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-rw-r--r--src/3rdparty/harfbuzz-ng/src/hb-buffer.cc1077
1 files changed, 1077 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-buffer.cc b/src/3rdparty/harfbuzz-ng/src/hb-buffer.cc
new file mode 100644
index 0000000000..340bd5351b
--- /dev/null
+++ b/src/3rdparty/harfbuzz-ng/src/hb-buffer.cc
@@ -0,0 +1,1077 @@
+/*
+ * 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;
+}
+
+void *
+hb_buffer_t::get_scratch_buffer (unsigned int *size)
+{
+ have_output = false;
+ have_positions = false;
+
+ out_len = 0;
+ out_info = info;
+
+ *size = allocated * sizeof (pos[0]);
+ return 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 ();
+
+ 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;
+ flags = HB_BUFFER_FLAG_DEFAULT;
+
+ 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++;
+}
+
+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)
+{
+ 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)
+{
+ 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_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_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_SEGMENT_PROPERTIES_DEFAULT,
+ HB_BUFFER_FLAG_DEFAULT,
+
+ HB_BUFFER_CONTENT_TYPE_INVALID,
+ 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_t *
+hb_buffer_reference (hb_buffer_t *buffer)
+{
+ return hb_object_reference (buffer);
+}
+
+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_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);
+}
+
+void *
+hb_buffer_get_user_data (hb_buffer_t *buffer,
+ hb_user_data_key_t *key)
+{
+ return hb_object_get_user_data (buffer, key);
+}
+
+
+void
+hb_buffer_set_content_type (hb_buffer_t *buffer,
+ hb_buffer_content_type_t content_type)
+{
+ buffer->content_type = content_type;
+}
+
+hb_buffer_content_type_t
+hb_buffer_get_content_type (hb_buffer_t *buffer)
+{
+ return buffer->content_type;
+}
+
+
+void
+hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
+ hb_unicode_funcs_t *unicode)
+{
+ if (unlikely (hb_object_is_inert (buffer)))
+ return;
+
+ if (!unicode)
+ unicode = hb_unicode_funcs_get_default ();
+
+
+ hb_unicode_funcs_reference (unicode);
+ hb_unicode_funcs_destroy (buffer->unicode);
+ buffer->unicode = unicode;
+}
+
+hb_unicode_funcs_t *
+hb_buffer_get_unicode_funcs (hb_buffer_t *buffer)
+{
+ return buffer->unicode;
+}
+
+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_direction_t
+hb_buffer_get_direction (hb_buffer_t *buffer)
+{
+ return buffer->props.direction;
+}
+
+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_script_t
+hb_buffer_get_script (hb_buffer_t *buffer)
+{
+ return buffer->props.script;
+}
+
+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_language_t
+hb_buffer_get_language (hb_buffer_t *buffer)
+{
+ return buffer->props.language;
+}
+
+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;
+}
+
+void
+hb_buffer_get_segment_properties (hb_buffer_t *buffer,
+ hb_segment_properties_t *props)
+{
+ *props = buffer->props;
+}
+
+
+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_flags_t
+hb_buffer_get_flags (hb_buffer_t *buffer)
+{
+ return buffer->flags;
+}
+
+
+void
+hb_buffer_reset (hb_buffer_t *buffer)
+{
+ buffer->reset ();
+}
+
+void
+hb_buffer_clear_contents (hb_buffer_t *buffer)
+{
+ buffer->clear ();
+}
+
+hb_bool_t
+hb_buffer_pre_allocate (hb_buffer_t *buffer, unsigned int size)
+{
+ return buffer->ensure (size);
+}
+
+hb_bool_t
+hb_buffer_allocation_successful (hb_buffer_t *buffer)
+{
+ return !buffer->in_error;
+}
+
+void
+hb_buffer_add (hb_buffer_t *buffer,
+ hb_codepoint_t codepoint,
+ unsigned int cluster)
+{
+ buffer->add (codepoint, cluster);
+ buffer->clear_context (1);
+}
+
+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->clear_context (0);
+ buffer->clear_context (1);
+
+ return true;
+}
+
+unsigned int
+hb_buffer_get_length (hb_buffer_t *buffer)
+{
+ return buffer->len;
+}
+
+/* Return value valid as long as buffer not modified */
+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;
+}
+
+/* Return value valid as long as buffer not modified */
+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;
+}
+
+void
+hb_buffer_reverse (hb_buffer_t *buffer)
+{
+ buffer->reverse ();
+}
+
+void
+hb_buffer_reverse_clusters (hb_buffer_t *buffer)
+{
+ buffer->reverse_clusters ();
+}
+
+void
+hb_buffer_guess_segment_properties (hb_buffer_t *buffer)
+{
+ buffer->guess_segment_properties ();
+}
+
+template <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)
+{
+ 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 = hb_utf_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 = hb_utf_prev (prev, start, &u);
+ 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 = hb_utf_next (next, end, &u);
+ 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 = hb_utf_next (next, end, &u);
+ buffer->context[1][buffer->context_len[1]++] = u;
+ }
+
+ buffer->content_type = HB_BUFFER_CONTENT_TYPE_UNICODE;
+}
+
+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 (buffer, (const uint8_t *) text, text_length, item_offset, item_length);
+}
+
+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 (buffer, text, text_length, item_offset, item_length);
+}
+
+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 (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);
+ }
+}
+
+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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 11:13:05 +0000