diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.37/src/hb-buffer.cc')
| -rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-0.9.37/src/hb-buffer.cc | 1572 |
1 files changed, 1572 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.37/src/hb-buffer.cc b/Build/source/libs/harfbuzz/harfbuzz-0.9.37/src/hb-buffer.cc new file mode 100644 index 00000000000..74ae273eeca --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-0.9.37/src/hb-buffer.cc @@ -0,0 +1,1572 @@ +/* + * Copyright © 1998-2004 David Turner and Werner Lemberg + * Copyright © 2004,2007,2009,2010 Red Hat, Inc. + * Copyright © 2011,2012 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): Owen Taylor, Behdad Esfahbod + * Google Author(s): Behdad Esfahbod + */ + +#include "hb-buffer-private.hh" +#include "hb-utf-private.hh" + + +#ifndef HB_DEBUG_BUFFER +#define HB_DEBUG_BUFFER (HB_DEBUG+0) +#endif + + +hb_bool_t +hb_segment_properties_equal (const hb_segment_properties_t *a, + const hb_segment_properties_t *b) +{ + return a->direction == b->direction && + a->script == b->script && + a->language == b->language && + a->reserved1 == b->reserved1 && + a->reserved2 == b->reserved2; + +} + +unsigned int +hb_segment_properties_hash (const hb_segment_properties_t *p) +{ + return (unsigned int) p->direction ^ + (unsigned int) p->script ^ + (intptr_t) (p->language); +} + + + +/* Here is how the buffer works internally: + * + * There are two info pointers: info and out_info. They always have + * the same allocated size, but different lengths. + * + * As an optimization, both info and out_info may point to the + * same piece of memory, which is owned by info. This remains the + * case as long as out_len doesn't exceed i at any time. + * In that case, swap_buffers() is no-op and the glyph operations operate + * mostly in-place. + * + * As soon as out_info gets longer than info, out_info is moved over + * to an alternate buffer (which we reuse the pos buffer for!), and its + * current contents (out_len entries) are copied to the new place. + * This should all remain transparent to the user. swap_buffers() then + * switches info and out_info. + */ + + + +/* Internal API */ + +bool +hb_buffer_t::enlarge (unsigned int size) +{ + if (unlikely (in_error)) + return false; + + unsigned int new_allocated = allocated; + hb_glyph_position_t *new_pos = NULL; + hb_glyph_info_t *new_info = NULL; + bool separate_out = out_info != info; + + if (unlikely (_hb_unsigned_int_mul_overflows (size, sizeof (info[0])))) + goto done; + + while (size >= new_allocated) + new_allocated += (new_allocated >> 1) + 32; + + ASSERT_STATIC (sizeof (info[0]) == sizeof (pos[0])); + if (unlikely (_hb_unsigned_int_mul_overflows (new_allocated, sizeof (info[0])))) + goto done; + + new_pos = (hb_glyph_position_t *) realloc (pos, new_allocated * sizeof (pos[0])); + new_info = (hb_glyph_info_t *) realloc (info, new_allocated * sizeof (info[0])); + +done: + if (unlikely (!new_pos || !new_info)) + in_error = true; + + if (likely (new_pos)) + pos = new_pos; + + if (likely (new_info)) + info = new_info; + + out_info = separate_out ? (hb_glyph_info_t *) pos : info; + if (likely (!in_error)) + allocated = new_allocated; + + return likely (!in_error); +} + +bool +hb_buffer_t::make_room_for (unsigned int num_in, + unsigned int num_out) +{ + if (unlikely (!ensure (out_len + num_out))) return false; + + if (out_info == info && + out_len + num_out > idx + num_in) + { + assert (have_output); + + out_info = (hb_glyph_info_t *) pos; + memcpy (out_info, info, out_len * sizeof (out_info[0])); + } + + return true; +} + +bool +hb_buffer_t::shift_forward (unsigned int count) +{ + assert (have_output); + if (unlikely (!ensure (len + count))) return false; + + memmove (info + idx + count, info + idx, (len - idx) * sizeof (info[0])); + len += count; + idx += count; + + return true; +} + +hb_buffer_t::scratch_buffer_t * +hb_buffer_t::get_scratch_buffer (unsigned int *size) +{ + have_output = false; + have_positions = false; + + out_len = 0; + out_info = info; + + assert ((uintptr_t) pos % sizeof (scratch_buffer_t) == 0); + *size = allocated * sizeof (pos[0]) / sizeof (scratch_buffer_t); + return (scratch_buffer_t *) (void *) pos; +} + + + +/* HarfBuzz-Internal API */ + +void +hb_buffer_t::reset (void) +{ + if (unlikely (hb_object_is_inert (this))) + return; + + hb_unicode_funcs_destroy (unicode); + unicode = hb_unicode_funcs_get_default (); + flags = HB_BUFFER_FLAG_DEFAULT; + replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT; + + clear (); +} + +void +hb_buffer_t::clear (void) +{ + if (unlikely (hb_object_is_inert (this))) + return; + + hb_segment_properties_t default_props = HB_SEGMENT_PROPERTIES_DEFAULT; + props = default_props; + + content_type = HB_BUFFER_CONTENT_TYPE_INVALID; + in_error = false; + have_output = false; + have_positions = false; + + idx = 0; + len = 0; + out_len = 0; + out_info = info; + + serial = 0; + memset (allocated_var_bytes, 0, sizeof allocated_var_bytes); + memset (allocated_var_owner, 0, sizeof allocated_var_owner); + + memset (context, 0, sizeof context); + memset (context_len, 0, sizeof context_len); +} + +void +hb_buffer_t::add (hb_codepoint_t codepoint, + unsigned int cluster) +{ + hb_glyph_info_t *glyph; + + if (unlikely (!ensure (len + 1))) return; + + glyph = &info[len]; + + memset (glyph, 0, sizeof (*glyph)); + glyph->codepoint = codepoint; + glyph->mask = 1; + glyph->cluster = cluster; + + len++; +} + +void +hb_buffer_t::add_info (const hb_glyph_info_t &glyph_info) +{ + if (unlikely (!ensure (len + 1))) return; + + info[len] = glyph_info; + + len++; +} + + +void +hb_buffer_t::remove_output (void) +{ + if (unlikely (hb_object_is_inert (this))) + return; + + have_output = false; + have_positions = false; + + out_len = 0; + out_info = info; +} + +void +hb_buffer_t::clear_output (void) +{ + if (unlikely (hb_object_is_inert (this))) + return; + + have_output = true; + have_positions = false; + + out_len = 0; + out_info = info; +} + +void +hb_buffer_t::clear_positions (void) +{ + if (unlikely (hb_object_is_inert (this))) + return; + + have_output = false; + have_positions = true; + + out_len = 0; + out_info = info; + + memset (pos, 0, sizeof (pos[0]) * len); +} + +void +hb_buffer_t::swap_buffers (void) +{ + if (unlikely (in_error)) return; + + assert (have_output); + have_output = false; + + if (out_info != info) + { + hb_glyph_info_t *tmp_string; + tmp_string = info; + info = out_info; + out_info = tmp_string; + pos = (hb_glyph_position_t *) out_info; + } + + unsigned int tmp; + tmp = len; + len = out_len; + out_len = tmp; + + idx = 0; +} + + +void +hb_buffer_t::replace_glyphs (unsigned int num_in, + unsigned int num_out, + const uint32_t *glyph_data) +{ + if (unlikely (!make_room_for (num_in, num_out))) return; + + merge_clusters (idx, idx + num_in); + + hb_glyph_info_t orig_info = info[idx]; + hb_glyph_info_t *pinfo = &out_info[out_len]; + for (unsigned int i = 0; i < num_out; i++) + { + *pinfo = orig_info; + pinfo->codepoint = glyph_data[i]; + pinfo++; + } + + idx += num_in; + out_len += num_out; +} + +void +hb_buffer_t::output_glyph (hb_codepoint_t glyph_index) +{ + if (unlikely (!make_room_for (0, 1))) return; + + out_info[out_len] = info[idx]; + out_info[out_len].codepoint = glyph_index; + + out_len++; +} + +void +hb_buffer_t::output_info (const hb_glyph_info_t &glyph_info) +{ + if (unlikely (!make_room_for (0, 1))) return; + + out_info[out_len] = glyph_info; + + out_len++; +} + +void +hb_buffer_t::copy_glyph (void) +{ + if (unlikely (!make_room_for (0, 1))) return; + + out_info[out_len] = info[idx]; + + out_len++; +} + +bool +hb_buffer_t::move_to (unsigned int i) +{ + if (!have_output) + { + assert (i <= len); + idx = i; + return true; + } + + assert (i <= out_len + (len - idx)); + + if (out_len < i) + { + unsigned int count = i - out_len; + if (unlikely (!make_room_for (count, count))) return false; + + memmove (out_info + out_len, info + idx, count * sizeof (out_info[0])); + idx += count; + out_len += count; + } + else if (out_len > i) + { + /* Tricky part: rewinding... */ + unsigned int count = out_len - i; + + if (unlikely (idx < count && !shift_forward (count + 32))) return false; + + assert (idx >= count); + + idx -= count; + out_len -= count; + memmove (info + idx, out_info + out_len, count * sizeof (out_info[0])); + } + + return true; +} + +void +hb_buffer_t::replace_glyph (hb_codepoint_t glyph_index) +{ + if (unlikely (out_info != info || out_len != idx)) { + if (unlikely (!make_room_for (1, 1))) return; + out_info[out_len] = info[idx]; + } + out_info[out_len].codepoint = glyph_index; + + idx++; + out_len++; +} + + +void +hb_buffer_t::set_masks (hb_mask_t value, + hb_mask_t mask, + unsigned int cluster_start, + unsigned int cluster_end) +{ + hb_mask_t not_mask = ~mask; + value &= mask; + + if (!mask) + return; + + if (cluster_start == 0 && cluster_end == (unsigned int)-1) { + unsigned int count = len; + for (unsigned int i = 0; i < count; i++) + info[i].mask = (info[i].mask & not_mask) | value; + return; + } + + unsigned int count = len; + for (unsigned int i = 0; i < count; i++) + if (cluster_start <= info[i].cluster && info[i].cluster < cluster_end) + info[i].mask = (info[i].mask & not_mask) | value; +} + +void +hb_buffer_t::reverse_range (unsigned int start, + unsigned int end) +{ + unsigned int i, j; + + if (start == end - 1) + return; + + for (i = start, j = end - 1; i < j; i++, j--) { + hb_glyph_info_t t; + + t = info[i]; + info[i] = info[j]; + info[j] = t; + } + + if (pos) { + for (i = start, j = end - 1; i < j; i++, j--) { + hb_glyph_position_t t; + + t = pos[i]; + pos[i] = pos[j]; + pos[j] = t; + } + } +} + +void +hb_buffer_t::reverse (void) +{ + if (unlikely (!len)) + return; + + reverse_range (0, len); +} + +void +hb_buffer_t::reverse_clusters (void) +{ + unsigned int i, start, count, last_cluster; + + if (unlikely (!len)) + return; + + reverse (); + + count = len; + start = 0; + last_cluster = info[0].cluster; + for (i = 1; i < count; i++) { + if (last_cluster != info[i].cluster) { + reverse_range (start, i); + start = i; + last_cluster = info[i].cluster; + } + } + reverse_range (start, i); +} + +void +hb_buffer_t::merge_clusters (unsigned int start, + unsigned int end) +{ +#ifdef HB_NO_MERGE_CLUSTERS + return; +#endif + + if (unlikely (end - start < 2)) + return; + + unsigned int cluster = info[start].cluster; + + for (unsigned int i = start + 1; i < end; i++) + cluster = MIN (cluster, info[i].cluster); + + /* Extend end */ + while (end < len && info[end - 1].cluster == info[end].cluster) + end++; + + /* Extend start */ + while (idx < start && info[start - 1].cluster == info[start].cluster) + start--; + + /* If we hit the start of buffer, continue in out-buffer. */ + if (idx == start) + for (unsigned i = out_len; i && out_info[i - 1].cluster == info[start].cluster; i--) + out_info[i - 1].cluster = cluster; + + for (unsigned int i = start; i < end; i++) + info[i].cluster = cluster; +} +void +hb_buffer_t::merge_out_clusters (unsigned int start, + unsigned int end) +{ +#ifdef HB_NO_MERGE_CLUSTERS + return; +#endif + + if (unlikely (end - start < 2)) + return; + + unsigned int cluster = out_info[start].cluster; + + for (unsigned int i = start + 1; i < end; i++) + cluster = MIN (cluster, out_info[i].cluster); + + /* Extend start */ + while (start && out_info[start - 1].cluster == out_info[start].cluster) + start--; + + /* Extend end */ + while (end < out_len && out_info[end - 1].cluster == out_info[end].cluster) + end++; + + /* If we hit the end of out-buffer, continue in buffer. */ + if (end == out_len) + for (unsigned i = idx; i < len && info[i].cluster == out_info[end - 1].cluster; i++) + info[i].cluster = cluster; + + for (unsigned int i = start; i < end; i++) + out_info[i].cluster = cluster; +} + +void +hb_buffer_t::guess_segment_properties (void) +{ + assert (content_type == HB_BUFFER_CONTENT_TYPE_UNICODE || + (!len && content_type == HB_BUFFER_CONTENT_TYPE_INVALID)); + + /* If script is set to INVALID, guess from buffer contents */ + if (props.script == HB_SCRIPT_INVALID) { + for (unsigned int i = 0; i < len; i++) { + hb_script_t script = unicode->script (info[i].codepoint); + if (likely (script != HB_SCRIPT_COMMON && + script != HB_SCRIPT_INHERITED && + script != HB_SCRIPT_UNKNOWN)) { + props.script = script; + break; + } + } + } + + /* If direction is set to INVALID, guess from script */ + if (props.direction == HB_DIRECTION_INVALID) { + props.direction = hb_script_get_horizontal_direction (props.script); + } + + /* If language is not set, use default language from locale */ + if (props.language == HB_LANGUAGE_INVALID) { + /* TODO get_default_for_script? using $LANGUAGE */ + props.language = hb_language_get_default (); + } +} + + +static inline void +dump_var_allocation (const hb_buffer_t *buffer) +{ + char buf[80]; + for (unsigned int i = 0; i < 8; i++) + buf[i] = '0' + buffer->allocated_var_bytes[7 - i]; + buf[8] = '\0'; + DEBUG_MSG (BUFFER, buffer, + "Current var allocation: %s", + buf); +} + +void hb_buffer_t::allocate_var (unsigned int byte_i, unsigned int count, const char *owner) +{ + assert (byte_i < 8 && byte_i + count <= 8); + + if (DEBUG_ENABLED (BUFFER)) + dump_var_allocation (this); + DEBUG_MSG (BUFFER, this, + "Allocating var bytes %d..%d for %s", + byte_i, byte_i + count - 1, owner); + + for (unsigned int i = byte_i; i < byte_i + count; i++) { + assert (!allocated_var_bytes[i]); + allocated_var_bytes[i]++; + allocated_var_owner[i] = owner; + } +} + +void hb_buffer_t::deallocate_var (unsigned int byte_i, unsigned int count, const char *owner) +{ + if (DEBUG_ENABLED (BUFFER)) + dump_var_allocation (this); + + DEBUG_MSG (BUFFER, this, + "Deallocating var bytes %d..%d for %s", + byte_i, byte_i + count - 1, owner); + + assert (byte_i < 8 && byte_i + count <= 8); + for (unsigned int i = byte_i; i < byte_i + count; i++) { + assert (allocated_var_bytes[i]); + assert (0 == strcmp (allocated_var_owner[i], owner)); + allocated_var_bytes[i]--; + } +} + +void hb_buffer_t::assert_var (unsigned int byte_i, unsigned int count, const char *owner) +{ + if (DEBUG_ENABLED (BUFFER)) + dump_var_allocation (this); + + DEBUG_MSG (BUFFER, this, + "Asserting var bytes %d..%d for %s", + byte_i, byte_i + count - 1, owner); + + assert (byte_i < 8 && byte_i + count <= 8); + for (unsigned int i = byte_i; i < byte_i + count; i++) { + assert (allocated_var_bytes[i]); + assert (0 == strcmp (allocated_var_owner[i], owner)); + } +} + +void hb_buffer_t::deallocate_var_all (void) +{ + memset (allocated_var_bytes, 0, sizeof (allocated_var_bytes)); + memset (allocated_var_owner, 0, sizeof (allocated_var_owner)); +} + +/* Public API */ + +/** + * hb_buffer_create: (Xconstructor) + * + * + * + * Return value: (transfer full) + * + * Since: 1.0 + **/ +hb_buffer_t * +hb_buffer_create (void) +{ + hb_buffer_t *buffer; + + if (!(buffer = hb_object_create<hb_buffer_t> ())) + return hb_buffer_get_empty (); + + buffer->reset (); + + return buffer; +} + +/** + * hb_buffer_get_empty: + * + * + * + * Return value: (transfer full): + * + * Since: 1.0 + **/ +hb_buffer_t * +hb_buffer_get_empty (void) +{ + static const hb_buffer_t _hb_buffer_nil = { + HB_OBJECT_HEADER_STATIC, + + const_cast<hb_unicode_funcs_t *> (&_hb_unicode_funcs_nil), + HB_BUFFER_FLAG_DEFAULT, + HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT, + + HB_BUFFER_CONTENT_TYPE_INVALID, + HB_SEGMENT_PROPERTIES_DEFAULT, + true, /* in_error */ + true, /* have_output */ + true /* have_positions */ + + /* Zero is good enough for everything else. */ + }; + + return const_cast<hb_buffer_t *> (&_hb_buffer_nil); +} + +/** + * hb_buffer_reference: (skip) + * @buffer: a buffer. + * + * + * + * Return value: (transfer full): + * + * Since: 1.0 + **/ +hb_buffer_t * +hb_buffer_reference (hb_buffer_t *buffer) +{ + return hb_object_reference (buffer); +} + +/** + * hb_buffer_destroy: (skip) + * @buffer: a buffer. + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_destroy (hb_buffer_t *buffer) +{ + if (!hb_object_destroy (buffer)) return; + + hb_unicode_funcs_destroy (buffer->unicode); + + free (buffer->info); + free (buffer->pos); + + free (buffer); +} + +/** + * hb_buffer_set_user_data: (skip) + * @buffer: a buffer. + * @key: + * @data: + * @destroy: + * @replace: + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_bool_t +hb_buffer_set_user_data (hb_buffer_t *buffer, + hb_user_data_key_t *key, + void * data, + hb_destroy_func_t destroy, + hb_bool_t replace) +{ + return hb_object_set_user_data (buffer, key, data, destroy, replace); +} + +/** + * hb_buffer_get_user_data: (skip) + * @buffer: a buffer. + * @key: + * + * + * + * Return value: + * + * Since: 1.0 + **/ +void * +hb_buffer_get_user_data (hb_buffer_t *buffer, + hb_user_data_key_t *key) +{ + return hb_object_get_user_data (buffer, key); +} + + +/** + * hb_buffer_set_content_type: + * @buffer: a buffer. + * @content_type: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_content_type (hb_buffer_t *buffer, + hb_buffer_content_type_t content_type) +{ + buffer->content_type = content_type; +} + +/** + * hb_buffer_get_content_type: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_buffer_content_type_t +hb_buffer_get_content_type (hb_buffer_t *buffer) +{ + return buffer->content_type; +} + + +/** + * hb_buffer_set_unicode_funcs: + * @buffer: a buffer. + * @unicode_funcs: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_unicode_funcs (hb_buffer_t *buffer, + hb_unicode_funcs_t *unicode_funcs) +{ + if (unlikely (hb_object_is_inert (buffer))) + return; + + if (!unicode_funcs) + unicode_funcs = hb_unicode_funcs_get_default (); + + + hb_unicode_funcs_reference (unicode_funcs); + hb_unicode_funcs_destroy (buffer->unicode); + buffer->unicode = unicode_funcs; +} + +/** + * hb_buffer_get_unicode_funcs: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_unicode_funcs_t * +hb_buffer_get_unicode_funcs (hb_buffer_t *buffer) +{ + return buffer->unicode; +} + +/** + * hb_buffer_set_direction: + * @buffer: a buffer. + * @direction: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_direction (hb_buffer_t *buffer, + hb_direction_t direction) + +{ + if (unlikely (hb_object_is_inert (buffer))) + return; + + buffer->props.direction = direction; +} + +/** + * hb_buffer_get_direction: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_direction_t +hb_buffer_get_direction (hb_buffer_t *buffer) +{ + return buffer->props.direction; +} + +/** + * hb_buffer_set_script: + * @buffer: a buffer. + * @script: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_script (hb_buffer_t *buffer, + hb_script_t script) +{ + if (unlikely (hb_object_is_inert (buffer))) + return; + + buffer->props.script = script; +} + +/** + * hb_buffer_get_script: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_script_t +hb_buffer_get_script (hb_buffer_t *buffer) +{ + return buffer->props.script; +} + +/** + * hb_buffer_set_language: + * @buffer: a buffer. + * @language: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_language (hb_buffer_t *buffer, + hb_language_t language) +{ + if (unlikely (hb_object_is_inert (buffer))) + return; + + buffer->props.language = language; +} + +/** + * hb_buffer_get_language: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_language_t +hb_buffer_get_language (hb_buffer_t *buffer) +{ + return buffer->props.language; +} + +/** + * hb_buffer_set_segment_properties: + * @buffer: a buffer. + * @props: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_segment_properties (hb_buffer_t *buffer, + const hb_segment_properties_t *props) +{ + if (unlikely (hb_object_is_inert (buffer))) + return; + + buffer->props = *props; +} + +/** + * hb_buffer_get_segment_properties: + * @buffer: a buffer. + * @props: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_get_segment_properties (hb_buffer_t *buffer, + hb_segment_properties_t *props) +{ + *props = buffer->props; +} + + +/** + * hb_buffer_set_flags: + * @buffer: a buffer. + * @flags: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_flags (hb_buffer_t *buffer, + hb_buffer_flags_t flags) +{ + if (unlikely (hb_object_is_inert (buffer))) + return; + + buffer->flags = flags; +} + +/** + * hb_buffer_get_flags: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_buffer_flags_t +hb_buffer_get_flags (hb_buffer_t *buffer) +{ + return buffer->flags; +} + + +/** + * hb_buffer_set_replacement_codepoint: + * @buffer: a buffer. + * @replacement: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_set_replacement_codepoint (hb_buffer_t *buffer, + hb_codepoint_t replacement) +{ + if (unlikely (hb_object_is_inert (buffer))) + return; + + buffer->replacement = replacement; +} + +/** + * hb_buffer_get_replacement_codepoint: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_codepoint_t +hb_buffer_get_replacement_codepoint (hb_buffer_t *buffer) +{ + return buffer->replacement; +} + + +/** + * hb_buffer_reset: + * @buffer: a buffer. + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_reset (hb_buffer_t *buffer) +{ + buffer->reset (); +} + +/** + * hb_buffer_clear_contents: + * @buffer: a buffer. + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_clear_contents (hb_buffer_t *buffer) +{ + buffer->clear (); +} + +/** + * hb_buffer_pre_allocate: + * @buffer: a buffer. + * @size: + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_bool_t +hb_buffer_pre_allocate (hb_buffer_t *buffer, unsigned int size) +{ + return buffer->ensure (size); +} + +/** + * hb_buffer_allocation_successful: + * @buffer: a buffer. + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_bool_t +hb_buffer_allocation_successful (hb_buffer_t *buffer) +{ + return !buffer->in_error; +} + +/** + * hb_buffer_add: + * @buffer: a buffer. + * @codepoint: + * @cluster: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_add (hb_buffer_t *buffer, + hb_codepoint_t codepoint, + unsigned int cluster) +{ + buffer->add (codepoint, cluster); + buffer->clear_context (1); +} + +/** + * hb_buffer_set_length: + * @buffer: a buffer. + * @length: + * + * + * + * Return value: + * + * Since: 1.0 + **/ +hb_bool_t +hb_buffer_set_length (hb_buffer_t *buffer, + unsigned int length) +{ + if (unlikely (hb_object_is_inert (buffer))) + return length == 0; + + if (!buffer->ensure (length)) + return false; + + /* Wipe the new space */ + if (length > buffer->len) { + memset (buffer->info + buffer->len, 0, sizeof (buffer->info[0]) * (length - buffer->len)); + if (buffer->have_positions) + memset (buffer->pos + buffer->len, 0, sizeof (buffer->pos[0]) * (length - buffer->len)); + } + + buffer->len = length; + + if (!length) + { + buffer->content_type = HB_BUFFER_CONTENT_TYPE_INVALID; + buffer->clear_context (0); + } + buffer->clear_context (1); + + return true; +} + +/** + * hb_buffer_get_length: + * @buffer: a buffer. + * + * Returns the number of items in the buffer. + * + * Return value: buffer length. + * + * Since: 1.0 + **/ +unsigned int +hb_buffer_get_length (hb_buffer_t *buffer) +{ + return buffer->len; +} + +/** + * hb_buffer_get_glyph_infos: + * @buffer: a buffer. + * @length: (out): output array length. + * + * Returns buffer glyph information array. Returned pointer + * is valid as long as buffer contents are not modified. + * + * Return value: (transfer none) (array length=length): buffer glyph information array. + * + * Since: 1.0 + **/ +hb_glyph_info_t * +hb_buffer_get_glyph_infos (hb_buffer_t *buffer, + unsigned int *length) +{ + if (length) + *length = buffer->len; + + return (hb_glyph_info_t *) buffer->info; +} + +/** + * hb_buffer_get_glyph_positions: + * @buffer: a buffer. + * @length: (out): output length. + * + * Returns buffer glyph position array. Returned pointer + * is valid as long as buffer contents are not modified. + * + * Return value: (transfer none) (array length=length): buffer glyph position array. + * + * Since: 1.0 + **/ +hb_glyph_position_t * +hb_buffer_get_glyph_positions (hb_buffer_t *buffer, + unsigned int *length) +{ + if (!buffer->have_positions) + buffer->clear_positions (); + + if (length) + *length = buffer->len; + + return (hb_glyph_position_t *) buffer->pos; +} + +/** + * hb_buffer_reverse: + * @buffer: a buffer. + * + * Reverses buffer contents. + * + * Since: 1.0 + **/ +void +hb_buffer_reverse (hb_buffer_t *buffer) +{ + buffer->reverse (); +} + +/** + * hb_buffer_reverse_clusters: + * @buffer: a buffer. + * + * Reverses buffer clusters. That is, the buffer contents are + * reversed, then each cluster (consecutive items having the + * same cluster number) are reversed again. + * + * Since: 1.0 + **/ +void +hb_buffer_reverse_clusters (hb_buffer_t *buffer) +{ + buffer->reverse_clusters (); +} + +/** + * hb_buffer_guess_segment_properties: + * @buffer: a buffer. + * + * Sets unset buffer segment properties based on buffer Unicode + * contents. If buffer is not empty, it must have content type + * %HB_BUFFER_CONTENT_TYPE_UNICODE. + * + * If buffer script is not set (ie. is %HB_SCRIPT_INVALID), it + * will be set to the Unicode script of the first character in + * the buffer that has a script other than %HB_SCRIPT_COMMON, + * %HB_SCRIPT_INHERITED, and %HB_SCRIPT_UNKNOWN. + * + * Next, if buffer direction is not set (ie. is %HB_DIRECTION_INVALID), + * it will be set to the natural horizontal direction of the + * buffer script as returned by hb_script_get_horizontal_direction(). + * + * Finally, if buffer language is not set (ie. is %HB_LANGUAGE_INVALID), + * it will be set to the process's default language as returned by + * hb_language_get_default(). This may change in the future by + * taking buffer script into consideration when choosing a language. + * + * Since: 1.0 + **/ +void +hb_buffer_guess_segment_properties (hb_buffer_t *buffer) +{ + buffer->guess_segment_properties (); +} + +template <bool validate, typename T> +static inline void +hb_buffer_add_utf (hb_buffer_t *buffer, + const T *text, + int text_length, + unsigned int item_offset, + int item_length) +{ + typedef hb_utf_t<T, true> utf_t; + const hb_codepoint_t replacement = buffer->replacement; + + assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_UNICODE || + (!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID)); + + if (unlikely (hb_object_is_inert (buffer))) + return; + + if (text_length == -1) + text_length = utf_t::strlen (text); + + if (item_length == -1) + item_length = text_length - item_offset; + + buffer->ensure (buffer->len + item_length * sizeof (T) / 4); + + /* If buffer is empty and pre-context provided, install it. + * This check is written this way, to make sure people can + * provide pre-context in one add_utf() call, then provide + * text in a follow-up call. See: + * + * https://bugzilla.mozilla.org/show_bug.cgi?id=801410#c13 + */ + if (!buffer->len && item_offset > 0) + { + /* Add pre-context */ + buffer->clear_context (0); + const T *prev = text + item_offset; + const T *start = text; + while (start < prev && buffer->context_len[0] < buffer->CONTEXT_LENGTH) + { + hb_codepoint_t u; + prev = utf_t::prev (prev, start, &u, replacement); + buffer->context[0][buffer->context_len[0]++] = u; + } + } + + const T *next = text + item_offset; + const T *end = next + item_length; + while (next < end) + { + hb_codepoint_t u; + const T *old_next = next; + next = utf_t::next (next, end, &u, replacement); + buffer->add (u, old_next - (const T *) text); + } + + /* Add post-context */ + buffer->clear_context (1); + end = text + text_length; + while (next < end && buffer->context_len[1] < buffer->CONTEXT_LENGTH) + { + hb_codepoint_t u; + next = utf_t::next (next, end, &u, replacement); + buffer->context[1][buffer->context_len[1]++] = u; + } + + buffer->content_type = HB_BUFFER_CONTENT_TYPE_UNICODE; +} + +/** + * hb_buffer_add_utf8: + * @buffer: a buffer. + * @text: (array length=text_length): + * @text_length: + * @item_offset: + * @item_length: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_add_utf8 (hb_buffer_t *buffer, + const char *text, + int text_length, + unsigned int item_offset, + int item_length) +{ + hb_buffer_add_utf<true> (buffer, (const uint8_t *) text, text_length, item_offset, item_length); +} + +/** + * hb_buffer_add_utf16: + * @buffer: a buffer. + * @text: (array length=text_length): + * @text_length: + * @item_offset: + * @item_length: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_add_utf16 (hb_buffer_t *buffer, + const uint16_t *text, + int text_length, + unsigned int item_offset, + int item_length) +{ + hb_buffer_add_utf<true> (buffer, text, text_length, item_offset, item_length); +} + +/** + * hb_buffer_add_utf32: + * @buffer: a buffer. + * @text: (array length=text_length): + * @text_length: + * @item_offset: + * @item_length: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_add_utf32 (hb_buffer_t *buffer, + const uint32_t *text, + int text_length, + unsigned int item_offset, + int item_length) +{ + hb_buffer_add_utf<true> (buffer, text, text_length, item_offset, item_length); +} + +/** + * hb_buffer_add_codepoints: + * @buffer: a buffer. + * @text: (array length=text_length): + * @text_length: + * @item_offset: + * @item_length: + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_add_codepoints (hb_buffer_t *buffer, + const hb_codepoint_t *text, + int text_length, + unsigned int item_offset, + int item_length) +{ + hb_buffer_add_utf<false> (buffer, text, text_length, item_offset, item_length); +} + + +static int +compare_info_codepoint (const hb_glyph_info_t *pa, + const hb_glyph_info_t *pb) +{ + return (int) pb->codepoint - (int) pa->codepoint; +} + +static inline void +normalize_glyphs_cluster (hb_buffer_t *buffer, + unsigned int start, + unsigned int end, + bool backward) +{ + hb_glyph_position_t *pos = buffer->pos; + + /* Total cluster advance */ + hb_position_t total_x_advance = 0, total_y_advance = 0; + for (unsigned int i = start; i < end; i++) + { + total_x_advance += pos[i].x_advance; + total_y_advance += pos[i].y_advance; + } + + hb_position_t x_advance = 0, y_advance = 0; + for (unsigned int i = start; i < end; i++) + { + pos[i].x_offset += x_advance; + pos[i].y_offset += y_advance; + + x_advance += pos[i].x_advance; + y_advance += pos[i].y_advance; + + pos[i].x_advance = 0; + pos[i].y_advance = 0; + } + + if (backward) + { + /* Transfer all cluster advance to the last glyph. */ + pos[end - 1].x_advance = total_x_advance; + pos[end - 1].y_advance = total_y_advance; + + hb_bubble_sort (buffer->info + start, end - start - 1, compare_info_codepoint, buffer->pos + start); + } else { + /* Transfer all cluster advance to the first glyph. */ + pos[start].x_advance += total_x_advance; + pos[start].y_advance += total_y_advance; + for (unsigned int i = start + 1; i < end; i++) { + pos[i].x_offset -= total_x_advance; + pos[i].y_offset -= total_y_advance; + } + hb_bubble_sort (buffer->info + start + 1, end - start - 1, compare_info_codepoint, buffer->pos + start + 1); + } +} + +/** + * hb_buffer_normalize_glyphs: + * @buffer: a buffer. + * + * + * + * Since: 1.0 + **/ +void +hb_buffer_normalize_glyphs (hb_buffer_t *buffer) +{ + assert (buffer->have_positions); + assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS); + + bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); + + unsigned int count = buffer->len; + if (unlikely (!count)) return; + hb_glyph_info_t *info = buffer->info; + + unsigned int start = 0; + unsigned int end; + for (end = start + 1; end < count; end++) + if (info[start].cluster != info[end].cluster) { + normalize_glyphs_cluster (buffer, start, end, backward); + start = end; + } + normalize_glyphs_cluster (buffer, start, end, backward); +} |