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() << 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 }