}
+/**
+ * hb_buffer_append:
+ * @buffer: an #hb_buffer_t.
+ * @source: source #hb_buffer_t.
+ * @start: start index into source buffer to copy. Use 0 to copy from start of buffer.
+ * @end: end index into source buffer to copy. Use (unsigned int) -1 to copy to end of buffer.
+ *
+ * Append (part of) contents of another buffer to this buffer.
+ *
+ * Since: 1.5.0
+ **/
+HB_EXTERN void
+hb_buffer_append (hb_buffer_t *buffer,
+ hb_buffer_t *source,
+ unsigned int start,
+ unsigned int end)
+{
+ assert (!buffer->have_output && !source->have_output);
+ assert (buffer->have_positions == source->have_positions);
+ assert (buffer->content_type == source->content_type ||
+ !buffer->len || !source->len);
+
+ if (end > source->len)
+ end = source->len;
+ if (start > end)
+ start = end;
+ if (start == end)
+ return;
+
+ if (!buffer->len)
+ buffer->content_type = source->content_type;
+
+ if (buffer->len + (end - start) > buffer->len) /* Overflows. */
+ {
+ buffer->in_error = true;
+ return;
+ }
+
+ unsigned int orig_len = buffer->len;
+ hb_buffer_set_length (buffer, buffer->len + (end - start));
+ if (buffer->in_error)
+ return;
+
+ memcpy (buffer->info + orig_len, source->info + start, (end - start) * sizeof (buffer->info[0]));
+ if (buffer->have_positions)
+ memcpy (buffer->pos + orig_len, source->pos + start, (end - start) * sizeof (buffer->pos[0]));
+}
+
+
static int
compare_info_codepoint (const hb_glyph_info_t *pa,
const hb_glyph_info_t *pb)
hb_buffer_normalize_glyphs (hb_buffer_t *buffer)
{
assert (buffer->have_positions);
- assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
+ assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS ||
+ (!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID));
bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
hb_buffer_get_user_data (hb_buffer_t *buffer,
hb_user_data_key_t *key);
+
/**
* hb_buffer_content_type_t:
* @HB_BUFFER_CONTENT_TYPE_INVALID: Initial value for new buffer.
unsigned int item_offset,
int item_length);
+HB_EXTERN void
+hb_buffer_append (hb_buffer_t *buffer,
+ hb_buffer_t *source,
+ unsigned int start,
+ unsigned int end);
HB_EXTERN hb_bool_t
hb_buffer_set_length (hb_buffer_t *buffer,