/* * 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 ())) 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_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_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 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); }