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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 
CSSSegmentedFontFace(CSSFontSelector * fontSelector)37 CSSSegmentedFontFace::CSSSegmentedFontFace(CSSFontSelector* fontSelector)
38     : m_fontSelector(fontSelector)
39 {
40 }
41 
~CSSSegmentedFontFace()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 
pruneTable()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 
isValid() const63 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 
fontLoaded(CSSFontFace *)74 void CSSSegmentedFontFace::fontLoaded(CSSFontFace*)
75 {
76     pruneTable();
77 }
78 
appendFontFace(PassRefPtr<CSSFontFace> fontFace)79 void CSSSegmentedFontFace::appendFontFace(PassRefPtr<CSSFontFace> fontFace)
80 {
81     pruneTable();
82     fontFace->addedToSegmentedFontFace(this);
83     m_fontFaces.append(fontFace);
84 }
85 
getFontData(const FontDescription & fontDescription)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