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      1 /*
      2  * Copyright (C) 2013 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 "core/platform/graphics/FontCustomPlatformData.h"
     33 
     34 #include "core/platform/LayoutTestSupport.h"
     35 #include "core/platform/NotImplemented.h"
     36 #include "core/platform/SharedBuffer.h"
     37 #include "core/platform/graphics/FontPlatformData.h"
     38 #include "core/platform/graphics/opentype/OpenTypeSanitizer.h"
     39 #include "core/platform/graphics/opentype/OpenTypeUtilities.h"
     40 #include "wtf/PassOwnPtr.h"
     41 #include "wtf/RefPtr.h"
     42 #include "wtf/text/Base64.h"
     43 
     44 #include <objbase.h>
     45 
     46 namespace {
     47 
     48 // Creates a unique and unpredictable font name, in order to avoid collisions and to
     49 // not allow access from CSS.
     50 String createUniqueFontName()
     51 {
     52     GUID fontUuid;
     53     CoCreateGuid(&fontUuid);
     54 
     55     String fontName = base64Encode(reinterpret_cast<char*>(&fontUuid), sizeof(fontUuid));
     56     ASSERT(fontName.length() < LF_FACESIZE);
     57     return fontName;
     58 }
     59 
     60 } // namespace
     61 
     62 namespace WebCore {
     63 
     64 FontCustomPlatformData::FontCustomPlatformData(HANDLE fontReference, const String& name)
     65     : m_fontReference(fontReference)
     66     , m_name(name)
     67 {
     68 }
     69 
     70 FontCustomPlatformData::~FontCustomPlatformData()
     71 {
     72     if (m_fontReference)
     73         RemoveFontMemResourceEx(m_fontReference);
     74 }
     75 
     76 FontPlatformData FontCustomPlatformData::fontPlatformData(int size, bool bold, bool italic, FontOrientation orientation, FontWidthVariant)
     77 {
     78     ASSERT(m_fontReference);
     79 
     80     LOGFONT logFont;
     81     // m_name comes from createUniqueFontName, which, in turn, gets
     82     // it from base64-encoded uuid (128-bit). So, m_name
     83     // can never be longer than LF_FACESIZE (32).
     84     if (m_name.length() + 1 >= LF_FACESIZE) {
     85         ASSERT_NOT_REACHED();
     86         return FontPlatformData();
     87     }
     88     unsigned len = m_name.copyTo(logFont.lfFaceName, 0, LF_FACESIZE - 1);
     89     logFont.lfFaceName[len] = '\0';
     90 
     91     // FIXME: almost identical to FillLogFont in FontCacheWin.cpp.
     92     // Need to refactor.
     93     logFont.lfHeight = -size;
     94     logFont.lfWidth = 0;
     95     logFont.lfEscapement = 0;
     96     logFont.lfOrientation = 0;
     97     logFont.lfUnderline = false;
     98     logFont.lfStrikeOut = false;
     99     logFont.lfCharSet = DEFAULT_CHARSET;
    100     logFont.lfOutPrecision = OUT_TT_ONLY_PRECIS;
    101     logFont.lfQuality = isRunningLayoutTest() ? NONANTIALIASED_QUALITY : DEFAULT_QUALITY; // Honor user's desktop settings.
    102     logFont.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;
    103     logFont.lfItalic = italic;
    104     logFont.lfWeight = bold ? FW_BOLD : FW_DONTCARE;
    105 
    106     HFONT hfont = CreateFontIndirect(&logFont);
    107     return FontPlatformData(hfont, size, orientation);
    108 }
    109 
    110 PassOwnPtr<FontCustomPlatformData> FontCustomPlatformData::create(SharedBuffer* buffer)
    111 {
    112     ASSERT_ARG(buffer, buffer);
    113 
    114     OpenTypeSanitizer sanitizer(buffer);
    115     RefPtr<SharedBuffer> transcodeBuffer = sanitizer.sanitize();
    116     if (!transcodeBuffer)
    117         return nullptr; // validation failed.
    118     buffer = transcodeBuffer.get();
    119 
    120     // Introduce the font to GDI. AddFontMemResourceEx should be used with care, because it will pollute the process's
    121     // font namespace (Windows has no API for creating an HFONT from data without exposing the font to the
    122     // entire process first).
    123     String fontName = createUniqueFontName();
    124     HANDLE fontReference = renameAndActivateFont(buffer, fontName);
    125     if (!fontReference)
    126         return nullptr;
    127 
    128     return adoptPtr(new FontCustomPlatformData(fontReference, fontName));
    129 }
    130 
    131 bool FontCustomPlatformData::supportsFormat(const String& format)
    132 {
    133     return equalIgnoringCase(format, "truetype") || equalIgnoringCase(format, "opentype") || OpenTypeSanitizer::supportsFormat(format);
    134 }
    135 
    136 } // namespace WebCore
    137