/platform/external/webkit/WebCore/css/CSSFontFaceSource.cpp

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