1/*
2 * Copyright (C) 2007, 2008, 2010 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 "CSSFontFaceSource.h"
28
29#include "CachedFont.h"
30#include "CSSFontFace.h"
31#include "CSSFontSelector.h"
32#include "CachedResourceLoader.h"
33#include "FontCache.h"
34#include "FontDescription.h"
35#include "GlyphPageTreeNode.h"
36#include "SimpleFontData.h"
37
38#if ENABLE(SVG_FONTS)
39#include "FontCustomPlatformData.h"
40#include "SVGFontData.h"
41#include "SVGFontElement.h"
42#include "SVGFontFaceElement.h"
43#include "SVGNames.h"
44#include "SVGURIReference.h"
45#endif
46
47namespace WebCore {
48
49CSSFontFaceSource::CSSFontFaceSource(const String& str, CachedFont* font)
50    : m_string(str)
51    , m_font(font)
52    , m_face(0)
53#if ENABLE(SVG_FONTS)
54    , m_hasExternalSVGFont(false)
55#endif
56{
57    if (m_font)
58        m_font->addClient(this);
59}
60
61CSSFontFaceSource::~CSSFontFaceSource()
62{
63    if (m_font)
64        m_font->removeClient(this);
65    pruneTable();
66}
67
68void CSSFontFaceSource::pruneTable()
69{
70    if (m_fontDataTable.isEmpty())
71        return;
72
73    HashMap<unsigned, SimpleFontData*>::iterator end = m_fontDataTable.end();
74    for (HashMap<unsigned, SimpleFontData*>::iterator it = m_fontDataTable.begin(); it != end; ++it)
75        m_face->retireCustomFont(it->second);
76
77    m_fontDataTable.clear();
78}
79
80bool CSSFontFaceSource::isLoaded() const
81{
82    if (m_font)
83        return m_font->isLoaded();
84    return true;
85}
86
87bool CSSFontFaceSource::isValid() const
88{
89    if (m_font)
90        return !m_font->errorOccurred();
91    return true;
92}
93
94void CSSFontFaceSource::fontLoaded(CachedFont*)
95{
96    pruneTable();
97    if (m_face)
98        m_face->fontLoaded(this);
99}
100
101SimpleFontData* CSSFontFaceSource::getFontData(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic, CSSFontSelector* fontSelector)
102{
103    // If the font hasn't loaded or an error occurred, then we've got nothing.
104    if (!isValid())
105        return 0;
106
107#if ENABLE(SVG_FONTS)
108    if (!m_font && !m_svgFontFaceElement) {
109#else
110    if (!m_font) {
111#endif
112        SimpleFontData* fontData = fontCache()->getCachedFontData(fontDescription, m_string);
113
114        // We're local. Just return a SimpleFontData from the normal cache.
115        return fontData;
116    }
117
118    // See if we have a mapping in our FontData cache.
119    unsigned hashKey = (fontDescription.computedPixelSize() + 1) << 6 | fontDescription.widthVariant() << 4
120                       | (fontDescription.textOrientation() == TextOrientationUpright ? 8 : 0) | (fontDescription.orientation() == Vertical ? 4 : 0) | (syntheticBold ? 2 : 0) | (syntheticItalic ? 1 : 0);
121    if (SimpleFontData* cachedData = m_fontDataTable.get(hashKey))
122        return cachedData;
123
124    OwnPtr<SimpleFontData> fontData;
125
126    // If we are still loading, then we let the system pick a font.
127    if (isLoaded()) {
128        if (m_font) {
129#if ENABLE(SVG_FONTS)
130            if (m_hasExternalSVGFont) {
131                // For SVG fonts parse the external SVG document, and extract the <font> element.
132                if (!m_font->ensureSVGFontData())
133                    return 0;
134
135                if (!m_externalSVGFontElement)
136                    m_externalSVGFontElement = m_font->getSVGFontById(SVGURIReference::getTarget(m_string));
137
138                if (!m_externalSVGFontElement)
139                    return 0;
140
141                SVGFontFaceElement* fontFaceElement = 0;
142
143                // Select first <font-face> child
144                for (Node* fontChild = m_externalSVGFontElement->firstChild(); fontChild; fontChild = fontChild->nextSibling()) {
145                    if (fontChild->hasTagName(SVGNames::font_faceTag)) {
146                        fontFaceElement = static_cast<SVGFontFaceElement*>(fontChild);
147                        break;
148                    }
149                }
150
151                if (fontFaceElement) {
152                    if (!m_svgFontFaceElement) {
153                        // We're created using a CSS @font-face rule, that means we're not associated with a SVGFontFaceElement.
154                        // Use the imported <font-face> tag as referencing font-face element for these cases.
155                        m_svgFontFaceElement = fontFaceElement;
156                    }
157
158                    fontData.set(new SimpleFontData(adoptPtr(new SVGFontData(fontFaceElement)), fontDescription.computedPixelSize(), syntheticBold, syntheticItalic));
159                }
160            } else
161#endif
162            {
163                // Create new FontPlatformData from our CGFontRef, point size and ATSFontRef.
164                if (!m_font->ensureCustomFontData())
165                    return 0;
166
167                fontData.set(new SimpleFontData(m_font->platformDataFromCustomData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic, fontDescription.orientation(),
168                                                                                   fontDescription.textOrientation(), fontDescription.widthVariant(), fontDescription.renderingMode()), true, false));
169            }
170        } else {
171#if ENABLE(SVG_FONTS)
172            // In-Document SVG Fonts
173            if (m_svgFontFaceElement)
174                fontData.set(new SimpleFontData(adoptPtr(new SVGFontData(m_svgFontFaceElement.get())), fontDescription.computedPixelSize(), syntheticBold, syntheticItalic));
175#endif
176        }
177    } else {
178        // Kick off the load now.
179        if (CachedResourceLoader* cachedResourceLoader = fontSelector->cachedResourceLoader())
180            m_font->beginLoadIfNeeded(cachedResourceLoader);
181        // FIXME: m_string is a URL so it makes no sense to pass it as a family name.
182        SimpleFontData* tempData = fontCache()->getCachedFontData(fontDescription, m_string);
183        if (!tempData)
184            tempData = fontCache()->getLastResortFallbackFont(fontDescription);
185
186        fontData.set(new SimpleFontData(tempData->platformData(), true, true));
187    }
188
189    SimpleFontData* fontDataRawPtr = fontData.leakPtr();
190    m_fontDataTable.set(hashKey, fontDataRawPtr);
191
192    return fontDataRawPtr;
193}
194
195#if ENABLE(SVG_FONTS)
196SVGFontFaceElement* CSSFontFaceSource::svgFontFaceElement() const
197{
198    return m_svgFontFaceElement.get();
199}
200
201void CSSFontFaceSource::setSVGFontFaceElement(PassRefPtr<SVGFontFaceElement> element)
202{
203    m_svgFontFaceElement = element;
204}
205
206bool CSSFontFaceSource::isSVGFontFaceSource() const
207{
208    return m_svgFontFaceElement || m_hasExternalSVGFont;
209}
210#endif
211
212}
213