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      1 /*
      2  * Copyright (C) 2008 Apple 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  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "CSSSegmentedFontFace.h"
     28 
     29 #include "CSSFontFace.h"
     30 #include "CSSFontSelector.h"
     31 #include "FontDescription.h"
     32 #include "SegmentedFontData.h"
     33 #include "SimpleFontData.h"
     34 
     35 namespace WebCore {
     36 
     37 CSSSegmentedFontFace::CSSSegmentedFontFace(CSSFontSelector* fontSelector)
     38     : m_fontSelector(fontSelector)
     39 {
     40 }
     41 
     42 CSSSegmentedFontFace::~CSSSegmentedFontFace()
     43 {
     44     pruneTable();
     45     unsigned size = m_fontFaces.size();
     46     for (unsigned i = 0; i < size; i++)
     47         m_fontFaces[i]->removedFromSegmentedFontFace(this);
     48 }
     49 
     50 void CSSSegmentedFontFace::pruneTable()
     51 {
     52     // Make sure the glyph page tree prunes out all uses of this custom font.
     53     if (m_fontDataTable.isEmpty())
     54         return;
     55 
     56     HashMap<unsigned, SegmentedFontData*>::iterator end = m_fontDataTable.end();
     57     for (HashMap<unsigned, SegmentedFontData*>::iterator it = m_fontDataTable.begin(); it != end; ++it)
     58         m_fontSelector->retireCustomFont(it->second);
     59 
     60     m_fontDataTable.clear();
     61 }
     62 
     63 bool CSSSegmentedFontFace::isValid() const
     64 {
     65     // Valid if at least one font face is valid.
     66     unsigned size = m_fontFaces.size();
     67     for (unsigned i = 0; i < size; i++) {
     68         if (m_fontFaces[i]->isValid())
     69             return true;
     70     }
     71     return false;
     72 }
     73 
     74 void CSSSegmentedFontFace::fontLoaded(CSSFontFace*)
     75 {
     76     pruneTable();
     77 }
     78 
     79 void CSSSegmentedFontFace::appendFontFace(PassRefPtr<CSSFontFace> fontFace)
     80 {
     81     pruneTable();
     82     fontFace->addedToSegmentedFontFace(this);
     83     m_fontFaces.append(fontFace);
     84 }
     85 
     86 FontData* CSSSegmentedFontFace::getFontData(const FontDescription& fontDescription)
     87 {
     88     if (!isValid())
     89         return 0;
     90 
     91     FontTraitsMask desiredTraitsMask = fontDescription.traitsMask();
     92     unsigned hashKey = ((fontDescription.computedPixelSize() + 1) << (FontTraitsMaskWidth + 1)) | ((fontDescription.orientation() == Vertical ? 1 : 0) << FontTraitsMaskWidth) | desiredTraitsMask;
     93 
     94     SegmentedFontData* fontData = m_fontDataTable.get(hashKey);
     95     if (fontData)
     96         return fontData;
     97 
     98     fontData = new SegmentedFontData();
     99 
    100     unsigned size = m_fontFaces.size();
    101     for (unsigned i = 0; i < size; i++) {
    102         if (!m_fontFaces[i]->isValid())
    103             continue;
    104         FontTraitsMask traitsMask = m_fontFaces[i]->traitsMask();
    105         bool syntheticBold = !(traitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask)) && (desiredTraitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask));
    106         bool syntheticItalic = !(traitsMask & FontStyleItalicMask) && (desiredTraitsMask & FontStyleItalicMask);
    107         if (const SimpleFontData* faceFontData = m_fontFaces[i]->getFontData(fontDescription, syntheticBold, syntheticItalic)) {
    108             ASSERT(!faceFontData->isSegmented());
    109             const Vector<CSSFontFace::UnicodeRange>& ranges = m_fontFaces[i]->ranges();
    110             unsigned numRanges = ranges.size();
    111             if (!numRanges)
    112                 fontData->appendRange(FontDataRange(0, 0x7FFFFFFF, faceFontData));
    113             else {
    114                 for (unsigned j = 0; j < numRanges; ++j)
    115                     fontData->appendRange(FontDataRange(ranges[j].from(), ranges[j].to(), faceFontData));
    116             }
    117         }
    118     }
    119     if (fontData->numRanges())
    120         m_fontDataTable.set(hashKey, fontData);
    121     else {
    122         delete fontData;
    123         fontData = 0;
    124     }
    125 
    126     return fontData;
    127 }
    128 
    129 }
    130