Linux: plumb fontconfig call out to the sandbox host.

webkit/api/src/gtk/WebFontInfo.cpp

+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebFontInfo.h"
+
+#include <string.h>
+
+#include <unicode/utf16.h>
+#include <fontconfig/fontconfig.h>
+
+namespace WebKit {
+
+WebString WebFontInfo::familyForChars(const WebUChar* characters, size_t numCharacters)
+{
+    FcCharSet* cset = FcCharSetCreate();
+    for (int i = 0; i < numCharacters; ++i) {
+        if (U16_IS_SURROGATE(characters[i])
+         && U16_IS_SURROGATE_LEAD(characters[i])
+         && i != numCharacters - 1
+         && U16_IS_TRAIL(characters[i + 1])) {
+              FcCharSetAddChar(cset, U16_GET_SUPPLEMENTARY(characters[i], characters[i+1]));
+          i++;
+        } else
+              FcCharSetAddChar(cset, characters[i]);
+    }
+    FcPattern* pattern = FcPatternCreate();
+
+    FcValue fcvalue;
+    fcvalue.type = FcTypeCharSet;
+    fcvalue.u.c = cset;
+    FcPatternAdd(pattern, FC_CHARSET, fcvalue, 0);
+
+    FcConfigSubstitute(0, pattern, FcMatchPattern);
+    FcDefaultSubstitute(pattern);
+
+    FcResult result;
+    FcPattern* match = FcFontMatch(0, pattern, &result);
+    FcPatternDestroy(pattern);
+    FcCharSetDestroy(cset);
+
+    if (match) {
+        FcChar8* family;
+        WebString result;
+        if (FcPatternGetString(match, FC_FAMILY, 0, &family) == FcResultMatch) {
+            const char* charFamily = reinterpret_cast<char*>(family);
+            result = WebString::fromUTF8(charFamily, strlen(charFamily));
+        }
+        FcPatternDestroy(match);
+        return result;
+    }
+
+    return WebString();
+}
+
+} // namespace WebKit