harfbuzz/src/hb-ot-layout.cc

545 lines
17 KiB
C++
Raw Normal View History

2008-01-24 09:11:09 +01:00
/*
2011-04-21 23:14:28 +02:00
* Copyright © 1998-2004 David Turner and Werner Lemberg
* Copyright © 2006 Behdad Esfahbod
* Copyright © 2007,2008,2009 Red Hat, Inc.
2012-07-30 08:38:39 +02:00
* Copyright © 2012 Google, Inc.
2008-01-24 09:11:09 +01:00
*
2010-04-22 06:11:43 +02:00
* This is part of HarfBuzz, a text shaping library.
2008-01-24 09:11:09 +01:00
*
* 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
2012-07-30 08:38:39 +02:00
* Google Author(s): Behdad Esfahbod
2008-01-24 09:11:09 +01:00
*/
#include "hb-ot-layout-private.hh"
2008-01-24 09:11:09 +01:00
#include "hb-ot-layout-gdef-table.hh"
#include "hb-ot-layout-gsub-table.hh"
#include "hb-ot-layout-gpos-table.hh"
#include "hb-ot-maxp-table.hh"
2008-01-24 09:11:09 +01:00
#include <stdlib.h>
2008-01-24 12:03:45 +01:00
#include <string.h>
2010-07-23 21:11:18 +02:00
HB_SHAPER_DATA_ENSURE_DECLARE(ot, face)
hb_ot_layout_t *
_hb_ot_layout_create (hb_face_t *face)
{
hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
2012-07-31 01:31:17 +02:00
if (unlikely (!layout))
return NULL;
layout->gdef_blob = OT::Sanitizer<OT::GDEF>::sanitize (face->reference_table (HB_OT_TAG_GDEF));
layout->gdef = OT::Sanitizer<OT::GDEF>::lock_instance (layout->gdef_blob);
2009-08-04 04:01:47 +02:00
layout->gsub_blob = OT::Sanitizer<OT::GSUB>::sanitize (face->reference_table (HB_OT_TAG_GSUB));
layout->gsub = OT::Sanitizer<OT::GSUB>::lock_instance (layout->gsub_blob);
2009-08-04 04:01:47 +02:00
layout->gpos_blob = OT::Sanitizer<OT::GPOS>::sanitize (face->reference_table (HB_OT_TAG_GPOS));
layout->gpos = OT::Sanitizer<OT::GPOS>::lock_instance (layout->gpos_blob);
layout->gsub_lookup_count = layout->gsub->get_lookup_count ();
layout->gpos_lookup_count = layout->gpos->get_lookup_count ();
layout->gsub_digests = (hb_set_digest_t *) calloc (layout->gsub->get_lookup_count (), sizeof (hb_set_digest_t));
layout->gpos_digests = (hb_set_digest_t *) calloc (layout->gpos->get_lookup_count (), sizeof (hb_set_digest_t));
if (unlikely ((layout->gsub_lookup_count && !layout->gsub_digests) ||
(layout->gpos_lookup_count && !layout->gpos_digests)))
{
_hb_ot_layout_destroy (layout);
return NULL;
}
for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
layout->gsub->add_coverage (&layout->gsub_digests[i], i);
for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
layout->gpos->add_coverage (&layout->gpos_digests[i], i);
return layout;
2009-07-28 21:43:34 +02:00
}
void
_hb_ot_layout_destroy (hb_ot_layout_t *layout)
2008-01-24 09:11:09 +01:00
{
2009-08-04 04:01:47 +02:00
hb_blob_destroy (layout->gdef_blob);
hb_blob_destroy (layout->gsub_blob);
hb_blob_destroy (layout->gpos_blob);
2009-08-05 03:32:06 +02:00
free (layout->gsub_digests);
free (layout->gpos_digests);
2010-09-22 23:38:44 +02:00
free (layout);
}
2009-07-28 21:43:34 +02:00
static inline const OT::GDEF&
_get_gdef (hb_face_t *face)
{
if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GDEF);
return *hb_ot_layout_from_face (face)->gdef;
}
static inline const OT::GSUB&
_get_gsub (hb_face_t *face)
2008-01-24 09:11:09 +01:00
{
if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GSUB);
return *hb_ot_layout_from_face (face)->gsub;
2008-01-24 09:11:09 +01:00
}
static inline const OT::GPOS&
_get_gpos (hb_face_t *face)
{
if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GPOS);
return *hb_ot_layout_from_face (face)->gpos;
}
2008-01-25 01:13:50 +01:00
/*
* GDEF
*/
hb_bool_t
hb_ot_layout_has_glyph_classes (hb_face_t *face)
2008-01-25 01:13:50 +01:00
{
return _get_gdef (face).has_glyph_classes ();
2008-01-25 01:13:50 +01:00
}
hb_ot_layout_glyph_class_t
hb_ot_layout_get_glyph_class (hb_face_t *face,
hb_codepoint_t glyph)
{
return (hb_ot_layout_glyph_class_t) _get_gdef (face).get_glyph_class (glyph);
}
2010-11-03 20:28:56 +01:00
void
hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
hb_ot_layout_glyph_class_t klass,
hb_set_t *glyphs /* OUT */)
{
return _get_gdef (face).get_glyphs_in_class (klass, glyphs);
}
unsigned int
2009-08-02 23:41:36 +02:00
hb_ot_layout_get_attach_points (hb_face_t *face,
2009-05-26 18:24:16 +02:00
hb_codepoint_t glyph,
unsigned int start_offset,
2009-05-26 18:24:16 +02:00
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);
2009-05-26 18:40:10 +02:00
}
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 */,
int *caret_array /* OUT */)
2009-05-26 18:40:10 +02:00
{
return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
2009-05-26 18:24:16 +02:00
}
/*
* GSUB/GPOS
*/
static const OT::GSUBGPOS&
get_gsubgpos_table (hb_face_t *face,
hb_tag_t table_tag)
{
2009-08-02 23:41:36 +02:00
switch (table_tag) {
case HB_OT_TAG_GSUB: return _get_gsub (face);
case HB_OT_TAG_GPOS: return _get_gpos (face);
default: return OT::Null(OT::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 OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
return g.get_script_tags (start_offset, script_count, script_tags);
}
hb_bool_t
2009-08-02 23:41:36 +02:00
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 (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
if (g.find_script_index (script_tag, script_index))
2012-06-06 02:35:40 +02:00
return true;
/* try finding 'DFLT' */
if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
2012-06-06 02:35:40 +02:00
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))
2012-06-06 02:35:40 +02:00
return false;
if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
2012-06-06 02:35:40 +02:00
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,
2011-07-31 02:57:01 +02:00
unsigned int *script_index,
hb_tag_t *chosen_script)
{
ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
while (*script_tags)
{
2011-07-31 02:57:01 +02:00
if (g.find_script_index (*script_tags, script_index)) {
if (chosen_script)
*chosen_script = *script_tags;
2012-06-06 02:35:40 +02:00
return true;
2011-07-31 02:57:01 +02:00
}
script_tags++;
}
/* try finding 'DFLT' */
2011-07-31 02:57:01 +02:00
if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
if (chosen_script)
*chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
2012-06-06 02:35:40 +02:00
return false;
2011-07-31 02:57:01 +02:00
}
/* try with 'dflt'; MS site has had typos and many fonts use it now :( */
2011-07-31 02:57:01 +02:00
if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) {
if (chosen_script)
*chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
2012-06-06 02:35:40 +02:00
return false;
2011-07-31 02:57:01 +02:00
}
/* try with 'latn'; some old fonts put their features there even though
they're really trying to support Thai, for example :( */
#define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
if (chosen_script)
*chosen_script = HB_OT_TAG_LATIN_SCRIPT;
2012-06-06 02:35:40 +02:00
return false;
}
if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
2011-07-31 02:57:01 +02:00
if (chosen_script)
*chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
2012-06-06 02:35:40 +02:00
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 OT::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 OT::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
2009-08-02 23:41:36 +02:00
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 (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
if (s.find_lang_sys_index (language_tag, language_index))
2012-06-06 02:35:40 +02:00
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))
2012-06-06 02:35:40 +02:00
return false;
if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
2012-06-06 02:35:40 +02:00
return false;
}
hb_bool_t
2009-08-02 23:41:36 +02:00
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 OT::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 */)
2009-08-02 23:41:36 +02:00
{
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
const OT::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 */)
2009-08-02 23:41:36 +02:00
{
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
const OT::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);
2009-08-27 07:32:17 +02:00
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
2009-08-02 23:41:36 +02:00
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 (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
2009-05-17 10:59:56 +02:00
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;
2012-06-06 02:35:40 +02:00
return true;
}
}
if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
2012-06-06 02:35:40 +02:00
return false;
}
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 */)
{
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
const OT::Feature &f = g.get_feature (feature_index);
return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
}
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 */)
{
if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
OT::hb_collect_glyphs_context_t c (face, glyphs_before, glyphs_input, glyphs_after, glyphs_output);
switch (table_tag) {
case HB_OT_TAG_GSUB:
{
const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
l.collect_glyphs_lookup (&c);
return;
}
case HB_OT_TAG_GPOS:
{
const OT::PosLookup& l = hb_ot_layout_from_face (face)->gpos->get_lookup (lookup_index);
l.collect_glyphs_lookup (&c);
return;
}
}
}
2009-04-16 01:50:16 +02:00
/*
* OT::GSUB
2009-04-16 01:50:16 +02:00
*/
hb_bool_t
2009-08-02 23:41:36 +02:00
hb_ot_layout_has_substitution (hb_face_t *face)
{
return &_get_gsub (face) != &OT::Null(OT::GSUB);
2009-08-02 23:41:36 +02:00
}
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)
{
if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return false;
return hb_ot_layout_lookup_would_substitute_fast (face, lookup_index, glyphs, glyphs_length, zero_context);
}
2012-07-30 08:38:39 +02:00
hb_bool_t
hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
unsigned int lookup_index,
2012-07-30 08:38:39 +02:00
const hb_codepoint_t *glyphs,
unsigned int glyphs_length,
hb_bool_t zero_context)
2012-07-30 08:38:39 +02:00
{
if (unlikely (lookup_index >= hb_ot_layout_from_face (face)->gsub_lookup_count)) return false;
2012-09-04 21:15:19 +02:00
OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, zero_context);
const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
return l.would_apply (&c, &hb_ot_layout_from_face (face)->gsub_digests[lookup_index]);
2012-07-30 08:38:39 +02:00
}
void
hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer)
{
OT::GSUB::substitute_start (font, buffer);
}
2009-08-02 23:41:36 +02:00
hb_bool_t
hb_ot_layout_substitute_lookup (hb_font_t *font,
hb_buffer_t *buffer,
unsigned int lookup_index,
hb_mask_t mask)
2012-07-30 08:38:39 +02:00
{
if (unlikely (lookup_index >= hb_ot_layout_from_face (font->face)->gsub_lookup_count)) return false;
2012-09-04 21:15:19 +02:00
OT::hb_apply_context_t c (font, buffer, mask);
const OT::SubstLookup& l = hb_ot_layout_from_face (font->face)->gsub->get_lookup (lookup_index);
return l.apply_string (&c, &hb_ot_layout_from_face (font->face)->gsub_digests[lookup_index]);
2012-07-30 08:38:39 +02:00
}
void
hb_ot_layout_substitute_finish (hb_font_t *font, hb_buffer_t *buffer)
{
OT::GSUB::substitute_finish (font, buffer);
}
2012-04-24 05:03:12 +02:00
void
hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
unsigned int lookup_index,
hb_set_t *glyphs)
{
2012-11-23 23:55:40 +01:00
OT::hb_closure_context_t c (face, glyphs);
const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index);
l.closure (&c);
}
2009-05-18 23:43:49 +02:00
/*
* OT::GPOS
2009-05-18 23:43:49 +02:00
*/
hb_bool_t
2009-08-02 23:41:36 +02:00
hb_ot_layout_has_positioning (hb_face_t *face)
{
return &_get_gpos (face) != &OT::Null(OT::GPOS);
2009-08-02 23:41:36 +02:00
}
void
hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
{
OT::GPOS::position_start (font, buffer);
}
2009-08-02 23:41:36 +02:00
hb_bool_t
2012-07-30 08:38:39 +02:00
hb_ot_layout_position_lookup (hb_font_t *font,
hb_buffer_t *buffer,
unsigned int lookup_index,
hb_mask_t mask)
{
if (unlikely (lookup_index >= hb_ot_layout_from_face (font->face)->gpos_lookup_count)) return false;
2012-09-04 21:15:19 +02:00
OT::hb_apply_context_t c (font, buffer, mask);
const OT::PosLookup& l = hb_ot_layout_from_face (font->face)->gpos->get_lookup (lookup_index);
return l.apply_string (&c, &hb_ot_layout_from_face (font->face)->gpos_digests[lookup_index]);
2012-07-30 08:38:39 +02:00
}
void
hb_ot_layout_position_finish (hb_font_t *font, hb_buffer_t *buffer, hb_bool_t zero_width_attached_marks)
{
OT::GPOS::position_finish (font, buffer, zero_width_attached_marks);
}