Initial import.

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diff --git a/chromium/third_party/WebKit/Source/core/css/CSSFontFaceSource.cpp b/chromium/third_party/WebKit/Source/core/css/CSSFontFaceSource.cpp
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+/*
+ * Copyright (C) 2007, 2008, 2010, 2011 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/css/CSSFontFaceSource.h"
+
+#include "core/css/CSSFontFace.h"
+#include "core/css/CSSFontSelector.h"
+#include "core/fetch/FontResource.h"
+#include "core/platform/HistogramSupport.h"
+#include "core/platform/graphics/FontCache.h"
+#include "core/platform/graphics/FontDescription.h"
+#include "core/platform/graphics/SimpleFontData.h"
+#include "wtf/CurrentTime.h"
+
+#if ENABLE(SVG_FONTS)
+#include "SVGNames.h"
+#include "core/svg/SVGFontData.h"
+#include "core/svg/SVGFontElement.h"
+#include "core/svg/SVGFontFaceElement.h"
+#endif
+
+namespace WebCore {
+
+CSSFontFaceSource::CSSFontFaceSource(const String& str, FontResource* font)
+    : m_string(str)
+    , m_font(font)
+    , m_face(0)
+#if ENABLE(SVG_FONTS)
+    , m_hasExternalSVGFont(false)
+#endif
+{
+    if (m_font)
+        m_font->addClient(this);
+}
+
+CSSFontFaceSource::~CSSFontFaceSource()
+{
+    if (m_font)
+        m_font->removeClient(this);
+    pruneTable();
+}
+
+void CSSFontFaceSource::pruneTable()
+{
+    if (m_fontDataTable.isEmpty())
+        return;
+
+    m_fontDataTable.clear();
+}
+
+bool CSSFontFaceSource::isLoaded() const
+{
+    if (m_font)
+        return m_font->isLoaded();
+    return true;
+}
+
+bool CSSFontFaceSource::isValid() const
+{
+    if (m_font)
+        return !m_font->errorOccurred();
+    return true;
+}
+
+void CSSFontFaceSource::didStartFontLoad(FontResource*)
+{
+    // Avoid duplicated reports when multiple CSSFontFaceSource are registered
+    // at this FontResource.
+    if (!m_fontDataTable.isEmpty())
+        m_histograms.loadStarted();
+}
+
+void CSSFontFaceSource::fontLoaded(FontResource*)
+{
+    if (!m_fontDataTable.isEmpty())
+        m_histograms.recordRemoteFont(m_font.get());
+
+    pruneTable();
+    if (m_face)
+        m_face->fontLoaded(this);
+}
+
+PassRefPtr<SimpleFontData> CSSFontFaceSource::getFontData(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic, CSSFontSelector* fontSelector)
+{
+    // If the font hasn't loaded or an error occurred, then we've got nothing.
+    if (!isValid())
+        return 0;
+
+    if (!m_font
+#if ENABLE(SVG_FONTS)
+            && !m_svgFontFaceElement
+#endif
+    ) {
+        // We're local. Just return a SimpleFontData from the normal cache.
+        // We don't want to check alternate font family names here, so pass true as the checkingAlternateName parameter.
+        RefPtr<SimpleFontData> fontData = fontCache()->getFontResourceData(fontDescription, m_string, true);
+        m_histograms.recordLocalFont(fontData);
+        return fontData;
+    }
+
+    // See if we have a mapping in our FontData cache.
+    unsigned hashKey = (fontDescription.computedPixelSize() + 1) << 5 | fontDescription.widthVariant() << 3
+                       | (fontDescription.orientation() == Vertical ? 4 : 0) | (syntheticBold ? 2 : 0) | (syntheticItalic ? 1 : 0);
+
+    RefPtr<SimpleFontData>& fontData = m_fontDataTable.add(hashKey, 0).iterator->value;
+    if (fontData)
+        return fontData; // No release, because fontData is a reference to a RefPtr that is held in the m_fontDataTable.
+
+    // If we are still loading, then we let the system pick a font.
+    if (isLoaded()) {
+        if (m_font) {
+#if ENABLE(SVG_FONTS)
+            if (m_hasExternalSVGFont) {
+                // For SVG fonts parse the external SVG document, and extract the <font> element.
+                if (!m_font->ensureSVGFontData())
+                    return 0;
+
+                if (!m_externalSVGFontElement) {
+                    String fragmentIdentifier;
+                    size_t start = m_string.find('#');
+                    if (start != notFound)
+                        fragmentIdentifier = m_string.string().substring(start + 1);
+                    m_externalSVGFontElement = m_font->getSVGFontById(fragmentIdentifier);
+                }
+
+                if (!m_externalSVGFontElement)
+                    return 0;
+
+                SVGFontFaceElement* fontFaceElement = 0;
+
+                // Select first <font-face> child
+                for (Node* fontChild = m_externalSVGFontElement->firstChild(); fontChild; fontChild = fontChild->nextSibling()) {
+                    if (fontChild->hasTagName(SVGNames::font_faceTag)) {
+                        fontFaceElement = toSVGFontFaceElement(fontChild);
+                        break;
+                    }
+                }
+
+                if (fontFaceElement) {
+                    if (!m_svgFontFaceElement) {
+                        // We're created using a CSS @font-face rule, that means we're not associated with a SVGFontFaceElement.
+                        // Use the imported <font-face> tag as referencing font-face element for these cases.
+                        m_svgFontFaceElement = fontFaceElement;
+                    }
+
+                    fontData = SimpleFontData::create(SVGFontData::create(fontFaceElement), fontDescription.computedPixelSize(), syntheticBold, syntheticItalic);
+                }
+            } else
+#endif
+            {
+                // Create new FontPlatformData from our CGFontRef, point size and ATSFontRef.
+                if (!m_font->ensureCustomFontData())
+                    return 0;
+
+                fontData = SimpleFontData::create(m_font->platformDataFromCustomData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic,
+                    fontDescription.orientation(), fontDescription.widthVariant()), true, false);
+            }
+        } else {
+#if ENABLE(SVG_FONTS)
+            // In-Document SVG Fonts
+            if (m_svgFontFaceElement)
+                fontData = SimpleFontData::create(SVGFontData::create(m_svgFontFaceElement.get()), fontDescription.computedPixelSize(), syntheticBold, syntheticItalic);
+#endif
+        }
+    } else {
+        // Kick off the load. Do it soon rather than now, because we may be in the middle of layout,
+        // and the loader may invoke arbitrary delegate or event handler code.
+        fontSelector->beginLoadingFontSoon(m_font.get());
+
+        // This temporary font is not retained and should not be returned.
+        FontCachePurgePreventer fontCachePurgePreventer;
+        SimpleFontData* temporaryFont = fontCache()->getNonRetainedLastResortFallbackFont(fontDescription);
+        fontData = SimpleFontData::create(temporaryFont->platformData(), true, true);
+    }
+
+    return fontData; // No release, because fontData is a reference to a RefPtr that is held in the m_fontDataTable.
+}
+
+#if ENABLE(SVG_FONTS)
+SVGFontFaceElement* CSSFontFaceSource::svgFontFaceElement() const
+{
+    return m_svgFontFaceElement.get();
+}
+
+void CSSFontFaceSource::setSVGFontFaceElement(PassRefPtr<SVGFontFaceElement> element)
+{
+    m_svgFontFaceElement = element;
+}
+
+bool CSSFontFaceSource::isSVGFontFaceSource() const
+{
+    return m_svgFontFaceElement || m_hasExternalSVGFont;
+}
+#endif
+
+bool CSSFontFaceSource::isDecodeError() const
+{
+    if (m_font)
+        return m_font->status() == Resource::DecodeError;
+    return false;
+}
+
+bool CSSFontFaceSource::ensureFontData()
+{
+    if (!m_font)
+        return false;
+#if ENABLE(SVG_FONTS)
+    if (m_hasExternalSVGFont)
+        return m_font->ensureSVGFontData();
+#endif
+    return m_font->ensureCustomFontData();
+}
+
+void CSSFontFaceSource::FontLoadHistograms::loadStarted()
+{
+    if (!m_loadStartTime)
+        m_loadStartTime = currentTimeMS();
+}
+
+void CSSFontFaceSource::FontLoadHistograms::recordLocalFont(bool loadSuccess)
+{
+    if (!m_loadStartTime) {
+        HistogramSupport::histogramEnumeration("WebFont.LocalFontUsed", loadSuccess ? 1 : 0, 2);
+        m_loadStartTime = -1; // Do not count this font again.
+    }
+}
+
+void CSSFontFaceSource::FontLoadHistograms::recordRemoteFont(const FontResource* font)
+{
+    if (m_loadStartTime > 0 && font && !font->isLoading()) {
+        int duration = static_cast<int>(currentTimeMS() - m_loadStartTime);
+        HistogramSupport::histogramCustomCounts(histogramName(font), duration, 0, 10000, 50);
+        m_loadStartTime = -1;
+    }
+}
+
+const char* CSSFontFaceSource::FontLoadHistograms::histogramName(const FontResource* font)
+{
+    if (font->errorOccurred())
+        return "WebFont.DownloadTime.LoadError";
+
+    unsigned size = font->encodedSize();
+    if (size < 10 * 1024)
+        return "WebFont.DownloadTime.0.Under10KB";
+    if (size < 50 * 1024)
+        return "WebFont.DownloadTime.1.10KBTo50KB";
+    if (size < 100 * 1024)
+        return "WebFont.DownloadTime.2.50KBTo100KB";
+    if (size < 1024 * 1024)
+        return "WebFont.DownloadTime.3.100KBTo1MB";
+    return "WebFont.DownloadTime.4.Over1MB";
+}
+
+}