diff options
Diffstat (limited to 'pango/pango-context.c')
| -rw-r--r-- | pango/pango-context.c | 1153 |
1 files changed, 2 insertions, 1151 deletions
diff --git a/pango/pango-context.c b/pango/pango-context.c index 2cb3304c..d76b0ae2 100644 --- a/pango/pango-context.c +++ b/pango/pango-context.c @@ -24,6 +24,7 @@ #include <stdlib.h> #include "pango-context.h" +#include "pango-context-private.h" #include "pango-impl-utils.h" #include "pango-font-private.h" @@ -44,29 +45,6 @@ * * To obtain a `PangoContext`, use [method@Pango.FontMap.create_context]. */ -struct _PangoContext -{ - GObject parent_instance; - guint serial; - guint fontmap_serial; - - PangoLanguage *set_language; - PangoLanguage *language; - PangoDirection base_dir; - PangoGravity base_gravity; - PangoGravity resolved_gravity; - PangoGravityHint gravity_hint; - - PangoFontDescription *font_desc; - - PangoMatrix *matrix; - - PangoFontMap *font_map; - - PangoFontMetrics *metrics; - - gboolean round_glyph_positions; -}; struct _PangoContextClass { @@ -595,1133 +573,6 @@ pango_context_get_gravity_hint (PangoContext *context) return context->gravity_hint; } -/**********************************************************************/ - -static gboolean -advance_attr_iterator_to (PangoAttrIterator *iterator, - int start_index) -{ - int start_range, end_range; - - pango_attr_iterator_range (iterator, &start_range, &end_range); - - while (start_index >= end_range) - { - if (!pango_attr_iterator_next (iterator)) - return FALSE; - pango_attr_iterator_range (iterator, &start_range, &end_range); - } - - if (start_range > start_index) - g_warning ("In pango_itemize(), the cached iterator passed in " - "had already moved beyond the start_index"); - - return TRUE; -} - -/*************************************************************************** - * We cache the results of character,fontset => font in a hash table - ***************************************************************************/ - -typedef struct { - GHashTable *hash; -} FontCache; - -typedef struct { - PangoFont *font; - int position; /* position of the font in the fontset */ -} FontElement; - -static void -font_cache_destroy (FontCache *cache) -{ - g_hash_table_destroy (cache->hash); - g_slice_free (FontCache, cache); -} - -static void -font_element_destroy (FontElement *element) -{ - if (element->font) - g_object_unref (element->font); - g_slice_free (FontElement, element); -} - -static FontCache * -get_font_cache (PangoFontset *fontset) -{ - FontCache *cache; - - static GQuark cache_quark = 0; /* MT-safe */ - if (G_UNLIKELY (!cache_quark)) - cache_quark = g_quark_from_static_string ("pango-font-cache"); - -retry: - cache = g_object_get_qdata (G_OBJECT (fontset), cache_quark); - if (G_UNLIKELY (!cache)) - { - cache = g_slice_new (FontCache); - cache->hash = g_hash_table_new_full (g_direct_hash, NULL, - NULL, (GDestroyNotify)font_element_destroy); - if (!g_object_replace_qdata (G_OBJECT (fontset), cache_quark, NULL, - cache, (GDestroyNotify)font_cache_destroy, - NULL)) - { - font_cache_destroy (cache); - goto retry; - } - } - - return cache; -} - -static gboolean -font_cache_get (FontCache *cache, - gunichar wc, - PangoFont **font, - int *position) -{ - FontElement *element; - - element = g_hash_table_lookup (cache->hash, GUINT_TO_POINTER (wc)); - if (element) - { - *font = element->font; - *position = element->position; - return TRUE; - } - else - return FALSE; -} - -static void -font_cache_insert (FontCache *cache, - gunichar wc, - PangoFont *font, - int position) -{ - FontElement *element = g_slice_new (FontElement); - element->font = font ? g_object_ref (font) : NULL; - element->position = position; - - g_hash_table_insert (cache->hash, GUINT_TO_POINTER (wc), element); -} - -/**********************************************************************/ - -typedef enum { - EMBEDDING_CHANGED = 1 << 0, - SCRIPT_CHANGED = 1 << 1, - LANG_CHANGED = 1 << 2, - FONT_CHANGED = 1 << 3, - DERIVED_LANG_CHANGED = 1 << 4, - WIDTH_CHANGED = 1 << 5, - EMOJI_CHANGED = 1 << 6, -} ChangedFlags; - - - -typedef struct _PangoWidthIter PangoWidthIter; - -struct _PangoWidthIter -{ - const gchar *text_start; - const gchar *text_end; - const gchar *start; - const gchar *end; - gboolean upright; -}; - -typedef struct _ItemizeState ItemizeState; - - - -struct _ItemizeState -{ - PangoContext *context; - const char *text; - const char *end; - - const char *run_start; - const char *run_end; - - GList *result; - PangoItem *item; - - guint8 *embedding_levels; - int embedding_end_offset; - const char *embedding_end; - guint8 embedding; - - PangoGravity gravity; - PangoGravityHint gravity_hint; - PangoGravity resolved_gravity; - PangoGravity font_desc_gravity; - gboolean centered_baseline; - - PangoAttrIterator *attr_iter; - gboolean free_attr_iter; - const char *attr_end; - PangoFontDescription *font_desc; - PangoFontDescription *emoji_font_desc; - PangoLanguage *lang; - GSList *extra_attrs; - gboolean copy_extra_attrs; - - ChangedFlags changed; - - PangoScriptIter script_iter; - const char *script_end; - PangoScript script; - - PangoWidthIter width_iter; - PangoEmojiIter emoji_iter; - - PangoLanguage *derived_lang; - - PangoFontset *current_fonts; - FontCache *cache; - PangoFont *base_font; - gboolean enable_fallback; - - const char *first_space; /* first of a sequence of spaces we've seen */ - int font_position; /* position of the current font in the fontset */ -}; - -static void -update_embedding_end (ItemizeState *state) -{ - state->embedding = state->embedding_levels[state->embedding_end_offset]; - while (state->embedding_end < state->end && - state->embedding_levels[state->embedding_end_offset] == state->embedding) - { - state->embedding_end_offset++; - state->embedding_end = g_utf8_next_char (state->embedding_end); - } - - state->changed |= EMBEDDING_CHANGED; -} - -static PangoAttribute * -find_attribute (GSList *attr_list, - PangoAttrType type) -{ - GSList *node; - - for (node = attr_list; node; node = node->next) - if (((PangoAttribute *) node->data)->klass->type == type) - return (PangoAttribute *) node->data; - - return NULL; -} - -static void -update_attr_iterator (ItemizeState *state) -{ - PangoLanguage *old_lang; - PangoAttribute *attr; - int end_index; - - pango_attr_iterator_range (state->attr_iter, NULL, &end_index); - if (end_index < state->end - state->text) - state->attr_end = state->text + end_index; - else - state->attr_end = state->end; - - if (state->emoji_font_desc) - { - pango_font_description_free (state->emoji_font_desc); - state->emoji_font_desc = NULL; - } - - old_lang = state->lang; - if (state->font_desc) - pango_font_description_free (state->font_desc); - state->font_desc = pango_font_description_copy_static (state->context->font_desc); - pango_attr_iterator_get_font (state->attr_iter, state->font_desc, - &state->lang, &state->extra_attrs); - if (pango_font_description_get_set_fields (state->font_desc) & PANGO_FONT_MASK_GRAVITY) - state->font_desc_gravity = pango_font_description_get_gravity (state->font_desc); - else - state->font_desc_gravity = PANGO_GRAVITY_AUTO; - - state->copy_extra_attrs = FALSE; - - if (!state->lang) - state->lang = state->context->language; - - attr = find_attribute (state->extra_attrs, PANGO_ATTR_FALLBACK); - state->enable_fallback = (attr == NULL || ((PangoAttrInt *)attr)->value); - - attr = find_attribute (state->extra_attrs, PANGO_ATTR_GRAVITY); - state->gravity = attr == NULL ? PANGO_GRAVITY_AUTO : ((PangoAttrInt *)attr)->value; - - attr = find_attribute (state->extra_attrs, PANGO_ATTR_GRAVITY_HINT); - state->gravity_hint = attr == NULL ? state->context->gravity_hint : (PangoGravityHint)((PangoAttrInt *)attr)->value; - - state->changed |= FONT_CHANGED; - if (state->lang != old_lang) - state->changed |= LANG_CHANGED; -} - -static void -update_end (ItemizeState *state) -{ - state->run_end = state->embedding_end; - if (state->attr_end < state->run_end) - state->run_end = state->attr_end; - if (state->script_end < state->run_end) - state->run_end = state->script_end; - if (state->width_iter.end < state->run_end) - state->run_end = state->width_iter.end; - if (state->emoji_iter.end < state->run_end) - state->run_end = state->emoji_iter.end; -} - -static gboolean -width_iter_is_upright (gunichar ch) -{ - /* https://www.unicode.org/Public/11.0.0/ucd/VerticalOrientation.txt - * VO=U or Tu table generated by tools/gen-vertical-orientation-U-table.py. - * - * FIXME: In the future, If GLib supports VerticalOrientation, please use it. - */ - static const gunichar upright[][2] = { - {0x00A7, 0x00A7}, {0x00A9, 0x00A9}, {0x00AE, 0x00AE}, {0x00B1, 0x00B1}, - {0x00BC, 0x00BE}, {0x00D7, 0x00D7}, {0x00F7, 0x00F7}, {0x02EA, 0x02EB}, - {0x1100, 0x11FF}, {0x1401, 0x167F}, {0x18B0, 0x18FF}, {0x2016, 0x2016}, - {0x2020, 0x2021}, {0x2030, 0x2031}, {0x203B, 0x203C}, {0x2042, 0x2042}, - {0x2047, 0x2049}, {0x2051, 0x2051}, {0x2065, 0x2065}, {0x20DD, 0x20E0}, - {0x20E2, 0x20E4}, {0x2100, 0x2101}, {0x2103, 0x2109}, {0x210F, 0x210F}, - {0x2113, 0x2114}, {0x2116, 0x2117}, {0x211E, 0x2123}, {0x2125, 0x2125}, - {0x2127, 0x2127}, {0x2129, 0x2129}, {0x212E, 0x212E}, {0x2135, 0x213F}, - {0x2145, 0x214A}, {0x214C, 0x214D}, {0x214F, 0x2189}, {0x218C, 0x218F}, - {0x221E, 0x221E}, {0x2234, 0x2235}, {0x2300, 0x2307}, {0x230C, 0x231F}, - {0x2324, 0x2328}, {0x232B, 0x232B}, {0x237D, 0x239A}, {0x23BE, 0x23CD}, - {0x23CF, 0x23CF}, {0x23D1, 0x23DB}, {0x23E2, 0x2422}, {0x2424, 0x24FF}, - {0x25A0, 0x2619}, {0x2620, 0x2767}, {0x2776, 0x2793}, {0x2B12, 0x2B2F}, - {0x2B50, 0x2B59}, {0x2BB8, 0x2BD1}, {0x2BD3, 0x2BEB}, {0x2BF0, 0x2BFF}, - {0x2E80, 0x3007}, {0x3012, 0x3013}, {0x3020, 0x302F}, {0x3031, 0x309F}, - {0x30A1, 0x30FB}, {0x30FD, 0xA4CF}, {0xA960, 0xA97F}, {0xAC00, 0xD7FF}, - {0xE000, 0xFAFF}, {0xFE10, 0xFE1F}, {0xFE30, 0xFE48}, {0xFE50, 0xFE57}, - {0xFE5F, 0xFE62}, {0xFE67, 0xFE6F}, {0xFF01, 0xFF07}, {0xFF0A, 0xFF0C}, - {0xFF0E, 0xFF19}, {0xFF1F, 0xFF3A}, {0xFF3C, 0xFF3C}, {0xFF3E, 0xFF3E}, - {0xFF40, 0xFF5A}, {0xFFE0, 0xFFE2}, {0xFFE4, 0xFFE7}, {0xFFF0, 0xFFF8}, - {0xFFFC, 0xFFFD}, {0x10980, 0x1099F}, {0x11580, 0x115FF}, {0x11A00, 0x11AAF}, - {0x13000, 0x1342F}, {0x14400, 0x1467F}, {0x16FE0, 0x18AFF}, {0x1B000, 0x1B12F}, - {0x1B170, 0x1B2FF}, {0x1D000, 0x1D1FF}, {0x1D2E0, 0x1D37F}, {0x1D800, 0x1DAAF}, - {0x1F000, 0x1F7FF}, {0x1F900, 0x1FA6F}, {0x20000, 0x2FFFD}, {0x30000, 0x3FFFD}, - {0xF0000, 0xFFFFD}, {0x100000, 0x10FFFD} - }; - static const int max = sizeof(upright) / sizeof(upright[0]); - int st = 0; - int ed = max; - - if (ch < upright[0][0]) - return FALSE; - - while (st <= ed) - { - int mid = (st + ed) / 2; - if (upright[mid][0] <= ch && ch <= upright[mid][1]) - return TRUE; - else - if (upright[mid][0] <= ch) - st = mid + 1; - else - ed = mid - 1; - } - - return FALSE; -} - -static void -width_iter_next (PangoWidthIter *iter) -{ - gboolean met_joiner = FALSE; - iter->start = iter->end; - - if (iter->end < iter->text_end) - { - gunichar ch = g_utf8_get_char (iter->end); - iter->upright = width_iter_is_upright (ch); - } - - while (iter->end < iter->text_end) - { - gunichar ch = g_utf8_get_char (iter->end); - - /* for zero width joiner */ - if (ch == 0x200D) - { - iter->end = g_utf8_next_char (iter->end); - met_joiner = TRUE; - continue; - } - - /* ignore the upright check if met joiner */ - if (met_joiner) - { - iter->end = g_utf8_next_char (iter->end); - met_joiner = FALSE; - continue; - } - - /* for variation selector, tag and emoji modifier. */ - if (G_UNLIKELY (ch == 0xFE0EU || ch == 0xFE0FU || - (ch >= 0xE0020 && ch <= 0xE007F) || - (ch >= 0x1F3FB && ch <= 0x1F3FF))) - { - iter->end = g_utf8_next_char (iter->end); - continue; - } - - if (width_iter_is_upright (ch) != iter->upright) - break; - - iter->end = g_utf8_next_char (iter->end); - } -} - -static void -width_iter_init (PangoWidthIter *iter, - const char *text, - int length) -{ - iter->text_start = text; - iter->text_end = text + length; - iter->start = iter->end = text; - - width_iter_next (iter); -} - -static void -width_iter_fini (PangoWidthIter* iter) -{ -} - -static void -itemize_state_init (ItemizeState *state, - PangoContext *context, - const char *text, - PangoDirection base_dir, - int start_index, - int length, - PangoAttrList *attrs, - PangoAttrIterator *cached_iter, - const PangoFontDescription *desc) -{ - state->context = context; - state->text = text; - state->end = text + start_index + length; - - state->result = NULL; - state->item = NULL; - - state->run_start = text + start_index; - state->changed = EMBEDDING_CHANGED | SCRIPT_CHANGED | LANG_CHANGED | - FONT_CHANGED | WIDTH_CHANGED | EMOJI_CHANGED; - - /* First, apply the bidirectional algorithm to break - * the text into directional runs. - */ - state->embedding_levels = pango_log2vis_get_embedding_levels (text + start_index, length, &base_dir); - - state->embedding_end_offset = 0; - state->embedding_end = text + start_index; - update_embedding_end (state); - - state->gravity = PANGO_GRAVITY_AUTO; - state->centered_baseline = PANGO_GRAVITY_IS_VERTICAL (state->context->resolved_gravity); - state->gravity_hint = state->context->gravity_hint; - state->resolved_gravity = PANGO_GRAVITY_AUTO; - - /* Initialize the attribute iterator - */ - if (cached_iter) - { - state->attr_iter = cached_iter; - state->free_attr_iter = FALSE; - } - else if (attrs) - { - state->attr_iter = pango_attr_list_get_iterator (attrs); - state->free_attr_iter = TRUE; - } - else - { - state->attr_iter = NULL; - state->free_attr_iter = FALSE; - } - - state->emoji_font_desc = NULL; - if (state->attr_iter) - { - state->font_desc = NULL; - state->lang = NULL; - - advance_attr_iterator_to (state->attr_iter, start_index); - update_attr_iterator (state); - } - else - { - state->font_desc = pango_font_description_copy_static (desc ? desc : state->context->font_desc); - state->lang = state->context->language; - state->extra_attrs = NULL; - state->copy_extra_attrs = FALSE; - - state->attr_end = state->end; - state->enable_fallback = TRUE; - } - - /* Initialize the script iterator - */ - _pango_script_iter_init (&state->script_iter, text + start_index, length); - pango_script_iter_get_range (&state->script_iter, NULL, - &state->script_end, &state->script); - - width_iter_init (&state->width_iter, text + start_index, length); - _pango_emoji_iter_init (&state->emoji_iter, text + start_index, length); - - if (!PANGO_GRAVITY_IS_VERTICAL (state->context->resolved_gravity)) - state->width_iter.end = state->end; - else - if (state->emoji_iter.is_emoji) - state->width_iter.end = MAX (state->width_iter.end, state->emoji_iter.end); - - update_end (state); - - if (pango_font_description_get_set_fields (state->font_desc) & PANGO_FONT_MASK_GRAVITY) - state->font_desc_gravity = pango_font_description_get_gravity (state->font_desc); - else - state->font_desc_gravity = PANGO_GRAVITY_AUTO; - - state->derived_lang = NULL; - state->current_fonts = NULL; - state->cache = NULL; - state->base_font = NULL; - state->first_space = NULL; - state->font_position = 0xffff; -} - -static gboolean -itemize_state_next (ItemizeState *state) -{ - if (state->run_end == state->end) - return FALSE; - - state->changed = 0; - - state->run_start = state->run_end; - - if (state->run_end == state->embedding_end) - { - update_embedding_end (state); - } - - if (state->run_end == state->attr_end) - { - pango_attr_iterator_next (state->attr_iter); - update_attr_iterator (state); - } - - if (state->run_end == state->script_end) - { - pango_script_iter_next (&state->script_iter); - pango_script_iter_get_range (&state->script_iter, NULL, - &state->script_end, &state->script); - state->changed |= SCRIPT_CHANGED; - } - if (state->run_end == state->emoji_iter.end) - { - _pango_emoji_iter_next (&state->emoji_iter); - state->changed |= EMOJI_CHANGED; - - if (state->emoji_iter.is_emoji) - state->width_iter.end = MAX (state->width_iter.end, state->emoji_iter.end); - } - if (state->run_end == state->width_iter.end) - { - width_iter_next (&state->width_iter); - state->changed |= WIDTH_CHANGED; - } - - update_end (state); - - return TRUE; -} - -static GSList * -copy_attr_slist (GSList *attr_slist) -{ - GSList *new_list = NULL; - GSList *l; - - for (l = attr_slist; l; l = l->next) - new_list = g_slist_prepend (new_list, pango_attribute_copy (l->data)); - - return g_slist_reverse (new_list); -} - -static void -itemize_state_fill_font (ItemizeState *state, - PangoFont *font) -{ - GList *l; - - for (l = state->result; l; l = l->next) - { - PangoItem *item = l->data; - if (item->analysis.font) - break; - if (font) - item->analysis.font = g_object_ref (font); - } -} - -static void -itemize_state_add_character (ItemizeState *state, - PangoFont *font, - int font_position, - gboolean force_break, - const char *pos, - gboolean is_space) -{ - const char *first_space = state->first_space; - int n_spaces = 0; - - if (is_space) - { - if (state->first_space == NULL) - state->first_space = pos; - } - else - state->first_space = NULL; - - if (state->item) - { - if (!state->item->analysis.font && font) - { - itemize_state_fill_font (state, font); - state->font_position = font_position; - } - else if (state->item->analysis.font && !font) - { - font = state->item->analysis.font; - font_position = state->font_position; - } - - if (!force_break && - state->item->analysis.font == font) - { - state->item->num_chars++; - return; - } - - /* Font is changing, we are about to end the current item. - * If it ended in a sequence of spaces (but wasn't only spaces), - * check if we should move those spaces to the new item (since - * the font is less "fallback". - * - * See https://gitlab.gnome.org/GNOME/pango/-/issues/249 - */ - if (state->text + state->item->offset < first_space && - font_position < state->font_position) - { - n_spaces = g_utf8_strlen (first_space, pos - first_space); - state->item->num_chars -= n_spaces; - pos = first_space; - } - - state->item->length = (pos - state->text) - state->item->offset; - } - - state->item = pango_item_new (); - state->item->offset = pos - state->text; - state->item->length = 0; - state->item->num_chars = n_spaces + 1; - - if (font) - g_object_ref (font); - state->item->analysis.font = font; - state->font_position = font_position; - - state->item->analysis.level = state->embedding; - state->item->analysis.gravity = state->resolved_gravity; - - /* The level vs. gravity dance: - * - If gravity is SOUTH, leave level untouched. - * - If gravity is NORTH, step level one up, to - * not get mirrored upside-down text. - * - If gravity is EAST, step up to an even level, as - * it's a clockwise-rotated layout, so the rotated - * top is unrotated left. - * - If gravity is WEST, step up to an odd level, as - * it's a counter-clockwise-rotated layout, so the rotated - * top is unrotated right. - * - * A similar dance is performed in pango-layout.c: - * line_set_resolved_dir(). Keep in synch. - */ - switch (state->item->analysis.gravity) - { - case PANGO_GRAVITY_SOUTH: - default: - break; - case PANGO_GRAVITY_NORTH: - state->item->analysis.level++; - break; - case PANGO_GRAVITY_EAST: - state->item->analysis.level += 1; - state->item->analysis.level &= ~1; - break; - case PANGO_GRAVITY_WEST: - state->item->analysis.level |= 1; - break; - } - - state->item->analysis.flags = state->centered_baseline ? PANGO_ANALYSIS_FLAG_CENTERED_BASELINE : 0; - - state->item->analysis.script = state->script; - state->item->analysis.language = state->derived_lang; - - if (state->copy_extra_attrs) - { - state->item->analysis.extra_attrs = copy_attr_slist (state->extra_attrs); - } - else - { - state->item->analysis.extra_attrs = state->extra_attrs; - state->copy_extra_attrs = TRUE; - } - - state->result = g_list_prepend (state->result, state->item); -} - -typedef struct { - PangoLanguage *lang; - gunichar wc; - PangoFont *font; - int position; -} GetFontInfo; - -static gboolean -get_font_foreach (PangoFontset *fontset, - PangoFont *font, - gpointer data) -{ - GetFontInfo *info = data; - - if (G_UNLIKELY (!font)) - return FALSE; - - if (pango_font_has_char (font, info->wc)) - { - info->font = font; - return TRUE; - } - - if (!fontset) - { - info->font = font; - return TRUE; - } - - info->position++; - - return FALSE; -} - -static PangoFont * -get_base_font (ItemizeState *state) -{ - if (!state->base_font) - state->base_font = pango_font_map_load_font (state->context->font_map, - state->context, - state->font_desc); - return state->base_font; -} - -static gboolean -get_font (ItemizeState *state, - gunichar wc, - PangoFont **font, - int *position) -{ - GetFontInfo info; - - /* We'd need a separate cache when fallback is disabled, but since lookup - * with fallback disabled is faster anyways, we just skip caching */ - if (state->enable_fallback && font_cache_get (state->cache, wc, font, position)) - return TRUE; - - info.lang = state->derived_lang; - info.wc = wc; - info.font = NULL; - info.position = 0; - - if (state->enable_fallback) - pango_fontset_foreach (state->current_fonts, get_font_foreach, &info); - else - get_font_foreach (NULL, get_base_font (state), &info); - - *font = info.font; - *position = info.position; - - /* skip caching if fallback disabled (see above) */ - if (state->enable_fallback) - font_cache_insert (state->cache, wc, *font, *position); - - return TRUE; -} - -static PangoLanguage * -compute_derived_language (PangoLanguage *lang, - PangoScript script) -{ - PangoLanguage *derived_lang; - - /* Make sure the language tag is consistent with the derived - * script. There is no point in marking up a section of - * Arabic text with the "en" language tag. - */ - if (lang && pango_language_includes_script (lang, script)) - derived_lang = lang; - else - { - derived_lang = pango_script_get_sample_language (script); - /* If we don't find a sample language for the script, we - * use a language tag that shouldn't actually be used - * anywhere. This keeps fontconfig (for the PangoFc* - * backend) from using the language tag to affect the - * sort order. I don't have a reference for 'xx' being - * safe here, though Keith Packard claims it is. - */ - if (!derived_lang) - derived_lang = pango_language_from_string ("xx"); - } - - return derived_lang; -} - -static void -itemize_state_update_for_new_run (ItemizeState *state) -{ - /* This block should be moved to update_attr_iterator, but I'm too lazy to - * do it right now */ - if (state->changed & (FONT_CHANGED | SCRIPT_CHANGED | WIDTH_CHANGED)) - { - /* Font-desc gravity overrides everything */ - if (state->font_desc_gravity != PANGO_GRAVITY_AUTO) - { - state->resolved_gravity = state->font_desc_gravity; - } - else - { - PangoGravity gravity = state->gravity; - PangoGravityHint gravity_hint = state->gravity_hint; - - if (G_LIKELY (gravity == PANGO_GRAVITY_AUTO)) - gravity = state->context->resolved_gravity; - - state->resolved_gravity = pango_gravity_get_for_script_and_width (state->script, - state->width_iter.upright, - gravity, - gravity_hint); - } - - if (state->font_desc_gravity != state->resolved_gravity) - { - pango_font_description_set_gravity (state->font_desc, state->resolved_gravity); - state->changed |= FONT_CHANGED; - } - } - - if (state->changed & (SCRIPT_CHANGED | LANG_CHANGED)) - { - PangoLanguage *old_derived_lang = state->derived_lang; - state->derived_lang = compute_derived_language (state->lang, state->script); - if (old_derived_lang != state->derived_lang) - state->changed |= DERIVED_LANG_CHANGED; - } - - if (state->changed & (EMOJI_CHANGED)) - { - state->changed |= FONT_CHANGED; - } - - if (state->changed & (FONT_CHANGED | DERIVED_LANG_CHANGED) && - state->current_fonts) - { - g_object_unref (state->current_fonts); - state->current_fonts = NULL; - state->cache = NULL; - } - - if (!state->current_fonts) - { - gboolean is_emoji = state->emoji_iter.is_emoji; - if (is_emoji && !state->emoji_font_desc) - { - state->emoji_font_desc = pango_font_description_copy_static (state->font_desc); - pango_font_description_set_family_static (state->emoji_font_desc, "emoji"); - } - state->current_fonts = pango_font_map_load_fontset (state->context->font_map, - state->context, - is_emoji ? state->emoji_font_desc : state->font_desc, - state->derived_lang); - state->cache = get_font_cache (state->current_fonts); - } - - if ((state->changed & FONT_CHANGED) && state->base_font) - { - g_object_unref (state->base_font); - state->base_font = NULL; - } -} - -static void -itemize_state_process_run (ItemizeState *state) -{ - const char *p; - gboolean last_was_forced_break = FALSE; - gboolean is_space; - - /* Only one character has type G_UNICODE_LINE_SEPARATOR in Unicode 4.0; - * update this if that changes. */ -#define LINE_SEPARATOR 0x2028 - - itemize_state_update_for_new_run (state); - - /* We should never get an empty run */ - g_assert (state->run_end != state->run_start); - - for (p = state->run_start; - p < state->run_end; - p = g_utf8_next_char (p)) - { - gunichar wc = g_utf8_get_char (p); - gboolean is_forced_break = (wc == '\t' || wc == LINE_SEPARATOR); - PangoFont *font; - int font_position; - GUnicodeType type; - - /* We don't want space characters to affect font selection; in general, - * it's always wrong to select a font just to render a space. - * We assume that all fonts have the ASCII space, and for other space - * characters if they don't, HarfBuzz will compatibility-decompose them - * to ASCII space... - * See bugs #355987 and #701652. - * - * We don't want to change fonts just for variation selectors. - * See bug #781123. - * - * Finally, don't change fonts for line or paragraph separators. - * - * Note that we want spaces to use the 'better' font, comparing - * the font that is used before and after the space. This is handled - * in itemize_state_add_character(). - */ - type = g_unichar_type (wc); - if (G_UNLIKELY (type == G_UNICODE_CONTROL || - type == G_UNICODE_FORMAT || - type == G_UNICODE_SURROGATE || - type == G_UNICODE_LINE_SEPARATOR || - type == G_UNICODE_PARAGRAPH_SEPARATOR || - (type == G_UNICODE_SPACE_SEPARATOR && wc != 0x1680u /* OGHAM SPACE MARK */) || - (wc >= 0xfe00u && wc <= 0xfe0fu) || - (wc >= 0xe0100u && wc <= 0xe01efu))) - { - font = NULL; - font_position = 0xffff; - is_space = TRUE; - } - else - { - get_font (state, wc, &font, &font_position); - is_space = FALSE; - } - - itemize_state_add_character (state, font, font_position, - is_forced_break || last_was_forced_break, - p, - is_space); - - last_was_forced_break = is_forced_break; - } - - /* Finish the final item from the current segment */ - state->item->length = (p - state->text) - state->item->offset; - if (!state->item->analysis.font) - { - PangoFont *font; - int position; - - if (G_UNLIKELY (!get_font (state, ' ', &font, &position))) - { - /* If no font was found, warn once per fontmap/script pair */ - PangoFontMap *fontmap = state->context->font_map; - char *script_tag = g_strdup_printf ("g-unicode-script-%d", state->script); - - if (!g_object_get_data (G_OBJECT (fontmap), script_tag)) - { - g_warning ("failed to choose a font, expect ugly output. script='%d'", - state->script); - - g_object_set_data_full (G_OBJECT (fontmap), script_tag, - GINT_TO_POINTER (1), NULL); - } - - g_free (script_tag); - - font = NULL; - } - itemize_state_fill_font (state, font); - } - state->item = NULL; -} - -static void -itemize_state_finish (ItemizeState *state) -{ - g_free (state->embedding_levels); - if (state->free_attr_iter) - pango_attr_iterator_destroy (state->attr_iter); - _pango_script_iter_fini (&state->script_iter); - pango_font_description_free (state->font_desc); - pango_font_description_free (state->emoji_font_desc); - width_iter_fini (&state->width_iter); - _pango_emoji_iter_fini (&state->emoji_iter); - - if (state->current_fonts) - g_object_unref (state->current_fonts); - if (state->base_font) - g_object_unref (state->base_font); -} - -/** - * pango_itemize_with_base_dir: - * @context: a structure holding information that affects - * the itemization process. - * @base_dir: base direction to use for bidirectional processing - * @text: the text to itemize. - * @start_index: first byte in @text to process - * @length: the number of bytes (not characters) to process - * after @start_index. This must be >= 0. - * @attrs: the set of attributes that apply to @text. - * @cached_iter: (nullable): Cached attribute iterator - * - * Like `pango_itemize()`, but with an explicitly specified base direction. - * - * The base direction is used when computing bidirectional levels. - * (see [method@Pango.Context.set_base_dir]). [func@itemize] gets the - * base direction from the `PangoContext`. - * - * Return value: (transfer full) (element-type Pango.Item): a `GList` of - * [struct@Pango.Item] structures. The items should be freed using - * [method@Pango.Item.free] probably in combination with g_list_free_full(). - * - * Since: 1.4 - */ -GList * -pango_itemize_with_base_dir (PangoContext *context, - PangoDirection base_dir, - const char *text, - int start_index, - int length, - PangoAttrList *attrs, - PangoAttrIterator *cached_iter) -{ - ItemizeState state; - - g_return_val_if_fail (context != NULL, NULL); - g_return_val_if_fail (start_index >= 0, NULL); - g_return_val_if_fail (length >= 0, NULL); - g_return_val_if_fail (length == 0 || text != NULL, NULL); - - if (length == 0 || g_utf8_get_char (text + start_index) == '\0') - return NULL; - - itemize_state_init (&state, context, text, base_dir, start_index, length, - attrs, cached_iter, NULL); - - do - itemize_state_process_run (&state); - while (itemize_state_next (&state)); - - itemize_state_finish (&state); - - return g_list_reverse (state.result); -} - -static GList * -itemize_with_font (PangoContext *context, - const char *text, - int start_index, - int length, - const PangoFontDescription *desc) -{ - ItemizeState state; - - if (length == 0) - return NULL; - - itemize_state_init (&state, context, text, context->base_dir, start_index, length, - NULL, NULL, desc); - - do - itemize_state_process_run (&state); - while (itemize_state_next (&state)); - - itemize_state_finish (&state); - - return g_list_reverse (state.result); -} - -/** - * pango_itemize: - * @context: a structure holding information that affects - * the itemization process. - * @text: the text to itemize. Must be valid UTF-8 - * @start_index: first byte in @text to process - * @length: the number of bytes (not characters) to process - * after @start_index. This must be >= 0. - * @attrs: the set of attributes that apply to @text. - * @cached_iter: (nullable): Cached attribute iterator - * - * Breaks a piece of text into segments with consistent directional - * level and font. - * - * Each byte of @text will be contained in exactly one of the items in the - * returned list; the generated list of items will be in logical order (the - * start offsets of the items are ascending). - * - * @cached_iter should be an iterator over @attrs currently positioned - * at a range before or containing @start_index; @cached_iter will be - * advanced to the range covering the position just after - * @start_index + @length. (i.e. if itemizing in a loop, just keep passing - * in the same @cached_iter). - * - * Return value: (transfer full) (element-type Pango.Item): a `GList` of - * [struct@Pango.Item] structures. The items should be freed using - * [method@Pango.Item.free] probably in combination with g_list_free_full(). - */ -GList * -pango_itemize (PangoContext *context, - const char *text, - int start_index, - int length, - PangoAttrList *attrs, - PangoAttrIterator *cached_iter) -{ - g_return_val_if_fail (context != NULL, NULL); - g_return_val_if_fail (start_index >= 0, NULL); - g_return_val_if_fail (length >= 0, NULL); - g_return_val_if_fail (length == 0 || text != NULL, NULL); - - return pango_itemize_with_base_dir (context, context->base_dir, - text, start_index, length, attrs, cached_iter); -} static gboolean get_first_metrics_foreach (PangoFontset *fontset, @@ -1861,7 +712,7 @@ pango_context_get_metrics (PangoContext *context, sample_str = pango_language_get_sample_string (language); text_len = strlen (sample_str); - items = itemize_with_font (context, sample_str, 0, text_len, desc); + items = pango_itemize_with_font (context, sample_str, 0, text_len, desc); update_metrics_from_items (metrics, language, sample_str, text_len, items); |