150 lines
4.1 KiB
C++
150 lines
4.1 KiB
C++
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/*
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* Copyright © 2014 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 <stdlib.h>
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#include <stdio.h>
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#include "hb-fc.h"
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static hb_bool_t
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hb_fc_get_glyph (hb_font_t *font /*HB_UNUSED*/,
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void *font_data,
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hb_codepoint_t unicode,
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hb_codepoint_t variation_selector,
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hb_codepoint_t *glyph,
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void *user_data /*HB_UNUSED*/)
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{
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FcCharSet *cs = (FcCharSet *) font_data;
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if (variation_selector)
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{
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/* Fontconfig doesn't cache cmap-14 info. However:
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* 1. If the font maps the variation_selector, assume it's
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* supported,
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* 2. If the font doesn't map it, still say it's supported,
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* but return 0. This way, the caller will see the zero
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* and reject. If we return unsupported here, then the
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* variation selector will be hidden and ignored.
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*/
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if (FcCharSetHasChar (cs, unicode) &&
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FcCharSetHasChar (cs, variation_selector))
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{
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unsigned int var_num = 0;
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if (variation_selector - 0xFE00u < 16)
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var_num = variation_selector - 0xFE00 + 1;
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else if (variation_selector - 0xE0100u < (256 - 16))
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var_num = variation_selector - 0xE0100 + 17;
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*glyph = (var_num << 21) | unicode;
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}
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else
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{
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*glyph = 0;
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}
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return true;
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}
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*glyph = FcCharSetHasChar (cs, unicode) ? unicode : 0;
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return *glyph != 0;
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}
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static hb_font_funcs_t *
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_hb_fc_get_font_funcs (void)
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{
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static const hb_font_funcs_t *fc_ffuncs;
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const hb_font_funcs_t *ffuncs;
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if (!(ffuncs = fc_ffuncs))
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{
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hb_font_funcs_t *newfuncs = hb_font_funcs_create ();
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hb_font_funcs_set_glyph_func (newfuncs, hb_fc_get_glyph, nullptr, nullptr);
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/* XXX MT-unsafe */
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if (fc_ffuncs)
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hb_font_funcs_destroy (newfuncs);
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else
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fc_ffuncs = ffuncs = newfuncs;
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}
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return const_cast<hb_font_funcs_t *> (fc_ffuncs);
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}
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hb_font_t *
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hb_fc_font_create (FcPattern *fcfont)
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{
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static hb_face_t *face;
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hb_font_t *font;
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FcCharSet *cs;
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if (FcResultMatch != FcPatternGetCharSet (fcfont, FC_CHARSET, 0, &cs))
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return hb_font_get_empty ();
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if (!face) /* XXX MT-unsafe */
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face = hb_face_create (hb_blob_get_empty (), 0);
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font = hb_font_create (face);
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hb_font_set_funcs (font,
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_hb_fc_get_font_funcs (),
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FcCharSetCopy (cs),
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(hb_destroy_func_t) FcCharSetDestroy);
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return font;
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}
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hb_bool_t
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hb_fc_can_render (hb_font_t *font, const char *text)
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{
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static const char *ot[] = {"ot", nullptr};
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hb_buffer_t *buffer = hb_buffer_create ();
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hb_buffer_add_utf8 (buffer, text, -1, 0, -1);
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/* XXX Do we need this? I think Arabic and Hangul shapers are the
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* only one that make any use of this. The Hangul case is not really
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* needed, and for Arabic we'll miss a very narrow set of fonts.
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* Might be better to force generic shaper perhaps. */
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hb_buffer_guess_segment_properties (buffer);
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if (!hb_shape_full (font, buffer, nullptr, 0, ot))
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abort (); /* hb-ot shaper not enabled? */
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unsigned int len;
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &len);
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for (unsigned int i = 0; i < len; i++)
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{
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if (!info[i].codepoint)
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{
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return false;
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}
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}
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return true;
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}
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