_language_tags (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int script_index,
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unsigned int start_offset,
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unsigned int *language_count /* IN/OUT */,
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hb_tag_t *language_tags /* OUT */)
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{
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const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
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return s.get_lang_sys_tags (start_offset, language_count, language_tags);
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}
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hb_bool_t
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hb_ot_layout_script_find_language (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int script_index,
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hb_tag_t language_tag,
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unsigned int *language_index)
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{
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ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
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const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
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if (s.find_lang_sys_index (language_tag, language_index))
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return TRUE;
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/* try with 'dflt'; MS site has had typos and many fonts use it now :( */
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if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
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return FALSE;
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if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
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return FALSE;
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}
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hb_bool_t
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hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int script_index,
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unsigned int language_index,
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unsigned int *feature_index)
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{
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const LangSys &l = get_gsubgpos_table (face, table_tag).get_script (script_index).get_lang_sys (language_index);
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if (feature_index) *feature_index = l.get_required_feature_index ();
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return l.has_required_feature ();
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}
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unsigned int
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hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int script_index,
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unsigned int language_index,
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unsigned int start_offset,
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unsigned int *feature_count /* IN/OUT */,
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unsigned int *feature_indexes /* OUT */)
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{
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
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return l.get_feature_indexes (start_offset, feature_count, feature_indexes);
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}
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unsigned int
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hb_ot_layout_language_get_feature_tags (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int script_index,
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unsigned int language_index,
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unsigned int start_offset,
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unsigned int *feature_count /* IN/OUT */,
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hb_tag_t *feature_tags /* OUT */)
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{
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
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ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t));
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unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags);
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if (feature_tags) {
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unsigned int count = *feature_count;
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for (unsigned int i = 0; i < count; i++)
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feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]);
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}
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return ret;
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}
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hb_bool_t
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hb_ot_layout_language_find_feature (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int script_index,
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unsigned int language_index,
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hb_tag_t feature_tag,
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unsigned int *feature_index)
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{
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ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
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unsigned int num_features = l.get_feature_count ();
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for (unsigned int i = 0; i < num_features; i++) {
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unsigned int f_index = l.get_feature_index (i);
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if (feature_tag == g.get_feature_tag (f_index)) {
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if (feature_index) *feature_index = f_index;
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return TRUE;
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}
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}
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if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
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return FALSE;
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}
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unsigned int
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hb_ot_layout_feature_get_lookup_indexes (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int feature_index,
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unsigned int start_offset,
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unsigned int *lookup_count /* IN/OUT */,
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unsigned int *lookup_indexes /* OUT */)
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{
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const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
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const Feature &f = g.get_feature (feature_index);
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return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
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}
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/*
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* GSUB
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*/
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hb_bool_t
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hb_ot_layout_has_substitution (hb_face_t *face)
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{
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return &_get_gsub (face) != &Null(GSUB);
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}
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void
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hb_ot_layout_substitute_start (hb_buffer_t *buffer)
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{
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GSUB::substitute_start (buffer);
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}
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hb_bool_t
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hb_ot_layout_substitute_lookup (hb_face_t *face,
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hb_buffer_t *buffer,
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unsigned int lookup_index,
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hb_mask_t mask)
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{
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return _get_gsub (face).substitute_lookup (face, buffer, lookup_index, mask);
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}
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void
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hb_ot_layout_substitute_finish (hb_buffer_t *buffer HB_UNUSED)
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{
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GSUB::substitute_finish (buffer);
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}
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/*
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* GPOS
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*/
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hb_bool_t
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hb_ot_layout_has_positioning (hb_face_t *face)
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{
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return &_get_gpos (face) != &Null(GPOS);
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}
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void
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hb_ot_layout_position_start (hb_buffer_t *buffer)
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{
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GPOS::position_start (buffer);
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}
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hb_bool_t
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hb_ot_layout_position_lookup (hb_font_t *font,
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hb_buffer_t *buffer,
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unsigned int lookup_index,
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hb_mask_t mask)
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{
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return _get_gpos (font->face).position_lookup (font, buffer, lookup_index, mask);
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}
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void
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hb_ot_layout_position_finish (hb_buffer_t *buffer)
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{
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GPOS::position_finish (buffer);
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}
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