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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 
47 namespace WebCore {
48 
CSSFontFaceSource(const String & str,CachedFont * font)49 CSSFontFaceSource::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 
~CSSFontFaceSource()61 CSSFontFaceSource::~CSSFontFaceSource()
62 {
63     if (m_font)
64         m_font->removeClient(this);
65     pruneTable();
66 }
67 
pruneTable()68 void 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 
isLoaded() const80 bool CSSFontFaceSource::isLoaded() const
81 {
82     if (m_font)
83         return m_font->isLoaded();
84     return true;
85 }
86 
isValid() const87 bool CSSFontFaceSource::isValid() const
88 {
89     if (m_font)
90         return !m_font->errorOccurred();
91     return true;
92 }
93 
fontLoaded(CachedFont *)94 void CSSFontFaceSource::fontLoaded(CachedFont*)
95 {
96     pruneTable();
97     if (m_face)
98         m_face->fontLoaded(this);
99 }
100 
getFontData(const FontDescription & fontDescription,bool syntheticBold,bool syntheticItalic,CSSFontSelector * fontSelector)101 SimpleFontData* 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)
196 SVGFontFaceElement* CSSFontFaceSource::svgFontFaceElement() const
197 {
198     return m_svgFontFaceElement.get();
199 }
200 
201 void CSSFontFaceSource::setSVGFontFaceElement(PassRefPtr<SVGFontFaceElement> element)
202 {
203     m_svgFontFaceElement = element;
204 }
205 
206 bool CSSFontFaceSource::isSVGFontFaceSource() const
207 {
208     return m_svgFontFaceElement || m_hasExternalSVGFont;
209 }
210 #endif
211 
212 }
213