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      1 /*
      2  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
      3  * Copyright (C) 2009 Maxime Simon <simon.maxime (at) gmail.com> All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1.  Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  * 2.  Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     15  *     its contributors may be used to endorse or promote products derived
     16  *     from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "config.h"
     31 #include "SimpleFontData.h"
     32 
     33 #include "FloatRect.h"
     34 #include "FontCache.h"
     35 #include "FontDescription.h"
     36 #include "NotImplemented.h"
     37 #include "TextEncoding.h"
     38 #include <wtf/text/CString.h>
     39 
     40 
     41 namespace WebCore {
     42 
     43 void SimpleFontData::platformInit()
     44 {
     45     const BFont* font = m_platformData.font();
     46     if (!font)
     47         return;
     48 
     49     font_height height;
     50     font->GetHeight(&height);
     51     m_fontMetrics.setAscent(height.ascent);
     52     m_fontMetrics.setDescent(height.descent);
     53     m_fontMetrics.setXHeight(height.ascent * 0.56f); // Hack taken from the win port.
     54     m_fontMetrics.setLineGap(height.leading);
     55     m_fontMetrics.setLineSpacing(lroundf(height.ascent) + lroundf(height.descent) + lroundf(height.leading));
     56 }
     57 
     58 void SimpleFontData::platformCharWidthInit()
     59 {
     60     m_avgCharWidth = 0.f;
     61     m_maxCharWidth = 0.f;
     62     initCharWidths();
     63 }
     64 
     65 void SimpleFontData::platformDestroy()
     66 {
     67 }
     68 
     69 SimpleFontData* SimpleFontData::scaledFontData(const FontDescription& fontDescription, float scaleFactor) const
     70 {
     71     FontDescription desc = FontDescription(fontDescription);
     72     desc.setSpecifiedSize(scaleFactor * fontDescription.computedSize());
     73     FontPlatformData fontPlatformData(desc, desc.family().family());
     74     return new SimpleFontData(fontPlatformData, isCustomFont(), false);
     75 }
     76 
     77 SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
     78 {
     79     if (!m_derivedFontData)
     80         m_derivedFontData = DerivedFontData::create(isCustomFont());
     81     if (!m_derivedFontData->smallCaps)
     82         m_derivedFontData->smallCaps = scaledFontData(fontDescription, .7);
     83 
     84     return m_derivedFontData->smallCaps.get();
     85 }
     86 
     87 SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
     88 {
     89     if (!m_derivedFontData)
     90         m_derivedFontData = DerivedFontData::create(isCustomFont());
     91     if (!m_derivedFontData->emphasisMark)
     92         m_derivedFontData->emphasisMark = scaledFontData(fontDescription, .5);
     93 
     94     return m_derivedFontData->emphasisMark.get();
     95 }
     96 
     97 bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
     98 {
     99     // FIXME: We will need to implement this to load non-ASCII encoding sites
    100     return true;
    101 }
    102 
    103 void SimpleFontData::determinePitch()
    104 {
    105     m_treatAsFixedPitch = m_platformData.font() && m_platformData.font()->IsFixed();
    106 }
    107 
    108 GlyphMetrics SimpleFontData::platformMetricsForGlyph(Glyph glyph, GlyphMetricsMode) const
    109 {
    110     GlyphMetrics metrics;
    111     if (!m_platformData.font())
    112         return metrics;
    113 
    114     CString encoded = UTF8Encoding().encode(static_cast<UChar*>(&glyph), 1,
    115                                             URLEncodedEntitiesForUnencodables);
    116     float escapements[1];
    117     m_platformData.font()->GetEscapements(encoded.data(), 1, escapements);
    118     metrics.horizontalAdvance = escapements[0] * m_platformData.font()->Size();
    119     return metrics;
    120 }
    121 
    122 } // namespace WebCore
    123 
    124