[cairo] {PATCH] OpenType/CFF Subsetting
Adrian Johnson
ajohnson at redneon.com
Wed Oct 25 07:25:45 PDT 2006
This patch adds support for subsetting of OpenType fonts with CFF
(PostScript) outlines.
-------------- next part --------------
diff --git a/src/Makefile.am b/src/Makefile.am
index f6ac7d0..71df10e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,4 +1,5 @@
font_subset_sources = \
+ cairo-cff-subset.c \
cairo-truetype-subset.c \
cairo-type1-fallback.c \
cairo-truetype-subset-private.h \
diff --git a/src/cairo-cff-subset.c b/src/cairo-cff-subset.c
new file mode 100755
index 0000000..f7378e6
--- /dev/null
+++ b/src/cairo-cff-subset.c
@@ -0,0 +1,1452 @@
+/* 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 <ajohnson at redneon.com>
+ */
+
+#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);
+}
diff --git a/src/cairo-pdf-surface.c b/src/cairo-pdf-surface.c
index 447ebdd..a42b944 100644
--- a/src/cairo-pdf-surface.c
+++ b/src/cairo-pdf-surface.c
@@ -1580,6 +1580,109 @@ _cairo_pdf_surface_write_pages (cairo_pd
}
static cairo_status_t
+_cairo_pdf_surface_emit_cff_font_subset (cairo_pdf_surface_t *surface,
+ cairo_scaled_font_subset_t *font_subset)
+{
+ cairo_pdf_resource_t stream, descriptor, subset_resource;
+ cairo_status_t status;
+ cairo_pdf_font_t font;
+ cairo_cff_subset_t subset;
+ unsigned long compressed_length;
+ char *compressed;
+ unsigned int i;
+ char name[64];
+
+ snprintf (name, sizeof name, "CairoFont-%d-%d",
+ font_subset->font_id, font_subset->subset_id);
+ status = _cairo_cff_subset_init (&subset, name, font_subset);
+ if (status)
+ return status;
+
+ compressed = compress_dup (subset.data, subset.data_length, &compressed_length);
+ if (compressed == NULL) {
+ _cairo_cff_subset_fini (&subset);
+ return CAIRO_STATUS_NO_MEMORY;
+ }
+
+ stream = _cairo_pdf_surface_new_object (surface);
+ _cairo_output_stream_printf (surface->output,
+ "%d 0 obj\r\n"
+ "<< /Filter /FlateDecode\r\n"
+ " /Length %lu\r\n"
+ " /Subtype /Type1C\r\n"
+ ">>\r\n"
+ "stream\r\n",
+ stream.id,
+ compressed_length);
+ _cairo_output_stream_write (surface->output, compressed, compressed_length);
+ _cairo_output_stream_printf (surface->output,
+ "\r\n"
+ "endstream\r\n"
+ "endobj\r\n");
+ free (compressed);
+
+ descriptor = _cairo_pdf_surface_new_object (surface);
+ _cairo_output_stream_printf (surface->output,
+ "%d 0 obj\r\n"
+ "<< /Type /FontDescriptor\r\n"
+ " /FontName /%s\r\n"
+ " /Flags 4\r\n"
+ " /FontBBox [ %ld %ld %ld %ld ]\r\n"
+ " /ItalicAngle 0\r\n"
+ " /Ascent %ld\r\n"
+ " /Descent %ld\r\n"
+ " /CapHeight 500\r\n"
+ " /StemV 80\r\n"
+ " /StemH 80\r\n"
+ " /FontFile3 %u 0 R\r\n"
+ ">>\r\n"
+ "endobj\r\n",
+ descriptor.id,
+ subset.base_font,
+ subset.x_min,
+ subset.y_min,
+ subset.x_max,
+ subset.y_max,
+ subset.ascent,
+ subset.descent,
+ stream.id);
+
+ subset_resource = _cairo_pdf_surface_new_object (surface);
+ _cairo_output_stream_printf (surface->output,
+ "%d 0 obj\r\n"
+ "<< /Type /Font\r\n"
+ " /Subtype /Type1\r\n"
+ " /BaseFont /%s\r\n"
+ " /FirstChar 0\r\n"
+ " /LastChar %d\r\n"
+ " /FontDescriptor %d 0 R\r\n"
+ " /Widths [",
+ subset_resource.id,
+ subset.base_font,
+ font_subset->num_glyphs,
+ descriptor.id);
+
+ for (i = 0; i < font_subset->num_glyphs; i++)
+ _cairo_output_stream_printf (surface->output,
+ " %d",
+ subset.widths[i]);
+
+ _cairo_output_stream_printf (surface->output,
+ " ]\r\n"
+ ">>\r\n"
+ "endobj\r\n");
+
+ font.font_id = font_subset->font_id;
+ font.subset_id = font_subset->subset_id;
+ font.subset_resource = subset_resource;
+ _cairo_array_append (&surface->fonts, &font);
+
+ _cairo_cff_subset_fini (&subset);
+
+ return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
_cairo_pdf_surface_emit_type1_font (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset,
cairo_type1_subset_t *subset)
@@ -2059,6 +2162,10 @@ _cairo_pdf_surface_emit_font_subset (cai
cairo_pdf_surface_t *surface = closure;
cairo_status_t status;
+ status = _cairo_pdf_surface_emit_cff_font_subset (surface, font_subset);
+ if (status != CAIRO_INT_STATUS_UNSUPPORTED)
+ return;
+
#if CAIRO_HAS_FT_FONT
status = _cairo_pdf_surface_emit_type1_font_subset (surface, font_subset);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
diff --git a/src/cairo-scaled-font-subsets-private.h b/src/cairo-scaled-font-subsets-private.h
index 01eeb3f..2c81fdc 100644
--- a/src/cairo-scaled-font-subsets-private.h
+++ b/src/cairo-scaled-font-subsets-private.h
@@ -179,6 +179,46 @@ _cairo_scaled_font_subsets_foreach (cair
cairo_scaled_font_subset_callback_func_t font_subset_callback,
void *closure);
+typedef struct _cairo_cff_subset {
+ char *base_font;
+ int *widths;
+ long x_min, y_min, x_max, y_max;
+ long ascent, descent;
+ char *data;
+ unsigned long data_length;
+} cairo_cff_subset_t;
+
+/**
+ * _cairo_cff_subset_init:
+ * @cff_subset: a #cairo_cff_subset_t to initialize
+ * @font_subset: the #cairo_scaled_font_subset_t to initialize from
+ *
+ * If possible (depending on the format of the underlying
+ * cairo_scaled_font_t and the font backend in use) generate a
+ * cff file corresponding to @font_subset and initialize
+ * @cff_subset with information about the subset and the cff
+ * data.
+ *
+ * Return value: CAIRO_STATUS_SUCCESS if successful,
+ * CAIRO_INT_STATUS_UNSUPPORTED if the font can't be subset as a
+ * cff file, or an non-zero value indicating an error. Possible
+ * errors include CAIRO_STATUS_NO_MEMORY.
+ **/
+cairo_private cairo_status_t
+_cairo_cff_subset_init (cairo_cff_subset_t *cff_subset,
+ const char *name,
+ cairo_scaled_font_subset_t *font_subset);
+
+/**
+ * _cairo_cff_subset_fini:
+ * @cff_subset: a #cairo_cff_subset_t
+ *
+ * Free all resources associated with @cff_subset. After this
+ * call, @cff_subset should not be used again without a
+ * subsequent call to _cairo_cff_subset_init() again first.
+ **/
+cairo_private void
+_cairo_cff_subset_fini (cairo_cff_subset_t *cff_subset);
typedef struct _cairo_truetype_subset {
char *base_font;
diff --git a/src/cairo-truetype-subset-private.h b/src/cairo-truetype-subset-private.h
index 51bf906..e9b2c47 100644
--- a/src/cairo-truetype-subset-private.h
+++ b/src/cairo-truetype-subset-private.h
@@ -51,6 +51,7 @@ #include "cairoint.h"
*/
#define MAKE_TT_TAG(a, b, c, d) (a<<24 | b<<16 | c<<8 | d)
+#define TT_TAG_CFF MAKE_TT_TAG('C','F','F',' ')
#define TT_TAG_cmap MAKE_TT_TAG('c','m','a','p')
#define TT_TAG_cvt MAKE_TT_TAG('c','v','t',' ')
#define TT_TAG_fpgm MAKE_TT_TAG('f','p','g','m')
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