245 lines
7.5 KiB
C++
245 lines
7.5 KiB
C++
/*
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* Copyright © 2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb.hh"
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#include "hb-ot-name-table.hh"
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#include "hb-ot-face.hh"
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#include "hb-utf.hh"
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/**
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* SECTION:hb-ot-name
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* @title: hb-ot-name
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* @short_description: OpenType font name information
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* @include: hb-ot.h
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*
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* Functions for fetching name strings from OpenType fonts.
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**/
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/**
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* hb_ot_name_list_names:
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* @face: font face.
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* @num_entries: (out) (allow-none): number of returned entries.
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*
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* Enumerates all available name IDs and language combinations. Returned
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* array is owned by the @face and should not be modified. It can be
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* used as long as @face is alive.
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*
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* Returns: (out) (transfer none) (array length=num_entries): Array of available name entries.
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* Since: 2.1.0
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**/
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const hb_ot_name_entry_t *
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hb_ot_name_list_names (hb_face_t *face,
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unsigned int *num_entries /* OUT */)
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{
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#ifdef HB_NO_NAME
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if (num_entries)
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*num_entries = 0;
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return 0;
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#endif
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const OT::name_accelerator_t &name = *face->table.name;
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if (num_entries) *num_entries = name.names.length;
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return (const hb_ot_name_entry_t *) name.names;
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}
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template <typename in_utf_t, typename out_utf_t>
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static inline unsigned int
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hb_ot_name_convert_utf (hb_bytes_t bytes,
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unsigned int *text_size /* IN/OUT */,
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typename out_utf_t::codepoint_t *text /* OUT */)
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{
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unsigned int src_len = bytes.length / sizeof (typename in_utf_t::codepoint_t);
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const typename in_utf_t::codepoint_t *src = (const typename in_utf_t::codepoint_t *) bytes.arrayZ;
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const typename in_utf_t::codepoint_t *src_end = src + src_len;
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typename out_utf_t::codepoint_t *dst = text;
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hb_codepoint_t unicode;
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const hb_codepoint_t replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
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if (text_size && *text_size)
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{
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(*text_size)--; /* Same room for NUL-termination. */
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const typename out_utf_t::codepoint_t *dst_end = text + *text_size;
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while (src < src_end && dst < dst_end)
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{
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const typename in_utf_t::codepoint_t *src_next = in_utf_t::next (src, src_end, &unicode, replacement);
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typename out_utf_t::codepoint_t *dst_next = out_utf_t::encode (dst, dst_end, unicode);
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if (dst_next == dst)
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break; /* Out-of-room. */
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dst = dst_next;
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src = src_next;
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}
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*text_size = dst - text;
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*dst = 0; /* NUL-terminate. */
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}
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/* Accumulate length of rest. */
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unsigned int dst_len = dst - text;
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while (src < src_end)
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{
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src = in_utf_t::next (src, src_end, &unicode, replacement);
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dst_len += out_utf_t::encode_len (unicode);
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}
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return dst_len;
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}
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template <typename utf_t>
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static inline unsigned int
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hb_ot_name_get_utf (hb_face_t *face,
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hb_ot_name_id_t name_id,
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hb_language_t language,
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unsigned int *text_size /* IN/OUT */,
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typename utf_t::codepoint_t *text /* OUT */)
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{
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const OT::name_accelerator_t &name = *face->table.name;
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if (!language)
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language = hb_language_from_string ("en", 2);
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unsigned int width;
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int idx = name.get_index (name_id, language, &width);
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if (idx != -1)
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{
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hb_bytes_t bytes = name.get_name (idx);
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if (width == 2) /* UTF16-BE */
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return hb_ot_name_convert_utf<hb_utf16_be_t, utf_t> (bytes, text_size, text);
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if (width == 1) /* ASCII */
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return hb_ot_name_convert_utf<hb_ascii_t, utf_t> (bytes, text_size, text);
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}
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if (text_size)
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{
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if (*text_size)
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*text = 0;
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*text_size = 0;
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}
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return 0;
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}
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/**
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* hb_ot_name_get_utf8:
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* @face: font face.
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* @name_id: OpenType name identifier to fetch.
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* @language: language to fetch the name for.
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* @text_size: (inout) (allow-none): input size of @text buffer, and output size of
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* text written to buffer.
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* @text: (out caller-allocates) (array length=text_size): buffer to write fetched name into.
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*
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* Fetches a font name from the OpenType 'name' table.
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* If @language is #HB_LANGUAGE_INVALID, English ("en") is assumed.
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* Returns string in UTF-8 encoding.
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*
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* Returns: full length of the requested string, or 0 if not found.
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* Since: 2.1.0
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**/
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unsigned int
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hb_ot_name_get_utf8 (hb_face_t *face,
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hb_ot_name_id_t name_id,
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hb_language_t language,
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unsigned int *text_size /* IN/OUT */,
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char *text /* OUT */)
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{
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#ifdef HB_NO_NAME
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if (text_size)
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*text_size = 0;
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return 0;
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#endif
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return hb_ot_name_get_utf<hb_utf8_t> (face, name_id, language, text_size,
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(hb_utf8_t::codepoint_t *) text);
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}
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/**
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* hb_ot_name_get_utf16:
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* @face: font face.
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* @name_id: OpenType name identifier to fetch.
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* @language: language to fetch the name for.
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* @text_size: (inout) (allow-none): input size of @text buffer, and output size of
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* text written to buffer.
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* @text: (out caller-allocates) (array length=text_size): buffer to write fetched name into.
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*
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* Fetches a font name from the OpenType 'name' table.
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* If @language is #HB_LANGUAGE_INVALID, English ("en") is assumed.
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* Returns string in UTF-16 encoding.
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*
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* Returns: full length of the requested string, or 0 if not found.
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* Since: 2.1.0
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**/
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unsigned int
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hb_ot_name_get_utf16 (hb_face_t *face,
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hb_ot_name_id_t name_id,
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hb_language_t language,
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unsigned int *text_size /* IN/OUT */,
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uint16_t *text /* OUT */)
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{
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#ifdef HB_NO_NAME
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if (text_size)
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*text_size = 0;
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return 0;
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#endif
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return hb_ot_name_get_utf<hb_utf16_t> (face, name_id, language, text_size, text);
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}
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/**
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* hb_ot_name_get_utf32:
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* @face: font face.
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* @name_id: OpenType name identifier to fetch.
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* @language: language to fetch the name for.
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* @text_size: (inout) (allow-none): input size of @text buffer, and output size of
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* text written to buffer.
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* @text: (out caller-allocates) (array length=text_size): buffer to write fetched name into.
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*
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* Fetches a font name from the OpenType 'name' table.
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* If @language is #HB_LANGUAGE_INVALID, English ("en") is assumed.
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* Returns string in UTF-32 encoding.
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*
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* Returns: full length of the requested string, or 0 if not found.
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* Since: 2.1.0
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**/
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unsigned int
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hb_ot_name_get_utf32 (hb_face_t *face,
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hb_ot_name_id_t name_id,
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hb_language_t language,
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unsigned int *text_size /* IN/OUT */,
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uint32_t *text /* OUT */)
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{
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#ifdef HB_NO_NAME
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if (text_size)
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*text_size = 0;
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return 0;
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#endif
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return hb_ot_name_get_utf<hb_utf32_t> (face, name_id, language, text_size, text);
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}
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