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      1 /*
      2  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #include "config.h"
     23 #include "FontCustomPlatformData.h"
     24 
     25 #include "Base64.h"
     26 #include "CachedFont.h"
     27 #include "FontPlatformData.h"
     28 #include "SharedBuffer.h"
     29 #include <wtf/RandomNumber.h>
     30 
     31 namespace WebCore {
     32 
     33 static CustomFontCache* g_customFontCache = 0;
     34 
     35 bool renameFont(SharedBuffer* fontData, const String& fontName);
     36 
     37 void setCustomFontCache(CustomFontCache* cache)
     38 {
     39     g_customFontCache = cache;
     40 }
     41 
     42 FontCustomPlatformData::~FontCustomPlatformData()
     43 {
     44     if (g_customFontCache && !m_name.isEmpty())
     45         g_customFontCache->unregisterFont(m_name);
     46 }
     47 
     48 FontPlatformData FontCustomPlatformData::fontPlatformData(int size, bool bold, bool italic, FontOrientation, TextOrientation, FontWidthVariant, FontRenderingMode renderingMode)
     49 {
     50     FontDescription fontDesc;
     51     fontDesc.setComputedSize(size);
     52     fontDesc.setSpecifiedSize(size);
     53     fontDesc.setItalic(italic);
     54     fontDesc.setWeight(bold ? FontWeightBold : FontWeightNormal);
     55     return FontPlatformData(fontDesc, m_name, false);
     56 }
     57 
     58 // Creates a unique and unpredictable font name, in order to avoid collisions and to
     59 // not allow access from CSS.
     60 static String createUniqueFontName()
     61 {
     62     GUID fontUuid;
     63 
     64     unsigned int* ptr = reinterpret_cast<unsigned int*>(&fontUuid);
     65     for (int i = 0; i < sizeof(GUID) / sizeof(int) ; ++i)
     66         *(ptr + i) = static_cast<unsigned int>(randomNumber() * (std::numeric_limits<unsigned>::max() + 1.0));
     67 
     68     String fontName = base64Encode(reinterpret_cast<char*>(&fontUuid), sizeof(fontUuid));
     69     ASSERT(fontName.length() < LF_FACESIZE);
     70     return fontName.replace('/', '_');
     71 }
     72 
     73 FontCustomPlatformData* createFontCustomPlatformData(const SharedBuffer* buffer)
     74 {
     75     if (g_customFontCache) {
     76         String fontName = createUniqueFontName();
     77         RefPtr<SharedBuffer> localBuffer = SharedBuffer::create(buffer->data(), buffer->size());
     78         if (renameFont(localBuffer.get(), fontName) && g_customFontCache->registerFont(fontName, localBuffer.get()))
     79             return new FontCustomPlatformData(fontName);
     80     }
     81     return 0;
     82 }
     83 
     84 bool FontCustomPlatformData::supportsFormat(const String& format)
     85 {
     86     return equalIgnoringCase(format, "truetype") || equalIgnoringCase(format, "opentype");
     87 }
     88 
     89 }
     90