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      1 /*
      2  * Copyright (C) 2006 Apple Computer, 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
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "FontFallbackList.h"
     31 
     32 #include "Font.h"
     33 #include "FontCache.h"
     34 #include "SegmentedFontData.h"
     35 
     36 namespace WebCore {
     37 
     38 FontFallbackList::FontFallbackList()
     39     : m_pageZero(0)
     40     , m_cachedPrimarySimpleFontData(0)
     41     , m_fontSelector(0)
     42     , m_familyIndex(0)
     43     , m_pitch(UnknownPitch)
     44     , m_loadingCustomFonts(false)
     45     , m_generation(fontCache()->generation())
     46 {
     47 }
     48 
     49 void FontFallbackList::invalidate(PassRefPtr<FontSelector> fontSelector)
     50 {
     51     releaseFontData();
     52     m_fontList.clear();
     53     m_pageZero = 0;
     54     m_pages.clear();
     55     m_cachedPrimarySimpleFontData = 0;
     56     m_familyIndex = 0;
     57     m_pitch = UnknownPitch;
     58     m_loadingCustomFonts = false;
     59     m_fontSelector = fontSelector;
     60     m_generation = fontCache()->generation();
     61 }
     62 
     63 void FontFallbackList::releaseFontData()
     64 {
     65     unsigned numFonts = m_fontList.size();
     66     for (unsigned i = 0; i < numFonts; ++i) {
     67         if (!m_fontList[i].second) {
     68             ASSERT(!m_fontList[i].first->isSegmented());
     69             fontCache()->releaseFontData(static_cast<const SimpleFontData*>(m_fontList[i].first));
     70         }
     71     }
     72 }
     73 
     74 void FontFallbackList::determinePitch(const Font* font) const
     75 {
     76     const FontData* fontData = primaryFontData(font);
     77     if (!fontData->isSegmented())
     78         m_pitch = static_cast<const SimpleFontData*>(fontData)->pitch();
     79     else {
     80         const SegmentedFontData* segmentedFontData = static_cast<const SegmentedFontData*>(fontData);
     81         unsigned numRanges = segmentedFontData->numRanges();
     82         if (numRanges == 1)
     83             m_pitch = segmentedFontData->rangeAt(0).fontData()->pitch();
     84         else
     85             m_pitch = VariablePitch;
     86     }
     87 }
     88 
     89 const FontData* FontFallbackList::fontDataAt(const Font* font, unsigned realizedFontIndex) const
     90 {
     91     if (realizedFontIndex < m_fontList.size())
     92         return m_fontList[realizedFontIndex].first; // This fallback font is already in our list.
     93 
     94     // Make sure we're not passing in some crazy value here.
     95     ASSERT(realizedFontIndex == m_fontList.size());
     96 
     97     if (m_familyIndex == cAllFamiliesScanned)
     98         return 0;
     99 
    100     // Ask the font cache for the font data.
    101     // We are obtaining this font for the first time.  We keep track of the families we've looked at before
    102     // in |m_familyIndex|, so that we never scan the same spot in the list twice.  getFontData will adjust our
    103     // |m_familyIndex| as it scans for the right font to make.
    104     ASSERT(fontCache()->generation() == m_generation);
    105     const FontData* result = fontCache()->getFontData(*font, m_familyIndex, m_fontSelector.get());
    106     if (result) {
    107         m_fontList.append(pair<const FontData*, bool>(result, result->isCustomFont()));
    108         if (result->isLoading())
    109             m_loadingCustomFonts = true;
    110     }
    111     return result;
    112 }
    113 
    114 void FontFallbackList::setPlatformFont(const FontPlatformData& platformData)
    115 {
    116     m_familyIndex = cAllFamiliesScanned;
    117     ASSERT(fontCache()->generation() == m_generation);
    118     const FontData* fontData = fontCache()->getCachedFontData(&platformData);
    119     m_fontList.append(pair<const FontData*, bool>(fontData, fontData->isCustomFont()));
    120 }
    121 
    122 }
    123