*/
enum {
JOINING_TYPE_U = 0,
- JOINING_TYPE_R = 1,
- JOINING_TYPE_D = 2,
+ JOINING_TYPE_L = 1,
+ JOINING_TYPE_R = 2,
+ JOINING_TYPE_D = 3,
JOINING_TYPE_C = JOINING_TYPE_D,
- JOINING_GROUP_ALAPH = 3,
- JOINING_GROUP_DALATH_RISH = 4,
- NUM_STATE_MACHINE_COLS = 5,
+ JOINING_GROUP_ALAPH = 4,
+ JOINING_GROUP_DALATH_RISH = 5,
+ NUM_STATE_MACHINE_COLS = 6,
- /* We deliberately don't have a JOINING_TYPE_L since that's unused in Unicode. */
-
- JOINING_TYPE_T = 6,
- JOINING_TYPE_X = 7 /* means: use general-category to choose between U or T. */
+ JOINING_TYPE_T = 7,
+ JOINING_TYPE_X = 8 /* means: use general-category to choose between U or T. */
};
/*
static unsigned int get_joining_type (hb_codepoint_t u, hb_unicode_general_category_t gen_cat)
{
- if (likely (hb_in_range<hb_codepoint_t> (u, JOINING_TABLE_FIRST, JOINING_TABLE_LAST))) {
- unsigned int j_type = joining_table[u - JOINING_TABLE_FIRST];
- if (likely (j_type != JOINING_TYPE_X))
- return j_type;
- }
-
- /* Mongolian joining data is not in ArabicJoining.txt yet. */
- if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x1800, 0x18AF)))
- {
- if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x1880, 0x1886)))
- return JOINING_TYPE_U;
-
- /* All letters, SIBE SYLLABLE BOUNDARY MARKER, and NIRUGU are D */
- if ((FLAG(gen_cat) & (FLAG (HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER) |
- FLAG (HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER)))
- || u == 0x1807 || u == 0x180A)
- return JOINING_TYPE_D;
- }
-
- /* 'Phags-pa joining data is not in ArabicJoining.txt yet. */
- if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xA840, 0xA872)))
- {
- if (unlikely (u == 0xA872))
- /* XXX Looks like this should be TYPE_L, but we don't support that yet! */
- return JOINING_TYPE_R;
-
- return JOINING_TYPE_D;
- }
-
- if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x200C, 0x200D)))
- {
- return u == 0x200C ? JOINING_TYPE_U : JOINING_TYPE_C;
- }
-
- return (FLAG(gen_cat) & (FLAG(HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) | FLAG(HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | FLAG(HB_UNICODE_GENERAL_CATEGORY_FORMAT))) ?
- JOINING_TYPE_T : JOINING_TYPE_U;
+ unsigned int j_type = joining_type(u);
+ if (likely (j_type != JOINING_TYPE_X))
+ return j_type;
+
+ return (FLAG(gen_cat) &
+ (FLAG(HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) |
+ FLAG(HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) |
+ FLAG(HB_UNICODE_GENERAL_CATEGORY_FORMAT))
+ ) ? JOINING_TYPE_T : JOINING_TYPE_U;
}
+#define FEATURE_IS_SYRIAC(tag) hb_in_range<unsigned char> ((unsigned char) (tag), '2', '3')
+
static const hb_tag_t arabic_features[] =
{
- HB_TAG('i','n','i','t'),
- HB_TAG('m','e','d','i'),
- HB_TAG('f','i','n','a'),
HB_TAG('i','s','o','l'),
- /* Syriac */
- HB_TAG('m','e','d','2'),
+ HB_TAG('f','i','n','a'),
HB_TAG('f','i','n','2'),
HB_TAG('f','i','n','3'),
+ HB_TAG('m','e','d','i'),
+ HB_TAG('m','e','d','2'),
+ HB_TAG('i','n','i','t'),
HB_TAG_NONE
};
/* Same order as the feature array */
enum {
- INIT,
- MEDI,
- FINA,
ISOL,
-
- /* Syriac */
- MED2,
+ FINA,
FIN2,
FIN3,
+ MEDI,
+ MED2,
+ INIT,
NONE,
uint16_t next_state;
} arabic_state_table[][NUM_STATE_MACHINE_COLS] =
{
- /* jt_U, jt_R, jt_D, jg_ALAPH, jg_DALATH_RISH */
+ /* jt_U, jt_L, jt_R, jt_D, jg_ALAPH, jg_DALATH_RISH */
/* State 0: prev was U, not willing to join. */
- { {NONE,NONE,0}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,6}, },
+ { {NONE,NONE,0}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,6}, },
/* State 1: prev was R or ISOL/ALAPH, not willing to join. */
- { {NONE,NONE,0}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,FIN2,5}, {NONE,ISOL,6}, },
+ { {NONE,NONE,0}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,FIN2,5}, {NONE,ISOL,6}, },
- /* State 2: prev was D/ISOL, willing to join. */
- { {NONE,NONE,0}, {INIT,FINA,1}, {INIT,FINA,3}, {INIT,FINA,4}, {INIT,FINA,6}, },
+ /* State 2: prev was D/L in ISOL form, willing to join. */
+ { {NONE,NONE,0}, {NONE,ISOL,2}, {INIT,FINA,1}, {INIT,FINA,3}, {INIT,FINA,4}, {INIT,FINA,6}, },
- /* State 3: prev was D/FINA, willing to join. */
- { {NONE,NONE,0}, {MEDI,FINA,1}, {MEDI,FINA,3}, {MEDI,FINA,4}, {MEDI,FINA,6}, },
+ /* State 3: prev was D in FINA form, willing to join. */
+ { {NONE,NONE,0}, {NONE,ISOL,2}, {MEDI,FINA,1}, {MEDI,FINA,3}, {MEDI,FINA,4}, {MEDI,FINA,6}, },
/* State 4: prev was FINA ALAPH, not willing to join. */
- { {NONE,NONE,0}, {MED2,ISOL,1}, {MED2,ISOL,2}, {MED2,FIN2,5}, {MED2,ISOL,6}, },
+ { {NONE,NONE,0}, {NONE,ISOL,2}, {MED2,ISOL,1}, {MED2,ISOL,2}, {MED2,FIN2,5}, {MED2,ISOL,6}, },
/* State 5: prev was FIN2/FIN3 ALAPH, not willing to join. */
- { {NONE,NONE,0}, {ISOL,ISOL,1}, {ISOL,ISOL,2}, {ISOL,FIN2,5}, {ISOL,ISOL,6}, },
+ { {NONE,NONE,0}, {NONE,ISOL,2}, {ISOL,ISOL,1}, {ISOL,ISOL,2}, {ISOL,FIN2,5}, {ISOL,ISOL,6}, },
/* State 6: prev was DALATH/RISH, not willing to join. */
- { {NONE,NONE,0}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,FIN3,5}, {NONE,ISOL,6}, }
+ { {NONE,NONE,0}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,FIN3,5}, {NONE,ISOL,6}, }
};
static void
+nuke_joiners (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer);
+
+static void
arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
hb_font_t *font,
hb_buffer_t *buffer);
{
hb_ot_map_builder_t *map = &plan->map;
- /* For Language forms (in ArabicOT speak), we do the iso/fina/medi/init together,
- * then rlig and calt each in their own stage. This makes IranNastaliq's ALLAH
- * ligature work correctly. It's unfortunate though...
+ /* We apply features according to the Arabic spec, with pauses
+ * in between most.
*
- * This also makes Arial Bold in Windows7 work. See:
+ * The pause between init/medi/... and rlig is required. See eg:
* https://bugzilla.mozilla.org/show_bug.cgi?id=644184
*
- * TODO: Add test cases for these two.
+ * The pauses between init/medi/... themselves are not necessarily
+ * needed as only one of those features is applied to any character.
+ * The only difference it makes is when fonts have contextual
+ * substitutions. We now follow the order of the spec, which makes
+ * for better experience if that's what Uniscribe is doing.
+ *
+ * At least for Arabic, looks like Uniscribe has a pause between
+ * rlig and calt. Otherwise the IranNastaliq's ALLAH ligature won't
+ * work. However, testing shows that rlig and calt are applied
+ * together for Mongolian in Uniscribe. As such, we only add a
+ * pause for Arabic, not other scripts.
*/
- map->add_bool_feature (HB_TAG('c','c','m','p'));
- map->add_bool_feature (HB_TAG('l','o','c','l'));
+ map->add_gsub_pause (nuke_joiners);
+
+ map->add_global_bool_feature (HB_TAG('c','c','m','p'));
+ map->add_global_bool_feature (HB_TAG('l','o','c','l'));
map->add_gsub_pause (NULL);
for (unsigned int i = 0; i < ARABIC_NUM_FEATURES; i++)
- map->add_bool_feature (arabic_features[i], false, i < 4); /* The first four features have fallback. */
-
- map->add_gsub_pause (NULL);
+ {
+ bool has_fallback = plan->props.script == HB_SCRIPT_ARABIC && !FEATURE_IS_SYRIAC (arabic_features[i]);
+ map->add_feature (arabic_features[i], 1, has_fallback ? F_HAS_FALLBACK : F_NONE);
+ map->add_gsub_pause (NULL);
+ }
- map->add_bool_feature (HB_TAG('r','l','i','g'), true, true);
- map->add_gsub_pause (arabic_fallback_shape);
+ map->add_feature (HB_TAG('r','l','i','g'), 1, F_GLOBAL|F_HAS_FALLBACK);
+ if (plan->props.script == HB_SCRIPT_ARABIC)
+ map->add_gsub_pause (arabic_fallback_shape);
- map->add_bool_feature (HB_TAG('c','a','l','t'));
+ map->add_global_bool_feature (HB_TAG('c','a','l','t'));
map->add_gsub_pause (NULL);
- map->add_bool_feature (HB_TAG('c','s','w','h'));
- map->add_bool_feature (HB_TAG('d','l','i','g'));
- map->add_bool_feature (HB_TAG('m','s','e','t'));
+ /* The spec includes 'cswh'. Earlier versions of Windows
+ * used to enable this by default, but testing suggests
+ * that Windows 8 and later do not enable it by default,
+ * and spec now says 'Off by default'.
+ * We disabled this in ae23c24c32.
+ * Note that IranNastaliq uses this feature extensively
+ * to fixup broken glyph sequences. Oh well...
+ * Test case: U+0643,U+0640,U+0631. */
+ //map->add_global_bool_feature (HB_TAG('c','s','w','h'));
+ map->add_global_bool_feature (HB_TAG('m','s','e','t'));
}
#include "hb-ot-shape-complex-arabic-fallback.hh"
arabic_plan->do_fallback = plan->props.script == HB_SCRIPT_ARABIC;
for (unsigned int i = 0; i < ARABIC_NUM_FEATURES; i++) {
arabic_plan->mask_array[i] = plan->map.get_1_mask (arabic_features[i]);
- if (i < 4)
- arabic_plan->do_fallback = arabic_plan->do_fallback && plan->map.needs_fallback (arabic_features[i]);
+ arabic_plan->do_fallback = arabic_plan->do_fallback &&
+ (FEATURE_IS_SYRIAC (arabic_features[i]) ||
+ plan->map.needs_fallback (arabic_features[i]));
}
return arabic_plan;
arabic_joining (hb_buffer_t *buffer)
{
unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
unsigned int prev = (unsigned int) -1, state = 0;
- HB_BUFFER_ALLOCATE_VAR (buffer, arabic_shaping_action);
-
/* Check pre-context */
- if (!(buffer->flags & HB_BUFFER_FLAG_BOT))
- for (unsigned int i = 0; i < buffer->context_len[0]; i++)
- {
- unsigned int this_type = get_joining_type (buffer->context[0][i], buffer->unicode->general_category (buffer->context[0][i]));
+ for (unsigned int i = 0; i < buffer->context_len[0]; i++)
+ {
+ unsigned int this_type = get_joining_type (buffer->context[0][i], buffer->unicode->general_category (buffer->context[0][i]));
- if (unlikely (this_type == JOINING_TYPE_T))
- continue;
+ if (unlikely (this_type == JOINING_TYPE_T))
+ continue;
- const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
- state = entry->next_state;
- break;
- }
+ const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
+ state = entry->next_state;
+ break;
+ }
for (unsigned int i = 0; i < count; i++)
{
- unsigned int this_type = get_joining_type (buffer->info[i].codepoint, _hb_glyph_info_get_general_category (&buffer->info[i]));
+ unsigned int this_type = get_joining_type (info[i].codepoint, _hb_glyph_info_get_general_category (&info[i]));
if (unlikely (this_type == JOINING_TYPE_T)) {
- buffer->info[i].arabic_shaping_action() = NONE;
+ info[i].arabic_shaping_action() = NONE;
continue;
}
const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
if (entry->prev_action != NONE && prev != (unsigned int) -1)
- buffer->info[prev].arabic_shaping_action() = entry->prev_action;
+ info[prev].arabic_shaping_action() = entry->prev_action;
- buffer->info[i].arabic_shaping_action() = entry->curr_action;
+ info[i].arabic_shaping_action() = entry->curr_action;
prev = i;
state = entry->next_state;
}
- if (!(buffer->flags & HB_BUFFER_FLAG_EOT))
- for (unsigned int i = 0; i < buffer->context_len[1]; i++)
- {
- unsigned int this_type = get_joining_type (buffer->context[1][i], buffer->unicode->general_category (buffer->context[1][i]));
-
- if (unlikely (this_type == JOINING_TYPE_T))
- continue;
+ for (unsigned int i = 0; i < buffer->context_len[1]; i++)
+ {
+ unsigned int this_type = get_joining_type (buffer->context[1][i], buffer->unicode->general_category (buffer->context[1][i]));
- const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
- if (entry->prev_action != NONE && prev != (unsigned int) -1)
- buffer->info[prev].arabic_shaping_action() = entry->prev_action;
- break;
- }
+ if (unlikely (this_type == JOINING_TYPE_T))
+ continue;
+ const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
+ if (entry->prev_action != NONE && prev != (unsigned int) -1)
+ info[prev].arabic_shaping_action() = entry->prev_action;
+ break;
+ }
+}
- HB_BUFFER_DEALLOCATE_VAR (buffer, arabic_shaping_action);
+static void
+mongolian_variation_selectors (hb_buffer_t *buffer)
+{
+ /* Copy arabic_shaping_action() from base to Mongolian variation selectors. */
+ unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
+ for (unsigned int i = 1; i < count; i++)
+ if (unlikely (hb_in_range (info[i].codepoint, 0x180Bu, 0x180Du)))
+ info[i].arabic_shaping_action() = info[i - 1].arabic_shaping_action();
}
static void
hb_buffer_t *buffer,
hb_font_t *font HB_UNUSED)
{
+ HB_BUFFER_ALLOCATE_VAR (buffer, arabic_shaping_action);
+
const arabic_shape_plan_t *arabic_plan = (const arabic_shape_plan_t *) plan->data;
arabic_joining (buffer);
+ if (plan->props.script == HB_SCRIPT_MONGOLIAN)
+ mongolian_variation_selectors (buffer);
+
unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < count; i++)
- buffer->info[i].mask |= arabic_plan->mask_array[buffer->info[i].arabic_shaping_action()];
+ info[i].mask |= arabic_plan->mask_array[info[i].arabic_shaping_action()];
+
+ HB_BUFFER_DEALLOCATE_VAR (buffer, arabic_shaping_action);
}
static void
+nuke_joiners (const hb_ot_shape_plan_t *plan HB_UNUSED,
+ hb_font_t *font HB_UNUSED,
+ hb_buffer_t *buffer)
+{
+ unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
+ for (unsigned int i = 0; i < count; i++)
+ if (_hb_glyph_info_is_zwj (&info[i]))
+ _hb_glyph_info_flip_joiners (&info[i]);
+}
+
+static void
arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
hb_font_t *font,
hb_buffer_t *buffer)
data_create_arabic,
data_destroy_arabic,
NULL, /* preprocess_text_arabic */
- NULL, /* normalization_preference */
+ HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
NULL, /* decompose */
NULL, /* compose */
setup_masks_arabic,
- true, /* zero_width_attached_marks */
+ HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
true, /* fallback_position */
};
projects / platform / upstream / harfbuzz.git / blobdiff