1 files changed, 193 insertions, 0 deletions
diff --git a/chromium/third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp b/chromium/third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp
new file mode 100644
index 00000000000..5316a6ef55a
--- /dev/null
+++ b/chromium/third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp
@@ -0,0 +1,193 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/css/RemoteFontFaceSource.h"
+
+#include "core/css/CSSCustomFontData.h"
+#include "core/css/CSSFontFace.h"
+#include "core/css/FontLoader.h"
+#include "platform/fonts/FontCache.h"
+#include "platform/fonts/FontDescription.h"
+#include "platform/fonts/SimpleFontData.h"
+#include "public/platform/Platform.h"
+#include "wtf/CurrentTime.h"
+
+namespace WebCore {
+
+RemoteFontFaceSource::RemoteFontFaceSource(FontResource* font, PassRefPtrWillBeRawPtr<FontLoader> fontLoader)
+    : m_font(font)
+    , m_fontLoader(fontLoader)
+{
+    m_font->addClient(this);
+}
+
+RemoteFontFaceSource::~RemoteFontFaceSource()
+{
+    m_font->removeClient(this);
+    pruneTable();
+}
+
+void RemoteFontFaceSource::pruneTable()
+{
+    if (m_fontDataTable.isEmpty())
+        return;
+
+    for (FontDataTable::iterator it = m_fontDataTable.begin(); it != m_fontDataTable.end(); ++it) {
+        SimpleFontData* fontData = it->value.get();
+        if (fontData && fontData->customFontData())
+            fontData->customFontData()->clearFontFaceSource();
+    }
+    m_fontDataTable.clear();
+}
+
+bool RemoteFontFaceSource::isLoading() const
+{
+    return !m_font->stillNeedsLoad() && !m_font->isLoaded();
+}
+
+bool RemoteFontFaceSource::isLoaded() const
+{
+    return m_font->isLoaded();
+}
+
+bool RemoteFontFaceSource::isValid() const
+{
+    return !m_font->errorOccurred();
+}
+
+void RemoteFontFaceSource::didStartFontLoad(FontResource*)
+{
+    // We may send duplicated reports when multiple CSSFontFaceSource are
+    // registered at this FontResource. Associating the same URL to different
+    // font-family causes the case, but we treat them as indivisual resources.
+    m_histograms.loadStarted();
+}
+
+void RemoteFontFaceSource::fontLoaded(FontResource*)
+{
+    m_histograms.recordRemoteFont(m_font.get());
+
+    pruneTable();
+    if (m_face) {
+        m_fontLoader->fontFaceInvalidated();
+        m_face->fontLoaded(this);
+    }
+}
+
+void RemoteFontFaceSource::fontLoadWaitLimitExceeded(FontResource*)
+{
+    pruneTable();
+    if (m_face) {
+        m_fontLoader->fontFaceInvalidated();
+        m_face->fontLoadWaitLimitExceeded(this);
+    }
+
+    m_histograms.recordFallbackTime(m_font.get());
+}
+
+PassRefPtr<SimpleFontData> RemoteFontFaceSource::createFontData(const FontDescription& fontDescription)
+{
+    if (!isLoaded())
+        return createLoadingFallbackFontData(fontDescription);
+
+    // Create new FontPlatformData from our CGFontRef, point size and ATSFontRef.
+    if (!m_font->ensureCustomFontData())
+        return nullptr;
+
+    m_histograms.recordFallbackTime(m_font.get());
+
+    return SimpleFontData::create(
+        m_font->platformDataFromCustomData(fontDescription.effectiveFontSize(),
+            fontDescription.isSyntheticBold(), fontDescription.isSyntheticItalic(),
+            fontDescription.orientation(), fontDescription.widthVariant()), CustomFontData::create());
+}
+
+PassRefPtr<SimpleFontData> RemoteFontFaceSource::createLoadingFallbackFontData(const FontDescription& fontDescription)
+{
+    // This temporary font is not retained and should not be returned.
+    FontCachePurgePreventer fontCachePurgePreventer;
+    SimpleFontData* temporaryFont = FontCache::fontCache()->getNonRetainedLastResortFallbackFont(fontDescription);
+    if (!temporaryFont) {
+        ASSERT_NOT_REACHED();
+        return nullptr;
+    }
+    RefPtr<CSSCustomFontData> cssFontData = CSSCustomFontData::create(this, m_font->exceedsFontLoadWaitLimit() ? CSSCustomFontData::VisibleFallback : CSSCustomFontData::InvisibleFallback);
+    return SimpleFontData::create(temporaryFont->platformData(), cssFontData);
+}
+
+void RemoteFontFaceSource::beginLoadIfNeeded()
+{
+    if (m_font->stillNeedsLoad())
+        m_fontLoader->addFontToBeginLoading(m_font.get());
+
+    if (m_face)
+        m_face->didBeginLoad();
+}
+
+bool RemoteFontFaceSource::ensureFontData()
+{
+    return m_font->ensureCustomFontData();
+}
+
+void RemoteFontFaceSource::trace(Visitor* visitor)
+{
+    visitor->trace(m_fontLoader);
+    CSSFontFaceSource::trace(visitor);
+}
+
+void RemoteFontFaceSource::FontLoadHistograms::loadStarted()
+{
+    if (!m_loadStartTime)
+        m_loadStartTime = currentTimeMS();
+}
+
+void RemoteFontFaceSource::FontLoadHistograms::fallbackFontPainted()
+{
+    if (!m_fallbackPaintTime)
+        m_fallbackPaintTime = currentTimeMS();
+}
+
+void RemoteFontFaceSource::FontLoadHistograms::recordFallbackTime(const FontResource* font)
+{
+    if (m_fallbackPaintTime <= 0)
+        return;
+    int duration = static_cast<int>(currentTimeMS() - m_fallbackPaintTime);
+    blink::Platform::current()->histogramCustomCounts("WebFont.BlankTextShownTime", duration, 0, 10000, 50);
+    m_fallbackPaintTime = -1;
+}
+
+void RemoteFontFaceSource::FontLoadHistograms::recordRemoteFont(const FontResource* font)
+{
+    if (m_loadStartTime > 0 && font && !font->isLoading()) {
+        int duration = static_cast<int>(currentTimeMS() - m_loadStartTime);
+        blink::Platform::current()->histogramCustomCounts(histogramName(font), duration, 0, 10000, 50);
+        m_loadStartTime = -1;
+
+        enum { Miss, Hit, DataUrl, CacheHitEnumMax };
+        int histogramValue = font->url().protocolIsData() ? DataUrl
+            : font->response().wasCached() ? Hit
+            : Miss;
+        blink::Platform::current()->histogramEnumeration("WebFont.CacheHit", histogramValue, CacheHitEnumMax);
+    }
+}
+
+const char* RemoteFontFaceSource::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";
+}
+
+} // namespace WebCore