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cairo-scaled-font-subsets.c
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/* 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 <[email protected]>
* Kristian Høgsberg <[email protected]>
* Keith Packard <[email protected]>
* Adrian Johnson <[email protected]>
*/
#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++;