--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ot-layout.cc Mon Nov 23 09:58:44 2015 -0800
@@ -0,0 +1,1058 @@
+/*
+ * Copyright © 1998-2004 David Turner and Werner Lemberg
+ * Copyright © 2006 Behdad Esfahbod
+ * Copyright © 2007,2008,2009 Red Hat, Inc.
+ * Copyright © 2012,2013 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): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-open-type-private.hh"
+#include "hb-ot-layout-private.hh"
+
+#include "hb-ot-layout-gdef-table.hh"
+#include "hb-ot-layout-gsub-table.hh"
+#include "hb-ot-layout-gpos-table.hh"
+#include "hb-ot-layout-jstf-table.hh"
+
+#include "hb-ot-map-private.hh"
+
+#include <stdlib.h>
+#include <string.h>
+
+
+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));
+ 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);
+
+ 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);
+
+ 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_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gsub->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
+ layout->gpos_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gpos->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
+
+ if (unlikely ((layout->gsub_lookup_count && !layout->gsub_accels) ||
+ (layout->gpos_lookup_count && !layout->gpos_accels)))
+ {
+ _hb_ot_layout_destroy (layout);
+ return NULL;
+ }
+
+ for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
+ layout->gsub_accels[i].init (layout->gsub->get_lookup (i));
+ for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
+ layout->gpos_accels[i].init (layout->gpos->get_lookup (i));
+
+ return layout;
+}
+
+void
+_hb_ot_layout_destroy (hb_ot_layout_t *layout)
+{
+ for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
+ layout->gsub_accels[i].fini ();
+ for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
+ layout->gpos_accels[i].fini ();
+
+ free (layout->gsub_accels);
+ free (layout->gpos_accels);
+
+ hb_blob_destroy (layout->gdef_blob);
+ hb_blob_destroy (layout->gsub_blob);
+ hb_blob_destroy (layout->gpos_blob);
+
+ free (layout);
+}
+
+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)
+{
+ if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GSUB);
+ return *hb_ot_layout_from_face (face)->gsub;
+}
+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;
+}
+
+
+/*
+ * GDEF
+ */
+
+hb_bool_t
+hb_ot_layout_has_glyph_classes (hb_face_t *face)
+{
+ return _get_gdef (face).has_glyph_classes ();
+}
+
+/**
+ * Since: 0.9.7
+ **/
+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);
+}
+
+/**
+ * Since: 0.9.7
+ **/
+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
+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_direction_t direction,
+ hb_codepoint_t glyph,
+ unsigned int start_offset,
+ unsigned int *caret_count /* IN/OUT */,
+ int *caret_array /* OUT */)
+{
+ return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
+}
+
+
+/*
+ * GSUB/GPOS
+ */
+
+static const OT::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 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);
+}
+
+#define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
+
+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 (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))
+ 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;
+
+ /* try with 'latn'; some old fonts put their features there even though
+ they're really trying to support Thai, for example :( */
+ if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, 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,
+ 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)
+ {
+ if (g.find_script_index (*script_tags, script_index)) {
+ if (chosen_script)
+ *chosen_script = *script_tags;
+ return true;
+ }
+ script_tags++;
+ }
+
+ /* try finding 'DFLT' */
+ if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
+ if (chosen_script)
+ *chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
+ 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)) {
+ if (chosen_script)
+ *chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
+ return false;
+ }
+
+ /* try with 'latn'; some old fonts put their features there even though
+ they're really trying to support Thai, for example :( */
+ if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
+ if (chosen_script)
+ *chosen_script = HB_OT_TAG_LATIN_SCRIPT;
+ return false;
+ }
+
+ if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
+ if (chosen_script)
+ *chosen_script = 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 OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
+
+ return g.get_feature_tags (start_offset, feature_count, feature_tags);
+}
+
+hb_bool_t
+hb_ot_layout_table_find_feature (hb_face_t *face,
+ hb_tag_t table_tag,
+ 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);
+
+ unsigned int num_features = g.get_feature_count ();
+ for (unsigned int i = 0; i < num_features; i++)
+ {
+ if (feature_tag == g.get_feature_tag (i)) {
+ if (feature_index) *feature_index = i;
+ return true;
+ }
+ }
+
+ if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
+ return false;
+}
+
+
+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
+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))
+ 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)
+{
+ return hb_ot_layout_language_get_required_feature (face,
+ table_tag,
+ script_index,
+ language_index,
+ feature_index,
+ NULL);
+}
+
+/**
+ * Since: 0.9.30
+ **/
+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,
+ hb_tag_t *feature_tag)
+{
+ const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
+ const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
+
+ unsigned int index = l.get_required_feature_index ();
+ if (feature_index) *feature_index = index;
+ if (feature_tag) *feature_tag = g.get_feature_tag (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 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 */)
+{
+ 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);
+
+ 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 (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);
+
+ 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;
+}
+
+/**
+ * Since: 0.9.7
+ **/
+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);
+}
+
+/**
+ * Since: 0.9.22
+ **/
+unsigned int
+hb_ot_layout_table_get_lookup_count (hb_face_t *face,
+ hb_tag_t table_tag)
+{
+ switch (table_tag)
+ {
+ case HB_OT_TAG_GSUB:
+ {
+ return hb_ot_layout_from_face (face)->gsub_lookup_count;
+ }
+ case HB_OT_TAG_GPOS:
+ {
+ return hb_ot_layout_from_face (face)->gpos_lookup_count;
+ }
+ }
+ return 0;
+}
+
+static void
+_hb_ot_layout_collect_lookups_lookups (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int feature_index,
+ hb_set_t *lookup_indexes /* OUT */)
+{
+ unsigned int lookup_indices[32];
+ unsigned int offset, len;
+
+ offset = 0;
+ do {
+ len = ARRAY_LENGTH (lookup_indices);
+ hb_ot_layout_feature_get_lookups (face,
+ table_tag,
+ feature_index,
+ offset, &len,
+ lookup_indices);
+
+ for (unsigned int i = 0; i < len; i++)
+ lookup_indexes->add (lookup_indices[i]);
+
+ offset += len;
+ } while (len == ARRAY_LENGTH (lookup_indices));
+}
+
+static void
+_hb_ot_layout_collect_lookups_features (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ unsigned int language_index,
+ const hb_tag_t *features,
+ hb_set_t *lookup_indexes /* OUT */)
+{
+ if (!features)
+ {
+ unsigned int required_feature_index;
+ if (hb_ot_layout_language_get_required_feature (face,
+ table_tag,
+ script_index,
+ language_index,
+ &required_feature_index,
+ NULL))
+ _hb_ot_layout_collect_lookups_lookups (face,
+ table_tag,
+ required_feature_index,
+ lookup_indexes);
+
+ /* All features */
+ unsigned int feature_indices[32];
+ unsigned int offset, len;
+
+ offset = 0;
+ do {
+ len = ARRAY_LENGTH (feature_indices);
+ hb_ot_layout_language_get_feature_indexes (face,
+ table_tag,
+ script_index,
+ language_index,
+ offset, &len,
+ feature_indices);
+
+ for (unsigned int i = 0; i < len; i++)
+ _hb_ot_layout_collect_lookups_lookups (face,
+ table_tag,
+ feature_indices[i],
+ lookup_indexes);
+
+ offset += len;
+ } while (len == ARRAY_LENGTH (feature_indices));
+ }
+ else
+ {
+ for (; *features; features++)
+ {
+ unsigned int feature_index;
+ if (hb_ot_layout_language_find_feature (face,
+ table_tag,
+ script_index,
+ language_index,
+ *features,
+ &feature_index))
+ _hb_ot_layout_collect_lookups_lookups (face,
+ table_tag,
+ feature_index,
+ lookup_indexes);
+ }
+ }
+}
+
+static void
+_hb_ot_layout_collect_lookups_languages (hb_face_t *face,
+ hb_tag_t table_tag,
+ unsigned int script_index,
+ const hb_tag_t *languages,
+ const hb_tag_t *features,
+ hb_set_t *lookup_indexes /* OUT */)
+{
+ _hb_ot_layout_collect_lookups_features (face,
+ table_tag,
+ script_index,
+ HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
+ features,
+ lookup_indexes);
+
+ if (!languages)
+ {
+ /* All languages */
+ unsigned int count = hb_ot_layout_script_get_language_tags (face,
+ table_tag,
+ script_index,
+ 0, NULL, NULL);
+ for (unsigned int language_index = 0; language_index < count; language_index++)
+ _hb_ot_layout_collect_lookups_features (face,
+ table_tag,
+ script_index,
+ language_index,
+ features,
+ lookup_indexes);
+ }
+ else
+ {
+ for (; *languages; languages++)
+ {
+ unsigned int language_index;
+ if (hb_ot_layout_script_find_language (face,
+ table_tag,
+ script_index,
+ *languages,
+ &language_index))
+ _hb_ot_layout_collect_lookups_features (face,
+ table_tag,
+ script_index,
+ language_index,
+ features,
+ lookup_indexes);
+ }
+ }
+}
+
+/**
+ * Since: 0.9.8
+ **/
+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 */)
+{
+ if (!scripts)
+ {
+ /* All scripts */
+ unsigned int count = hb_ot_layout_table_get_script_tags (face,
+ table_tag,
+ 0, NULL, NULL);
+ for (unsigned int script_index = 0; script_index < count; script_index++)
+ _hb_ot_layout_collect_lookups_languages (face,
+ table_tag,
+ script_index,
+ languages,
+ features,
+ lookup_indexes);
+ }
+ else
+ {
+ for (; *scripts; scripts++)
+ {
+ unsigned int script_index;
+ if (hb_ot_layout_table_find_script (face,
+ table_tag,
+ *scripts,
+ &script_index))
+ _hb_ot_layout_collect_lookups_languages (face,
+ table_tag,
+ script_index,
+ languages,
+ features,
+ lookup_indexes);
+ }
+ }
+}
+
+/**
+ * Since: 0.9.7
+ **/
+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 (&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 (&c);
+ return;
+ }
+ }
+}
+
+
+/*
+ * OT::GSUB
+ */
+
+hb_bool_t
+hb_ot_layout_has_substitution (hb_face_t *face)
+{
+ return &_get_gsub (face) != &OT::Null(OT::GSUB);
+}
+
+/**
+ * Since: 0.9.7
+ **/
+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);
+}
+
+hb_bool_t
+hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
+ unsigned int lookup_index,
+ const hb_codepoint_t *glyphs,
+ unsigned int glyphs_length,
+ hb_bool_t zero_context)
+{
+ if (unlikely (lookup_index >= hb_ot_layout_from_face (face)->gsub_lookup_count)) return false;
+ 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_accels[lookup_index]);
+}
+
+void
+hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer)
+{
+ OT::GSUB::substitute_start (font, buffer);
+}
+
+void
+hb_ot_layout_substitute_finish (hb_font_t *font, hb_buffer_t *buffer)
+{
+ OT::GSUB::substitute_finish (font, buffer);
+}
+
+/**
+ * Since: 0.9.7
+ **/
+void
+hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
+ unsigned int lookup_index,
+ hb_set_t *glyphs)
+{
+ OT::hb_closure_context_t c (face, glyphs);
+
+ const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index);
+
+ l.closure (&c);
+}
+
+/*
+ * OT::GPOS
+ */
+
+hb_bool_t
+hb_ot_layout_has_positioning (hb_face_t *face)
+{
+ return &_get_gpos (face) != &OT::Null(OT::GPOS);
+}
+
+void
+hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
+{
+ OT::GPOS::position_start (font, buffer);
+}
+
+void
+hb_ot_layout_position_finish (hb_font_t *font, hb_buffer_t *buffer)
+{
+ OT::GPOS::position_finish (font, buffer);
+}
+
+/**
+ * Since: 0.9.10
+ **/
+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 */
+ unsigned int *subfamily_name_id, /* OUT. May be NULL */
+ unsigned int *range_start, /* OUT. May be NULL */
+ unsigned int *range_end /* OUT. May be NULL */)
+{
+ const OT::GPOS &gpos = _get_gpos (face);
+ const hb_tag_t tag = HB_TAG ('s','i','z','e');
+
+ unsigned int num_features = gpos.get_feature_count ();
+ for (unsigned int i = 0; i < num_features; i++)
+ {
+ if (tag == gpos.get_feature_tag (i))
+ {
+ const OT::Feature &f = gpos.get_feature (i);
+ const OT::FeatureParamsSize ¶ms = f.get_feature_params ().get_size_params (tag);
+
+ if (params.designSize)
+ {
+#define PARAM(a, A) if (a) *a = params.A
+ PARAM (design_size, designSize);
+ PARAM (subfamily_id, subfamilyID);
+ PARAM (subfamily_name_id, subfamilyNameID);
+ PARAM (range_start, rangeStart);
+ PARAM (range_end, rangeEnd);
+#undef PARAM
+
+ return true;
+ }
+ }
+ }
+
+#define PARAM(a, A) if (a) *a = 0
+ PARAM (design_size, designSize);
+ PARAM (subfamily_id, subfamilyID);
+ PARAM (subfamily_name_id, subfamilyNameID);
+ PARAM (range_start, rangeStart);
+ PARAM (range_end, rangeEnd);
+#undef PARAM
+
+ return false;
+}
+
+
+/*
+ * Parts of different types are implemented here such that they have direct
+ * access to GSUB/GPOS lookups.
+ */
+
+
+struct GSUBProxy
+{
+ static const unsigned int table_index = 0;
+ static const bool inplace = false;
+ typedef OT::SubstLookup Lookup;
+
+ GSUBProxy (hb_face_t *face) :
+ table (*hb_ot_layout_from_face (face)->gsub),
+ accels (hb_ot_layout_from_face (face)->gsub_accels) {}
+
+ const OT::GSUB &table;
+ const hb_ot_layout_lookup_accelerator_t *accels;
+};
+
+struct GPOSProxy
+{
+ static const unsigned int table_index = 1;
+ static const bool inplace = true;
+ typedef OT::PosLookup Lookup;
+
+ GPOSProxy (hb_face_t *face) :
+ table (*hb_ot_layout_from_face (face)->gpos),
+ accels (hb_ot_layout_from_face (face)->gpos_accels) {}
+
+ const OT::GPOS &table;
+ const hb_ot_layout_lookup_accelerator_t *accels;
+};
+
+
+template <typename Obj>
+static inline bool
+apply_forward (OT::hb_apply_context_t *c,
+ const Obj &obj,
+ const hb_ot_layout_lookup_accelerator_t &accel)
+{
+ bool ret = false;
+ hb_buffer_t *buffer = c->buffer;
+ while (buffer->idx < buffer->len)
+ {
+ if (accel.may_have (buffer->cur().codepoint) &&
+ (buffer->cur().mask & c->lookup_mask) &&
+ c->check_glyph_property (&buffer->cur(), c->lookup_props) &&
+ obj.apply (c))
+ ret = true;
+ else
+ buffer->next_glyph ();
+ }
+ return ret;
+}
+
+template <typename Obj>
+static inline bool
+apply_backward (OT::hb_apply_context_t *c,
+ const Obj &obj,
+ const hb_ot_layout_lookup_accelerator_t &accel)
+{
+ bool ret = false;
+ hb_buffer_t *buffer = c->buffer;
+ do
+ {
+ if (accel.may_have (buffer->cur().codepoint) &&
+ (buffer->cur().mask & c->lookup_mask) &&
+ c->check_glyph_property (&buffer->cur(), c->lookup_props) &&
+ obj.apply (c))
+ ret = true;
+ /* The reverse lookup doesn't "advance" cursor (for good reason). */
+ buffer->idx--;
+
+ }
+ while ((int) buffer->idx >= 0);
+ return ret;
+}
+
+struct hb_apply_forward_context_t :
+ OT::hb_dispatch_context_t<hb_apply_forward_context_t, bool, HB_DEBUG_APPLY>
+{
+ inline const char *get_name (void) { return "APPLY_FWD"; }
+ template <typename T>
+ inline return_t dispatch (const T &obj) { return apply_forward (c, obj, accel); }
+ static return_t default_return_value (void) { return false; }
+ bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return true; }
+
+ hb_apply_forward_context_t (OT::hb_apply_context_t *c_,
+ const hb_ot_layout_lookup_accelerator_t &accel_) :
+ c (c_),
+ accel (accel_),
+ debug_depth (0) {}
+
+ OT::hb_apply_context_t *c;
+ const hb_ot_layout_lookup_accelerator_t &accel;
+ unsigned int debug_depth;
+};
+
+template <typename Proxy>
+static inline void
+apply_string (OT::hb_apply_context_t *c,
+ const typename Proxy::Lookup &lookup,
+ const hb_ot_layout_lookup_accelerator_t &accel)
+{
+ hb_buffer_t *buffer = c->buffer;
+
+ if (unlikely (!buffer->len || !c->lookup_mask))
+ return;
+
+ c->set_lookup_props (lookup.get_props ());
+
+ if (likely (!lookup.is_reverse ()))
+ {
+ /* in/out forward substitution/positioning */
+ if (Proxy::table_index == 0)
+ buffer->clear_output ();
+ buffer->idx = 0;
+
+ bool ret;
+ if (lookup.get_subtable_count () == 1)
+ {
+ hb_apply_forward_context_t c_forward (c, accel);
+ ret = lookup.dispatch (&c_forward);
+ }
+ else
+ ret = apply_forward (c, lookup, accel);
+ if (ret)
+ {
+ if (!Proxy::inplace)
+ buffer->swap_buffers ();
+ else
+ assert (!buffer->has_separate_output ());
+ }
+ }
+ else
+ {
+ /* in-place backward substitution/positioning */
+ if (Proxy::table_index == 0)
+ buffer->remove_output ();
+ buffer->idx = buffer->len - 1;
+
+ apply_backward (c, lookup, accel);
+ }
+}
+
+template <typename Proxy>
+inline void hb_ot_map_t::apply (const Proxy &proxy,
+ const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer) const
+{
+ const unsigned int table_index = proxy.table_index;
+ unsigned int i = 0;
+ OT::hb_apply_context_t c (table_index, font, buffer);
+ c.set_recurse_func (Proxy::Lookup::apply_recurse_func);
+
+ for (unsigned int stage_index = 0; stage_index < stages[table_index].len; stage_index++) {
+ const stage_map_t *stage = &stages[table_index][stage_index];
+ for (; i < stage->last_lookup; i++)
+ {
+#if 0
+ char buf[4096];
+ hb_buffer_serialize_glyphs (buffer, 0, buffer->len,
+ buf, sizeof (buf), NULL,
+ font,
+ HB_BUFFER_SERIALIZE_FORMAT_TEXT,
+ Proxy::table_index == 0 ?
+ HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS :
+ HB_BUFFER_SERIALIZE_FLAG_DEFAULT);
+ printf ("buf: [%s]\n", buf);
+#endif
+
+ unsigned int lookup_index = lookups[table_index][i].index;
+ c.set_lookup_index (lookup_index);
+ c.set_lookup_mask (lookups[table_index][i].mask);
+ c.set_auto_zwj (lookups[table_index][i].auto_zwj);
+ apply_string<Proxy> (&c,
+ proxy.table.get_lookup (lookup_index),
+ proxy.accels[lookup_index]);
+ }
+
+ if (stage->pause_func)
+ {
+ buffer->clear_output ();
+ stage->pause_func (plan, font, buffer);
+ }
+ }
+}
+
+void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
+{
+ GSUBProxy proxy (font->face);
+ apply (proxy, plan, font, buffer);
+}
+
+void hb_ot_map_t::position (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
+{
+ GPOSProxy proxy (font->face);
+ apply (proxy, plan, font, buffer);
+}
+
+HB_INTERNAL void
+hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c,
+ const OT::SubstLookup &lookup,
+ const hb_ot_layout_lookup_accelerator_t &accel)
+{
+ apply_string<GSUBProxy> (c, lookup, accel);
+}