gr_segment.cpp (5547B)
1 /* GRAPHITE2 LICENSING 2 3 Copyright 2010, SIL International 4 All rights reserved. 5 6 This library is free software; you can redistribute it and/or modify 7 it under the terms of the GNU Lesser General Public License as published 8 by the Free Software Foundation; either version 2.1 of License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should also have received a copy of the GNU Lesser General Public 17 License along with this library in the file named "LICENSE". 18 If not, write to the Free Software Foundation, 51 Franklin Street, 19 Suite 500, Boston, MA 02110-1335, USA or visit their web page on the 20 internet at http://www.fsf.org/licenses/lgpl.html. 21 22 Alternatively, the contents of this file may be used under the terms of the 23 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public 24 License, as published by the Free Software Foundation, either version 2 25 of the License or (at your option) any later version. 26 */ 27 #include "graphite2/Segment.h" 28 #include "inc/UtfCodec.h" 29 #include "inc/Segment.h" 30 31 using namespace graphite2; 32 33 namespace 34 { 35 36 gr_segment* makeAndInitialize(const Font *font, const Face *face, uint32 script, const Features* pFeats/*must not be NULL*/, gr_encform enc, const void* pStart, size_t nChars, int dir) 37 { 38 if (script == 0x20202020) script = 0; 39 else if ((script & 0x00FFFFFF) == 0x00202020) script = script & 0xFF000000; 40 else if ((script & 0x0000FFFF) == 0x00002020) script = script & 0xFFFF0000; 41 else if ((script & 0x000000FF) == 0x00000020) script = script & 0xFFFFFF00; 42 // if (!font) return NULL; 43 Segment* pRes=new Segment(nChars, face, script, dir); 44 45 46 if (!pRes->read_text(face, pFeats, enc, pStart, nChars) || !pRes->runGraphite()) 47 { 48 delete pRes; 49 return NULL; 50 } 51 pRes->finalise(font, true); 52 53 return static_cast<gr_segment*>(pRes); 54 } 55 56 template <typename utf_iter> 57 inline size_t count_unicode_chars(utf_iter first, const utf_iter last, const void **error) 58 { 59 size_t n_chars = 0; 60 uint32 usv = 0; 61 62 if (last) 63 { 64 if (!first.validate(last)) 65 { 66 if (error) *error = last - 1; 67 return 0; 68 } 69 for (;first != last; ++first, ++n_chars) 70 if ((usv = *first) == 0 || first.error()) break; 71 } 72 else 73 { 74 while ((usv = *first) != 0 && !first.error()) 75 { 76 ++first; 77 ++n_chars; 78 } 79 } 80 81 if (error) *error = first.error() ? first : 0; 82 return n_chars; 83 } 84 } 85 86 87 extern "C" { 88 89 size_t gr_count_unicode_characters(gr_encform enc, const void* buffer_begin, const void* buffer_end/*don't go on or past end, If NULL then ignored*/, const void** pError) //Also stops on nul. Any nul is not in the count 90 { 91 assert(buffer_begin); 92 93 switch (enc) 94 { 95 case gr_utf8: return count_unicode_chars<utf8::const_iterator>(buffer_begin, buffer_end, pError); break; 96 case gr_utf16: return count_unicode_chars<utf16::const_iterator>(buffer_begin, buffer_end, pError); break; 97 case gr_utf32: return count_unicode_chars<utf32::const_iterator>(buffer_begin, buffer_end, pError); break; 98 default: return 0; 99 } 100 } 101 102 103 gr_segment* gr_make_seg(const gr_font *font, const gr_face *face, gr_uint32 script, const gr_feature_val* pFeats, gr_encform enc, const void* pStart, size_t nChars, int dir) 104 { 105 if (!face) return nullptr; 106 107 const gr_feature_val * tmp_feats = 0; 108 if (pFeats == 0) 109 pFeats = tmp_feats = static_cast<const gr_feature_val*>(face->theSill().cloneFeatures(0)); 110 gr_segment * seg = makeAndInitialize(font, face, script, pFeats, enc, pStart, nChars, dir); 111 delete static_cast<const FeatureVal*>(tmp_feats); 112 113 return seg; 114 } 115 116 117 void gr_seg_destroy(gr_segment* p) 118 { 119 delete static_cast<Segment*>(p); 120 } 121 122 123 float gr_seg_advance_X(const gr_segment* pSeg/*not NULL*/) 124 { 125 assert(pSeg); 126 return pSeg->advance().x; 127 } 128 129 130 float gr_seg_advance_Y(const gr_segment* pSeg/*not NULL*/) 131 { 132 assert(pSeg); 133 return pSeg->advance().y; 134 } 135 136 137 unsigned int gr_seg_n_cinfo(const gr_segment* pSeg/*not NULL*/) 138 { 139 assert(pSeg); 140 return static_cast<unsigned int>(pSeg->charInfoCount()); 141 } 142 143 144 const gr_char_info* gr_seg_cinfo(const gr_segment* pSeg/*not NULL*/, unsigned int index/*must be <number_of_CharInfo*/) 145 { 146 assert(pSeg); 147 return static_cast<const gr_char_info*>(pSeg->charinfo(index)); 148 } 149 150 unsigned int gr_seg_n_slots(const gr_segment* pSeg/*not NULL*/) 151 { 152 assert(pSeg); 153 return static_cast<unsigned int>(pSeg->slotCount()); 154 } 155 156 const gr_slot* gr_seg_first_slot(gr_segment* pSeg/*not NULL*/) 157 { 158 assert(pSeg); 159 return static_cast<const gr_slot*>(pSeg->first()); 160 } 161 162 const gr_slot* gr_seg_last_slot(gr_segment* pSeg/*not NULL*/) 163 { 164 assert(pSeg); 165 return static_cast<const gr_slot*>(pSeg->last()); 166 } 167 168 float gr_seg_justify(gr_segment* pSeg/*not NULL*/, const gr_slot* pSlot/*not NULL*/, const gr_font *pFont, double width, enum gr_justFlags flags, const gr_slot *pFirst, const gr_slot *pLast) 169 { 170 assert(pSeg); 171 assert(pSlot); 172 return pSeg->justify(const_cast<gr_slot *>(pSlot), pFont, float(width), justFlags(flags), const_cast<gr_slot *>(pFirst), const_cast<gr_slot *>(pLast)); 173 } 174 175 } // extern "C"