HarfBuzz text shaping engine
http://harfbuzz.github.io/
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147 lines
4.0 KiB
147 lines
4.0 KiB
/* |
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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 () |
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{ |
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static const hb_font_funcs_t *fc_ffuncs; |
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if (!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 = 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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