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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     HashMap<unsigned, SegmentedFontData*>::iterator end = m_fontDataTable.end();
     56     for (HashMap<unsigned, SegmentedFontData*>::iterator it = m_fontDataTable.begin(); it != end; ++it)
     57         GlyphPageTreeNode::pruneTreeCustomFontData(it->second);
     58     deleteAllValues(m_fontDataTable);
     59     m_fontDataTable.clear();
     60 }
     61 
     62 bool CSSSegmentedFontFace::isValid() const
     63 {
     64     // Valid if at least one font face is valid.
     65     unsigned size = m_fontFaces.size();
     66     for (unsigned i = 0; i < size; i++) {
     67         if (m_fontFaces[i]->isValid())
     68             return true;
     69     }
     70     return false;
     71 }
     72 
     73 void CSSSegmentedFontFace::fontLoaded(CSSFontFace*)
     74 {
     75     pruneTable();
     76 }
     77 
     78 void CSSSegmentedFontFace::appendFontFace(PassRefPtr<CSSFontFace> fontFace)
     79 {
     80     pruneTable();
     81     fontFace->addedToSegmentedFontFace(this);
     82     m_fontFaces.append(fontFace);
     83 }
     84 
     85 FontData* CSSSegmentedFontFace::getFontData(const FontDescription& fontDescription)
     86 {
     87     if (!isValid())
     88         return 0;
     89 
     90     FontTraitsMask desiredTraitsMask = fontDescription.traitsMask();
     91     unsigned hashKey = ((fontDescription.computedPixelSize() + 1) << (FontTraitsMaskWidth + 1)) | ((fontDescription.orientation() == Vertical ? 1 : 0) << FontTraitsMaskWidth) | desiredTraitsMask;
     92 
     93     SegmentedFontData* fontData = m_fontDataTable.get(hashKey);
     94     if (fontData)
     95         return fontData;
     96 
     97     fontData = new SegmentedFontData();
     98 
     99     unsigned size = m_fontFaces.size();
    100     for (unsigned i = 0; i < size; i++) {
    101         if (!m_fontFaces[i]->isValid())
    102             continue;
    103         FontTraitsMask traitsMask = m_fontFaces[i]->traitsMask();
    104         bool syntheticBold = !(traitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask)) && (desiredTraitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask));
    105         bool syntheticItalic = !(traitsMask & FontStyleItalicMask) && (desiredTraitsMask & FontStyleItalicMask);
    106         if (const SimpleFontData* faceFontData = m_fontFaces[i]->getFontData(fontDescription, syntheticBold, syntheticItalic)) {
    107             ASSERT(!faceFontData->isSegmented());
    108             const Vector<CSSFontFace::UnicodeRange>& ranges = m_fontFaces[i]->ranges();
    109             unsigned numRanges = ranges.size();
    110             if (!numRanges)
    111                 fontData->appendRange(FontDataRange(0, 0x7FFFFFFF, faceFontData));
    112             else {
    113                 for (unsigned j = 0; j < numRanges; ++j)
    114                     fontData->appendRange(FontDataRange(ranges[j].from(), ranges[j].to(), faceFontData));
    115             }
    116         }
    117     }
    118     if (fontData->numRanges())
    119         m_fontDataTable.set(hashKey, fontData);
    120     else {
    121         delete fontData;
    122         fontData = 0;
    123     }
    124 
    125     return fontData;
    126 }
    127 
    128 }
    129