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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "WebFontInfo.h"
     33 
     34 #include <fontconfig/fontconfig.h>
     35 #include <string.h>
     36 #include <unicode/utf16.h>
     37 
     38 namespace WebKit {
     39 
     40 WebCString WebFontInfo::familyForChars(const WebUChar* characters, size_t numCharacters)
     41 {
     42     FcCharSet* cset = FcCharSetCreate();
     43     for (size_t i = 0; i < numCharacters; ++i) {
     44         if (U16_IS_SURROGATE(characters[i])
     45          && U16_IS_SURROGATE_LEAD(characters[i])
     46          && i != numCharacters - 1
     47          && U16_IS_TRAIL(characters[i + 1])) {
     48               FcCharSetAddChar(cset, U16_GET_SUPPLEMENTARY(characters[i], characters[i+1]));
     49           i++;
     50         } else
     51               FcCharSetAddChar(cset, characters[i]);
     52     }
     53     FcPattern* pattern = FcPatternCreate();
     54 
     55     FcValue fcvalue;
     56     fcvalue.type = FcTypeCharSet;
     57     fcvalue.u.c = cset;
     58     FcPatternAdd(pattern, FC_CHARSET, fcvalue, 0);
     59 
     60     fcvalue.type = FcTypeBool;
     61     fcvalue.u.b = FcTrue;
     62     FcPatternAdd(pattern, FC_SCALABLE, fcvalue, 0);
     63 
     64     FcConfigSubstitute(0, pattern, FcMatchPattern);
     65     FcDefaultSubstitute(pattern);
     66 
     67     FcResult result;
     68     FcFontSet* fontSet = FcFontSort(0, pattern, 0, 0, &result);
     69     FcPatternDestroy(pattern);
     70     FcCharSetDestroy(cset);
     71 
     72     if (!fontSet)
     73         return WebCString();
     74 
     75     // Older versions of fontconfig have a bug where they cannot select
     76     // only scalable fonts so we have to manually filter the results.
     77     for (int i = 0; i < fontSet->nfont; ++i) {
     78         FcPattern* current = fontSet->fonts[i];
     79         FcBool isScalable;
     80 
     81         if (FcPatternGetBool(current, FC_SCALABLE, 0, &isScalable) != FcResultMatch
     82             || !isScalable)
     83             continue;
     84 
     85         // fontconfig can also return fonts which are unreadable
     86         FcChar8* cFilename;
     87         if (FcPatternGetString(current, FC_FILE, 0, &cFilename) != FcResultMatch)
     88             continue;
     89 
     90         if (access(reinterpret_cast<char*>(cFilename), R_OK))
     91             continue;
     92 
     93         FcChar8* family;
     94         WebCString result;
     95         if (FcPatternGetString(current, FC_FAMILY, 0, &family) == FcResultMatch) {
     96             const char* charFamily = reinterpret_cast<char*>(family);
     97             result = WebCString(charFamily, strlen(charFamily));
     98         }
     99         FcFontSetDestroy(fontSet);
    100         return result;
    101     }
    102 
    103     FcFontSetDestroy(fontSet);
    104     return WebCString();
    105 }
    106 
    107 } // namespace WebKit
    108