--- /dev/null
+/*
+ * Copyright (C) 2009,2010 Red Hat, Inc.
+ * Copyright (C) 2010 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
+ */
+
+#ifndef HB_OT_MAP_PRIVATE_HH
+#define HB_OT_MAP_PRIVATE_HH
+
+#include "hb-ot-shape-private.hh"
+
+#include "hb-ot-layout.h"
+
+HB_BEGIN_DECLS
+
+
+#define MAX_FEATURES 100 /* FIXME */
+#define MAX_LOOKUPS 1000 /* FIXME */
+
+static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
+
+struct hb_mask_allocator_t {
+
+ struct feature_info_t {
+ hb_tag_t tag;
+ unsigned int value;
+ unsigned int seq;
+ bool global;
+
+ static int
+ cmp (const void *p1, const void *p2)
+ {
+ const feature_info_t *a = reinterpret_cast<const feature_info_t *>(p1);
+ const feature_info_t *b = reinterpret_cast<const feature_info_t *>(p2);
+
+ if (a->tag != b->tag)
+ return a->tag < b->tag ? -1 : 1;
+
+ return a->seq < b->seq ? -1 : 1;
+ }
+ };
+
+ struct feature_map_t {
+ hb_tag_t tag; /* should be first for our bsearch to work */
+ unsigned int index[2]; /* GSUB, GPOS */
+ unsigned int shift;
+ hb_mask_t mask;
+
+ static int
+ cmp (const void *p1, const void *p2)
+ {
+ const feature_map_t *a = reinterpret_cast<const feature_map_t *>(p1);
+ const feature_map_t *b = reinterpret_cast<const feature_map_t *>(p2);
+
+ return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0;
+ }
+ };
+
+ struct lookup_map_t {
+ unsigned int index;
+ hb_mask_t mask;
+
+ static int
+ cmp (const void *p1, const void *p2)
+ {
+ const lookup_map_t *a = reinterpret_cast<const lookup_map_t *>(p1);
+ const lookup_map_t *b = reinterpret_cast<const lookup_map_t *>(p2);
+
+ return a->index < b->index ? -1 : a->index > b->index ? 1 : 0;
+ }
+ };
+
+
+ void
+ add_lookups (hb_ot_shape_context_t *c,
+ unsigned int table_index,
+ unsigned int feature_index,
+ hb_mask_t mask)
+ {
+ unsigned int i = MAX_LOOKUPS - lookup_count[table_index];
+ lookup_map_t *lookups = lookup_maps[table_index] + lookup_count[table_index];
+
+ unsigned int *lookup_indices = (unsigned int *) lookups;
+
+ hb_ot_layout_feature_get_lookup_indexes (c->face,
+ table_tags[table_index],
+ feature_index,
+ 0, &i,
+ lookup_indices);
+
+ lookup_count[table_index] += i;
+
+ while (i--) {
+ lookups[i].mask = mask;
+ lookups[i].index = lookup_indices[i];
+ }
+ }
+
+
+
+
+ hb_mask_allocator_t (void) : feature_count (0) {}
+
+ void add_feature (hb_tag_t tag,
+ unsigned int value,
+ bool global)
+ {
+ feature_info_t *info = &feature_infos[feature_count++];
+ info->tag = tag;
+ info->value = value;
+ info->seq = feature_count;
+ info->global = global;
+ }
+
+ void compile (hb_ot_shape_context_t *c)
+ {
+ global_mask = 0;
+ lookup_count[0] = lookup_count[1] = 0;
+
+ if (!feature_count)
+ return;
+
+
+ /* Fetch script/language indices for GSUB/GPOS. We need these later to skip
+ * features not available in either table and not waste precious bits for them. */
+
+ const hb_tag_t *script_tags;
+ hb_tag_t language_tag;
+
+ script_tags = hb_ot_tags_from_script (c->buffer->props.script);
+ language_tag = hb_ot_tag_from_language (c->buffer->props.language);
+
+ unsigned int script_index[2], language_index[2];
+ for (unsigned int table_index = 0; table_index < 2; table_index++) {
+ hb_tag_t table_tag = table_tags[table_index];
+ hb_ot_layout_table_choose_script (c->face, table_tag, script_tags, &script_index[table_index]);
+ hb_ot_layout_script_find_language (c->face, table_tag, script_index[table_index], language_tag, &language_index[table_index]);
+ }
+
+
+ /* Sort the features so we can bsearch later */
+ qsort (feature_infos, feature_count, sizeof (feature_infos[0]), feature_info_t::cmp);
+
+ /* Remove dups, let later-occurring features override earlier ones. */
+ unsigned int j = 0;
+ for (unsigned int i = 1; i < feature_count; i++)
+ if (feature_infos[i].tag != feature_infos[j].tag)
+ feature_infos[++j] = feature_infos[i];
+ else {
+ if (feature_infos[i].global)
+ feature_infos[j] = feature_infos[i];
+ else {
+ feature_infos[j].global = feature_infos[j].global && (feature_infos[j].value == feature_infos[i].value);
+ feature_infos[j].value = MAX (feature_infos[j].value, feature_infos[i].value);
+ }
+ }
+ feature_count = j + 1;
+
+
+ /* Allocate bits now */
+ unsigned int next_bit = 1;
+ j = 0;
+ for (unsigned int i = 0; i < feature_count; i++) {
+ const feature_info_t *info = &feature_infos[i];
+
+ unsigned int bits_needed;
+
+ if (info->global && info->value == 1)
+ /* Uses the global bit */
+ bits_needed = 0;
+ else
+ bits_needed = _hb_bit_storage (info->value);
+
+ if (!info->value || next_bit + bits_needed > 8 * sizeof (hb_mask_t))
+ continue; /* Feature disabled, or not enough bits. */
+
+
+ bool found = false;
+ unsigned int feature_index[2];
+ for (unsigned int table_index = 0; table_index < 2; table_index++)
+ found |= hb_ot_layout_language_find_feature (c->face,
+ table_tags[table_index],
+ script_index[table_index],
+ language_index[table_index],
+ info->tag,
+ &feature_index[table_index]);
+ if (!found)
+ continue;
+
+
+ feature_map_t *map = &feature_maps[j++];
+
+ map->tag = info->tag;
+ map->index[0] = feature_index[0];
+ map->index[1] = feature_index[1];
+ if (info->global && info->value == 1) {
+ /* Uses the global bit */
+ map->shift = 0;
+ map->mask = 1;
+ } else {
+ map->shift = next_bit;
+ map->mask = (1 << (next_bit + bits_needed)) - (1 << next_bit);
+ next_bit += bits_needed;
+ if (info->global)
+ global_mask |= map->mask;
+ }
+
+ }
+ feature_count = j;
+
+
+ for (unsigned int table_index = 0; table_index < 2; table_index++) {
+ hb_tag_t table_tag = table_tags[table_index];
+
+ /* Collect lookup indices for features */
+
+ unsigned int required_feature_index;
+ if (hb_ot_layout_language_get_required_feature_index (c->face,
+ table_tag,
+ script_index[table_index],
+ language_index[table_index],
+ &required_feature_index))
+ add_lookups (c, table_index, required_feature_index, 1);
+
+ for (unsigned i = 0; i < feature_count; i++)
+ add_lookups (c, table_index, feature_maps[i].index[table_index], feature_maps[i].mask);
+
+ /* Sort lookups and merge duplicates */
+
+ qsort (lookup_maps[table_index], lookup_count[table_index], sizeof (lookup_maps[table_index][0]), lookup_map_t::cmp);
+
+ if (lookup_count[table_index])
+ {
+ unsigned int j = 0;
+ for (unsigned int i = 1; i < lookup_count[table_index]; i++)
+ if (lookup_maps[table_index][i].index != lookup_maps[table_index][j].index)
+ lookup_maps[table_index][++j] = lookup_maps[table_index][i];
+ else
+ lookup_maps[table_index][j].mask |= lookup_maps[table_index][i].mask;
+ j++;
+ lookup_count[table_index] = j;
+ }
+ }
+ }
+
+ hb_mask_t get_global_mask (void) { return global_mask; }
+
+ hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift) const {
+ const feature_map_t *map = (const feature_map_t *) bsearch (&tag, feature_maps, feature_count, sizeof (feature_maps[0]), feature_map_t::cmp);
+ if (likely (map)) {
+ if (shift) *shift = map->shift;
+ return map->mask;
+ } else {
+ if (shift) *shift = 0;
+ return 0;
+ }
+ }
+
+ void substitute (hb_ot_shape_context_t *c) const {
+ for (unsigned int i = 0; i < lookup_count[0]; i++)
+ hb_ot_layout_substitute_lookup (c->face, c->buffer, lookup_maps[0][i].index, lookup_maps[0][i].mask);
+ }
+
+ void position (hb_ot_shape_context_t *c) const {
+ for (unsigned int i = 0; i < lookup_count[1]; i++)
+ hb_ot_layout_position_lookup (c->font, c->face, c->buffer, lookup_maps[1][i].index, lookup_maps[1][i].mask);
+ }
+
+ private:
+
+ hb_mask_t global_mask;
+
+ unsigned int feature_count;
+ feature_info_t feature_infos[MAX_FEATURES]; /* used before compile() only */
+ feature_map_t feature_maps[MAX_FEATURES];
+
+ lookup_map_t lookup_maps[2][MAX_LOOKUPS]; /* GSUB/GPOS */
+ unsigned int lookup_count[2];
+};
+
+
+
+HB_END_DECLS
+
+#endif /* HB_OT_MAP_PRIVATE_HH */
* Google Author(s): Behdad Esfahbod
*/
-#include "hb-ot-shape-private.h"
+#include "hb-ot-shape-private.hh"
-#include "hb-open-type-private.hh"
-
-#include "hb-ot-layout.h"
+#include "hb-ot-map-private.hh"
HB_BEGIN_DECLS
HB_TAG('r','l','i','g')
};
-#define MAX_FEATURES 100 /* FIXME */
-#define MAX_LOOKUPS 1000 /* FIXME */
-
-static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
-
-
-struct hb_mask_allocator_t {
-
- struct feature_info_t {
- hb_tag_t tag;
- unsigned int value;
- unsigned int seq;
- bool global;
-
- static int
- cmp (const void *p1, const void *p2)
- {
- const feature_info_t *a = reinterpret_cast<const feature_info_t *>(p1);
- const feature_info_t *b = reinterpret_cast<const feature_info_t *>(p2);
-
- if (a->tag != b->tag)
- return a->tag < b->tag ? -1 : 1;
-
- return a->seq < b->seq ? -1 : 1;
- }
- };
-
- struct feature_map_t {
- hb_tag_t tag; /* should be first for our bsearch to work */
- unsigned int index[2]; /* GSUB, GPOS */
- unsigned int shift;
- hb_mask_t mask;
-
- static int
- cmp (const void *p1, const void *p2)
- {
- const feature_map_t *a = reinterpret_cast<const feature_map_t *>(p1);
- const feature_map_t *b = reinterpret_cast<const feature_map_t *>(p2);
-
- return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0;
- }
- };
-
- struct lookup_map_t {
- unsigned int index;
- hb_mask_t mask;
-
- static int
- cmp (const void *p1, const void *p2)
- {
- const lookup_map_t *a = reinterpret_cast<const lookup_map_t *>(p1);
- const lookup_map_t *b = reinterpret_cast<const lookup_map_t *>(p2);
-
- return a->index < b->index ? -1 : a->index > b->index ? 1 : 0;
- }
- };
-
-
- void
- add_lookups (hb_ot_shape_context_t *c,
- unsigned int table_index,
- unsigned int feature_index,
- hb_mask_t mask)
- {
- unsigned int i = MAX_LOOKUPS - lookup_count[table_index];
- lookup_map_t *lookups = lookup_maps[table_index] + lookup_count[table_index];
-
- unsigned int *lookup_indices = (unsigned int *) lookups;
-
- hb_ot_layout_feature_get_lookup_indexes (c->face,
- table_tags[table_index],
- feature_index,
- 0, &i,
- lookup_indices);
-
- lookup_count[table_index] += i;
-
- while (i--) {
- lookups[i].mask = mask;
- lookups[i].index = lookup_indices[i];
- }
- }
-
-
-
-
- hb_mask_allocator_t (void) : feature_count (0) {}
-
- void add_feature (hb_tag_t tag,
- unsigned int value,
- bool global)
- {
- feature_info_t *info = &feature_infos[feature_count++];
- info->tag = tag;
- info->value = value;
- info->seq = feature_count;
- info->global = global;
- }
-
- void compile (hb_ot_shape_context_t *c)
- {
- global_mask = 0;
- lookup_count[0] = lookup_count[1] = 0;
-
- if (!feature_count)
- return;
-
-
- /* Fetch script/language indices for GSUB/GPOS. We need these later to skip
- * features not available in either table and not waste precious bits for them. */
-
- const hb_tag_t *script_tags;
- hb_tag_t language_tag;
-
- script_tags = hb_ot_tags_from_script (c->buffer->props.script);
- language_tag = hb_ot_tag_from_language (c->buffer->props.language);
-
- unsigned int script_index[2], language_index[2];
- for (unsigned int table_index = 0; table_index < 2; table_index++) {
- hb_tag_t table_tag = table_tags[table_index];
- hb_ot_layout_table_choose_script (c->face, table_tag, script_tags, &script_index[table_index]);
- hb_ot_layout_script_find_language (c->face, table_tag, script_index[table_index], language_tag, &language_index[table_index]);
- }
-
-
- /* Sort the features so we can bsearch later */
- qsort (feature_infos, feature_count, sizeof (feature_infos[0]), feature_info_t::cmp);
-
- /* Remove dups, let later-occurring features override earlier ones. */
- unsigned int j = 0;
- for (unsigned int i = 1; i < feature_count; i++)
- if (feature_infos[i].tag != feature_infos[j].tag)
- feature_infos[++j] = feature_infos[i];
- else {
- if (feature_infos[i].global)
- feature_infos[j] = feature_infos[i];
- else {
- feature_infos[j].global = feature_infos[j].global && (feature_infos[j].value == feature_infos[i].value);
- feature_infos[j].value = MAX (feature_infos[j].value, feature_infos[i].value);
- }
- }
- feature_count = j + 1;
-
-
- /* Allocate bits now */
- unsigned int next_bit = 1;
- j = 0;
- for (unsigned int i = 0; i < feature_count; i++) {
- const feature_info_t *info = &feature_infos[i];
-
- unsigned int bits_needed;
-
- if (info->global && info->value == 1)
- /* Uses the global bit */
- bits_needed = 0;
- else
- bits_needed = _hb_bit_storage (info->value);
-
- if (!info->value || next_bit + bits_needed > 8 * sizeof (hb_mask_t))
- continue; /* Feature disabled, or not enough bits. */
-
-
- bool found = false;
- unsigned int feature_index[2];
- for (unsigned int table_index = 0; table_index < 2; table_index++)
- found |= hb_ot_layout_language_find_feature (c->face,
- table_tags[table_index],
- script_index[table_index],
- language_index[table_index],
- info->tag,
- &feature_index[table_index]);
- if (!found)
- continue;
-
-
- feature_map_t *map = &feature_maps[j++];
-
- map->tag = info->tag;
- map->index[0] = feature_index[0];
- map->index[1] = feature_index[1];
- if (info->global && info->value == 1) {
- /* Uses the global bit */
- map->shift = 0;
- map->mask = 1;
- } else {
- map->shift = next_bit;
- map->mask = (1 << (next_bit + bits_needed)) - (1 << next_bit);
- next_bit += bits_needed;
- if (info->global)
- global_mask |= map->mask;
- }
-
- }
- feature_count = j;
-
-
- for (unsigned int table_index = 0; table_index < 2; table_index++) {
- hb_tag_t table_tag = table_tags[table_index];
-
- /* Collect lookup indices for features */
-
- unsigned int required_feature_index;
- if (hb_ot_layout_language_get_required_feature_index (c->face,
- table_tag,
- script_index[table_index],
- language_index[table_index],
- &required_feature_index))
- add_lookups (c, table_index, required_feature_index, 1);
-
- for (unsigned i = 0; i < feature_count; i++)
- add_lookups (c, table_index, feature_maps[i].index[table_index], feature_maps[i].mask);
-
- /* Sort lookups and merge duplicates */
-
- qsort (lookup_maps[table_index], lookup_count[table_index], sizeof (lookup_maps[table_index][0]), lookup_map_t::cmp);
-
- if (lookup_count[table_index])
- {
- unsigned int j = 0;
- for (unsigned int i = 1; i < lookup_count[table_index]; i++)
- if (lookup_maps[table_index][i].index != lookup_maps[table_index][j].index)
- lookup_maps[table_index][++j] = lookup_maps[table_index][i];
- else
- lookup_maps[table_index][j].mask |= lookup_maps[table_index][i].mask;
- j++;
- lookup_count[table_index] = j;
- }
- }
- }
-
- hb_mask_t get_global_mask (void) { return global_mask; }
-
- const feature_map_t *find_feature (hb_tag_t tag) const {
- static const feature_map_t off_map = { HB_TAG_NONE, {Index::NOT_FOUND_INDEX,Index::NOT_FOUND_INDEX}, 0, 0 };
- const feature_map_t *map = (const feature_map_t *) bsearch (&tag, feature_maps, feature_count, sizeof (feature_maps[0]), feature_map_t::cmp);
- return map ? map : &off_map;
- }
-
- void substitute (hb_ot_shape_context_t *c) const {
- for (unsigned int i = 0; i < lookup_count[0]; i++)
- hb_ot_layout_substitute_lookup (c->face, c->buffer, lookup_maps[0][i].index, lookup_maps[0][i].mask);
- }
-
- void position (hb_ot_shape_context_t *c) const {
- for (unsigned int i = 0; i < lookup_count[1]; i++)
- hb_ot_layout_position_lookup (c->font, c->face, c->buffer, lookup_maps[1][i].index, lookup_maps[1][i].mask);
- }
-
- private:
-
- hb_mask_t global_mask;
-
- unsigned int feature_count;
- feature_info_t feature_infos[MAX_FEATURES]; /* used before compile() only */
- feature_map_t feature_maps[MAX_FEATURES];
-
- lookup_map_t lookup_maps[2][MAX_LOOKUPS]; /* GSUB/GPOS */
- unsigned int lookup_count[2];
-};
-
static void
hb_ot_shape_collect_features (hb_ot_shape_context_t *c,
hb_mask_allocator_t *allocator)
for (unsigned int i = 0; i < c->num_features; i++)
{
hb_feature_t *feature = &c->features[i];
- const hb_mask_allocator_t::feature_map_t *map = allocator->find_feature (feature->tag);
- if (!(feature->start == 0 && feature->end == (unsigned int)-1))
- c->buffer->set_masks (feature->value << map->shift, map->mask, feature->start, feature->end);
+ if (!(feature->start == 0 && feature->end == (unsigned int)-1)) {
+ unsigned int shift;
+ hb_mask_t mask = allocator->get_mask (feature->tag, &shift);
+ c->buffer->set_masks (feature->value << shift, mask, feature->start, feature->end);
+ }
}
/* complex */
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