Source code
Revision control
Copy as Markdown
Other Tools
/*
* Copyright © 2009 Red Hat, Inc.
* Copyright © 2012 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
* Google Author(s): Behdad Esfahbod
*/
#include "hb.hh"
#include "hb-face.hh"
#include "hb-map.hh"
#include "hb-open-file.hh"
#include "hb-serialize.hh"
/*
* face-builder: A face that has add_table().
*/
struct face_table_info_t
{
hb_blob_t* data;
unsigned order;
};
struct hb_face_builder_data_t
{
hb_hashmap_t<hb_tag_t, face_table_info_t> tables;
};
static int compare_entries (const void* pa, const void* pb)
{
const auto& a = * (const hb_pair_t<hb_tag_t, face_table_info_t> *) pa;
const auto& b = * (const hb_pair_t<hb_tag_t, face_table_info_t> *) pb;
/* Order by blob size first (smallest to largest) and then table tag */
if (a.second.order != b.second.order)
return a.second.order < b.second.order ? -1 : +1;
if (a.second.data->length != b.second.data->length)
return a.second.data->length < b.second.data->length ? -1 : +1;
return a.first < b.first ? -1 : a.first == b.first ? 0 : +1;
}
static hb_face_builder_data_t *
_hb_face_builder_data_create ()
{
hb_face_builder_data_t *data = (hb_face_builder_data_t *) hb_calloc (1, sizeof (hb_face_builder_data_t));
if (unlikely (!data))
return nullptr;
data->tables.init ();
return data;
}
static void
_hb_face_builder_data_destroy (void *user_data)
{
hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
for (auto info : data->tables.values())
hb_blob_destroy (info.data);
data->tables.fini ();
hb_free (data);
}
static hb_blob_t *
_hb_face_builder_data_reference_blob (hb_face_builder_data_t *data)
{
unsigned int table_count = data->tables.get_population ();
unsigned int face_length = table_count * 16 + 12;
for (auto info : data->tables.values())
face_length += hb_ceil_to_4 (hb_blob_get_length (info.data));
char *buf = (char *) hb_malloc (face_length);
if (unlikely (!buf))
return nullptr;
hb_serialize_context_t c (buf, face_length);
c.propagate_error (data->tables);
OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
bool is_cff = (data->tables.has (HB_TAG ('C','F','F',' '))
|| data->tables.has (HB_TAG ('C','F','F','2')));
hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
// Sort the tags so that produced face is deterministic.
hb_vector_t<hb_pair_t <hb_tag_t, face_table_info_t>> sorted_entries;
data->tables.iter () | hb_sink (sorted_entries);
if (unlikely (sorted_entries.in_error ()))
{
hb_free (buf);
return nullptr;
}
sorted_entries.qsort (compare_entries);
bool ret = f->serialize_single (&c,
sfnt_tag,
+ sorted_entries.iter()
| hb_map ([&] (hb_pair_t<hb_tag_t, face_table_info_t> _) {
return hb_pair_t<hb_tag_t, hb_blob_t*> (_.first, _.second.data);
}));
c.end_serialize ();
if (unlikely (!ret))
{
hb_free (buf);
return nullptr;
}
return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, hb_free);
}
static hb_blob_t *
_hb_face_builder_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
{
hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
if (!tag)
return _hb_face_builder_data_reference_blob (data);
return hb_blob_reference (data->tables[tag].data);
}
static unsigned
_hb_face_builder_get_table_tags (const hb_face_t *face HB_UNUSED,
unsigned int start_offset,
unsigned int *table_count,
hb_tag_t *table_tags,
void *user_data)
{
hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
unsigned population = data->tables.get_population ();
if (!table_count)
return population;
if (unlikely (start_offset >= population))
{
if (table_count)
*table_count = 0;
return population;
}
// Sort the tags.
hb_vector_t<hb_tag_t> sorted_tags;
data->tables.keys () | hb_sink (sorted_tags);
if (unlikely (sorted_tags.in_error ()))
{
// Not much to do...
}
sorted_tags.qsort ([] (const void* a, const void* b) {
return * (hb_tag_t *) a < * (hb_tag_t *) b ? -1 :
* (hb_tag_t *) a == * (hb_tag_t *) b ? 0 :
+1;
});
auto array = sorted_tags.as_array ().sub_array (start_offset, table_count);
auto out = hb_array (table_tags, *table_count);
+ array.iter ()
| hb_sink (out)
;
return population;
}
/**
* hb_face_builder_create:
*
* Creates a #hb_face_t that can be used with hb_face_builder_add_table().
* After tables are added to the face, it can be compiled to a binary
* font file by calling hb_face_reference_blob().
*
* Return value: (transfer full): New face.
*
* Since: 1.9.0
**/
hb_face_t *
hb_face_builder_create ()
{
hb_face_builder_data_t *data = _hb_face_builder_data_create ();
if (unlikely (!data)) return hb_face_get_empty ();
hb_face_t *face = hb_face_create_for_tables (_hb_face_builder_reference_table,
data,
_hb_face_builder_data_destroy);
hb_face_set_get_table_tags_func (face,
_hb_face_builder_get_table_tags,
data,
nullptr);
return face;
}
/**
* hb_face_builder_add_table:
* @face: A face object created with hb_face_builder_create()
* @tag: The #hb_tag_t of the table to add
* @blob: The blob containing the table data to add
*
* Add table for @tag with data provided by @blob to the face. @face must
* be created using hb_face_builder_create().
*
* Since: 1.9.0
**/
hb_bool_t
hb_face_builder_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
{
if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
return false;
if (tag == HB_MAP_VALUE_INVALID)
return false;
hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
hb_blob_t* previous = data->tables.get (tag).data;
if (!data->tables.set (tag, face_table_info_t {hb_blob_reference (blob), (unsigned) -1}))
{
hb_blob_destroy (blob);
return false;
}
hb_blob_destroy (previous);
return true;
}
/**
* hb_face_builder_sort_tables:
* @face: A face object created with hb_face_builder_create()
* @tags: (array zero-terminated=1): ordered list of table tags terminated by
* %HB_TAG_NONE
*
* Set the ordering of tables for serialization. Any tables not
* specified in the tags list will be ordered after the tables in
* tags, ordered by the default sort ordering.
*
* Since: 5.3.0
**/
void
hb_face_builder_sort_tables (hb_face_t *face,
const hb_tag_t *tags)
{
if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
return;
hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
// Sort all unspecified tables after any specified tables.
for (auto& info : data->tables.values_ref())
info.order = (unsigned) -1;
signed order = 0;
for (const hb_tag_t* tag = tags;
*tag;
tag++)
{
face_table_info_t* info;
if (!data->tables.has (*tag, &info)) continue;
info->order = order++;
}
}