301 lines
8 KiB
C++
301 lines
8 KiB
C++
/*
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* Copyright © 2009 Red Hat, Inc.
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* Copyright © 2011 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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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb.hh"
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#ifdef HAVE_GLIB
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#include "hb-glib.h"
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#include "hb-machinery.hh"
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/**
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* SECTION:hb-glib
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* @title: hb-glib
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* @short_description: GLib integration
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* @include: hb-glib.h
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*
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* Functions for using HarfBuzz with the GLib library.
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*
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* HarfBuzz supports using GLib to provide Unicode data, by attaching
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* GLib functions to the virtual methods in a #hb_unicode_funcs_t function
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* structure.
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**/
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/**
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* hb_glib_script_to_script:
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* @script: The GUnicodeScript identifier to query
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*
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* Fetches the #hb_script_t script that corresponds to the
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* specified GUnicodeScript identifier.
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*
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* Return value: the #hb_script_t script found
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*
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* Since: 0.9.38
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**/
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hb_script_t
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hb_glib_script_to_script (GUnicodeScript script)
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{
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return (hb_script_t) g_unicode_script_to_iso15924 (script);
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}
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/**
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* hb_glib_script_from_script:
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* @script: The #hb_script_t to query
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*
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* Fetches the GUnicodeScript identifier that corresponds to the
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* specified #hb_script_t script.
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*
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* Return value: the GUnicodeScript identifier found
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*
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* Since: 0.9.38
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**/
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GUnicodeScript
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hb_glib_script_from_script (hb_script_t script)
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{
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return g_unicode_script_from_iso15924 (script);
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}
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static hb_unicode_combining_class_t
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hb_glib_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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return (hb_unicode_combining_class_t) g_unichar_combining_class (unicode);
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}
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static hb_unicode_general_category_t
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hb_glib_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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/* hb_unicode_general_category_t and GUnicodeType are identical */
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return (hb_unicode_general_category_t) g_unichar_type (unicode);
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}
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static hb_codepoint_t
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hb_glib_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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g_unichar_get_mirror_char (unicode, &unicode);
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return unicode;
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}
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static hb_script_t
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hb_glib_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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return hb_glib_script_to_script (g_unichar_get_script (unicode));
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}
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static hb_bool_t
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hb_glib_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t a,
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hb_codepoint_t b,
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hb_codepoint_t *ab,
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void *user_data HB_UNUSED)
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{
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#if GLIB_CHECK_VERSION(2,29,12)
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return g_unichar_compose (a, b, ab);
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#endif
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/* We don't ifdef-out the fallback code such that compiler always
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* sees it and makes sure it's compilable. */
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gchar utf8[12];
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gchar *normalized;
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int len;
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hb_bool_t ret;
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len = g_unichar_to_utf8 (a, utf8);
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len += g_unichar_to_utf8 (b, utf8 + len);
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normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFC);
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len = g_utf8_strlen (normalized, -1);
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if (unlikely (!len))
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return false;
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if (len == 1) {
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*ab = g_utf8_get_char (normalized);
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ret = true;
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} else {
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ret = false;
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}
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g_free (normalized);
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return ret;
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}
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static hb_bool_t
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hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t ab,
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hb_codepoint_t *a,
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hb_codepoint_t *b,
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void *user_data HB_UNUSED)
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{
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#if GLIB_CHECK_VERSION(2,29,12)
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return g_unichar_decompose (ab, a, b);
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#endif
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/* We don't ifdef-out the fallback code such that compiler always
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* sees it and makes sure it's compilable. */
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gchar utf8[6];
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gchar *normalized;
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int len;
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hb_bool_t ret;
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len = g_unichar_to_utf8 (ab, utf8);
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normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFD);
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len = g_utf8_strlen (normalized, -1);
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if (unlikely (!len))
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return false;
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if (len == 1) {
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*a = g_utf8_get_char (normalized);
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*b = 0;
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ret = *a != ab;
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} else if (len == 2) {
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*a = g_utf8_get_char (normalized);
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*b = g_utf8_get_char (g_utf8_next_char (normalized));
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/* Here's the ugly part: if ab decomposes to a single character and
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* that character decomposes again, we have to detect that and undo
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* the second part :-(. */
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gchar *recomposed = g_utf8_normalize (normalized, -1, G_NORMALIZE_NFC);
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hb_codepoint_t c = g_utf8_get_char (recomposed);
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if (c != ab && c != *a) {
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*a = c;
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*b = 0;
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}
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g_free (recomposed);
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ret = true;
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} else {
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/* If decomposed to more than two characters, take the last one,
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* and recompose the rest to get the first component. */
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gchar *end = g_utf8_offset_to_pointer (normalized, len - 1);
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gchar *recomposed;
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*b = g_utf8_get_char (end);
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recomposed = g_utf8_normalize (normalized, end - normalized, G_NORMALIZE_NFC);
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/* We expect that recomposed has exactly one character now. */
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*a = g_utf8_get_char (recomposed);
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g_free (recomposed);
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ret = true;
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}
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g_free (normalized);
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return ret;
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}
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static inline void free_static_glib_funcs ();
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static struct hb_glib_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_t<hb_glib_unicode_funcs_lazy_loader_t>
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{
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static hb_unicode_funcs_t *create ()
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{
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hb_unicode_funcs_t *funcs = hb_unicode_funcs_create (nullptr);
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hb_unicode_funcs_set_combining_class_func (funcs, hb_glib_unicode_combining_class, nullptr, nullptr);
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hb_unicode_funcs_set_general_category_func (funcs, hb_glib_unicode_general_category, nullptr, nullptr);
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hb_unicode_funcs_set_mirroring_func (funcs, hb_glib_unicode_mirroring, nullptr, nullptr);
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hb_unicode_funcs_set_script_func (funcs, hb_glib_unicode_script, nullptr, nullptr);
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hb_unicode_funcs_set_compose_func (funcs, hb_glib_unicode_compose, nullptr, nullptr);
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hb_unicode_funcs_set_decompose_func (funcs, hb_glib_unicode_decompose, nullptr, nullptr);
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hb_unicode_funcs_make_immutable (funcs);
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hb_atexit (free_static_glib_funcs);
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return funcs;
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}
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} static_glib_funcs;
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static inline
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void free_static_glib_funcs ()
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{
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static_glib_funcs.free_instance ();
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}
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/**
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* hb_glib_get_unicode_funcs:
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*
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* Fetches a Unicode-functions structure that is populated
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* with the appropriate GLib function for each method.
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*
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* Return value: (transfer none): a pointer to the #hb_unicode_funcs_t Unicode-functions structure
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*
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* Since: 0.9.38
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**/
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hb_unicode_funcs_t *
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hb_glib_get_unicode_funcs ()
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{
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return static_glib_funcs.get_unconst ();
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}
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#if GLIB_CHECK_VERSION(2,31,10)
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static void
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_hb_g_bytes_unref (void *data)
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{
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g_bytes_unref ((GBytes *) data);
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}
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/**
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* hb_glib_blob_create:
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* @gbytes: the GBytes structure to work upon
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*
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* Creates an #hb_blob_t blob from the specified
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* GBytes data structure.
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*
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* Return value: (transfer full): the new #hb_blob_t blob object
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*
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* Since: 0.9.38
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**/
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hb_blob_t *
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hb_glib_blob_create (GBytes *gbytes)
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{
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gsize size = 0;
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gconstpointer data = g_bytes_get_data (gbytes, &size);
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return hb_blob_create ((const char *) data,
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size,
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HB_MEMORY_MODE_READONLY,
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g_bytes_ref (gbytes),
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_hb_g_bytes_unref);
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}
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#endif
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#endif
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