vcl/source/glyphs/graphite_features.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 // Description:
  21 // Parse a string of features specified as & separated pairs.
  22 // e.g.
  23 // 1001=1&2002=2&fav1=0
  24
  25
  26 #include <sal/types.h>
  27 #include <osl/endian.h>
  28
  29 #ifdef WNT
  30 #include <windows.h>
  31 #endif
  32
  33 #include <graphite_features.hxx>
  34
  35 using namespace grutils;
  36 // These mustn't conflict with font name lists which use ; and ,
  37 const char GrFeatureParser::FEAT_PREFIX = ':';
  38 const char GrFeatureParser::FEAT_SEPARATOR = '&';
  39 const char GrFeatureParser::FEAT_ID_VALUE_SEPARATOR = '=';
  40
  41 GrFeatureParser::GrFeatureParser(const gr_face * pFace, const OString lang)
  42     : mnNumSettings(0), mbErrors(false), mpSettings(NULL)
  43 {
  44     maLang.label[0] = maLang.label[1] = maLang.label[2] = maLang.label[3] = '\0';
  45     setLang(pFace, lang);
  46 }
  47
  48 GrFeatureParser::GrFeatureParser(const gr_face * pFace, const OString features, const OString lang)
  49     : mnNumSettings(0), mbErrors(false), mpSettings(NULL)
  50 {
  51     sal_Int32 nEquals = 0;
  52     sal_Int32 nFeatEnd = 0;
  53     sal_Int32 pos = 0;
  54     maLang.num = 0u;
  55     setLang(pFace, lang);
  56     while ((pos < features.getLength()) && (mnNumSettings < MAX_FEATURES))
  57     {
  58         nEquals = features.indexOf(FEAT_ID_VALUE_SEPARATOR, pos);
  59         if (nEquals == -1)
  60         {
  61             mbErrors = true;
  62             break;
  63         }
  64         // check for a lang=xxx specification
  65         const OString aLangPrefix("lang");
  66         if (features.match(aLangPrefix, pos ))
  67         {
  68             pos = nEquals + 1;
  69             nFeatEnd = features.indexOf(FEAT_SEPARATOR, pos);
  70             if (nFeatEnd == -1)
  71             {
  72                 nFeatEnd = features.getLength();
  73             }
  74             if (nFeatEnd - pos > 3)
  75                 mbErrors = true;
  76             else
  77             {
  78                 FeatId aLang = maLang;
  79                 aLang.num = 0;
  80                 for (sal_Int32 i = pos; i < nFeatEnd; i++)
  81                     aLang.label[i-pos] = features[i];
  82
  83                 //ext_std::pair<gr::LanguageIterator,gr::LanguageIterator> aSupported
  84                 //    = font.getSupportedLanguages();
  85                 //gr::LanguageIterator iL = aSupported.first;
  86                 unsigned short i = 0;
  87                 for (; i < gr_face_n_languages(pFace); i++)
  88                 {
  89                     gr_uint32 nFaceLang = gr_face_lang_by_index(pFace, i);
  90                     FeatId aSupportedLang;
  91                     aSupportedLang.num = nFaceLang;
  92 #ifdef OSL_BIGENDIAN
  93                     // here we only expect full 3 letter codes
  94                     if (aLang.label[0] == aSupportedLang.label[0] &&
  95                         aLang.label[1] == aSupportedLang.label[1] &&
  96                         aLang.label[2] == aSupportedLang.label[2] &&
  97                         aLang.label[3] == aSupportedLang.label[3])
  98 #else
  99                     if (aLang.label[0] == aSupportedLang.label[3] &&
 100                         aLang.label[1] == aSupportedLang.label[2] &&
 101                         aLang.label[2] == aSupportedLang.label[1] &&
 102                         aLang.label[3] == aSupportedLang.label[0])
 103 #endif
 104                     {
 105                         maLang = aSupportedLang;
 106                         break;
 107                     }
 108                 }
 109                 if (i == gr_face_n_languages(pFace)) mbErrors = true;
 110                 else
 111                 {
 112                     mnHash = maLang.num;
 113                     mpSettings = gr_face_featureval_for_lang(pFace, maLang.num);
 114                 }
 115             }
 116         }
 117         else
 118         {
 119             sal_uInt32 featId = 0;
 120             if (isCharId(features, pos, nEquals - pos))
 121             {
 122                 featId = getCharId(features, pos, nEquals - pos);
 123             }
 124             else
 125             {
 126                 featId = getIntValue(features, pos, nEquals - pos);
 127             }
 128             const gr_feature_ref * pFref = gr_face_find_fref(pFace, featId);
 129             pos = nEquals + 1;
 130             nFeatEnd = features.indexOf(FEAT_SEPARATOR, pos);
 131             if (nFeatEnd == -1)
 132             {
 133                 nFeatEnd = features.getLength();
 134             }
 135             sal_Int16 featValue = 0;
 136             featValue = getIntValue(features, pos, nFeatEnd - pos);
 137             if (pFref && gr_fref_set_feature_value(pFref, featValue, mpSettings))
 138             {
 139                 mnHash = (mnHash << 16) ^ ((featId << 8) | featValue);
 140                 mnNumSettings++;
 141             }
 142             else
 143                 mbErrors = true;
 144         }
 145         pos = nFeatEnd + 1;
 146     }
 147 }
 148
 149 void GrFeatureParser::setLang(const gr_face * pFace, const OString & lang)
 150 {
 151     FeatId aLang;
 152     aLang.num = 0;
 153     if (lang.getLength() >= 2)
 154     {
 155         for (sal_Int32 i = 0; i < lang.getLength() && i < 3; i++)
 156         {
 157             if (lang[i] == '-') break;
 158             aLang.label[i] = lang[i];
 159         }
 160         unsigned short i = 0;
 161         for (; i < gr_face_n_languages(pFace); i++)
 162         {
 163             gr_uint32 nFaceLang = gr_face_lang_by_index(pFace, i);
 164             FeatId aSupportedLang;
 165             aSupportedLang.num = nFaceLang;
 166             // here we only expect full 2 & 3 letter codes
 167 #ifdef OSL_BIGENDIAN
 168             if (aLang.label[0] == aSupportedLang.label[0] &&
 169                 aLang.label[1] == aSupportedLang.label[1] &&
 170                 aLang.label[2] == aSupportedLang.label[2] &&
 171                 aLang.label[3] == aSupportedLang.label[3])
 172 #else
 173             if (aLang.label[0] == aSupportedLang.label[3] &&
 174                 aLang.label[1] == aSupportedLang.label[2] &&
 175                 aLang.label[2] == aSupportedLang.label[1] &&
 176                 aLang.label[3] == aSupportedLang.label[0])
 177 #endif
 178             {
 179                 maLang = aSupportedLang;
 180                 break;
 181             }
 182         }
 183         if (i != gr_face_n_languages(pFace))
 184         {
 185             if (mpSettings)
 186                 gr_featureval_destroy(mpSettings);
 187             mpSettings = gr_face_featureval_for_lang(pFace, maLang.num);
 188             mnHash = maLang.num;
 189         }
 190     }
 191     if (!mpSettings)
 192         mpSettings = gr_face_featureval_for_lang(pFace, 0);
 193 }
 194
 195 GrFeatureParser::~GrFeatureParser()
 196 {
 197     if (mpSettings)
 198     {
 199         gr_featureval_destroy(mpSettings);
 200         mpSettings = NULL;
 201     }
 202 }
 203
 204 bool GrFeatureParser::isCharId(const OString & id, size_t offset, size_t length)
 205 {
 206     if (length > 4) return false;
 207     for (size_t i = 0; i < length; i++)
 208     {
 209         if (i > 0 && id[offset+i] == '\0') continue;
 210         if ((id[offset+i] < 0x20) || (id[offset+i] < 0))
 211             return false;
 212         if (i==0 && (id[offset+i] < 0x41))
 213             return false;
 214     }
 215     return true;
 216 }
 217
 218 gr_uint32 GrFeatureParser::getCharId(const OString & id, size_t offset, size_t length)
 219 {
 220     FeatId charId;
 221     charId.num = 0;
 222 #ifdef OSL_BIGENDIAN
 223     for (size_t i = 0; i < length; i++)
 224     {
 225         charId.label[i] = id[offset+i];
 226     }
 227 #else
 228     for (size_t i = 0; i < length; i++)
 229     {
 230         charId.label[3-i] = id[offset+i];
 231     }
 232 #endif
 233     return charId.num;
 234 }
 235
 236 short GrFeatureParser::getIntValue(const OString & id, size_t offset, size_t length)
 237 {
 238     short value = 0;
 239     int sign = 1;
 240     for (size_t i = 0; i < length; i++)
 241     {
 242         switch (id[offset + i])
 243         {
 244         case '0':
 245         case '1':
 246         case '2':
 247         case '3':
 248         case '4':
 249         case '5':
 250         case '6':
 251         case '7':
 252         case '8':
 253         case '9':
 254             value *= 10;
 255             if (sign < 0)
 256             {
 257                 value = -(id[offset + i] - '0');
 258                 sign = 1;
 259             }
 260             value += (id[offset + i] - '0');
 261             break;
 262         case '-':
 263             if (i == 0)
 264                 sign = -1;
 265             else
 266             {
 267                 mbErrors = true;
 268                 break;
 269             }
 270         default:
 271             mbErrors = true;
 272             break;
 273         }
 274     }
 275     return value;
 276 }
 277
 278 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */