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+/*
+ * Copyright © 2015 Mozilla Foundation.
+ * Copyright © 2015 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.
+ *
+ * Mozilla Author(s): Jonathan Kew
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-ot-shape-complex-use-private.hh"
+#include "hb-ot-shape-complex-arabic-private.hh"
+
+/* buffer var allocations */
+#define use_category() complex_var_u8_0()
+
+
+/*
+ * Universal Shaping Engine.
+ * https://www.microsoft.com/typography/OpenTypeDev/USE/intro.htm
+ */
+
+static const hb_tag_t
+basic_features[] =
+{
+ /*
+ * Basic features.
+ * These features are applied all at once, before reordering.
+ */
+ HB_TAG('r','k','r','f'),
+ HB_TAG('a','b','v','f'),
+ HB_TAG('b','l','w','f'),
+ HB_TAG('h','a','l','f'),
+ HB_TAG('p','s','t','f'),
+ HB_TAG('v','a','t','u'),
+ HB_TAG('c','j','c','t'),
+};
+static const hb_tag_t
+arabic_features[] =
+{
+ HB_TAG('i','s','o','l'),
+ HB_TAG('i','n','i','t'),
+ HB_TAG('m','e','d','i'),
+ HB_TAG('f','i','n','a'),
+ /* The spec doesn't specify these but we apply anyway, since our Arabic shaper
+ * does. These are only used in Syriac spec. */
+ HB_TAG('m','e','d','2'),
+ HB_TAG('f','i','n','2'),
+ HB_TAG('f','i','n','3'),
+};
+/* Same order as arabic_features. Don't need Syriac stuff.*/
+enum joining_form_t {
+ ISOL,
+ INIT,
+ MEDI,
+ FINA,
+ _NONE
+};
+static const hb_tag_t
+other_features[] =
+{
+ /*
+ * Other features.
+ * These features are applied all at once, after reordering.
+ */
+ HB_TAG('a','b','v','s'),
+ HB_TAG('b','l','w','s'),
+ HB_TAG('h','a','l','n'),
+ HB_TAG('p','r','e','s'),
+ HB_TAG('p','s','t','s'),
+ /* Positioning features, though we don't care about the types. */
+ HB_TAG('d','i','s','t'),
+ HB_TAG('a','b','v','m'),
+ HB_TAG('b','l','w','m'),
+};
+
+static void
+setup_syllables (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer);
+static void
+clear_substitution_flags (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer);
+static void
+record_rphf (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer);
+static void
+record_pref (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer);
+static void
+reorder (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer);
+
+static void
+collect_features_use (hb_ot_shape_planner_t *plan)
+{
+ hb_ot_map_builder_t *map = &plan->map;
+
+ /* Do this before any lookups have been applied. */
+ map->add_gsub_pause (setup_syllables);
+
+ /* "Default glyph pre-processing group" */
+ map->add_global_bool_feature (HB_TAG('l','o','c','l'));
+ map->add_global_bool_feature (HB_TAG('c','c','m','p'));
+ map->add_global_bool_feature (HB_TAG('n','u','k','t'));
+ map->add_global_bool_feature (HB_TAG('a','k','h','n'));
+
+ /* "Reordering group" */
+ map->add_gsub_pause (clear_substitution_flags);
+ map->add_feature (HB_TAG('r','p','h','f'), 1, F_MANUAL_ZWJ);
+ map->add_gsub_pause (record_rphf);
+ map->add_gsub_pause (clear_substitution_flags);
+ map->add_feature (HB_TAG('p','r','e','f'), 1, F_GLOBAL | F_MANUAL_ZWJ);
+ map->add_gsub_pause (record_pref);
+
+ /* "Orthographic unit shaping group" */
+ for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++)
+ map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
+
+ map->add_gsub_pause (reorder);
+
+ /* "Topographical features" */
+ for (unsigned int i = 0; i < ARRAY_LENGTH (arabic_features); i++)
+ map->add_feature (arabic_features[i], 1, F_NONE);
+ map->add_gsub_pause (NULL);
+
+ /* "Standard typographic presentation" and "Positional feature application" */
+ for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
+ map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
+}
+
+struct use_shape_plan_t
+{
+ ASSERT_POD ();
+
+ hb_mask_t rphf_mask;
+
+ arabic_shape_plan_t *arabic_plan;
+};
+
+static bool
+has_arabic_joining (hb_script_t script)
+{
+ /* List of scripts that have data in arabic-table. */
+ switch ((int) script)
+ {
+ /* Unicode-1.1 additions */
+ case HB_SCRIPT_ARABIC:
+
+ /* Unicode-3.0 additions */
+ case HB_SCRIPT_MONGOLIAN:
+ case HB_SCRIPT_SYRIAC:
+
+ /* Unicode-5.0 additions */
+ case HB_SCRIPT_NKO:
+ case HB_SCRIPT_PHAGS_PA:
+
+ /* Unicode-6.0 additions */
+ case HB_SCRIPT_MANDAIC:
+
+ /* Unicode-7.0 additions */
+ case HB_SCRIPT_MANICHAEAN:
+ case HB_SCRIPT_PSALTER_PAHLAVI:
+
+ return true;
+
+ default:
+ return false;
+ }
+}
+
+static void *
+data_create_use (const hb_ot_shape_plan_t *plan)
+{
+ use_shape_plan_t *use_plan = (use_shape_plan_t *) calloc (1, sizeof (use_shape_plan_t));
+ if (unlikely (!use_plan))
+ return NULL;
+
+ use_plan->rphf_mask = plan->map.get_1_mask (HB_TAG('r','p','h','f'));
+
+ if (has_arabic_joining (plan->props.script))
+ {
+ use_plan->arabic_plan = (arabic_shape_plan_t *) data_create_arabic (plan);
+ if (unlikely (!use_plan->arabic_plan))
+ {
+ free (use_plan);
+ return NULL;
+ }
+ }
+
+ return use_plan;
+}
+
+static void
+data_destroy_use (void *data)
+{
+ use_shape_plan_t *use_plan = (use_shape_plan_t *) data;
+
+ if (use_plan->arabic_plan)
+ data_destroy_arabic (use_plan->arabic_plan);
+
+ free (data);
+}
+
+enum syllable_type_t {
+ independent_cluster,
+ virama_terminated_cluster,
+ consonant_cluster,
+ vowel_cluster,
+ number_joiner_terminated_cluster,
+ numeral_cluster,
+ symbol_cluster,
+ broken_cluster,
+};
+
+#include "hb-ot-shape-complex-use-machine.hh"
+
+
+static void
+setup_masks_use (const hb_ot_shape_plan_t *plan,
+ hb_buffer_t *buffer,
+ hb_font_t *font HB_UNUSED)
+{
+ const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
+
+ /* Do this before allocating use_category(). */
+ if (use_plan->arabic_plan)
+ {
+ setup_masks_arabic_plan (use_plan->arabic_plan, buffer, plan->props.script);
+ }
+
+ HB_BUFFER_ALLOCATE_VAR (buffer, use_category);
+
+ /* We cannot setup masks here. We save information about characters
+ * and setup masks later on in a pause-callback. */
+
+ unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
+ for (unsigned int i = 0; i < count; i++)
+ info[i].use_category() = hb_use_get_categories (info[i].codepoint);
+}
+
+static void
+setup_rphf_mask (const hb_ot_shape_plan_t *plan,
+ hb_buffer_t *buffer)
+{
+ const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
+
+ hb_mask_t mask = use_plan->rphf_mask;
+ if (!mask) return;
+
+ hb_glyph_info_t *info = buffer->info;
+
+ foreach_syllable (buffer, start, end)
+ {
+ unsigned int limit = info[start].use_category() == USE_R ? 1 : MIN (3u, end - start);
+ for (unsigned int i = start; i < start + limit; i++)
+ info[i].mask |= mask;
+ }
+}
+
+static void
+setup_topographical_masks (const hb_ot_shape_plan_t *plan,
+ hb_buffer_t *buffer)
+{
+
+ ASSERT_STATIC (INIT < 4 && ISOL < 4 && MEDI < 4 && FINA < 4);
+ hb_mask_t masks[4], all_masks = 0;
+ for (unsigned int i = 0; i < 4; i++)
+ {
+ masks[i] = plan->map.get_1_mask (arabic_features[i]);
+ if (masks[i] == plan->map.get_global_mask ())
+ masks[i] = 0;
+ all_masks |= masks[i];
+ }
+ if (!all_masks)
+ return;
+ hb_mask_t other_masks = ~all_masks;
+
+ unsigned int last_start = 0;
+ joining_form_t last_form = _NONE;
+ hb_glyph_info_t *info = buffer->info;
+ foreach_syllable (buffer, start, end)
+ {
+ syllable_type_t syllable_type = (syllable_type_t) (info[start].syllable() & 0x0F);
+ switch (syllable_type)
+ {
+ case independent_cluster:
+ case symbol_cluster:
+ /* These don't join. Nothing to do. */
+ last_form = _NONE;
+ break;
+
+ case virama_terminated_cluster:
+ case consonant_cluster:
+ case vowel_cluster:
+ case number_joiner_terminated_cluster:
+ case numeral_cluster:
+ case broken_cluster:
+
+ bool join = last_form == FINA || last_form == ISOL;
+
+ if (join)
+ {
+ /* Fixup previous syllable's form. */
+ last_form = last_form == FINA ? MEDI : INIT;
+ for (unsigned int i = last_start; i < start; i++)
+ info[i].mask = (info[i].mask & other_masks) | masks[last_form];
+ }
+
+ /* Form for this syllable. */
+ last_form = join ? FINA : ISOL;
+ for (unsigned int i = start; i < end; i++)
+ info[i].mask = (info[i].mask & other_masks) | masks[last_form];
+
+ break;
+ }
+
+ last_start = start;
+ }
+}
+
+static void
+setup_syllables (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font HB_UNUSED,
+ hb_buffer_t *buffer)
+{
+ find_syllables (buffer);
+ setup_rphf_mask (plan, buffer);
+ setup_topographical_masks (plan, buffer);
+}
+
+static void
+clear_substitution_flags (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font HB_UNUSED,
+ hb_buffer_t *buffer)
+{
+ hb_glyph_info_t *info = buffer->info;
+ unsigned int count = buffer->len;
+ for (unsigned int i = 0; i < count; i++)
+ _hb_glyph_info_clear_substituted_and_ligated_and_multiplied (&info[i]);
+}
+
+static void
+record_rphf (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer)
+{
+ const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
+
+ hb_mask_t mask = use_plan->rphf_mask;
+ if (!mask) return;
+ hb_glyph_info_t *info = buffer->info;
+
+ foreach_syllable (buffer, start, end)
+ {
+ /* Mark a substituted repha as USE_R. */
+ for (unsigned int i = start; i < end && (info[i].mask & mask); i++)
+ if (_hb_glyph_info_substituted (&info[i]))
+ {
+ info[i].use_category() = USE_R;
+ break;
+ }
+ }
+}
+
+static void
+record_pref (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer)
+{
+ hb_glyph_info_t *info = buffer->info;
+
+ foreach_syllable (buffer, start, end)
+ {
+ /* Mark a substituted pref as VPre, as they behave the same way. */
+ for (unsigned int i = start; i < end; i++)
+ if (_hb_glyph_info_substituted (&info[i]))
+ {
+ info[i].use_category() = USE_VPre;
+ break;
+ }
+ }
+}
+
+static void
+reorder_syllable (hb_buffer_t *buffer, unsigned int start, unsigned int end)
+{
+ syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
+ /* Only a few syllable types need reordering. */
+ if (unlikely (!(FLAG_SAFE (syllable_type) &
+ (FLAG (virama_terminated_cluster) |
+ FLAG (consonant_cluster) |
+ FLAG (vowel_cluster) |
+ FLAG (broken_cluster) |
+ 0))))
+ return;
+
+ hb_glyph_info_t *info = buffer->info;
+
+#define HALANT_FLAGS FLAG(USE_H)
+#define BASE_FLAGS (FLAG (USE_B) | FLAG (USE_GB) | FLAG (USE_IV))
+
+ /* Move things forward. */
+ if (info[start].use_category() == USE_R && end - start > 1)
+ {
+ /* Got a repha. Reorder it to after first base, before first halant. */
+ for (unsigned int i = start + 1; i < end; i++)
+ if (FLAG_UNSAFE (info[i].use_category()) & (HALANT_FLAGS | BASE_FLAGS))
+ {
+ /* If we hit a halant, move before it; otherwise it's a base: move to it's
+ * place, and shift things in between backward. */
+
+ if (info[i].use_category() == USE_H)
+ i--;
+
+ buffer->merge_clusters (start, i + 1);
+ hb_glyph_info_t t = info[start];
+ memmove (&info[start], &info[start + 1], (i - start) * sizeof (info[0]));
+ info[i] = t;
+
+ break;
+ }
+ }
+
+ /* Move things back. */
+ unsigned int j = end;
+ for (unsigned int i = start; i < end; i++)
+ {
+ uint32_t flag = FLAG_UNSAFE (info[i].use_category());
+ if (flag & (HALANT_FLAGS | BASE_FLAGS))
+ {
+ /* If we hit a halant, move before it; otherwise it's a base: move to it's
+ * place, and shift things in between backward. */
+ if (info[i].use_category() == USE_H)
+ j = i + 1;
+ else
+ j = i;
+ }
+ else if (((flag) & (FLAG (USE_VPre) | FLAG (USE_VMPre))) &&
+ /* Only move the first component of a MultipleSubst. */
+ 0 == _hb_glyph_info_get_lig_comp (&info[i]) &&
+ j < i)
+ {
+ buffer->merge_clusters (j, i + 1);
+ hb_glyph_info_t t = info[i];
+ memmove (&info[j + 1], &info[j], (i - j) * sizeof (info[0]));
+ info[j] = t;
+ }
+ }
+}
+
+static inline void
+insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
+ hb_font_t *font,
+ hb_buffer_t *buffer)
+{
+ /* Note: This loop is extra overhead, but should not be measurable. */
+ bool has_broken_syllables = false;
+ unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
+ for (unsigned int i = 0; i < count; i++)
+ if ((info[i].syllable() & 0x0F) == broken_cluster)
+ {
+ has_broken_syllables = true;
+ break;
+ }
+ if (likely (!has_broken_syllables))
+ return;
+
+
+ hb_codepoint_t dottedcircle_glyph;
+ if (!font->get_glyph (0x25CCu, 0, &dottedcircle_glyph))
+ return;
+
+ hb_glyph_info_t dottedcircle = {0};
+ if (!font->get_glyph (0x25CCu, 0, &dottedcircle.codepoint))
+ return;
+ dottedcircle.use_category() = hb_use_get_categories (0x25CC);
+
+ buffer->clear_output ();
+
+ buffer->idx = 0;
+
+ unsigned int last_syllable = 0;
+ while (buffer->idx < buffer->len)
+ {
+ unsigned int syllable = buffer->cur().syllable();
+ syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
+ if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
+ {
+ last_syllable = syllable;
+
+ hb_glyph_info_t ginfo = dottedcircle;
+ ginfo.cluster = buffer->cur().cluster;
+ ginfo.mask = buffer->cur().mask;
+ ginfo.syllable() = buffer->cur().syllable();
+ /* TODO Set glyph_props? */
+
+ /* Insert dottedcircle after possible Repha. */
+ while (buffer->idx < buffer->len &&
+ last_syllable == buffer->cur().syllable() &&
+ buffer->cur().use_category() == USE_R)
+ buffer->next_glyph ();
+
+ buffer->output_info (ginfo);
+ }
+ else
+ buffer->next_glyph ();
+ }
+
+ buffer->swap_buffers ();
+}
+
+static void
+reorder (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer)
+{
+ insert_dotted_circles (plan, font, buffer);
+
+ hb_glyph_info_t *info = buffer->info;
+
+ foreach_syllable (buffer, start, end)
+ reorder_syllable (buffer, start, end);
+
+ /* Zero syllables now... */
+ unsigned int count = buffer->len;
+ for (unsigned int i = 0; i < count; i++)
+ info[i].syllable() = 0;
+
+ HB_BUFFER_DEALLOCATE_VAR (buffer, use_category);
+}
+
+static bool
+compose_use (const hb_ot_shape_normalize_context_t *c,
+ hb_codepoint_t a,
+ hb_codepoint_t b,
+ hb_codepoint_t *ab)
+{
+ /* Avoid recomposing split matras. */
+ if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (c->unicode->general_category (a)))
+ return false;
+
+ return c->unicode->compose (a, b, ab);
+}
+
+
+const hb_ot_complex_shaper_t _hb_ot_complex_shaper_use =
+{
+ "use",
+ collect_features_use,
+ NULL, /* override_features */
+ data_create_use,
+ data_destroy_use,
+ NULL, /* preprocess_text */
+ HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
+ NULL, /* decompose */
+ compose_use,
+ setup_masks_use,
+ HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
+ false, /* fallback_position */
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-05 00:59:47 +0000