Move Alternate Family Logic into separate header

Source/core/platform/graphics/AlternateFontFamily.h

Index: Source/core/platform/graphics/AlternateFontFamily.h
diff --git a/Source/core/platform/graphics/AlternateFontFamily.h b/Source/core/platform/graphics/AlternateFontFamily.h
new file mode 100644
index 0000000000000000000000000000000000000000..9a735c2370cb19db71ea7cdf35a28a8775bfc725
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+++ b/Source/core/platform/graphics/AlternateFontFamily.h
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
+ * Copyright (C) 2013 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:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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.
+ */
+
+#ifndef AlternateFontFamily_h
+#define AlternateFontFamily_h
+
+#include "core/platform/graphics/FontDescription.h"
+#include "wtf/text/AtomicString.h"
+
+namespace WebCore {
+
+// We currently do not support bitmap fonts on windows (with GDI_FONTS_ON_WINDOWS enabled).
+// Instead of trying to construct a bitmap font and then going down the fallback path map
+// certain common bitmap fonts to their truetype equivalent up front. This also allows the
+// GDI_FONTS_ON_WINDOWS disabled code path to match our current behavior.
+static const AtomicString& alternateFamilyNameAvoidingBitmapFonts(const AtomicString& familyName)
+{
+#if OS(WIN)
+    // On Windows, 'Courier New' (truetype font) is always present and
+    // 'Courier' is a bitmap font. On Mac on the other hand 'Courier' is
+    // a truetype font. Thus pages asking for Courier are better of
+    // using 'Courier New' on windows.
+    DEFINE_STATIC_LOCAL(AtomicString, courier, ("Courier", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, courierNew, ("Courier New", AtomicString::ConstructFromLiteral));
+    if (equalIgnoringCase(familyName, courier))
+        return courierNew;
+
+    // Alias 'MS Sans Serif' (bitmap font) -> 'Microsoft Sans Serif'
+    // (truetype font).
+    DEFINE_STATIC_LOCAL(AtomicString, msSans, ("MS Sans Serif", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, microsoftSans, ("Microsoft Sans Serif", AtomicString::ConstructFromLiteral));
+    if (equalIgnoringCase(familyName, msSans))
+        return microsoftSans;
+
+    // Alias 'MS Serif' (bitmap) -> 'Times New Roman' (truetype font).
+    // There's no 'Microsoft Sans Serif-equivalent' for Serif.
+    DEFINE_STATIC_LOCAL(AtomicString, msSerif, ("MS Serif", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, timesNewRoman, ("Times New Roman", AtomicString::ConstructFromLiteral));
+    if (equalIgnoringCase(familyName, msSerif))
+        return timesNewRoman;
+#endif
+
+    return emptyAtom;
+}
+
+static const AtomicString& alternateFamilyName(const AtomicString& familyName)
+{
+    // Alias Courier <-> Courier New
+    DEFINE_STATIC_LOCAL(AtomicString, courier, ("Courier", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, courierNew, ("Courier New", AtomicString::ConstructFromLiteral));
+    if (equalIgnoringCase(familyName, courier))
+        return courierNew;
+#if !OS(WIN)
+    // On Windows, Courier New (truetype font) is always present and
+    // Courier is a bitmap font. So, we don't want to map Courier New to
+    // Courier.
+    if (equalIgnoringCase(familyName, courierNew))
+        return courier;
+#endif
+
+    // Alias Times and Times New Roman.
+    DEFINE_STATIC_LOCAL(AtomicString, times, ("Times", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, timesNewRoman, ("Times New Roman", AtomicString::ConstructFromLiteral));
+    if (equalIgnoringCase(familyName, times))
+        return timesNewRoman;
+    if (equalIgnoringCase(familyName, timesNewRoman))
+        return times;
+
+    // Alias Arial and Helvetica
+    DEFINE_STATIC_LOCAL(AtomicString, arial, ("Arial", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, helvetica, ("Helvetica", AtomicString::ConstructFromLiteral));
+    if (equalIgnoringCase(familyName, arial))
+        return helvetica;
+    if (equalIgnoringCase(familyName, helvetica))
+        return arial;
+
+    return emptyAtom;
+}
+
+
+static const AtomicString getFallbackFontFamily(const FontDescription& description)
+{
+    DEFINE_STATIC_LOCAL(const AtomicString, sansStr, ("Sans", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, serifStr, ("Serif", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, monospaceStr, ("Monospace", AtomicString::ConstructFromLiteral));
+
+    switch (description.genericFamily()) {
+    case FontDescription::SerifFamily:
+        return serifStr;
+    case FontDescription::MonospaceFamily:
+        return monospaceStr;
+    case FontDescription::SansSerifFamily:
+        return sansStr;
+    default:
+        return AtomicString();
+    }
+}
+
+} // namespace WebCore
+
+#endif // AlternateFontFamily_h