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
35namespace WebCore {
36
37CSSSegmentedFontFace::CSSSegmentedFontFace(CSSFontSelector* fontSelector)
38    : m_fontSelector(fontSelector)
39{
40}
41
42CSSSegmentedFontFace::~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
50void 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
63bool 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
74void CSSSegmentedFontFace::fontLoaded(CSSFontFace*)
75{
76    pruneTable();
77}
78
79void CSSSegmentedFontFace::appendFontFace(PassRefPtr<CSSFontFace> fontFace)
80{
81    pruneTable();
82    fontFace->addedToSegmentedFontFace(this);
83    m_fontFaces.append(fontFace);
84}
85
86FontData* 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