+/*
+ * 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"
+
+/* 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 in order, one at a time, after initial_reordering.
+ */
+ HB_TAG('p','r','e','f'),
+ HB_TAG('a','b','v','f'),
+ HB_TAG('b','l','w','f'),
+ HB_TAG('p','s','t','f'),
+};
+static const hb_tag_t
+other_features[] =
+{
+ /*
+ * Other features.
+ * These features are applied all at once, after final_reordering.
+ */
+ HB_TAG('p','r','e','s'),
+ HB_TAG('a','b','v','s'),
+ HB_TAG('b','l','w','s'),
+ HB_TAG('p','s','t','s'),
+ /* Positioning features, though we don't care about the types. */
+ HB_TAG('d','i','s','t'),
+};
+
+static void
+setup_syllables (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer);
+static void
+reordering (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);
+
+ map->add_global_bool_feature (HB_TAG('l','o','c','l'));
+ /* The Indic specs do not require ccmp, but we apply it here since if
+ * there is a use of it, it's typically at the beginning. */
+ map->add_global_bool_feature (HB_TAG('c','c','m','p'));
+
+ 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 (NULL);
+ }
+ map->add_gsub_pause (reordering);
+ for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
+ map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
+}
+
+static void
+override_features_use (hb_ot_shape_planner_t *plan)
+{
+ plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL);
+}
+
+
+enum syllable_type_t {
+ independent_cluster,
+ virama_terminated_cluster,
+ consonant_cluster,
+ vowel_cluster,
+ number_joiner_terminated_cluster,
+ numeral_cluster,
+ symbol_cluster,
+};
+
+#include "hb-ot-shape-complex-use-machine.hh"
+
+
+static inline void
+set_use_properties (hb_glyph_info_t &info)
+{
+ hb_codepoint_t u = info.codepoint;
+ unsigned int type = hb_use_get_categories (u);
+ indic_syllabic_category_t cat = (indic_syllabic_category_t) (type & 0x7Fu);
+ indic_positional_category_t pos = (indic_positional_category_t) (type >> 8);
+ use_category_t use = USE_O;
+
+ switch (cat)
+ {
+ /* TODO */
+ }
+
+ info.use_category() = use;
+}
+
+
+static void
+setup_masks_use (const hb_ot_shape_plan_t *plan HB_UNUSED,
+ hb_buffer_t *buffer,
+ hb_font_t *font HB_UNUSED)
+{
+ 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++)
+ set_use_properties (info[i]);
+}
+
+static void
+setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED,
+ hb_font_t *font HB_UNUSED,
+ hb_buffer_t *buffer)
+{
+ find_syllables (buffer);
+}
+
+
+static void
+reorder_virama_terminated_cluster (const hb_ot_shape_plan_t *plan,
+ hb_face_t *face,
+ hb_buffer_t *buffer,
+ unsigned int start, unsigned int end)
+{
+}
+
+static void
+reorder_consonant_cluster (const hb_ot_shape_plan_t *plan,
+ hb_face_t *face,
+ hb_buffer_t *buffer,
+ unsigned int start, unsigned int end)
+{
+ hb_glyph_info_t *info = buffer->info;
+
+ /* Reorder! */
+#if 0
+ unsigned int i = start;
+ for (; i < base; i++)
+ info[i].use_position() = POS_PRE_C;
+ if (i < end)
+ {
+ info[i].use_position() = POS_BASE_C;
+ i++;
+ }
+ for (; i < end; i++)
+ {
+ if (info[i].use_category() == OT_MR) /* Pre-base reordering */
+ {
+ info[i].use_position() = POS_PRE_C;
+ continue;
+ }
+ if (info[i].use_category() == OT_VPre) /* Left matra */
+ {
+ info[i].use_position() = POS_PRE_M;
+ continue;
+ }
+
+ info[i].use_position() = POS_AFTER_MAIN;
+ }
+
+ buffer->merge_clusters (start, end);
+ /* Sit tight, rock 'n roll! */
+ hb_bubble_sort (info + start, end - start, compare_use_order);
+#endif
+}
+
+static void
+reorder_vowel_cluster (const hb_ot_shape_plan_t *plan,
+ hb_face_t *face,
+ hb_buffer_t *buffer,
+ unsigned int start, unsigned int end)
+{
+ reorder_consonant_cluster (plan, face, buffer, start, end);
+}
+
+static void
+reorder_syllable (const hb_ot_shape_plan_t *plan,
+ hb_face_t *face,
+ hb_buffer_t *buffer,
+ unsigned int start, unsigned int end)
+{
+ syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
+ switch (syllable_type) {
+#define HANDLE(X) case X: reorder_##X (plan, face, buffer, start, end); return
+ HANDLE (virama_terminated_cluster);
+ HANDLE (consonant_cluster);
+ HANDLE (vowel_cluster);
+#undef HANDLE
+#define HANDLE(X) case X: return
+ HANDLE (number_joiner_terminated_cluster);
+ HANDLE (numeral_cluster);
+ HANDLE (symbol_cluster);
+ HANDLE (independent_cluster);
+#undef HANDLE
+ }
+}
+
+static inline void
+insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
+ hb_font_t *font,
+ hb_buffer_t *buffer)
+{
+#if 0
+ /* 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};
+ dottedcircle.codepoint = 0x25CCu;
+ set_use_properties (dottedcircle);
+ dottedcircle.codepoint = dottedcircle_glyph;
+
+ 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 info = dottedcircle;
+ info.cluster = buffer->cur().cluster;
+ info.mask = buffer->cur().mask;
+ info.syllable() = buffer->cur().syllable();
+
+ buffer->output_info (info);
+ }
+ else
+ buffer->next_glyph ();
+ }
+
+ buffer->swap_buffers ();
+#endif
+}
+
+static void
+reordering (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;
+ unsigned int count = buffer->len;
+ if (unlikely (!count)) return;
+ unsigned int last = 0;
+ unsigned int last_syllable = info[0].syllable();
+ for (unsigned int i = 1; i < count; i++)
+ if (last_syllable != info[i].syllable()) {
+ reorder_syllable (plan, font->face, buffer, last, i);
+ last = i;
+ last_syllable = info[last].syllable();
+ }
+ reorder_syllable (plan, font->face, buffer, last, count);
+
+ /* Zero syllables now... */
+ for (unsigned int i = 0; i < count; i++)
+ info[i].syllable() = 0;
+
+ HB_BUFFER_DEALLOCATE_VAR (buffer, use_category);
+}
+
+
+const hb_ot_complex_shaper_t _hb_ot_complex_shaper_use =
+{
+ "use",
+ collect_features_use,
+ override_features_use,
+ NULL, /* data_create */
+ NULL, /* data_destroy */
+ NULL, /* preprocess_text */
+ HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
+ NULL, /* decompose */
+ NULL, /* compose */
+ setup_masks_use,
+ HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
+ false, /* fallback_position */
+};
projects / platform / upstream / libHarfBuzzSharp.git / commitdiff