/* cairo - a vector graphics library with display and print output * * Copyright © 2003 University of Southern California * Copyright © 2005 Red Hat, Inc * Copyright © 2006 Keith Packard * Copyright © 2006 Red Hat, Inc * * This library is free software; you can redistribute it and/or * modify it either under the terms of the GNU Lesser General Public * License version 2.1 as published by the Free Software Foundation * (the "LGPL") or, at your option, under the terms of the Mozilla * Public License Version 1.1 (the "MPL"). If you do not alter this * notice, a recipient may use your version of this file under either * the MPL or the LGPL. * * You should have received a copy of the LGPL along with this library * in the file COPYING-LGPL-2.1; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA * You should have received a copy of the MPL along with this library * in the file COPYING-MPL-1.1 * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY * OF ANY KIND, either express or implied. See the LGPL or the MPL for * the specific language governing rights and limitations. * * The Original Code is the cairo graphics library. * * The Initial Developer of the Original Code is University of Southern * California. * * Contributor(s): * Carl D. Worth * Kristian Høgsberg * Keith Packard * Adrian Johnson */ #define _BSD_SOURCE /* for snprintf(), strdup() */ #include "cairoint.h" #include "cairo-error-private.h" #if CAIRO_HAS_FONT_SUBSET #include "cairo-scaled-font-subsets-private.h" #include "cairo-user-font-private.h" #define MAX_GLYPHS_PER_SIMPLE_FONT 256 #define MAX_GLYPHS_PER_COMPOSITE_FONT 65536 typedef enum { CAIRO_SUBSETS_SCALED, CAIRO_SUBSETS_SIMPLE, CAIRO_SUBSETS_COMPOSITE } cairo_subsets_type_t; typedef enum { CAIRO_SUBSETS_FOREACH_UNSCALED, CAIRO_SUBSETS_FOREACH_SCALED, CAIRO_SUBSETS_FOREACH_USER } cairo_subsets_foreach_type_t; typedef struct _cairo_sub_font { cairo_hash_entry_t base; cairo_bool_t is_scaled; cairo_bool_t is_composite; cairo_bool_t is_user; cairo_bool_t use_latin_subset; cairo_scaled_font_subsets_t *parent; cairo_scaled_font_t *scaled_font; unsigned int font_id; int current_subset; int num_glyphs_in_current_subset; int num_glyphs_in_latin_subset; int max_glyphs_per_subset; char latin_char_map[256]; cairo_hash_table_t *sub_font_glyphs; struct _cairo_sub_font *next; } cairo_sub_font_t; struct _cairo_scaled_font_subsets { cairo_subsets_type_t type; cairo_bool_t use_latin_subset; int max_glyphs_per_unscaled_subset_used; cairo_hash_table_t *unscaled_sub_fonts; cairo_sub_font_t *unscaled_sub_fonts_list; cairo_sub_font_t *unscaled_sub_fonts_list_end; int max_glyphs_per_scaled_subset_used; cairo_hash_table_t *scaled_sub_fonts; cairo_sub_font_t *scaled_sub_fonts_list; cairo_sub_font_t *scaled_sub_fonts_list_end; int num_sub_fonts; }; typedef struct _cairo_sub_font_glyph { cairo_hash_entry_t base; unsigned int subset_id; unsigned int subset_glyph_index; double x_advance; double y_advance; cairo_bool_t is_latin; int latin_character; cairo_bool_t is_mapped; uint32_t unicode; char *utf8; int utf8_len; } cairo_sub_font_glyph_t; typedef struct _cairo_sub_font_collection { unsigned long *glyphs; /* scaled_font_glyph_index */ char **utf8; unsigned int glyphs_size; int *to_latin_char; unsigned long *latin_to_subset_glyph_index; unsigned int max_glyph; unsigned int num_glyphs; unsigned int subset_id; cairo_status_t status; cairo_scaled_font_subset_callback_func_t font_subset_callback; void *font_subset_callback_closure; } cairo_sub_font_collection_t; typedef struct _cairo_string_entry { cairo_hash_entry_t base; char *string; } cairo_string_entry_t; static cairo_status_t _cairo_sub_font_map_glyph (cairo_sub_font_t *sub_font, unsigned long scaled_font_glyph_index, const char * utf8, int utf8_len, cairo_scaled_font_subsets_glyph_t *subset_glyph); static void _cairo_sub_font_glyph_init_key (cairo_sub_font_glyph_t *sub_font_glyph, unsigned long scaled_font_glyph_index) { sub_font_glyph->base.hash = scaled_font_glyph_index; } static cairo_sub_font_glyph_t * _cairo_sub_font_glyph_create (unsigned long scaled_font_glyph_index, unsigned int subset_id, unsigned int subset_glyph_index, double x_advance, double y_advance, int latin_character, uint32_t unicode, char *utf8, int utf8_len) { cairo_sub_font_glyph_t *sub_font_glyph; sub_font_glyph = malloc (sizeof (cairo_sub_font_glyph_t)); if (unlikely (sub_font_glyph == NULL)) { _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); return NULL; } _cairo_sub_font_glyph_init_key (sub_font_glyph, scaled_font_glyph_index); sub_font_glyph->subset_id = subset_id; sub_font_glyph->subset_glyph_index = subset_glyph_index; sub_font_glyph->x_advance = x_advance; sub_font_glyph->y_advance = y_advance; sub_font_glyph->is_latin = (latin_character >= 0); sub_font_glyph->latin_character = latin_character; sub_font_glyph->is_mapped = FALSE; sub_font_glyph->unicode = unicode; sub_font_glyph->utf8 = utf8; sub_font_glyph->utf8_len = utf8_len; return sub_font_glyph; } static void _cairo_sub_font_glyph_destroy (cairo_sub_font_glyph_t *sub_font_glyph) { free (sub_font_glyph->utf8); free (sub_font_glyph); } static void _cairo_sub_font_glyph_pluck (void *entry, void *closure) { cairo_sub_font_glyph_t *sub_font_glyph = entry; cairo_hash_table_t *sub_font_glyphs = closure; _cairo_hash_table_remove (sub_font_glyphs, &sub_font_glyph->base); _cairo_sub_font_glyph_destroy (sub_font_glyph); } static void _cairo_sub_font_glyph_collect (void *entry, void *closure) { cairo_sub_font_glyph_t *sub_font_glyph = entry; cairo_sub_font_collection_t *collection = closure; unsigned long scaled_font_glyph_index; unsigned int subset_glyph_index; if (sub_font_glyph->subset_id != collection->subset_id) return; scaled_font_glyph_index = sub_font_glyph->base.hash; subset_glyph_index = sub_font_glyph->subset_glyph_index; /* Ensure we don't exceed the allocated bounds. */ assert (subset_glyph_index < collection->glyphs_size); collection->glyphs[subset_glyph_index] = scaled_font_glyph_index; collection->utf8[subset_glyph_index] = sub_font_glyph->utf8; collection->to_latin_char[subset_glyph_index] = sub_font_glyph->latin_character; if (sub_font_glyph->is_latin) collection->latin_to_subset_glyph_index[sub_font_glyph->latin_character] = subset_glyph_index; if (subset_glyph_index > collection->max_glyph) collection->max_glyph = subset_glyph_index; collection->num_glyphs++; } static cairo_bool_t _cairo_sub_fonts_equal (const void *key_a, const void *key_b) { const cairo_sub_font_t *sub_font_a = key_a; const cairo_sub_font_t *sub_font_b = key_b; cairo_scaled_font_t *a = sub_font_a->scaled_font; cairo_scaled_font_t *b = sub_font_b->scaled_font; if (sub_font_a->is_scaled) return a == b; else return a->font_face == b->font_face || a->original_font_face == b->original_font_face; } static void _cairo_sub_font_init_key (cairo_sub_font_t *sub_font, cairo_scaled_font_t *scaled_font) { if (sub_font->is_scaled) { sub_font->base.hash = (unsigned long) scaled_font; sub_font->scaled_font = scaled_font; } else { sub_font->base.hash = (unsigned long) scaled_font->font_face; sub_font->scaled_font = scaled_font; } } static cairo_status_t _cairo_sub_font_create (cairo_scaled_font_subsets_t *parent, cairo_scaled_font_t *scaled_font, unsigned int font_id, int max_glyphs_per_subset, cairo_bool_t is_scaled, cairo_bool_t is_composite, cairo_sub_font_t **sub_font_out) { cairo_sub_font_t *sub_font; int i; sub_font = malloc (sizeof (cairo_sub_font_t)); if (unlikely (sub_font == NULL)) return _cairo_error (CAIRO_STATUS_NO_MEMORY); sub_font->is_scaled = is_scaled; sub_font->is_composite = is_composite; sub_font->is_user = _cairo_font_face_is_user (scaled_font->font_face); _cairo_sub_font_init_key (sub_font, scaled_font); sub_font->parent = parent; sub_font->scaled_font = scaled_font; sub_font->font_id = font_id; sub_font->use_latin_subset = parent->use_latin_subset; /* latin subsets of Type 3 and CID CFF fonts are not supported */ if (sub_font->is_user || sub_font->is_scaled || _cairo_cff_scaled_font_is_cid_cff (scaled_font) ) { sub_font->use_latin_subset = FALSE; } if (sub_font->use_latin_subset) sub_font->current_subset = 1; /* reserve subset 0 for latin glyphs */ else sub_font->current_subset = 0; sub_font->num_glyphs_in_current_subset = 0; sub_font->num_glyphs_in_latin_subset = 0; sub_font->max_glyphs_per_subset = max_glyphs_per_subset; for (i = 0; i < 256; i++) sub_font->latin_char_map[i] = FALSE; sub_font->sub_font_glyphs = _cairo_hash_table_create (NULL); if (unlikely (sub_font->sub_font_glyphs == NULL)) { free (sub_font); return _cairo_error (CAIRO_STATUS_NO_MEMORY); } sub_font->next = NULL; *sub_font_out = sub_font; return CAIRO_STATUS_SUCCESS; } static void _cairo_sub_font_destroy (cairo_sub_font_t *sub_font) { _cairo_hash_table_foreach (sub_font->sub_font_glyphs, _cairo_sub_font_glyph_pluck, sub_font->sub_font_glyphs); _cairo_hash_table_destroy (sub_font->sub_font_glyphs); cairo_scaled_font_destroy (sub_font->scaled_font); free (sub_font); } static void _cairo_sub_font_pluck (void *entry, void *closure) { cairo_sub_font_t *sub_font = entry; cairo_hash_table_t *sub_fonts = closure; _cairo_hash_table_remove (sub_fonts, &sub_font->base); _cairo_sub_font_destroy (sub_font); } /* Characters 0x80 to 0x9f in the winansi encoding. * All other characters in the range 0x00 to 0xff map 1:1 to unicode */ static unsigned int _winansi_0x80_to_0x9f[] = { 0x20ac, 0x0000, 0x201a, 0x0192, 0x201e, 0x2026, 0x2020, 0x2021, 0x02c6, 0x2030, 0x0160, 0x2039, 0x0152, 0x0000, 0x017d, 0x0000, 0x0000, 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014, 0x02dc, 0x2122, 0x0161, 0x203a, 0x0153, 0x0000, 0x017e, 0x0178 }; int _cairo_unicode_to_winansi (unsigned long uni) { int i; /* exclude the extra "hyphen" at 0xad to avoid duplicate glyphnames */ if ((uni >= 0x20 && uni <= 0x7e) || (uni >= 0xa1 && uni <= 0xff && uni != 0xad) || uni == 0) return uni; for (i = 0; i < 32; i++) if (_winansi_0x80_to_0x9f[i] == uni) return i + 0x80; return -1; } static cairo_status_t _cairo_sub_font_glyph_lookup_unicode (cairo_scaled_font_t *scaled_font, unsigned long scaled_font_glyph_index, uint32_t *unicode_out, char **utf8_out, int *utf8_len_out) { uint32_t unicode; char buf[8]; int len; cairo_status_t status; /* Do a reverse lookup on the glyph index. unicode is -1 if the * index could not be mapped to a unicode character. */ unicode = -1; status = _cairo_truetype_index_to_ucs4 (scaled_font, scaled_font_glyph_index, &unicode); if (_cairo_status_is_error (status)) return status; if (unicode == (uint32_t)-1 && scaled_font->backend->index_to_ucs4) { status = scaled_font->backend->index_to_ucs4 (scaled_font, scaled_font_glyph_index, &unicode); if (unlikely (status)) return status; } *unicode_out = unicode; *utf8_out = NULL; *utf8_len_out = 0; if (unicode != (uint32_t) -1) { len = _cairo_ucs4_to_utf8 (unicode, buf); if (len > 0) { *utf8_out = malloc (len + 1); if (unlikely (*utf8_out == NULL)) return _cairo_error (CAIRO_STATUS_NO_MEMORY); memcpy (*utf8_out, buf, len); (*utf8_out)[len] = 0; *utf8_len_out = len; } } return CAIRO_STATUS_SUCCESS; } static cairo_status_t _cairo_sub_font_glyph_map_to_unicode (cairo_sub_font_glyph_t *sub_font_glyph, const char *utf8, int utf8_len, cairo_bool_t *is_mapped) { *is_mapped = FALSE; if (utf8_len < 0) return CAIRO_STATUS_SUCCESS; if (utf8 != NULL && utf8_len != 0 && utf8[utf8_len - 1] == '\0') utf8_len--; if (utf8 != NULL && utf8_len != 0) { if (sub_font_glyph->utf8 != NULL) { if (utf8_len == sub_font_glyph->utf8_len && memcmp (utf8, sub_font_glyph->utf8, utf8_len) == 0) { /* Requested utf8 mapping matches the existing mapping */ *is_mapped = TRUE; } } else { /* No existing mapping. Use the requested mapping */ sub_font_glyph->utf8 = malloc (utf8_len + 1); if (unlikely (sub_font_glyph->utf8 == NULL)) return _cairo_error (CAIRO_STATUS_NO_MEMORY); memcpy (sub_font_glyph->utf8, utf8, utf8_len); sub_font_glyph->utf8[utf8_len] = 0; sub_font_glyph->utf8_len = utf8_len; *is_mapped = TRUE; } } return CAIRO_STATUS_SUCCESS; } static cairo_int_status_t _cairo_sub_font_lookup_glyph (cairo_sub_font_t *sub_font, unsigned long scaled_font_glyph_index, const char *utf8, int utf8_len, cairo_scaled_font_subsets_glyph_t *subset_glyph) { cairo_sub_font_glyph_t key, *sub_font_glyph; cairo_int_status_t status; _cairo_sub_font_glyph_init_key (&key, scaled_font_glyph_index); sub_font_glyph = _cairo_hash_table_lookup (sub_font->sub_font_glyphs, &key.base); if (sub_font_glyph != NULL) { subset_glyph->font_id = sub_font->font_id; subset_glyph->subset_id = sub_font_glyph->subset_id; if (sub_font_glyph->is_latin) subset_glyph->subset_glyph_index = sub_font_glyph->latin_character; else subset_glyph->subset_glyph_index = sub_font_glyph->subset_glyph_index; subset_glyph->is_scaled = sub_font->is_scaled; subset_glyph->is_composite = sub_font->is_composite; subset_glyph->is_latin = sub_font_glyph->is_latin; subset_glyph->x_advance = sub_font_glyph->x_advance; subset_glyph->y_advance = sub_font_glyph->y_advance; status = _cairo_sub_font_glyph_map_to_unicode (sub_font_glyph, utf8, utf8_len, &subset_glyph->utf8_is_mapped); subset_glyph->unicode = sub_font_glyph->unicode; return status; } return CAIRO_INT_STATUS_UNSUPPORTED; } static cairo_status_t _cairo_sub_font_add_glyph (cairo_sub_font_t *sub_font, unsigned long scaled_font_glyph_index, cairo_bool_t is_latin, int latin_character, uint32_t unicode, char *utf8, int utf8_len, cairo_sub_font_glyph_t **sub_font_glyph_out) { cairo_scaled_glyph_t *scaled_glyph; cairo_sub_font_glyph_t *sub_font_glyph; int *num_glyphs_in_subset_ptr; double x_advance; double y_advance; cairo_int_status_t status; _cairo_scaled_font_freeze_cache (sub_font->scaled_font); status = _cairo_scaled_glyph_lookup (sub_font->scaled_font, scaled_font_glyph_index, CAIRO_SCALED_GLYPH_INFO_METRICS, &scaled_glyph); assert (status != CAIRO_INT_STATUS_UNSUPPORTED); if (unlikely (status)) { _cairo_scaled_font_thaw_cache (sub_font->scaled_font); return status; } x_advance = scaled_glyph->metrics.x_advance; y_advance = scaled_glyph->metrics.y_advance; _cairo_scaled_font_thaw_cache (sub_font->scaled_font); if (!is_latin && sub_font->num_glyphs_in_current_subset == sub_font->max_glyphs_per_subset) { sub_font->current_subset++; sub_font->num_glyphs_in_current_subset = 0; } if (is_latin) num_glyphs_in_subset_ptr = &sub_font->num_glyphs_in_latin_subset; else num_glyphs_in_subset_ptr = &sub_font->num_glyphs_in_current_subset; /* Reserve first glyph in subset for the .notdef glyph except for * Type 3 fonts */ if (*num_glyphs_in_subset_ptr == 0 && scaled_font_glyph_index != 0 && ! _cairo_font_face_is_user (sub_font->scaled_font->font_face)) { status = _cairo_sub_font_add_glyph (sub_font, 0, is_latin, 0, 0, NULL, -1, &sub_font_glyph); if (unlikely (status)) return status; } sub_font_glyph = _cairo_sub_font_glyph_create (scaled_font_glyph_index, is_latin ? 0 : sub_font->current_subset, *num_glyphs_in_subset_ptr, x_advance, y_advance, is_latin ? latin_character : -1, unicode, utf8, utf8_len); if (unlikely (sub_font_glyph == NULL)) return _cairo_error (CAIRO_STATUS_NO_MEMORY); status = _cairo_hash_table_insert (sub_font->sub_font_glyphs, &sub_font_glyph->base); if (unlikely (status)) { _cairo_sub_font_glyph_destroy (sub_font_glyph); return status; } (*num_glyphs_in_subset_ptr)++; if (sub_font->is_scaled) { if (*num_glyphs_in_subset_ptr > sub_font->parent->max_glyphs_per_scaled_subset_used) sub_font->parent->max_glyphs_per_scaled_subset_used = *num_glyphs_in_subset_ptr; } else { if (*num_glyphs_in_subset_ptr > sub_font->parent->max_glyphs_per_unscaled_subset_used) sub_font->parent->max_glyphs_per_unscaled_subset_used = *num_glyphs_in_subset_ptr; } *sub_font_glyph_out = sub_font_glyph; return CAIRO_STATUS_SUCCESS; } static cairo_status_t _cairo_sub_font_map_glyph (cairo_sub_font_t *sub_font, unsigned long scaled_font_glyph_index, const char *text_utf8, int text_utf8_len, cairo_scaled_font_subsets_glyph_t *subset_glyph) { cairo_sub_font_glyph_t key, *sub_font_glyph; cairo_status_t status; _cairo_sub_font_glyph_init_key (&key, scaled_font_glyph_index); sub_font_glyph = _cairo_hash_table_lookup (sub_font->sub_font_glyphs, &key.base); if (sub_font_glyph == NULL) { uint32_t font_unicode; char *font_utf8; int font_utf8_len; cairo_bool_t is_latin; int latin_character; status = _cairo_sub_font_glyph_lookup_unicode (sub_font->scaled_font, scaled_font_glyph_index, &font_unicode, &font_utf8, &font_utf8_len); if (unlikely(status)) return status; /* If the supplied utf8 is a valid single character, use it * instead of the font lookup */ if (text_utf8 != NULL && text_utf8_len > 0) { uint32_t *ucs4; int ucs4_len; status = _cairo_utf8_to_ucs4 (text_utf8, text_utf8_len, &ucs4, &ucs4_len); if (status == CAIRO_STATUS_SUCCESS) { if (ucs4_len == 1) { font_unicode = ucs4[0]; free (font_utf8); font_utf8 = malloc (text_utf8_len + 1); if (font_utf8 == NULL) { free (ucs4); return _cairo_error (CAIRO_STATUS_NO_MEMORY); } memcpy (font_utf8, text_utf8, text_utf8_len); font_utf8[text_utf8_len] = 0; font_utf8_len = text_utf8_len; } free (ucs4); } } /* If glyph is in the winansi encoding and font is not a user * font, put glyph in the latin subset. If glyph is .notdef * the latin subset is preferred but only if the latin subset * already contains at least one glyph. We don't want to * create a separate subset just for the .notdef glyph. */ is_latin = FALSE; latin_character = -1; if (sub_font->use_latin_subset && (! _cairo_font_face_is_user (sub_font->scaled_font->font_face))) { latin_character = _cairo_unicode_to_winansi (font_unicode); if (latin_character > 0 || (latin_character == 0 && sub_font->num_glyphs_in_latin_subset > 0)) { if (!sub_font->latin_char_map[latin_character]) { sub_font->latin_char_map[latin_character] = TRUE; is_latin = TRUE; } } } status = _cairo_sub_font_add_glyph (sub_font, scaled_font_glyph_index, is_latin, latin_character, font_unicode, font_utf8, font_utf8_len, &sub_font_glyph); if (unlikely(status)) return status; } subset_glyph->font_id = sub_font->font_id; subset_glyph->subset_id = sub_font_glyph->subset_id; if (sub_font_glyph->is_latin) subset_glyph->subset_glyph_index = sub_font_glyph->latin_character; else subset_glyph->subset_glyph_index = sub_font_glyph->subset_glyph_index; subset_glyph->is_scaled = sub_font->is_scaled; subset_glyph->is_composite = sub_font->is_composite; subset_glyph->is_latin = sub_font_glyph->is_latin; subset_glyph->x_advance = sub_font_glyph->x_advance; subset_glyph->y_advance = sub_font_glyph->y_advance; status = _cairo_sub_font_glyph_map_to_unicode (sub_font_glyph, text_utf8, text_utf8_len, &subset_glyph->utf8_is_mapped); subset_glyph->unicode = sub_font_glyph->unicode; return status; } static void _cairo_sub_font_collect (void *entry, void *closure) { cairo_sub_font_t *sub_font = entry; cairo_sub_font_collection_t *collection = closure; cairo_scaled_font_subset_t subset; int i; unsigned int j; if (collection->status) return; collection->status = sub_font->scaled_font->status; if (collection->status) return; for (i = 0; i <= sub_font->current_subset; i++) { collection->subset_id = i; collection->num_glyphs = 0; collection->max_glyph = 0; memset (collection->latin_to_subset_glyph_index, 0, 256*sizeof(unsigned long)); _cairo_hash_table_foreach (sub_font->sub_font_glyphs, _cairo_sub_font_glyph_collect, collection); if (collection->status) break; if (collection->num_glyphs == 0) continue; /* Ensure the resulting array has no uninitialized holes */ assert (collection->num_glyphs == collection->max_glyph + 1); subset.scaled_font = sub_font->scaled_font; subset.is_composite = sub_font->is_composite; subset.is_scaled = sub_font->is_scaled; subset.font_id = sub_font->font_id; subset.subset_id = i; subset.glyphs = collection->glyphs; subset.utf8 = collection->utf8; subset.num_glyphs = collection->num_glyphs; subset.glyph_names = NULL; subset.is_latin = FALSE; if (sub_font->use_latin_subset && i == 0) { subset.is_latin = TRUE; subset.to_latin_char = collection->to_latin_char; subset.latin_to_subset_glyph_index = collection->latin_to_subset_glyph_index; } else { subset.to_latin_char = NULL; subset.latin_to_subset_glyph_index = NULL; } collection->status = (collection->font_subset_callback) (&subset, collection->font_subset_callback_closure); if (subset.glyph_names != NULL) { for (j = 0; j < collection->num_glyphs; j++) free (subset.glyph_names[j]); free (subset.glyph_names); } if (collection->status) break; } } static cairo_scaled_font_subsets_t * _cairo_scaled_font_subsets_create_internal (cairo_subsets_type_t type) { cairo_scaled_font_subsets_t *subsets; subsets = malloc (sizeof (cairo_scaled_font_subsets_t)); if (unlikely (subsets == NULL)) { _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); return NULL; } subsets->type = type; subsets->use_latin_subset = FALSE; subsets->max_glyphs_per_unscaled_subset_used = 0; subsets->max_glyphs_per_scaled_subset_used = 0; subsets->num_sub_fonts = 0; subsets->unscaled_sub_fonts = _cairo_hash_table_create (_cairo_sub_fonts_equal); if (! subsets->unscaled_sub_fonts) { free (subsets); return NULL; } subsets->unscaled_sub_fonts_list = NULL; subsets->unscaled_sub_fonts_list_end = NULL; subsets->scaled_sub_fonts = _cairo_hash_table_create (_cairo_sub_fonts_equal); if (! subsets->scaled_sub_fonts) { _cairo_hash_table_destroy (subsets->unscaled_sub_fonts); free (subsets); return NULL; } subsets->scaled_sub_fonts_list = NULL; subsets->scaled_sub_fonts_list_end = NULL; return subsets; } cairo_scaled_font_subsets_t * _cairo_scaled_font_subsets_create_scaled (void) { return _cairo_scaled_font_subsets_create_internal (CAIRO_SUBSETS_SCALED); } cairo_scaled_font_subsets_t * _cairo_scaled_font_subsets_create_simple (void) { return _cairo_scaled_font_subsets_create_internal (CAIRO_SUBSETS_SIMPLE); } cairo_scaled_font_subsets_t * _cairo_scaled_font_subsets_create_composite (void) { return _cairo_scaled_font_subsets_create_internal (CAIRO_SUBSETS_COMPOSITE); } void _cairo_scaled_font_subsets_destroy (cairo_scaled_font_subsets_t *subsets) { _cairo_hash_table_foreach (subsets->scaled_sub_fonts, _cairo_sub_font_pluck, subsets->scaled_sub_fonts); _cairo_hash_table_destroy (subsets->scaled_sub_fonts); _cairo_hash_table_foreach (subsets->unscaled_sub_fonts, _cairo_sub_font_pluck, subsets->unscaled_sub_fonts); _cairo_hash_table_destroy (subsets->unscaled_sub_fonts); free (subsets); } void _cairo_scaled_font_subsets_enable_latin_subset (cairo_scaled_font_subsets_t *font_subsets, cairo_bool_t use_latin) { font_subsets->use_latin_subset = use_latin; } cairo_status_t _cairo_scaled_font_subsets_map_glyph (cairo_scaled_font_subsets_t *subsets, cairo_scaled_font_t *scaled_font, unsigned long scaled_font_glyph_index, const char * utf8, int utf8_len, cairo_scaled_font_subsets_glyph_t *subset_glyph) { cairo_sub_font_t key, *sub_font; cairo_scaled_glyph_t *scaled_glyph; cairo_font_face_t *font_face; cairo_matrix_t identity; cairo_font_options_t font_options; cairo_scaled_font_t *unscaled_font; cairo_int_status_t status; int max_glyphs; cairo_bool_t type1_font; /* Lookup glyph in unscaled subsets */ if (subsets->type != CAIRO_SUBSETS_SCALED) { key.is_scaled = FALSE; _cairo_sub_font_init_key (&key, scaled_font); sub_font = _cairo_hash_table_lookup (subsets->unscaled_sub_fonts, &key.base); if (sub_font != NULL) { status = _cairo_sub_font_lookup_glyph (sub_font, scaled_font_glyph_index, utf8, utf8_len, subset_glyph); if (status != CAIRO_INT_STATUS_UNSUPPORTED) return status; } } /* Lookup glyph in scaled subsets */ key.is_scaled = TRUE; _cairo_sub_font_init_key (&key, scaled_font); sub_font = _cairo_hash_table_lookup (subsets->scaled_sub_fonts, &key.base); if (sub_font != NULL) { status = _cairo_sub_font_lookup_glyph (sub_font, scaled_font_glyph_index, utf8, utf8_len, subset_glyph); if (status != CAIRO_INT_STATUS_UNSUPPORTED) return status; } /* Glyph not found. Determine whether the glyph is outline or * bitmap and add to the appropriate subset. * * glyph_index 0 (the .notdef glyph) is a special case. Some fonts * will return CAIRO_INT_STATUS_UNSUPPORTED when doing a * _scaled_glyph_lookup(_GLYPH_INFO_PATH). Type1-fallback creates * empty glyphs in this case so we can put the glyph in a unscaled * subset. */ if (scaled_font_glyph_index == 0 || _cairo_font_face_is_user (scaled_font->font_face)) { status = CAIRO_STATUS_SUCCESS; } else { _cairo_scaled_font_freeze_cache (scaled_font); status = _cairo_scaled_glyph_lookup (scaled_font, scaled_font_glyph_index, CAIRO_SCALED_GLYPH_INFO_PATH, &scaled_glyph); _cairo_scaled_font_thaw_cache (scaled_font); } if (_cairo_int_status_is_error (status)) return status; if (status == CAIRO_INT_STATUS_SUCCESS && subsets->type != CAIRO_SUBSETS_SCALED && ! _cairo_font_face_is_user (scaled_font->font_face)) { /* Path available. Add to unscaled subset. */ key.is_scaled = FALSE; _cairo_sub_font_init_key (&key, scaled_font); sub_font = _cairo_hash_table_lookup (subsets->unscaled_sub_fonts, &key.base); if (sub_font == NULL) { font_face = cairo_scaled_font_get_font_face (scaled_font); cairo_matrix_init_identity (&identity); _cairo_font_options_init_default (&font_options); cairo_font_options_set_hint_style (&font_options, CAIRO_HINT_STYLE_NONE); cairo_font_options_set_hint_metrics (&font_options, CAIRO_HINT_METRICS_OFF); unscaled_font = cairo_scaled_font_create (font_face, &identity, &identity, &font_options); if (unlikely (unscaled_font->status)) return unscaled_font->status; subset_glyph->is_scaled = FALSE; type1_font = _cairo_type1_scaled_font_is_type1 (unscaled_font); if (subsets->type == CAIRO_SUBSETS_COMPOSITE && !type1_font) { max_glyphs = MAX_GLYPHS_PER_COMPOSITE_FONT; subset_glyph->is_composite = TRUE; } else { max_glyphs = MAX_GLYPHS_PER_SIMPLE_FONT; subset_glyph->is_composite = FALSE; } status = _cairo_sub_font_create (subsets, unscaled_font, subsets->num_sub_fonts, max_glyphs, subset_glyph->is_scaled, subset_glyph->is_composite, &sub_font); if (unlikely (status)) { cairo_scaled_font_destroy (unscaled_font); return status; } status = _cairo_hash_table_insert (subsets->unscaled_sub_fonts, &sub_font->base); if (unlikely (status)) { _cairo_sub_font_destroy (sub_font); return status; } if (!subsets->unscaled_sub_fonts_list) subsets->unscaled_sub_fonts_list = sub_font; else subsets->unscaled_sub_fonts_list_end->next = sub_font; subsets->unscaled_sub_fonts_list_end = sub_font; subsets->num_sub_fonts++; } } else { /* No path available. Add to scaled subset. */ key.is_scaled = TRUE; _cairo_sub_font_init_key (&key, scaled_font); sub_font = _cairo_hash_table_lookup (subsets->scaled_sub_fonts, &key.base); if (sub_font == NULL) { subset_glyph->is_scaled = TRUE; subset_glyph->is_composite = FALSE; if (subsets->type == CAIRO_SUBSETS_SCALED) max_glyphs = INT_MAX; else max_glyphs = MAX_GLYPHS_PER_SIMPLE_FONT; status = _cairo_sub_font_create (subsets, cairo_scaled_font_reference (scaled_font), subsets->num_sub_fonts, max_glyphs, subset_glyph->is_scaled, subset_glyph->is_composite, &sub_font); if (unlikely (status)) { cairo_scaled_font_destroy (scaled_font); return status; } status = _cairo_hash_table_insert (subsets->scaled_sub_fonts, &sub_font->base); if (unlikely (status)) { _cairo_sub_font_destroy (sub_font); return status; } if (!subsets->scaled_sub_fonts_list) subsets->scaled_sub_fonts_list = sub_font; else subsets->scaled_sub_fonts_list_end->next = sub_font; subsets->scaled_sub_fonts_list_end = sub_font; subsets->num_sub_fonts++; } } return _cairo_sub_font_map_glyph (sub_font, scaled_font_glyph_index, utf8, utf8_len, subset_glyph); } static cairo_status_t _cairo_scaled_font_subsets_foreach_internal (cairo_scaled_font_subsets_t *font_subsets, cairo_scaled_font_subset_callback_func_t font_subset_callback, void *closure, cairo_subsets_foreach_type_t type) { cairo_sub_font_collection_t collection; cairo_sub_font_t *sub_font; cairo_bool_t is_scaled, is_user; is_scaled = FALSE; is_user = FALSE; if (type == CAIRO_SUBSETS_FOREACH_USER) is_user = TRUE; if (type == CAIRO_SUBSETS_FOREACH_SCALED || type == CAIRO_SUBSETS_FOREACH_USER) { is_scaled = TRUE; } if (is_scaled) collection.glyphs_size = font_subsets->max_glyphs_per_scaled_subset_used; else collection.glyphs_size = font_subsets->max_glyphs_per_unscaled_subset_used; if (! collection.glyphs_size) return CAIRO_STATUS_SUCCESS; collection.glyphs = _cairo_malloc_ab (collection.glyphs_size, sizeof(unsigned long)); collection.utf8 = _cairo_malloc_ab (collection.glyphs_size, sizeof(char *)); collection.to_latin_char = _cairo_malloc_ab (collection.glyphs_size, sizeof(int)); collection.latin_to_subset_glyph_index = _cairo_malloc_ab (256, sizeof(unsigned long)); if (unlikely (collection.glyphs == NULL || collection.utf8 == NULL || collection.to_latin_char == NULL || collection.latin_to_subset_glyph_index == NULL)) { free (collection.glyphs); free (collection.utf8); free (collection.to_latin_char); free (collection.latin_to_subset_glyph_index); return _cairo_error (CAIRO_STATUS_NO_MEMORY); } collection.font_subset_callback = font_subset_callback; collection.font_subset_callback_closure = closure; collection.status = CAIRO_STATUS_SUCCESS; if (is_scaled) sub_font = font_subsets->scaled_sub_fonts_list; else sub_font = font_subsets->unscaled_sub_fonts_list; while (sub_font) { if (sub_font->is_user == is_user) _cairo_sub_font_collect (sub_font, &collection); sub_font = sub_font->next; } free (collection.utf8); free (collection.glyphs); free (collection.to_latin_char); free (collection.latin_to_subset_glyph_index); return collection.status; } cairo_status_t _cairo_scaled_font_subsets_foreach_scaled (cairo_scaled_font_subsets_t *font_subsets, cairo_scaled_font_subset_callback_func_t font_subset_callback, void *closure) { return _cairo_scaled_font_subsets_foreach_internal (font_subsets, font_subset_callback, closure, CAIRO_SUBSETS_FOREACH_SCALED); } cairo_status_t _cairo_scaled_font_subsets_foreach_unscaled (cairo_scaled_font_subsets_t *font_subsets, cairo_scaled_font_subset_callback_func_t font_subset_callback, void *closure) { return _cairo_scaled_font_subsets_foreach_internal (font_subsets, font_subset_callback, closure, CAIRO_SUBSETS_FOREACH_UNSCALED); } cairo_status_t _cairo_scaled_font_subsets_foreach_user (cairo_scaled_font_subsets_t *font_subsets, cairo_scaled_font_subset_callback_func_t font_subset_callback, void *closure) { return _cairo_scaled_font_subsets_foreach_internal (font_subsets, font_subset_callback, closure, CAIRO_SUBSETS_FOREACH_USER); } static cairo_bool_t _cairo_string_equal (const void *key_a, const void *key_b) { const cairo_string_entry_t *a = key_a; const cairo_string_entry_t *b = key_b; if (strcmp (a->string, b->string) == 0) return TRUE; else return FALSE; } static void _cairo_string_init_key (cairo_string_entry_t *key, char *s) { unsigned long sum = 0; unsigned int i; for (i = 0; i < strlen(s); i++) sum += s[i]; key->base.hash = sum; key->string = s; } static cairo_status_t create_string_entry (char *s, cairo_string_entry_t **entry) { *entry = malloc (sizeof (cairo_string_entry_t)); if (unlikely (*entry == NULL)) return _cairo_error (CAIRO_STATUS_NO_MEMORY); _cairo_string_init_key (*entry, s); return CAIRO_STATUS_SUCCESS; } static void _pluck_entry (void *entry, void *closure) { _cairo_hash_table_remove (closure, entry); free (entry); } cairo_int_status_t _cairo_scaled_font_subset_create_glyph_names (cairo_scaled_font_subset_t *subset) { unsigned int i; cairo_hash_table_t *names; cairo_string_entry_t key, *entry; char buf[30]; char *utf8; uint16_t *utf16; int utf16_len; cairo_status_t status = CAIRO_STATUS_SUCCESS; names = _cairo_hash_table_create (_cairo_string_equal); if (unlikely (names == NULL)) return _cairo_error (CAIRO_STATUS_NO_MEMORY); subset->glyph_names = calloc (subset->num_glyphs, sizeof (char *)); if (unlikely (subset->glyph_names == NULL)) { status = _cairo_error (CAIRO_STATUS_NO_MEMORY); goto CLEANUP_HASH; } i = 0; if (! subset->is_scaled) { subset->glyph_names[0] = strdup (".notdef"); if (unlikely (subset->glyph_names[0] == NULL)) { status = _cairo_error (CAIRO_STATUS_NO_MEMORY); goto CLEANUP_HASH; } status = create_string_entry (subset->glyph_names[0], &entry); if (unlikely (status)) goto CLEANUP_HASH; status = _cairo_hash_table_insert (names, &entry->base); if (unlikely (status)) { free (entry); goto CLEANUP_HASH; } i++; } for (; i < subset->num_glyphs; i++) { utf8 = subset->utf8[i]; utf16 = NULL; utf16_len = 0; if (utf8 && *utf8) { status = _cairo_utf8_to_utf16 (utf8, -1, &utf16, &utf16_len); if (unlikely (status)) goto CLEANUP_HASH; } if (utf16_len == 1) { int ch = _cairo_unicode_to_winansi (utf16[0]); if (ch > 0 && _cairo_winansi_to_glyphname (ch)) strncpy (buf, _cairo_winansi_to_glyphname (ch), sizeof (buf)); else snprintf (buf, sizeof (buf), "uni%04X", (int) utf16[0]); _cairo_string_init_key (&key, buf); entry = _cairo_hash_table_lookup (names, &key.base); if (entry != NULL) snprintf (buf, sizeof (buf), "g%d", i); } else { snprintf (buf, sizeof (buf), "g%d", i); } free (utf16); subset->glyph_names[i] = strdup (buf); if (unlikely (subset->glyph_names[i] == NULL)) { status = _cairo_error (CAIRO_STATUS_NO_MEMORY); goto CLEANUP_HASH; } status = create_string_entry (subset->glyph_names[i], &entry); if (unlikely (status)) goto CLEANUP_HASH; status = _cairo_hash_table_insert (names, &entry->base); if (unlikely (status)) { free (entry); goto CLEANUP_HASH; } } CLEANUP_HASH: _cairo_hash_table_foreach (names, _pluck_entry, names); _cairo_hash_table_destroy (names); if (likely (status == CAIRO_STATUS_SUCCESS)) return CAIRO_STATUS_SUCCESS; if (subset->glyph_names != NULL) { for (i = 0; i < subset->num_glyphs; i++) { free (subset->glyph_names[i]); } free (subset->glyph_names); subset->glyph_names = NULL; } return status; } cairo_int_status_t _cairo_escape_ps_name (char **ps_name) { cairo_status_t status = CAIRO_STATUS_SUCCESS; /* Ensure PS name is a valid PDF/PS name object. In PDF names are * treated as UTF8 and non ASCII bytes, ' ', and '#' are encoded * as '#' followed by 2 hex digits that encode the byte. By also * encoding the characters in the reserved string we ensure the * name is also PS compatible. */ if (*ps_name) { static const char *reserved = "()<>[]{}/%#\\"; char buf[128]; /* max name length is 127 bytes */ char *src = *ps_name; char *dst = buf; while (*src && dst < buf + 127) { unsigned char c = *src; if (c < 0x21 || c > 0x7e || strchr (reserved, c)) { if (dst + 4 > buf + 127) break; snprintf (dst, 4, "#%02X", c); src++; dst += 3; } else { *dst++ = *src++; } } *dst = 0; free (*ps_name); *ps_name = strdup (buf); if (*ps_name == NULL) { status = _cairo_error (CAIRO_STATUS_NO_MEMORY); } } return status; } #endif /* CAIRO_HAS_FONT_SUBSET */