Remove support for loading remote font faces

sky/engine/core/css/RemoteFontFaceSource.cpp

-// 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 "sky/engine/core/css/RemoteFontFaceSource.h"
-
-#include "sky/engine/core/css/CSSCustomFontData.h"
-#include "sky/engine/core/css/CSSFontFace.h"
-#include "sky/engine/core/css/FontLoader.h"
-#include "sky/engine/platform/fonts/FontCache.h"
-#include "sky/engine/platform/fonts/FontDescription.h"
-#include "sky/engine/platform/fonts/SimpleFontData.h"
-#include "sky/engine/public/platform/Platform.h"
-#include "sky/engine/wtf/CurrentTime.h"
-
-namespace blink {
-
-RemoteFontFaceSource::RemoteFontFaceSource(FontResource* font, PassRefPtr<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::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);
-
-        enum { CORSFail, CORSSuccess, CORSEnumMax };
-        int corsValue = font->isCORSFailed() ? CORSFail : CORSSuccess;
-        blink::Platform::current()->histogramEnumeration("WebFont.CORSSuccess", corsValue, CORSEnumMax);
-    }
-}
-
-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 blink