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 #include <sal/types.h>
  26 #include <osl/endian.h>
  27
  28 #ifdef WNT
  29 #include <windows.h>
  30 #endif
  31
  32 #include <graphite_features.hxx>
  33
  34 using namespace grutils;
  35 // These mustn't conflict with font name lists which use ; and ,
  36 const char GrFeatureParser::FEAT_PREFIX = ':';
  37 const char GrFeatureParser::FEAT_SEPARATOR = '&';
  38 const char GrFeatureParser::FEAT_ID_VALUE_SEPARATOR = '=';
  39
  40 GrFeatureParser::GrFeatureParser(const gr_face * pFace, const OString& lang)
  41     : mnNumSettings(0), mbErrors(false), mpSettings(NULL)
  42 {
  43     maLang.label[0] = maLang.label[1] = maLang.label[2] = maLang.label[3] = '\0';
  44     setLang(pFace, lang);
  45 }
  46
  47 GrFeatureParser::GrFeatureParser(const gr_face * pFace, const OString& features, const OString& lang)
  48     : mnNumSettings(0), mbErrors(false), mpSettings(NULL)
  49 {
  50     sal_Int32 nEquals = 0;
  51     sal_Int32 nFeatEnd = 0;
  52     sal_Int32 pos = 0;
  53     maLang.num = 0u;
  54     setLang(pFace, lang);
  55     while ((pos < features.getLength()) && (mnNumSettings < MAX_FEATURES))
  56     {
  57         nEquals = features.indexOf(FEAT_ID_VALUE_SEPARATOR, pos);
  58         if (nEquals == -1)
  59         {
  60             mbErrors = true;
  61             break;
  62         }
  63         // check for a lang=xxx specification
  64         const OString aLangPrefix("lang");
  65         if (features.match(aLangPrefix, pos ))
  66         {
  67             pos = nEquals + 1;
  68             nFeatEnd = features.indexOf(FEAT_SEPARATOR, pos);
  69             if (nFeatEnd == -1)
  70             {
  71                 nFeatEnd = features.getLength();
  72             }
  73             if (nFeatEnd - pos > 3)
  74                 mbErrors = true;
  75             else
  76             {
  77                 FeatId aLang = maLang;
  78                 aLang.num = 0;
  79                 for (sal_Int32 i = pos; i < nFeatEnd; i++)
  80                     aLang.label[i-pos] = features[i];
  81
  82                 //ext_std::pair<gr::LanguageIterator,gr::LanguageIterator> aSupported
  83                 //    = font.getSupportedLanguages();
  84                 //gr::LanguageIterator iL = aSupported.first;
  85                 unsigned short i = 0;
  86                 for (; i < gr_face_n_languages(pFace); i++)
  87                 {
  88                     gr_uint32 nFaceLang = gr_face_lang_by_index(pFace, i);
  89                     FeatId aSupportedLang;
  90                     aSupportedLang.num = nFaceLang;
  91 #ifdef OSL_BIGENDIAN
  92                     // here we only expect full 3 letter codes
  93                     if (aLang.label[0] == aSupportedLang.label[0] &&
  94                         aLang.label[1] == aSupportedLang.label[1] &&
  95                         aLang.label[2] == aSupportedLang.label[2] &&
  96                         aLang.label[3] == aSupportedLang.label[3])
  97 #else
  98                     if (aLang.label[0] == aSupportedLang.label[3] &&
  99                         aLang.label[1] == aSupportedLang.label[2] &&
 100                         aLang.label[2] == aSupportedLang.label[1] &&
 101                         aLang.label[3] == aSupportedLang.label[0])
 102 #endif
 103                     {
 104                         maLang = aSupportedLang;
 105                         break;
 106                     }
 107                 }
 108                 if (i == gr_face_n_languages(pFace)) mbErrors = true;
 109                 else
 110                 {
 111                     mnHash = maLang.num;
 112                     mpSettings = gr_face_featureval_for_lang(pFace, maLang.num);
 113                 }
 114             }
 115         }
 116         else
 117         {
 118             sal_uInt32 featId = 0;
 119             if (isCharId(features, pos, nEquals - pos))
 120             {
 121                 featId = getCharId(features, pos, nEquals - pos);
 122             }
 123             else
 124             {
 125                 featId = getIntValue(features, pos, nEquals - pos);
 126             }
 127             const gr_feature_ref * pFref = gr_face_find_fref(pFace, featId);
 128             pos = nEquals + 1;
 129             nFeatEnd = features.indexOf(FEAT_SEPARATOR, pos);
 130             if (nFeatEnd == -1)
 131             {
 132                 nFeatEnd = features.getLength();
 133             }
 134             sal_Int16 featValue = 0;
 135             featValue = getIntValue(features, pos, nFeatEnd - pos);
 136             if (pFref && gr_fref_set_feature_value(pFref, featValue, mpSettings))
 137             {
 138                 mnHash = (mnHash << 16) ^ ((featId << 8) | featValue);
 139                 mnNumSettings++;
 140             }
 141             else
 142                 mbErrors = true;
 143         }
 144         pos = nFeatEnd + 1;
 145     }
 146 }
 147
 148 void GrFeatureParser::setLang(const gr_face * pFace, const OString & lang)
 149 {
 150     FeatId aLang;
 151     aLang.num = 0;
 152     if (lang.getLength() >= 2)
 153     {
 154         for (sal_Int32 i = 0; i < lang.getLength() && i < 3; i++)
 155         {
 156             if (lang[i] == '-') break;
 157             aLang.label[i] = lang[i];
 158         }
 159         unsigned short i = 0;
 160         for (; i < gr_face_n_languages(pFace); i++)
 161         {
 162             gr_uint32 nFaceLang = gr_face_lang_by_index(pFace, i);
 163             FeatId aSupportedLang;
 164             aSupportedLang.num = nFaceLang;
 165             // here we only expect full 2 & 3 letter codes
 166 #ifdef OSL_BIGENDIAN
 167             if (aLang.label[0] == aSupportedLang.label[0] &&
 168                 aLang.label[1] == aSupportedLang.label[1] &&
 169                 aLang.label[2] == aSupportedLang.label[2] &&
 170                 aLang.label[3] == aSupportedLang.label[3])
 171 #else
 172             if (aLang.label[0] == aSupportedLang.label[3] &&
 173                 aLang.label[1] == aSupportedLang.label[2] &&
 174                 aLang.label[2] == aSupportedLang.label[1] &&
 175                 aLang.label[3] == aSupportedLang.label[0])
 176 #endif
 177             {
 178                 maLang = aSupportedLang;
 179                 break;
 180             }
 181         }
 182         if (i != gr_face_n_languages(pFace))
 183         {
 184             if (mpSettings)
 185                 gr_featureval_destroy(mpSettings);
 186             mpSettings = gr_face_featureval_for_lang(pFace, maLang.num);
 187             mnHash = maLang.num;
 188         }
 189     }
 190     if (!mpSettings)
 191         mpSettings = gr_face_featureval_for_lang(pFace, 0);
 192 }
 193
 194 GrFeatureParser::~GrFeatureParser()
 195 {
 196     if (mpSettings)
 197     {
 198         gr_featureval_destroy(mpSettings);
 199         mpSettings = NULL;
 200     }
 201 }
 202
 203 bool GrFeatureParser::isCharId(const OString & id, size_t offset, size_t length)
 204 {
 205     if (length > 4) return false;
 206     for (size_t i = 0; i < length; i++)
 207     {
 208         if (i > 0 && id[offset+i] == '\0') continue;
 209         if (id[offset+i] < 0x20 || static_cast<signed char>(id[offset+i]) < 0)
 210             return false;
 211         if (i==0 && (id[offset+i] < 0x41))
 212             return false;
 213     }
 214     return true;
 215 }
 216
 217 gr_uint32 GrFeatureParser::getCharId(const OString & id, size_t offset, size_t length)
 218 {
 219     FeatId charId;
 220     charId.num = 0;
 221 #ifdef OSL_BIGENDIAN
 222     for (size_t i = 0; i < length; i++)
 223     {
 224         charId.label[i] = id[offset+i];
 225     }
 226 #else
 227     for (size_t i = 0; i < length; i++)
 228     {
 229         charId.label[3-i] = id[offset+i];
 230     }
 231 #endif
 232     return charId.num;
 233 }
 234
 235 short GrFeatureParser::getIntValue(const OString & id, size_t offset, size_t length)
 236 {
 237     short value = 0;
 238     int sign = 1;
 239     for (size_t i = 0; i < length; i++)
 240     {
 241         switch (id[offset + i])
 242         {
 243         case '0':
 244         case '1':
 245         case '2':
 246         case '3':
 247         case '4':
 248         case '5':
 249         case '6':
 250         case '7':
 251         case '8':
 252         case '9':
 253             value *= 10;
 254             if (sign < 0)
 255             {
 256                 value = -(id[offset + i] - '0');
 257                 sign = 1;
 258             }
 259             value += (id[offset + i] - '0');
 260             break;
 261         case '-':
 262             if (i == 0)
 263                 sign = -1;
 264             else
 265             {
 266                 mbErrors = true;
 267                 break;
 268             }
 269         default:
 270             mbErrors = true;
 271             break;
 272         }
 273     }
 274     return value;
 275 }
 276
 277 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */