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harfbuzz/src/hb-subset-input.cc

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/*
* Copyright © 2018 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.
*
* Google Author(s): Garret Rieger, Rod Sheeter, Behdad Esfahbod
*/
#include "hb-subset.hh"
#include "hb-set.hh"
#include "hb-utf.hh"
/**
* hb_subset_input_create_or_fail:
*
* Creates a new subset input object.
*
* Return value: (transfer full): New subset input, or `NULL` if failed. Destroy
* with hb_subset_input_destroy().
*
* Since: 1.8.0
**/
hb_subset_input_t *
hb_subset_input_create_or_fail (void)
{
hb_subset_input_t *input = hb_object_create<hb_subset_input_t>();
if (unlikely (!input))
return nullptr;
for (auto& set : input->sets_iter ())
set = hb_set_create ();
input->axes_location = hb_hashmap_create<hb_tag_t, float> ();
#ifdef HB_EXPERIMENTAL_API
input->name_table_overrides = hb_hashmap_create<hb_ot_name_record_ids_t, hb_bytes_t> ();
#endif
if (!input->axes_location ||
#ifdef HB_EXPERIMENTAL_API
!input->name_table_overrides ||
#endif
input->in_error ())
{
hb_subset_input_destroy (input);
return nullptr;
}
input->flags = HB_SUBSET_FLAGS_DEFAULT;
hb_set_add_range (input->sets.name_ids, 0, 6);
hb_set_add (input->sets.name_languages, 0x0409);
hb_tag_t default_drop_tables[] = {
// Layout disabled by default
HB_TAG ('m', 'o', 'r', 'x'),
HB_TAG ('m', 'o', 'r', 't'),
HB_TAG ('k', 'e', 'r', 'x'),
HB_TAG ('k', 'e', 'r', 'n'),
// Copied from fontTools:
HB_TAG ('B', 'A', 'S', 'E'),
HB_TAG ('J', 'S', 'T', 'F'),
HB_TAG ('D', 'S', 'I', 'G'),
HB_TAG ('E', 'B', 'D', 'T'),
HB_TAG ('E', 'B', 'L', 'C'),
HB_TAG ('E', 'B', 'S', 'C'),
HB_TAG ('S', 'V', 'G', ' '),
HB_TAG ('P', 'C', 'L', 'T'),
HB_TAG ('L', 'T', 'S', 'H'),
// Graphite tables
HB_TAG ('F', 'e', 'a', 't'),
HB_TAG ('G', 'l', 'a', 't'),
HB_TAG ('G', 'l', 'o', 'c'),
HB_TAG ('S', 'i', 'l', 'f'),
HB_TAG ('S', 'i', 'l', 'l'),
};
input->sets.drop_tables->add_array (default_drop_tables, ARRAY_LENGTH (default_drop_tables));
hb_tag_t default_no_subset_tables[] = {
HB_TAG ('a', 'v', 'a', 'r'),
HB_TAG ('g', 'a', 's', 'p'),
HB_TAG ('c', 'v', 't', ' '),
HB_TAG ('f', 'p', 'g', 'm'),
HB_TAG ('p', 'r', 'e', 'p'),
HB_TAG ('V', 'D', 'M', 'X'),
HB_TAG ('D', 'S', 'I', 'G'),
HB_TAG ('M', 'V', 'A', 'R'),
HB_TAG ('c', 'v', 'a', 'r'),
};
input->sets.no_subset_tables->add_array (default_no_subset_tables,
ARRAY_LENGTH (default_no_subset_tables));
//copied from _layout_features_groups in fonttools
hb_tag_t default_layout_features[] = {
// default shaper
// common
HB_TAG ('r', 'v', 'r', 'n'),
HB_TAG ('c', 'c', 'm', 'p'),
HB_TAG ('l', 'i', 'g', 'a'),
HB_TAG ('l', 'o', 'c', 'l'),
HB_TAG ('m', 'a', 'r', 'k'),
HB_TAG ('m', 'k', 'm', 'k'),
HB_TAG ('r', 'l', 'i', 'g'),
//fractions
HB_TAG ('f', 'r', 'a', 'c'),
HB_TAG ('n', 'u', 'm', 'r'),
HB_TAG ('d', 'n', 'o', 'm'),
//horizontal
HB_TAG ('c', 'a', 'l', 't'),
HB_TAG ('c', 'l', 'i', 'g'),
HB_TAG ('c', 'u', 'r', 's'),
HB_TAG ('k', 'e', 'r', 'n'),
HB_TAG ('r', 'c', 'l', 't'),
//vertical
HB_TAG ('v', 'a', 'l', 't'),
HB_TAG ('v', 'e', 'r', 't'),
HB_TAG ('v', 'k', 'r', 'n'),
HB_TAG ('v', 'p', 'a', 'l'),
HB_TAG ('v', 'r', 't', '2'),
//ltr
HB_TAG ('l', 't', 'r', 'a'),
HB_TAG ('l', 't', 'r', 'm'),
//rtl
HB_TAG ('r', 't', 'l', 'a'),
HB_TAG ('r', 't', 'l', 'm'),
//random
HB_TAG ('r', 'a', 'n', 'd'),
//justify
HB_TAG ('j', 'a', 'l', 't'), // HarfBuzz doesn't use; others might
//private
HB_TAG ('H', 'a', 'r', 'f'),
HB_TAG ('H', 'A', 'R', 'F'),
HB_TAG ('B', 'u', 'z', 'z'),
HB_TAG ('B', 'U', 'Z', 'Z'),
//shapers
//arabic
HB_TAG ('i', 'n', 'i', 't'),
HB_TAG ('m', 'e', 'd', 'i'),
HB_TAG ('f', 'i', 'n', 'a'),
HB_TAG ('i', 's', 'o', 'l'),
HB_TAG ('m', 'e', 'd', '2'),
HB_TAG ('f', 'i', 'n', '2'),
HB_TAG ('f', 'i', 'n', '3'),
HB_TAG ('c', 's', 'w', 'h'),
HB_TAG ('m', 's', 'e', 't'),
HB_TAG ('s', 't', 'c', 'h'),
//hangul
HB_TAG ('l', 'j', 'm', 'o'),
HB_TAG ('v', 'j', 'm', 'o'),
HB_TAG ('t', 'j', 'm', 'o'),
//tibetan
HB_TAG ('a', 'b', 'v', 's'),
HB_TAG ('b', 'l', 'w', 's'),
HB_TAG ('a', 'b', 'v', 'm'),
HB_TAG ('b', 'l', 'w', 'm'),
//indic
HB_TAG ('n', 'u', 'k', 't'),
HB_TAG ('a', 'k', 'h', 'n'),
HB_TAG ('r', 'p', 'h', 'f'),
HB_TAG ('r', 'k', 'r', 'f'),
HB_TAG ('p', 'r', 'e', 'f'),
HB_TAG ('b', 'l', 'w', 'f'),
HB_TAG ('h', 'a', 'l', 'f'),
HB_TAG ('a', 'b', 'v', 'f'),
HB_TAG ('p', 's', 't', 'f'),
HB_TAG ('c', 'f', 'a', 'r'),
HB_TAG ('v', 'a', 't', 'u'),
HB_TAG ('c', 'j', 'c', 't'),
HB_TAG ('i', 'n', 'i', 't'),
HB_TAG ('p', 'r', 'e', 's'),
HB_TAG ('a', 'b', 'v', 's'),
HB_TAG ('b', 'l', 'w', 's'),
HB_TAG ('p', 's', 't', 's'),
HB_TAG ('h', 'a', 'l', 'n'),
HB_TAG ('d', 'i', 's', 't'),
HB_TAG ('a', 'b', 'v', 'm'),
HB_TAG ('b', 'l', 'w', 'm'),
};
input->sets.layout_features->add_array (default_layout_features, ARRAY_LENGTH (default_layout_features));
input->sets.layout_scripts->invert (); // Default to all scripts.
if (input->in_error ())
{
hb_subset_input_destroy (input);
return nullptr;
}
return input;
}
/**
* hb_subset_input_reference: (skip)
* @input: a #hb_subset_input_t object.
*
* Increases the reference count on @input.
*
* Return value: @input.
*
* Since: 1.8.0
**/
hb_subset_input_t *
hb_subset_input_reference (hb_subset_input_t *input)
{
return hb_object_reference (input);
}
/**
* hb_subset_input_destroy:
* @input: a #hb_subset_input_t object.
*
* Decreases the reference count on @input, and if it reaches zero, destroys
* @input, freeing all memory.
*
* Since: 1.8.0
**/
void
hb_subset_input_destroy (hb_subset_input_t *input)
{
if (!hb_object_destroy (input)) return;
for (hb_set_t* set : input->sets_iter ())
hb_set_destroy (set);
hb_hashmap_destroy (input->axes_location);
#ifdef HB_EXPERIMENTAL_API
if (input->name_table_overrides)
{
for (auto _ : *input->name_table_overrides)
_.second.fini ();
}
hb_hashmap_destroy (input->name_table_overrides);
#endif
hb_free (input);
}
/**
* hb_subset_input_unicode_set:
* @input: a #hb_subset_input_t object.
*
* Gets the set of Unicode code points to retain, the caller should modify the
* set as needed.
*
* Return value: (transfer none): pointer to the #hb_set_t of Unicode code
* points.
*
* Since: 1.8.0
**/
HB_EXTERN hb_set_t *
hb_subset_input_unicode_set (hb_subset_input_t *input)
{
return input->sets.unicodes;
}
/**
* hb_subset_input_glyph_set:
* @input: a #hb_subset_input_t object.
*
* Gets the set of glyph IDs to retain, the caller should modify the set as
* needed.
*
* Return value: (transfer none): pointer to the #hb_set_t of glyph IDs.
*
* Since: 1.8.0
**/
HB_EXTERN hb_set_t *
hb_subset_input_glyph_set (hb_subset_input_t *input)
{
return input->sets.glyphs;
}
/**
* hb_subset_input_set:
* @input: a #hb_subset_input_t object.
* @set_type: a #hb_subset_sets_t set type.
*
* Gets the set of the specified type.
*
* Return value: (transfer none): pointer to the #hb_set_t of the specified type.
*
* Since: 2.9.1
**/
HB_EXTERN hb_set_t *
hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type)
{
return input->sets_iter () [set_type];
}
/**
* hb_subset_input_get_flags:
* @input: a #hb_subset_input_t object.
*
* Gets all of the subsetting flags in the input object.
*
* Return value: the subsetting flags bit field.
*
* Since: 2.9.0
**/
HB_EXTERN hb_subset_flags_t
hb_subset_input_get_flags (hb_subset_input_t *input)
{
return (hb_subset_flags_t) input->flags;
}
/**
* hb_subset_input_set_flags:
* @input: a #hb_subset_input_t object.
* @value: bit field of flags
*
* Sets all of the flags in the input object to the values specified by the bit
* field.
*
* Since: 2.9.0
**/
HB_EXTERN void
hb_subset_input_set_flags (hb_subset_input_t *input,
unsigned value)
{
input->flags = (hb_subset_flags_t) value;
}
/**
* hb_subset_input_set_user_data: (skip)
* @input: a #hb_subset_input_t object.
* @key: The user-data key to set
* @data: A pointer to the user data
* @destroy: (nullable): A callback to call when @data is not needed anymore
* @replace: Whether to replace an existing data with the same key
*
* Attaches a user-data key/data pair to the given subset input object.
*
* Return value: `true` if success, `false` otherwise
*
* Since: 2.9.0
**/
hb_bool_t
hb_subset_input_set_user_data (hb_subset_input_t *input,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy,
hb_bool_t replace)
{
return hb_object_set_user_data (input, key, data, destroy, replace);
}
/**
* hb_subset_input_get_user_data: (skip)
* @input: a #hb_subset_input_t object.
* @key: The user-data key to query
*
* Fetches the user data associated with the specified key,
* attached to the specified subset input object.
*
* Return value: (transfer none): A pointer to the user data
*
* Since: 2.9.0
**/
void *
hb_subset_input_get_user_data (const hb_subset_input_t *input,
hb_user_data_key_t *key)
{
return hb_object_get_user_data (input, key);
}
#ifndef HB_NO_VAR
/**
* hb_subset_input_pin_axis_to_default: (skip)
* @input: a #hb_subset_input_t object.
* @axis_tag: Tag of the axis to be pinned
*
* Pin an axis to its default location in the given subset input object.
*
* Currently only works for fonts with 'glyf' tables. CFF and CFF2 is not
* yet supported. Additionally all axes in a font must be pinned.
*
* Return value: `true` if success, `false` otherwise
*
* Since: 6.0.0
**/
HB_EXTERN hb_bool_t
hb_subset_input_pin_axis_to_default (hb_subset_input_t *input,
hb_face_t *face,
hb_tag_t axis_tag)
{
hb_ot_var_axis_info_t axis_info;
if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
return false;
return input->axes_location->set (axis_tag, axis_info.default_value);
}
/**
* hb_subset_input_pin_axis_location: (skip)
* @input: a #hb_subset_input_t object.
* @axis_tag: Tag of the axis to be pinned
* @axis_value: Location on the axis to be pinned at
*
* Pin an axis to a fixed location in the given subset input object.
*
* Currently only works for fonts with 'glyf' tables. CFF and CFF2 is not
* yet supported. Additionally all axes in a font must be pinned.
*
* Return value: `true` if success, `false` otherwise
*
* Since: 6.0.0
**/
HB_EXTERN hb_bool_t
hb_subset_input_pin_axis_location (hb_subset_input_t *input,
hb_face_t *face,
hb_tag_t axis_tag,
float axis_value)
{
hb_ot_var_axis_info_t axis_info;
if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
return false;
float val = hb_clamp(axis_value, axis_info.min_value, axis_info.max_value);
return input->axes_location->set (axis_tag, val);
}
#endif
/**
* hb_subset_preprocess:
* @source: a #hb_face_t object.
*
* Preprocesses the face and attaches data that will be needed by the
* subsetter. Future subsetting operations can then use the precomputed data
* to speed up the subsetting operation.
*
* See [subset-preprocessing](https://github.com/harfbuzz/harfbuzz/blob/main/docs/subset-preprocessing.md)
* for more information.
*
* Note: the preprocessed face may contain sub-blobs that reference the memory
* backing the source #hb_face_t. Therefore in the case that this memory is not
* owned by the source face you will need to ensure that memory lives
* as long as the returned #hb_face_t.
*
* Returns: a new #hb_face_t.
*
* Since: 6.0.0
**/
HB_EXTERN hb_face_t *
hb_subset_preprocess (hb_face_t *source)
{
hb_subset_input_t* input = hb_subset_input_create_or_fail ();
if (!input)
return source;
hb_set_clear (hb_subset_input_set(input, HB_SUBSET_SETS_UNICODE));
hb_set_invert (hb_subset_input_set(input, HB_SUBSET_SETS_UNICODE));
hb_set_clear (hb_subset_input_set(input, HB_SUBSET_SETS_GLYPH_INDEX));
hb_set_invert (hb_subset_input_set(input, HB_SUBSET_SETS_GLYPH_INDEX));
hb_set_clear (hb_subset_input_set(input,
HB_SUBSET_SETS_LAYOUT_FEATURE_TAG));
hb_set_invert (hb_subset_input_set(input,
HB_SUBSET_SETS_LAYOUT_FEATURE_TAG));
hb_set_clear (hb_subset_input_set(input,
HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG));
hb_set_invert (hb_subset_input_set(input,
HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG));
hb_set_clear (hb_subset_input_set(input,
HB_SUBSET_SETS_NAME_ID));
hb_set_invert (hb_subset_input_set(input,
HB_SUBSET_SETS_NAME_ID));
hb_set_clear (hb_subset_input_set(input,
HB_SUBSET_SETS_NAME_LANG_ID));
hb_set_invert (hb_subset_input_set(input,
HB_SUBSET_SETS_NAME_LANG_ID));
hb_subset_input_set_flags(input,
HB_SUBSET_FLAGS_NOTDEF_OUTLINE |
HB_SUBSET_FLAGS_GLYPH_NAMES |
HB_SUBSET_FLAGS_RETAIN_GIDS |
HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES);
input->attach_accelerator_data = true;
// Always use long loca in the preprocessed version. This allows
// us to store the glyph bytes unpadded which allows the future subset
// operation to run faster by skipping the trim padding step.
input->force_long_loca = true;
hb_face_t* new_source = hb_subset_or_fail (source, input);
hb_subset_input_destroy (input);
if (!new_source) {
DEBUG_MSG (SUBSET, nullptr, "Preprocessing failed due to subset failure.");
return source;
}
return new_source;
}
#ifdef HB_EXPERIMENTAL_API
/**
* hb_subset_input_override_name_table:
* @input: a #hb_subset_input_t object.
* @name_id: name_id of a nameRecord
* @platform_id: platform ID of a nameRecord
* @encoding_id: encoding ID of a nameRecord
* @language_id: language ID of a nameRecord
* @name_str: pointer to name string new value or null to indicate should remove
* @str_len: the size of @name_str, or -1 if it is `NULL`-terminated
*
* Override the name string of the NameRecord identified by name_id,
* platform_id, encoding_id and language_id. If a record with that name_id
* doesn't exist, create it and insert to the name table.
*
* Note: for mac platform, we only support name_str with all ascii characters,
* name_str with non-ascii characters will be ignored.
*
* Since: EXPERIMENTAL
**/
HB_EXTERN hb_bool_t
hb_subset_input_override_name_table (hb_subset_input_t *input,
hb_ot_name_id_t name_id,
unsigned platform_id,
unsigned encoding_id,
unsigned language_id,
const char *name_str,
int str_len /* -1 means nul-terminated */)
{
if (!name_str)
{
str_len = 0;
}
else if (str_len == -1)
{
str_len = strlen (name_str);
}
hb_bytes_t name_bytes (nullptr, 0);
if (str_len)
{
if (platform_id == 1)
{
const uint8_t *src = reinterpret_cast<const uint8_t*> (name_str);
const uint8_t *src_end = src + str_len;
hb_codepoint_t unicode;
const hb_codepoint_t replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
while (src < src_end)
{
src = hb_utf8_t::next (src, src_end, &unicode, replacement);
if (unicode >= 0x0080u)
{
printf ("Non-ascii character detected, ignored...This API supports acsii characters only for mac platform\n");
return false;
}
}
}
char *override_name = (char *) hb_malloc (str_len);
if (unlikely (!override_name)) return false;
hb_memcpy (override_name, name_str, str_len);
name_bytes = hb_bytes_t (override_name, str_len);
}
input->name_table_overrides->set (hb_ot_name_record_ids_t (platform_id, encoding_id, language_id, name_id), name_bytes);
return true;
}
#endif
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