/* cairo - a vector graphics library with display and print output * * Copyright © 2006 Adrian Johnson * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 Adrian Johnson. * * Contributor(s): * Adrian Johnson */ #include "cairoint.h" #include "cairo-scaled-font-subsets-private.h" #include "cairo-truetype-subset-private.h" /* CFF Dict Operators. If the high byte is 0 the command is encoded * with a single byte. */ #define BASEFONTNAME_OP 0x0c16 #define CHARSET_OP 0x000f #define CHARSTRINGS_OP 0x0011 #define COPYRIGHT_OP 0x0c00 #define ENCODING_OP 0x0010 #define FAMILYNAME_OP 0x0003 #define FONTNAME_OP 0x0c26 #define FULLNAME_OP 0x0002 #define LOCAL_SUB_OP 0x0013 #define NOTICE_OP 0x0001 #define POSTSCRIPT_OP 0x0c15 #define PRIVATE_OP 0x0012 #define ROS_OP 0x0c1e #define VERSION_OP 0x0000 #define WEIGHT_OP 0x0004 #define NUM_STD_STRINGS 391 #define ARRAY_LENGTH(a) ( (sizeof (a)) / (sizeof ((a)[0])) ) typedef struct _cff_header { uint8_t major; uint8_t minor; uint8_t header_size; uint8_t offset_size; } cff_header_t; typedef struct _cff_index_element { cairo_bool_t is_copy; unsigned char *data; int length; } cff_index_element_t; typedef struct _cff_dict_operator { cairo_hash_entry_t base; unsigned short operator; unsigned char *operand; int operand_length; int operand_offset; } cff_dict_operator_t; typedef struct _cairo_cff_font { cairo_scaled_font_subset_t *scaled_font_subset; const cairo_scaled_font_backend_t *backend; /* Font Data */ unsigned char *data; unsigned long data_length; unsigned char *current_ptr; unsigned char *data_end; cff_header_t *header; char *font_name; cairo_hash_table_t *top_dict; cairo_hash_table_t *private_dict; cairo_array_t strings_index; cairo_array_t charstrings_index; cairo_array_t global_sub_index; cairo_array_t local_sub_index; int num_glyphs; /* Subsetted Font Data */ char *subset_font_name; cairo_array_t charstrings_subset_index; cairo_array_t strings_subset_index; cairo_array_t output; /* Subset Metrics */ int *widths; int x_min, y_min, x_max, y_max; int ascent, descent; } cairo_cff_font_t; #ifdef WORDS_BIGENDIAN #define cpu_to_be16(v) (v) #define be16_to_cpu(v) (v) #define cpu_to_be32(v) (v) #else static inline uint16_t cpu_to_be16(uint16_t v) { return (v << 8) | (v >> 8); } static inline uint16_t be16_to_cpu(uint16_t v) { return cpu_to_be16 (v); } static inline uint32_t cpu_to_be32(uint32_t v) { return (cpu_to_be16 (v) << 16) | cpu_to_be16 (v >> 16); } #endif /* Encoded integer using maximum sized encoding. This is required for * operands that are later modified after encoding. */ static unsigned char * encode_integer_max (unsigned char *p, int i) { *p++ = 29; *p++ = i >> 24; *p++ = (i >> 16) & 0xff; *p++ = (i >> 8) & 0xff; *p++ = i & 0xff; return p; } static unsigned char * encode_integer (unsigned char *p, int i) { if (i >= -107 && i <= 107) { *p++ = i + 139; } else if (i >= 108 && i <= 1131) { i -= 108; *p++ = (i >> 8)+ 247; *p++ = i & 0xff; } else if (i >= -1131 && i <= -108) { i = -i - 108; *p++ = (i >> 8)+ 251; *p++ = i & 0xff; } else if (i >= -1131 && i <= -108) { *p++ = 28; *p++ = (i >> 8) & 0xff; *p++ = i & 0xff; } else { p = encode_integer_max (p, i); } return p; } static unsigned char * decode_integer (unsigned char *p, int *integer) { if (*p == 28) { *integer = (int)(p[1]<<8 | p[2]); p += 3; } else if (*p == 29) { *integer = (int)((p[1] << 24) | (p[2] << 16) | (p[3] << 8) | p[4]); p += 5; } else if (*p >= 32 && *p <= 246) { *integer = *p++ - 139; } else if (*p <= 250) { *integer = (p[0] - 247) * 256 + p[1] + 108; p += 2; } else if (*p <= 254) { *integer = -(p[0] - 251) * 256 - p[1] - 108; p += 2; } else { *integer = 0; p += 1; } return p; } static unsigned char * decode_operator (unsigned char *p, unsigned short *operator) { unsigned short op = 0; op = *p++; if (op == 12) { op <<= 8; op |= *p++; } *operator = op; return p; } /* return 0 if not an operand */ static int operand_length (unsigned char *p) { unsigned char *begin = p; if (*p == 28) return 3; if (*p == 29) return 5; if (*p >= 32 && *p <= 246) return 1; if (*p >= 247 && *p <= 254) return 2; if (*p == 30) { while ((*p & 0x0f) != 0x0f) p++; return p - begin + 1; } return 0; } static unsigned char * encode_index_offset (unsigned char *p, int offset_size, unsigned long offset) { while (--offset_size >= 0) { p[offset_size] = (unsigned char) (offset & 0xff); offset >>= 8; } return p + offset_size; } static unsigned long decode_index_offset(unsigned char *p, int off_size) { unsigned long offset = 0; while (off_size-- > 0) offset = offset*256 + *p++; return offset; } static void cff_index_init (cairo_array_t *index) { _cairo_array_init (index, sizeof (cff_index_element_t)); } static cairo_int_status_t cff_index_read (cairo_array_t *index, unsigned char **ptr, unsigned char *end_ptr) { cff_index_element_t element; unsigned char *data, *p; cairo_status_t status; int offset_size, count, start, i; int end = 0; p = *ptr; if (p + 2 > end_ptr) return CAIRO_INT_STATUS_UNSUPPORTED; count = be16_to_cpu( *((uint16_t *)p) ); p += 2; if (count > 0) { offset_size = *p++; if (p + (count + 1)*offset_size > end_ptr) return CAIRO_INT_STATUS_UNSUPPORTED; data = p + offset_size*(count + 1) - 1; start = decode_index_offset (p, offset_size); p += offset_size; for (i = 0; i < count; i++) { end = decode_index_offset (p, offset_size); p += offset_size; if (p > end_ptr) return CAIRO_INT_STATUS_UNSUPPORTED; element.length = end - start; element.is_copy = FALSE; element.data = data + start; status = _cairo_array_append (index, &element); if (status) return status; start = end; } p = data + end; } *ptr = p; return CAIRO_STATUS_SUCCESS; } static cairo_status_t cff_index_write (cairo_array_t *index, cairo_array_t *output) { int offset_size; int offset; int num_elem; int i; cff_index_element_t *element; uint16_t count; unsigned char buf[5]; cairo_status_t status; num_elem = _cairo_array_num_elements (index); count = cpu_to_be16 ((uint16_t) num_elem); status = _cairo_array_append_multiple (output, &count, 2); if (status) return status; if (num_elem == 0) return CAIRO_STATUS_SUCCESS; /* Find maximum offset to determine offset size */ offset = 1; for (i = 0; i < num_elem; i++) { element = _cairo_array_index (index, i); offset += element->length; } if (offset < 0x100) offset_size = 1; else if (offset < 0x10000) offset_size = 2; else if (offset < 0x1000000) offset_size = 3; else offset_size = 4; buf[0] = (unsigned char) offset_size; status = _cairo_array_append (output, buf); if (status) return status; offset = 1; encode_index_offset (buf, offset_size, offset); status = _cairo_array_append_multiple (output, buf, offset_size); if (status) return status; for (i = 0; i < num_elem; i++) { element = _cairo_array_index (index, i); offset += element->length; encode_index_offset (buf, offset_size, offset); status = _cairo_array_append_multiple (output, buf, offset_size); if (status) return status; } for (i = 0; i < num_elem; i++) { element = _cairo_array_index (index, i); status = _cairo_array_append_multiple (output, element->data, element->length); if (status) return status; } return CAIRO_STATUS_SUCCESS; } static cairo_status_t cff_index_append (cairo_array_t *index, unsigned char *object , int length) { cff_index_element_t element; element.length = length; element.is_copy = FALSE; element.data = object; return _cairo_array_append (index, &element); } static cairo_status_t cff_index_append_copy (cairo_array_t *index, unsigned char *object , int length) { cff_index_element_t element; element.length = length; element.is_copy = TRUE; element.data = malloc (element.length); if (element.data == NULL) return CAIRO_STATUS_NO_MEMORY; memcpy (element.data, object, element.length); return _cairo_array_append (index, &element); } static void cff_index_fini (cairo_array_t *index) { cff_index_element_t *element; int i; for (i = 0; i < _cairo_array_num_elements (index); i++) { element = _cairo_array_index (index, i); if (element->is_copy) free (element->data); } _cairo_array_fini (index); } static cairo_bool_t _cairo_cff_dict_equal (const void *key_a, const void *key_b) { const cff_dict_operator_t *op_a = key_a; const cff_dict_operator_t *op_b = key_b; return op_a->operator == op_b->operator; } static void cff_dict_init (cairo_hash_table_t **dict) { *dict = _cairo_hash_table_create (_cairo_cff_dict_equal); } static void _cairo_dict_init_key (cff_dict_operator_t *key, int operator) { key->base.hash = (unsigned long) operator; key->operator = operator; } static cff_dict_operator_t * cff_dict_create_operator (int operator, unsigned char *operand, int operand_length) { cff_dict_operator_t *op; op = malloc (sizeof (cff_dict_operator_t)); if (op == NULL) return NULL; _cairo_dict_init_key (op, operator); op->operand = malloc (operand_length); if (op->operand == NULL) { free (op); return NULL; } memcpy (op->operand, operand, operand_length); op->operand_length = operand_length; op->operand_offset = -1; return op; } static cairo_status_t cff_dict_read (cairo_hash_table_t *dict, unsigned char *p, int dict_size) { unsigned char *end; cairo_array_t operands; cff_dict_operator_t *op; unsigned short operator; cairo_status_t status = CAIRO_STATUS_SUCCESS; int size; end = p + dict_size; _cairo_array_init (&operands, 1); while (p < end) { size = operand_length (p); if (size != 0) { status = _cairo_array_append_multiple (&operands, p, size); if (status) goto fail; p += size; } else { p = decode_operator (p, &operator); op = cff_dict_create_operator (operator, _cairo_array_index (&operands, 0), _cairo_array_num_elements (&operands)); if (op == NULL) { status = CAIRO_STATUS_NO_MEMORY; goto fail; } status = _cairo_hash_table_insert (dict, &op->base); if (status) goto fail; _cairo_array_truncate (&operands, 0); } } fail: _cairo_array_fini (&operands); return status; } static void cff_dict_remove (cairo_hash_table_t *dict, unsigned short operator) { cff_dict_operator_t key, *op; _cairo_dict_init_key (&key, operator); if (_cairo_hash_table_lookup (dict, &key.base, (cairo_hash_entry_t **) &op)) { free (op->operand); _cairo_hash_table_remove (dict, (cairo_hash_entry_t *) op); } } static unsigned char * cff_dict_get_operands (cairo_hash_table_t *dict, unsigned short operator, int *size) { cff_dict_operator_t key, *op; _cairo_dict_init_key (&key, operator); if (_cairo_hash_table_lookup (dict, &key.base, (cairo_hash_entry_t **) &op)) { *size = op->operand_length; return op->operand; } return NULL; } static cairo_status_t cff_dict_set_operands (cairo_hash_table_t *dict, unsigned short operator, unsigned char *operand, int size) { cff_dict_operator_t key, *op; cairo_status_t status; _cairo_dict_init_key (&key, operator); if (_cairo_hash_table_lookup (dict, &key.base, (cairo_hash_entry_t **) &op)) { free (op->operand); op->operand = malloc (size); if (op->operand == NULL) return CAIRO_STATUS_NO_MEMORY; memcpy (op->operand, operand, size); op->operand_length = size; } else { op = cff_dict_create_operator (operator, operand, size); if (op == NULL) return CAIRO_STATUS_NO_MEMORY; status = _cairo_hash_table_insert (dict, &op->base); if (status) return status; } return CAIRO_STATUS_SUCCESS; } static int cff_dict_get_location (cairo_hash_table_t *dict, unsigned short operator, int *size) { cff_dict_operator_t key, *op; _cairo_dict_init_key (&key, operator); if (_cairo_hash_table_lookup (dict, &key.base, (cairo_hash_entry_t **) &op)) { *size = op->operand_length; return op->operand_offset; } return -1; } typedef struct _dict_write_info { cairo_array_t *output; cairo_status_t status; } dict_write_info_t; static void _cairo_dict_collect (void *entry, void *closure) { dict_write_info_t *write_info = closure; cff_dict_operator_t *op = entry; unsigned char data; if (write_info->status) return; op->operand_offset = _cairo_array_num_elements (write_info->output); write_info->status = _cairo_array_append_multiple (write_info->output, op->operand, op->operand_length); if (write_info->status) return; if (op->operator & 0xff00) { data = op->operator >> 8; write_info->status = _cairo_array_append (write_info->output, &data); if (write_info->status) return; } data = op->operator & 0xff; write_info->status = _cairo_array_append (write_info->output, &data); } static cairo_status_t cff_dict_write (cairo_hash_table_t *dict, cairo_array_t *output) { dict_write_info_t write_info; write_info.output = output; write_info.status = CAIRO_STATUS_SUCCESS; _cairo_hash_table_foreach (dict, _cairo_dict_collect, &write_info); return write_info.status; } static void cff_dict_fini (cairo_hash_table_t *dict) { cff_dict_operator_t *entry; while (1) { entry = _cairo_hash_table_random_entry (dict, NULL); if (entry == NULL) break; free (entry->operand); _cairo_hash_table_remove (dict, (cairo_hash_entry_t *) entry); free (entry); } _cairo_hash_table_destroy (dict); } static cairo_int_status_t cairo_cff_font_read_header (cairo_cff_font_t *font) { if (font->data_length < sizeof (cff_header_t)) return CAIRO_INT_STATUS_UNSUPPORTED; font->header = (cff_header_t *) font->data; font->current_ptr = font->data + font->header->header_size; return CAIRO_STATUS_SUCCESS; } static cairo_int_status_t cairo_cff_font_read_name (cairo_cff_font_t *font) { cairo_array_t index; cairo_int_status_t status; /* The original font name is not used in the subset. Read the name * index to skip over it. */ cff_index_init (&index); status = cff_index_read (&index, &font->current_ptr, font->data_end); cff_index_fini (&index); return status; } static cairo_int_status_t cairo_cff_font_read_private_dict (cairo_cff_font_t *font, unsigned char *ptr, int size) { unsigned char buf[10]; unsigned char *end_buf; int offset; int i; unsigned char *operand; unsigned char *p; cff_dict_read (font->private_dict, ptr, size); operand = cff_dict_get_operands (font->private_dict, LOCAL_SUB_OP, &i); if (operand) { decode_integer (operand, &offset); p = ptr + offset; cff_index_read (&font->local_sub_index, &p, font->data_end); /* Use maximum sized encoding to reserve space for later modification. */ end_buf = encode_integer_max (buf, 0); cff_dict_set_operands (font->private_dict, LOCAL_SUB_OP, buf, end_buf - buf); } return CAIRO_STATUS_SUCCESS; } static cairo_int_status_t cairo_cff_font_read_top_dict (cairo_cff_font_t *font) { cairo_array_t index; cff_index_element_t *element; unsigned char buf[20]; unsigned char *end_buf; unsigned char *operand; cairo_int_status_t status; unsigned char *p; int size; int offset; cff_index_init (&index); status = cff_index_read (&index, &font->current_ptr, font->data_end); if (status) goto fail; element = _cairo_array_index (&index, 0); cff_dict_read (font->top_dict, element->data, element->length); /* CID fonts are NYI */ if (cff_dict_get_operands (font->top_dict, ROS_OP, &size) != NULL) { status = CAIRO_INT_STATUS_UNSUPPORTED; goto fail; } operand = cff_dict_get_operands (font->top_dict, CHARSTRINGS_OP, &size); decode_integer (operand, &offset); p = font->data + offset; status = cff_index_read (&font->charstrings_index, &p, font->data_end); if (status) goto fail; font->num_glyphs = _cairo_array_num_elements (&font->charstrings_index); operand = cff_dict_get_operands (font->top_dict, PRIVATE_OP, &size); operand = decode_integer (operand, &size); decode_integer (operand, &offset); cairo_cff_font_read_private_dict (font, font->data + offset, size); cff_dict_remove (font->top_dict, CHARSET_OP); /* Use maximum sized encoding to reserve space for later modification. */ end_buf = encode_integer_max (buf, 0); cff_dict_set_operands (font->top_dict, CHARSTRINGS_OP, buf, end_buf - buf); cff_dict_set_operands (font->top_dict, ENCODING_OP, buf, end_buf - buf); /* Private has two operands - size and offset */ end_buf = encode_integer_max (end_buf, 0); cff_dict_set_operands (font->top_dict, PRIVATE_OP, buf, end_buf - buf); fail: cff_index_fini (&index); return status; } static cairo_int_status_t cairo_cff_font_read_strings (cairo_cff_font_t *font) { return cff_index_read (&font->strings_index, &font->current_ptr, font->data_end); } static cairo_int_status_t cairo_cff_font_read_global_subroutines (cairo_cff_font_t *font) { return cff_index_read (&font->global_sub_index, &font->current_ptr, font->data_end); } typedef cairo_int_status_t (*font_read_t) (cairo_cff_font_t *font); static const font_read_t font_read_funcs[] = { cairo_cff_font_read_header, cairo_cff_font_read_name, cairo_cff_font_read_top_dict, cairo_cff_font_read_strings, cairo_cff_font_read_global_subroutines, }; static cairo_int_status_t cairo_cff_font_read_font (cairo_cff_font_t *font) { cairo_int_status_t status; unsigned int i; for (i = 0; i < ARRAY_LENGTH (font_read_funcs); i++) { status = font_read_funcs[i] (font); if (status) return status; } return CAIRO_STATUS_SUCCESS; } static cairo_status_t cairo_cff_font_subset_dict_string(cairo_cff_font_t *font, cairo_hash_table_t *dict, int operator) { int size; unsigned char *p; int sid; unsigned char buf[100]; cff_index_element_t *element; cairo_status_t status; p = cff_dict_get_operands (dict, operator, &size); if (!p) return CAIRO_STATUS_SUCCESS; decode_integer (p, &sid); if (sid < NUM_STD_STRINGS) return CAIRO_STATUS_SUCCESS; element = _cairo_array_index (&font->strings_index, sid - NUM_STD_STRINGS); sid = NUM_STD_STRINGS + _cairo_array_num_elements (&font->strings_subset_index); status = cff_index_append (&font->strings_subset_index, element->data, element->length); if (status) return status; p = encode_integer (buf, sid); cff_dict_set_operands (dict, operator, buf, p - buf); return CAIRO_STATUS_SUCCESS; } static const int dict_strings[] = { VERSION_OP, NOTICE_OP, COPYRIGHT_OP, FULLNAME_OP, FAMILYNAME_OP, WEIGHT_OP, POSTSCRIPT_OP, BASEFONTNAME_OP, FONTNAME_OP, }; static cairo_status_t cairo_cff_font_subset_dict_strings (cairo_cff_font_t *font, cairo_hash_table_t *dict) { cairo_status_t status; unsigned int i; for (i = 0; i < ARRAY_LENGTH (dict_strings); i++) { status = cairo_cff_font_subset_dict_string (font, dict, dict_strings[i]); if (status) return status; } return CAIRO_STATUS_SUCCESS; } static cairo_status_t cairo_cff_font_subset_strings (cairo_cff_font_t *font) { cairo_status_t status; status = cairo_cff_font_subset_dict_strings (font, font->top_dict); if (status) return status; status = cairo_cff_font_subset_dict_strings (font, font->private_dict); return status; } static cairo_status_t cairo_cff_font_subset_charstrings (cairo_cff_font_t *font) { cff_index_element_t *element; unsigned int i; cairo_status_t status; /* add .notdef */ element = _cairo_array_index (&font->charstrings_index, 0); status = cff_index_append (&font->charstrings_subset_index, element->data, element->length); if (status) return status; for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { element = _cairo_array_index (&font->charstrings_index, font->scaled_font_subset->glyphs[i]); status = cff_index_append (&font->charstrings_subset_index, element->data, element->length); if (status) return status; } return CAIRO_STATUS_SUCCESS; } static cairo_status_t cairo_cff_font_subset_font (cairo_cff_font_t *font) { cairo_status_t status; /* TODO: subset subroutines */ status = cairo_cff_font_subset_strings (font); if (status) return status; status = cairo_cff_font_subset_charstrings (font); return status; } /* Set the operand of the specified operator in the (already written) * top dict to point to the current position in the output * array. Operands updated with this function must have previously * been encoded with the 5-byte (max) integer encoding. */ static void cairo_cff_font_set_topdict_operator_to_cur_pos (cairo_cff_font_t *font, int operator) { int cur_pos; int offset; int size; unsigned char buf[10]; unsigned char *buf_end; unsigned char *op_ptr; cur_pos = _cairo_array_num_elements (&font->output); buf_end = encode_integer_max (buf, cur_pos); offset = cff_dict_get_location (font->top_dict, operator, &size); assert (offset > 0); op_ptr = _cairo_array_index (&font->output, offset); memcpy (op_ptr, buf, buf_end - buf); } static cairo_status_t cairo_cff_font_write_header (cairo_cff_font_t *font) { return _cairo_array_append_multiple (&font->output, font->header, font->header->header_size); } static cairo_status_t cairo_cff_font_write_name (cairo_cff_font_t *font) { cairo_array_t index; cairo_status_t status; cff_index_init (&index); status = cff_index_append_copy (&index, (unsigned char *) font->subset_font_name, strlen(font->subset_font_name)); if (status) return status; status = cff_index_write (&index, &font->output); if (status) return status; cff_index_fini (&index); return CAIRO_STATUS_SUCCESS; } static cairo_status_t cairo_cff_font_write_top_dict (cairo_cff_font_t *font) { uint16_t count; unsigned char buf[10]; unsigned char *p; int offset_index; int dict_start, dict_size; int offset_size = 4; cairo_status_t status; /* Write an index containing the top dict */ count = cpu_to_be16 (1); status = _cairo_array_append_multiple (&font->output, &count, 2); if (status) return status; buf[0] = offset_size; status = _cairo_array_append (&font->output, buf); if (status) return status; encode_index_offset (buf, offset_size, 1); status = _cairo_array_append_multiple (&font->output, buf, offset_size); if (status) return status; /* Reserve space for last element of offset array and update after * dict is written */ offset_index = _cairo_array_num_elements (&font->output); status = _cairo_array_append_multiple (&font->output, buf, offset_size); if (status) return status; dict_start = _cairo_array_num_elements (&font->output); status = cff_dict_write (font->top_dict, &font->output); if (status) return status; dict_size = _cairo_array_num_elements (&font->output) - dict_start; encode_index_offset (buf, offset_size, dict_size + 1); p = _cairo_array_index (&font->output, offset_index); memcpy (p, buf, offset_size); return CAIRO_STATUS_SUCCESS; } static cairo_status_t cairo_cff_font_write_strings (cairo_cff_font_t *font) { return cff_index_write (&font->strings_subset_index, &font->output); } static cairo_status_t cairo_cff_font_write_global_subrs (cairo_cff_font_t *font) { return cff_index_write (&font->global_sub_index, &font->output); } static cairo_status_t cairo_cff_font_write_encoding (cairo_cff_font_t *font) { unsigned char buf[10]; cairo_cff_font_set_topdict_operator_to_cur_pos (font, ENCODING_OP); buf[0] = 1; /* Format 1 */ buf[1] = 1; /* Number of ranges */ buf[2] = 0; /* First code in range */ /* Codes left in range excluding first */ buf[3] = font->scaled_font_subset->num_glyphs - 1; return _cairo_array_append_multiple (&font->output, buf, 4); } static cairo_status_t cairo_cff_font_write_charstrings (cairo_cff_font_t *font) { cairo_cff_font_set_topdict_operator_to_cur_pos (font, CHARSTRINGS_OP); return cff_index_write (&font->charstrings_subset_index, &font->output); } static cairo_status_t cairo_cff_font_write_private_dict_and_local_sub (cairo_cff_font_t *font) { int offset, private_dict_offset; int size; unsigned char buf[10]; unsigned char *buf_end; unsigned char *p; cairo_status_t status; /* Write private dict and update offset and size in top dict */ private_dict_offset = _cairo_array_num_elements (&font->output); status = cff_dict_write (font->private_dict, &font->output); if (status) return status; size = _cairo_array_num_elements (&font->output) - private_dict_offset; /* private entry has two operands - size and offset */ buf_end = encode_integer_max (buf, size); buf_end = encode_integer_max (buf_end, private_dict_offset); offset = cff_dict_get_location (font->top_dict, PRIVATE_OP, &size); assert (offset > 0); p = _cairo_array_index (&font->output, offset); memcpy (p, buf, buf_end - buf); if (_cairo_array_num_elements (&font->local_sub_index) > 0) { /* Write local subroutines and update offset in private * dict. Local subroutines offset is relative to start of * private dict */ offset = _cairo_array_num_elements (&font->output) - private_dict_offset; buf_end = encode_integer_max (buf, offset); offset = cff_dict_get_location (font->private_dict, LOCAL_SUB_OP, &size); assert (offset > 0); p = _cairo_array_index (&font->output, offset); memcpy (p, buf, buf_end - buf); status = cff_index_write (&font->local_sub_index, &font->output); if (status) return status; } return CAIRO_STATUS_SUCCESS; } typedef cairo_status_t (*font_write_t) (cairo_cff_font_t *font); static const font_write_t font_write_funcs[] = { cairo_cff_font_write_header, cairo_cff_font_write_name, cairo_cff_font_write_top_dict, cairo_cff_font_write_strings, cairo_cff_font_write_global_subrs, cairo_cff_font_write_encoding, cairo_cff_font_write_charstrings, cairo_cff_font_write_private_dict_and_local_sub, }; static cairo_status_t cairo_cff_font_write_subset (cairo_cff_font_t *font) { cairo_int_status_t status; unsigned int i; for (i = 0; i < ARRAY_LENGTH (font_write_funcs); i++) { status = font_write_funcs[i] (font); if (status) return status; } return CAIRO_STATUS_SUCCESS; } static cairo_int_status_t cairo_cff_font_generate (cairo_cff_font_t *font, const char **data, unsigned long *length) { cairo_int_status_t status; status = cairo_cff_font_read_font (font); if (status) return status; status = cairo_cff_font_subset_font (font); if (status) return status; status = cairo_cff_font_write_subset (font); if (status) return status; *data = _cairo_array_index (&font->output, 0); *length = _cairo_array_num_elements (&font->output); return CAIRO_STATUS_SUCCESS; } static cairo_int_status_t cairo_cff_font_create_set_widths (cairo_cff_font_t *font) { unsigned long size; unsigned long long_entry_size; unsigned long short_entry_size; unsigned int i; tt_hhea_t hhea; int num_hmetrics; unsigned char buf[10]; int glyph_index; cairo_int_status_t status; size = sizeof (tt_hhea_t); status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, TT_TAG_hhea, 0, (unsigned char*) &hhea, &size); if (status) return status; num_hmetrics = be16_to_cpu (hhea.num_hmetrics); for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { glyph_index = font->scaled_font_subset->glyphs[i]; long_entry_size = 2 * sizeof (int16_t); short_entry_size = sizeof (int16_t); if (glyph_index < num_hmetrics) { status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, TT_TAG_hmtx, glyph_index * long_entry_size, buf, &short_entry_size); if (status) return status; } else { status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, TT_TAG_hmtx, (num_hmetrics - 1) * long_entry_size, buf, &short_entry_size); if (status) return status; } font->widths[i] = be16_to_cpu (*((int16_t*)buf)); } return CAIRO_STATUS_SUCCESS; } static cairo_int_status_t _cairo_cff_font_create (cairo_scaled_font_subset_t *scaled_font_subset, cairo_cff_font_t **font_return, const char *subset_name) { const cairo_scaled_font_backend_t *backend; cairo_status_t status; cairo_cff_font_t *font; tt_head_t head; tt_hhea_t hhea; tt_name_t *name; tt_name_record_t *record; unsigned long size, data_length; int i, j; backend = scaled_font_subset->scaled_font->backend; if (!backend->load_truetype_table) return CAIRO_INT_STATUS_UNSUPPORTED; data_length = 0; status = backend->load_truetype_table( scaled_font_subset->scaled_font, TT_TAG_CFF, 0, NULL, &data_length); if (status) return status; size = sizeof (tt_head_t); status = backend->load_truetype_table (scaled_font_subset->scaled_font, TT_TAG_head, 0, (unsigned char *) &head, &size); if (status) return status; size = sizeof (tt_hhea_t); status = backend->load_truetype_table (scaled_font_subset->scaled_font, TT_TAG_hhea, 0, (unsigned char *) &hhea, &size); if (status) return status; size = 0; status = backend->load_truetype_table (scaled_font_subset->scaled_font, TT_TAG_hmtx, 0, NULL, &size); if (status) return status; size = 0; status = backend->load_truetype_table (scaled_font_subset->scaled_font, TT_TAG_name, 0, NULL, &size); if (status) return status; name = malloc (size); if (name == NULL) return CAIRO_STATUS_NO_MEMORY; status = backend->load_truetype_table (scaled_font_subset->scaled_font, TT_TAG_name, 0, (unsigned char *) name, &size); if (status) goto fail1; font = malloc (sizeof (cairo_cff_font_t)); if (font == NULL) { status = CAIRO_STATUS_NO_MEMORY; goto fail1; } font->backend = backend; font->scaled_font_subset = scaled_font_subset; _cairo_array_init (&font->output, sizeof (char)); status = _cairo_array_grow_by (&font->output, 4096); if (status) goto fail2; font->subset_font_name = strdup (subset_name); if (font->subset_font_name == NULL) { status = CAIRO_STATUS_NO_MEMORY; goto fail3; } font->x_min = (int16_t) be16_to_cpu (head.x_min); font->y_min = (int16_t) be16_to_cpu (head.y_min); font->x_max = (int16_t) be16_to_cpu (head.x_max); font->y_max = (int16_t) be16_to_cpu (head.y_max); font->ascent = (int16_t) be16_to_cpu (hhea.ascender); font->descent = (int16_t) be16_to_cpu (hhea.descender); /* Extract the font name from the name table. At present this * just looks for the Mac platform/Roman encoded font name. It * should be extended to use any suitable font name in the * name table. If the mac/roman font name is not found a * CairoFont-x-y name is created. */ font->font_name = NULL; for (i = 0; i < be16_to_cpu(name->num_records); i++) { record = &(name->records[i]); if ((be16_to_cpu (record->platform) == 1) && (be16_to_cpu (record->encoding) == 0) && (be16_to_cpu (record->name) == 4)) { font->font_name = malloc (be16_to_cpu(record->length) + 1); if (font->font_name) { strncpy(font->font_name, ((char*)name) + be16_to_cpu (name->strings_offset) + be16_to_cpu (record->offset), be16_to_cpu (record->length)); font->font_name[be16_to_cpu (record->length)] = 0; } break; } } if (font->font_name == NULL) { font->font_name = malloc (30); if (font->font_name == NULL) { status = CAIRO_STATUS_NO_MEMORY; goto fail4; } snprintf(font->font_name, 30, "CairoFont-%u-%u", scaled_font_subset->font_id, scaled_font_subset->subset_id); } for (i = 0, j = 0; font->font_name[j]; j++) { if (font->font_name[j] == ' ') continue; font->font_name[i++] = font->font_name[j]; } font->font_name[i] = '\0'; font->widths = calloc (font->scaled_font_subset->num_glyphs, sizeof (int)); if (font->widths == NULL) { status = CAIRO_STATUS_NO_MEMORY; goto fail5; } cairo_cff_font_create_set_widths (font); font->data_length = data_length; font->data = malloc (data_length); if (font->data == NULL) { status = CAIRO_STATUS_NO_MEMORY; goto fail6; } status = font->backend->load_truetype_table ( font->scaled_font_subset->scaled_font, TT_TAG_CFF, 0, font->data, &font->data_length); if (status) goto fail7; font->data_end = font->data + font->data_length; cff_dict_init (&font->top_dict); cff_dict_init (&font->private_dict); cff_index_init (&font->strings_index); cff_index_init (&font->charstrings_index); cff_index_init (&font->global_sub_index); cff_index_init (&font->local_sub_index); cff_index_init (&font->charstrings_subset_index); cff_index_init (&font->strings_subset_index); free (name); *font_return = font; return CAIRO_STATUS_SUCCESS; fail7: free (font->data); fail6: free (font->widths); fail5: free (font->font_name); fail4: free (font->subset_font_name); fail3: _cairo_array_fini (&font->output); fail2: free (font); fail1: free (name); return status; } static void cairo_cff_font_destroy (cairo_cff_font_t *font) { free (font->widths); free (font->font_name); free (font->subset_font_name); _cairo_array_fini (&font->output); cff_dict_fini (font->top_dict); cff_dict_fini (font->private_dict); cff_index_fini (&font->strings_index); cff_index_fini (&font->charstrings_index); cff_index_fini (&font->global_sub_index); cff_index_fini (&font->local_sub_index); cff_index_fini (&font->charstrings_subset_index); cff_index_fini (&font->strings_subset_index); free (font); } cairo_status_t _cairo_cff_subset_init (cairo_cff_subset_t *cff_subset, const char *subset_name, cairo_scaled_font_subset_t *font_subset) { cairo_cff_font_t *font = NULL; /* squelch bogus compiler warning */ cairo_status_t status; const char *data = NULL; /* squelch bogus compiler warning */ unsigned long length = 0; /* squelch bogus compiler warning */ unsigned int i; status = _cairo_cff_font_create (font_subset, &font, subset_name); if (status) return status; status = cairo_cff_font_generate (font, &data, &length); if (status) goto fail1; cff_subset->base_font = strdup (font->font_name); if (cff_subset->base_font == NULL) goto fail1; cff_subset->widths = calloc (sizeof (int), font->scaled_font_subset->num_glyphs); if (cff_subset->widths == NULL) goto fail2; for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) cff_subset->widths[i] = font->widths[i]; cff_subset->x_min = font->x_min; cff_subset->y_min = font->y_min; cff_subset->x_max = font->x_max; cff_subset->y_max = font->y_max; cff_subset->ascent = font->ascent; cff_subset->descent = font->descent; cff_subset->data = malloc (length); if (cff_subset->data == NULL) goto fail3; memcpy (cff_subset->data, data, length); cff_subset->data_length = length; cairo_cff_font_destroy (font); return CAIRO_STATUS_SUCCESS; fail3: free (cff_subset->widths); fail2: free (cff_subset->base_font); fail1: cairo_cff_font_destroy (font); return status; } void _cairo_cff_subset_fini (cairo_cff_subset_t *subset) { free (subset->base_font); free (subset->widths); free (subset->data); }