| /* |
| * Copyright (C) 2007-2021 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 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 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 "CSSFontFace.h" |
| |
| #include "CSSFontFaceSource.h" |
| #include "CSSFontFaceSrcValue.h" |
| #include "CSSFontFeatureValue.h" |
| #include "CSSFontSelector.h" |
| #include "CSSFontStyleRangeValue.h" |
| #include "CSSPrimitiveValueMappings.h" |
| #include "CSSUnicodeRangeValue.h" |
| #include "CSSValue.h" |
| #include "CSSValueList.h" |
| #include "CachedFont.h" |
| #include "Document.h" |
| #include "Font.h" |
| #include "FontCache.h" |
| #include "FontDescription.h" |
| #include "FontFace.h" |
| #include "FontPaletteValues.h" |
| #include "Settings.h" |
| #include "SharedBuffer.h" |
| #include "StyleBuilderConverter.h" |
| #include "StyleProperties.h" |
| #include "StyleRule.h" |
| |
| namespace WebCore { |
| |
| DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSFontFace); |
| |
| template<typename T> void iterateClients(HashSet<CSSFontFace::Client*>& clients, T callback) |
| { |
| Vector<Ref<CSSFontFace::Client>> clientsCopy; |
| clientsCopy.reserveInitialCapacity(clients.size()); |
| for (auto* client : clients) |
| clientsCopy.uncheckedAppend(*client); |
| |
| for (auto& client : clientsCopy) |
| callback(client); |
| } |
| |
| void CSSFontFace::appendSources(CSSFontFace& fontFace, CSSValueList& srcList, ScriptExecutionContext* context, bool isInitiatingElementInUserAgentShadowTree) |
| { |
| for (auto& src : srcList) { |
| // An item in the list either specifies a string (local font name) or a URL (remote font to download). |
| CSSFontFaceSrcValue& item = downcast<CSSFontFaceSrcValue>(src.get()); |
| std::unique_ptr<CSSFontFaceSource> source; |
| SVGFontFaceElement* fontFaceElement = nullptr; |
| bool foundSVGFont = false; |
| |
| foundSVGFont = item.isSVGFontFaceSrc() || item.svgFontFaceElement(); |
| fontFaceElement = item.svgFontFaceElement(); |
| if (!item.isLocal()) { |
| const auto* settings = context ? &context->settingsValues() : nullptr; |
| bool allowDownloading = foundSVGFont || (settings && settings->downloadableBinaryFontsEnabled); |
| if (allowDownloading && item.isSupportedFormat()) { |
| if (auto fontRequest = item.fontLoadRequest(context, foundSVGFont, isInitiatingElementInUserAgentShadowTree)) |
| source = makeUnique<CSSFontFaceSource>(fontFace, item.resource(), *context->cssFontSelector(), makeUniqueRefFromNonNullUniquePtr(WTFMove(fontRequest))); |
| } |
| } else |
| source = (fontFaceElement ? makeUnique<CSSFontFaceSource>(fontFace, item.resource(), *fontFaceElement) |
| : makeUnique<CSSFontFaceSource>(fontFace, item.resource())); |
| |
| if (source) |
| fontFace.adoptSource(WTFMove(source)); |
| } |
| fontFace.sourcesPopulated(); |
| } |
| |
| Ref<CSSFontFace> CSSFontFace::create(CSSFontSelector& fontSelector, StyleRuleFontFace* cssConnection, FontFace* wrapper, bool isLocalFallback) |
| { |
| auto* context = fontSelector.scriptExecutionContext(); |
| const auto* settings = context ? &context->settingsValues() : nullptr; |
| auto result = adoptRef(*new CSSFontFace(settings, cssConnection, wrapper, isLocalFallback)); |
| result->addClient(fontSelector); |
| return result; |
| } |
| |
| CSSFontFace::CSSFontFace(const Settings::Values* settings, StyleRuleFontFace* cssConnection, FontFace* wrapper, bool isLocalFallback) |
| : m_cssConnection(cssConnection) |
| , m_wrapper(wrapper) |
| , m_isLocalFallback(isLocalFallback) |
| , m_mayBePurged(!wrapper) |
| , m_shouldIgnoreFontLoadCompletions(settings && settings->shouldIgnoreFontLoadCompletions) |
| , m_fontLoadTimingOverride(settings ? settings->fontLoadTimingOverride : FontLoadTimingOverride::None) |
| , m_allowUserInstalledFonts(settings && !settings->shouldAllowUserInstalledFonts ? AllowUserInstalledFonts::No : AllowUserInstalledFonts::Yes) |
| , m_timeoutTimer(*this, &CSSFontFace::timeoutFired) |
| { |
| } |
| |
| CSSFontFace::~CSSFontFace() = default; |
| |
| bool CSSFontFace::setFamilies(CSSValue& family) |
| { |
| if (!is<CSSValueList>(family)) |
| return false; |
| |
| CSSValueList& familyList = downcast<CSSValueList>(family); |
| if (!familyList.length()) |
| return false; |
| |
| RefPtr<CSSValueList> oldFamilies = m_families; |
| m_families = &familyList; |
| |
| if (m_cssConnection) |
| m_cssConnection->mutableProperties().setProperty(CSSPropertyFontFamily, &family); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontPropertyChanged(*this, oldFamilies.get()); |
| }); |
| |
| return true; |
| } |
| |
| FontFace* CSSFontFace::existingWrapper() |
| { |
| return m_wrapper.get(); |
| } |
| |
| static FontSelectionRange calculateWeightRange(CSSValue& value) |
| { |
| if (value.isValueList()) { |
| auto& valueList = downcast<CSSValueList>(value); |
| ASSERT(valueList.length() == 2); |
| if (valueList.length() != 2) |
| return { normalWeightValue(), normalWeightValue() }; |
| ASSERT(valueList.item(0)->isPrimitiveValue()); |
| ASSERT(valueList.item(1)->isPrimitiveValue()); |
| auto& value0 = downcast<CSSPrimitiveValue>(*valueList.item(0)); |
| auto& value1 = downcast<CSSPrimitiveValue>(*valueList.item(1)); |
| auto result0 = Style::BuilderConverter::convertFontWeightFromValue(value0); |
| auto result1 = Style::BuilderConverter::convertFontWeightFromValue(value1); |
| return { result0, result1 }; |
| } |
| |
| ASSERT(is<CSSPrimitiveValue>(value)); |
| auto& primitiveValue = downcast<CSSPrimitiveValue>(value); |
| FontSelectionValue result = Style::BuilderConverter::convertFontWeightFromValue(primitiveValue); |
| return { result, result }; |
| } |
| |
| void CSSFontFace::setWeight(CSSValue& weight) |
| { |
| auto range = calculateWeightRange(weight); |
| if (m_fontSelectionCapabilities.weight == range) |
| return; |
| |
| setWeight(range); |
| |
| if (m_cssConnection) |
| m_cssConnection->mutableProperties().setProperty(CSSPropertyFontWeight, &weight); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontPropertyChanged(*this); |
| }); |
| } |
| |
| static FontSelectionRange calculateStretchRange(CSSValue& value) |
| { |
| if (value.isValueList()) { |
| auto& valueList = downcast<CSSValueList>(value); |
| ASSERT(valueList.length() == 2); |
| if (valueList.length() != 2) |
| return { normalStretchValue(), normalStretchValue() }; |
| ASSERT(valueList.item(0)->isPrimitiveValue()); |
| ASSERT(valueList.item(1)->isPrimitiveValue()); |
| auto& value0 = downcast<CSSPrimitiveValue>(*valueList.item(0)); |
| auto& value1 = downcast<CSSPrimitiveValue>(*valueList.item(1)); |
| auto result0 = Style::BuilderConverter::convertFontStretchFromValue(value0); |
| auto result1 = Style::BuilderConverter::convertFontStretchFromValue(value1); |
| return { result0, result1 }; |
| } |
| |
| ASSERT(is<CSSPrimitiveValue>(value)); |
| const auto& primitiveValue = downcast<CSSPrimitiveValue>(value); |
| FontSelectionValue result = Style::BuilderConverter::convertFontStretchFromValue(primitiveValue); |
| return { result, result }; |
| } |
| |
| void CSSFontFace::setStretch(CSSValue& style) |
| { |
| auto range = calculateStretchRange(style); |
| if (m_fontSelectionCapabilities.width == range) |
| return; |
| |
| setStretch(range); |
| |
| if (m_cssConnection) |
| m_cssConnection->mutableProperties().setProperty(CSSPropertyFontStretch, &style); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontPropertyChanged(*this); |
| }); |
| } |
| |
| static FontSelectionRange calculateItalicRange(CSSValue& value) |
| { |
| if (value.isFontStyleValue()) { |
| auto result = Style::BuilderConverter::convertFontStyleFromValue(value); |
| return { result.value_or(normalItalicValue()), result.value_or(normalItalicValue()) }; |
| } |
| |
| ASSERT(value.isFontStyleRangeValue()); |
| auto& rangeValue = downcast<CSSFontStyleRangeValue>(value); |
| ASSERT(rangeValue.fontStyleValue->isValueID()); |
| auto valueID = rangeValue.fontStyleValue->valueID(); |
| if (!rangeValue.obliqueValues) { |
| if (valueID == CSSValueNormal) |
| return { normalItalicValue(), normalItalicValue() }; |
| ASSERT(valueID == CSSValueItalic || valueID == CSSValueOblique); |
| return { italicValue(), italicValue() }; |
| } |
| ASSERT(valueID == CSSValueOblique); |
| auto length = rangeValue.obliqueValues->length(); |
| if (length == 1) { |
| auto& primitiveValue = downcast<CSSPrimitiveValue>(*rangeValue.obliqueValues->item(0)); |
| FontSelectionValue result(primitiveValue.value<float>(CSSUnitType::CSS_DEG)); |
| return { result, result }; |
| } |
| ASSERT(length == 2); |
| auto& primitiveValue1 = downcast<CSSPrimitiveValue>(*rangeValue.obliqueValues->item(0)); |
| auto& primitiveValue2 = downcast<CSSPrimitiveValue>(*rangeValue.obliqueValues->item(1)); |
| FontSelectionValue result1(primitiveValue1.value<float>(CSSUnitType::CSS_DEG)); |
| FontSelectionValue result2(primitiveValue2.value<float>(CSSUnitType::CSS_DEG)); |
| return { result1, result2 }; |
| } |
| |
| void CSSFontFace::setStyle(CSSValue& style) |
| { |
| auto range = calculateItalicRange(style); |
| if (m_fontSelectionCapabilities.slope == range) |
| return; |
| |
| setStyle(range); |
| |
| if (m_cssConnection) |
| m_cssConnection->mutableProperties().setProperty(CSSPropertyFontStyle, &style); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontPropertyChanged(*this); |
| }); |
| } |
| |
| bool CSSFontFace::setUnicodeRange(CSSValue& unicodeRange) |
| { |
| if (!is<CSSValueList>(unicodeRange)) |
| return false; |
| |
| auto& list = downcast<CSSValueList>(unicodeRange); |
| |
| Vector<UnicodeRange> ranges; |
| ranges.reserveInitialCapacity(list.length()); |
| |
| for (auto& rangeValue : list) { |
| auto& range = downcast<CSSUnicodeRangeValue>(rangeValue.get()); |
| ranges.uncheckedAppend({ range.from(), range.to() }); |
| } |
| |
| if (ranges == m_ranges) |
| return true; |
| |
| m_ranges = WTFMove(ranges); |
| |
| if (m_cssConnection) |
| m_cssConnection->mutableProperties().setProperty(CSSPropertyUnicodeRange, &unicodeRange); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontPropertyChanged(*this); |
| }); |
| |
| return true; |
| } |
| |
| void CSSFontFace::setFeatureSettings(CSSValue& featureSettings) |
| { |
| // Can only call this with a primitive value of normal, or a value list containing font feature values. |
| ASSERT(is<CSSPrimitiveValue>(featureSettings) || is<CSSValueList>(featureSettings)); |
| |
| FontFeatureSettings settings; |
| |
| if (is<CSSValueList>(featureSettings)) { |
| auto& list = downcast<CSSValueList>(featureSettings); |
| for (auto& rangeValue : list) { |
| auto& feature = downcast<CSSFontFeatureValue>(rangeValue.get()); |
| settings.insert({ feature.tag(), feature.value() }); |
| } |
| } |
| |
| if (m_featureSettings == settings) |
| return; |
| |
| m_featureSettings = WTFMove(settings); |
| |
| if (m_cssConnection) |
| m_cssConnection->mutableProperties().setProperty(CSSPropertyFontFeatureSettings, &featureSettings); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontPropertyChanged(*this); |
| }); |
| } |
| |
| void CSSFontFace::setLoadingBehavior(CSSValue& loadingBehaviorValue) |
| { |
| auto loadingBehavior = static_cast<FontLoadingBehavior>(downcast<CSSPrimitiveValue>(loadingBehaviorValue)); |
| |
| if (m_loadingBehavior == loadingBehavior) |
| return; |
| |
| m_loadingBehavior = loadingBehavior; |
| |
| if (m_cssConnection) |
| m_cssConnection->mutableProperties().setProperty(CSSPropertyFontDisplay, &loadingBehaviorValue); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontPropertyChanged(*this); |
| }); |
| } |
| |
| bool CSSFontFace::rangesMatchCodePoint(UChar32 character) const |
| { |
| if (m_ranges.isEmpty()) |
| return true; |
| |
| for (auto& range : m_ranges) { |
| if (range.from <= character && character <= range.to) |
| return true; |
| } |
| return false; |
| } |
| |
| void CSSFontFace::fontLoadEventOccurred() |
| { |
| // If the font is already in the cache, CSSFontFaceSource may report it's loaded before it is added here as a source. |
| // Let's not pump the state machine until we've got all our sources. font() and load() are smart enough to act correctly |
| // when a source is failed or succeeded before we have asked it to load. |
| if (m_sourcesPopulated) |
| pump(ExternalResourceDownloadPolicy::Forbid); |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontLoaded(*this); |
| }); |
| } |
| |
| void CSSFontFace::timeoutFired() |
| { |
| Ref<CSSFontFace> protectedThis(*this); |
| |
| switch (status()) { |
| case Status::Loading: |
| setStatus(Status::TimedOut); |
| break; |
| case Status::TimedOut: |
| // Cancelling the network request here could lead to a situation where a site's font never gets |
| // shown as the user navigates around to different pages on the site. This would occur if the |
| // download always takes longer than the timeout (even though the user may spend substantial time |
| // on each page). Therefore, we shouldn't cancel the network request here, but should use the |
| // loading infrastructure's timeout policies instead. |
| setStatus(Status::Failure); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| |
| fontLoadEventOccurred(); |
| } |
| |
| Document* CSSFontFace::document() |
| { |
| if (m_wrapper && is<Document>(m_wrapper->scriptExecutionContext())) |
| return &downcast<Document>(*m_wrapper->scriptExecutionContext()); |
| return nullptr; |
| } |
| |
| FontCache& CSSFontFace::fontCacheFallingBackToSingleton() |
| { |
| if (m_wrapper && m_wrapper->scriptExecutionContext()) |
| return m_wrapper->scriptExecutionContext()->fontCache(); |
| return FontCache::singleton(); |
| } |
| |
| bool CSSFontFace::computeFailureState() const |
| { |
| if (status() == Status::Failure) |
| return true; |
| for (auto& source : m_sources) { |
| if (source->status() != CSSFontFaceSource::Status::Failure) |
| return false; |
| } |
| return true; |
| } |
| |
| void CSSFontFace::addClient(Client& client) |
| { |
| m_clients.add(&client); |
| } |
| |
| void CSSFontFace::removeClient(Client& client) |
| { |
| ASSERT(m_clients.contains(&client)); |
| m_clients.remove(&client); |
| } |
| |
| void CSSFontFace::initializeWrapper() |
| { |
| switch (m_status) { |
| case Status::Pending: |
| break; |
| case Status::Loading: |
| m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading); |
| break; |
| case Status::TimedOut: |
| m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading); |
| m_wrapper->fontStateChanged(*this, Status::Loading, Status::TimedOut); |
| break; |
| case Status::Success: |
| m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading); |
| m_wrapper->fontStateChanged(*this, Status::Pending, Status::Success); |
| break; |
| case Status::Failure: |
| m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading); |
| m_wrapper->fontStateChanged(*this, Status::Pending, Status::Failure); |
| break; |
| } |
| m_mayBePurged = false; |
| } |
| |
| Ref<FontFace> CSSFontFace::wrapper(ScriptExecutionContext* context) |
| { |
| if (m_wrapper) { |
| ASSERT(m_wrapper->scriptExecutionContext() == context); |
| return *m_wrapper.get(); |
| } |
| |
| auto wrapper = FontFace::create(context, *this); |
| m_wrapper = wrapper; |
| initializeWrapper(); |
| return wrapper; |
| } |
| |
| void CSSFontFace::setWrapper(FontFace& newWrapper) |
| { |
| m_wrapper = newWrapper; |
| initializeWrapper(); |
| } |
| |
| void CSSFontFace::adoptSource(std::unique_ptr<CSSFontFaceSource>&& source) |
| { |
| m_sources.append(WTFMove(source)); |
| |
| // We should never add sources in the middle of loading. |
| ASSERT(!m_sourcesPopulated); |
| } |
| |
| auto CSSFontFace::fontLoadTiming() const -> FontLoadTiming |
| { |
| switch (m_fontLoadTimingOverride) { |
| case FontLoadTimingOverride::None: |
| switch (m_loadingBehavior) { |
| case FontLoadingBehavior::Auto: |
| case FontLoadingBehavior::Block: |
| return { 3_s, Seconds::infinity() }; |
| case FontLoadingBehavior::Swap: |
| return { 0_s, Seconds::infinity() }; |
| case FontLoadingBehavior::Fallback: |
| return { 0.1_s, 3_s }; |
| case FontLoadingBehavior::Optional: |
| return { 0.1_s, 0_s }; |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| case FontLoadTimingOverride::Block: |
| return { Seconds::infinity(), 0_s }; |
| case FontLoadTimingOverride::Swap: |
| return { 0_s, Seconds::infinity() }; |
| case FontLoadTimingOverride::Failure: |
| return { 0_s, 0_s }; |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| } |
| |
| void CSSFontFace::setStatus(Status newStatus) |
| { |
| switch (newStatus) { |
| case Status::Pending: |
| ASSERT_NOT_REACHED(); |
| break; |
| case Status::Loading: |
| ASSERT(m_status == Status::Pending); |
| break; |
| case Status::TimedOut: |
| ASSERT(m_status == Status::Loading); |
| break; |
| case Status::Success: |
| ASSERT(m_status == Status::Loading || m_status == Status::TimedOut); |
| break; |
| case Status::Failure: |
| ASSERT(m_status == Status::Loading || m_status == Status::TimedOut); |
| break; |
| } |
| |
| iterateClients(m_clients, [&](Client& client) { |
| client.fontStateChanged(*this, m_status, newStatus); |
| }); |
| |
| m_status = newStatus; |
| |
| Seconds blockPeriodTimeout; |
| Seconds swapPeriodTimeout; |
| auto timeouts = fontLoadTiming(); |
| blockPeriodTimeout = timeouts.blockPeriod; |
| swapPeriodTimeout = timeouts.swapPeriod; |
| |
| // Transfer across 0-delay timers synchronously. Layouts/script may |
| // take arbitrarily long time, and we shouldn't be in a 0-duration |
| // state for an arbitrarily long time. Also it's necessary for |
| // testing so we don't have a race with the font load. |
| switch (newStatus) { |
| case Status::Pending: |
| ASSERT_NOT_REACHED(); |
| break; |
| case Status::Loading: |
| if (blockPeriodTimeout == 0_s) |
| setStatus(Status::TimedOut); |
| else if (std::isfinite(blockPeriodTimeout.value())) |
| m_timeoutTimer.startOneShot(blockPeriodTimeout); |
| break; |
| case Status::TimedOut: |
| if (swapPeriodTimeout == 0_s) |
| setStatus(Status::Failure); |
| else if (std::isfinite(swapPeriodTimeout.value())) |
| m_timeoutTimer.startOneShot(swapPeriodTimeout); |
| break; |
| case Status::Success: |
| case Status::Failure: |
| m_timeoutTimer.stop(); |
| break; |
| } |
| } |
| |
| void CSSFontFace::fontLoaded(CSSFontFaceSource&) |
| { |
| Ref<CSSFontFace> protectedThis(*this); |
| |
| fontLoadEventOccurred(); |
| } |
| |
| void CSSFontFace::opportunisticallyStartFontDataURLLoading() |
| { |
| // We don't want to go crazy here and blow the cache. Usually these data URLs are the first item in the src: list, so let's just check that one. |
| if (!m_sources.isEmpty()) |
| m_sources[0]->opportunisticallyStartFontDataURLLoading(); |
| } |
| |
| size_t CSSFontFace::pump(ExternalResourceDownloadPolicy policy) |
| { |
| if (status() == Status::Failure) |
| return 0; |
| |
| size_t i; |
| for (i = 0; i < m_sources.size(); ++i) { |
| auto& source = m_sources[i]; |
| |
| if (source->status() == CSSFontFaceSource::Status::Pending) { |
| ASSERT(m_status == Status::Pending || m_status == Status::Loading || m_status == Status::TimedOut); |
| // This is a little tricky. After calling CSSFontFace::font(Forbid), a font must never fail later in |
| // this turn of the runloop because the return value of CSSFontFace::font() shouldn't get nulled out |
| // from under an existing FontRanges object. Remote fonts are all downloaded asynchronously, so this |
| // isn't a problem for them because CSSFontFace::font() will always return the interstitial font. |
| // However, local fonts may synchronously fail when you call load() on them. Therefore, we have to call |
| // load() here in order to guarantee that, if the font synchronously fails, it happens now during the |
| // first call to CSSFontFace::font() and the FontRanges object sees a consistent view of the |
| // CSSFontFace. This means we eagerly create some internal font objects when they may not be needed, |
| // but it seems that this behavior is a requirement of the design of FontRanges. FIXME: Perhaps rethink |
| // this design. |
| if (policy == ExternalResourceDownloadPolicy::Allow || !source->requiresExternalResource()) { |
| if (policy == ExternalResourceDownloadPolicy::Allow && m_status == Status::Pending) |
| setStatus(Status::Loading); |
| source->load(document()); |
| } |
| } |
| |
| switch (source->status()) { |
| case CSSFontFaceSource::Status::Pending: |
| ASSERT(policy == ExternalResourceDownloadPolicy::Forbid); |
| return i; |
| case CSSFontFaceSource::Status::Loading: |
| ASSERT(m_status == Status::Pending || m_status == Status::Loading || m_status == Status::TimedOut || m_status == Status::Failure); |
| if (policy == ExternalResourceDownloadPolicy::Allow && m_status == Status::Pending) |
| setStatus(Status::Loading); |
| return i; |
| case CSSFontFaceSource::Status::Success: |
| ASSERT(m_status == Status::Pending || m_status == Status::Loading || m_status == Status::TimedOut || m_status == Status::Success || m_status == Status::Failure); |
| if (m_status == Status::Pending) |
| setStatus(Status::Loading); |
| if (m_status == Status::Loading || m_status == Status::TimedOut) |
| setStatus(Status::Success); |
| return i; |
| case CSSFontFaceSource::Status::Failure: |
| if (policy == ExternalResourceDownloadPolicy::Allow && m_status == Status::Pending) |
| setStatus(Status::Loading); |
| break; |
| } |
| } |
| if (m_sources.isEmpty() && m_status == Status::Pending) |
| setStatus(Status::Loading); |
| if (m_status == Status::Loading || m_status == Status::TimedOut) |
| setStatus(Status::Failure); |
| return m_sources.size(); |
| } |
| |
| void CSSFontFace::load() |
| { |
| pump(ExternalResourceDownloadPolicy::Allow); |
| } |
| |
| static Font::Visibility visibility(CSSFontFace::Status status, CSSFontFace::FontLoadTiming timing) |
| { |
| switch (status) { |
| case CSSFontFace::Status::Pending: |
| return timing.blockPeriod == 0_s ? Font::Visibility::Visible : Font::Visibility::Invisible; |
| case CSSFontFace::Status::Loading: |
| return Font::Visibility::Invisible; |
| case CSSFontFace::Status::TimedOut: |
| case CSSFontFace::Status::Failure: |
| case CSSFontFace::Status::Success: |
| default: |
| return Font::Visibility::Visible; |
| } |
| } |
| |
| RefPtr<Font> CSSFontFace::font(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic, ExternalResourceDownloadPolicy policy, const FontPaletteValues& fontPaletteValues) |
| { |
| if (computeFailureState()) |
| return nullptr; |
| |
| Ref<CSSFontFace> protectedThis(*this); |
| |
| // Our status is derived from the first non-failed source. However, this source may |
| // return null from font(), which means we need to continue looping through the remainder |
| // of the sources to try to find a font to use. These subsequent tries should not affect |
| // our own state, though. |
| size_t startIndex = pump(policy); |
| |
| if (computeFailureState()) |
| return nullptr; |
| |
| for (size_t i = startIndex; i < m_sources.size(); ++i) { |
| auto& source = m_sources[i]; |
| if (source->status() == CSSFontFaceSource::Status::Pending && (policy == ExternalResourceDownloadPolicy::Allow || !source->requiresExternalResource())) |
| source->load(document()); |
| |
| switch (source->status()) { |
| case CSSFontFaceSource::Status::Pending: |
| case CSSFontFaceSource::Status::Loading: { |
| auto& fontCache = fontCacheFallingBackToSingleton(); |
| Font::Visibility visibility = WebCore::visibility(status(), fontLoadTiming()); |
| return Font::create(fontCache.lastResortFallbackFont(fontDescription)->platformData(), Font::Origin::Local, &fontCache, Font::Interstitial::Yes, visibility); |
| } |
| case CSSFontFaceSource::Status::Success: { |
| FontCreationContext fontCreationContext { m_featureSettings, m_fontSelectionCapabilities, fontPaletteValues }; |
| if (auto result = source->font(fontDescription, syntheticBold, syntheticItalic, fontCreationContext)) |
| return result; |
| break; |
| } |
| case CSSFontFaceSource::Status::Failure: |
| break; |
| } |
| } |
| |
| return nullptr; |
| } |
| |
| bool CSSFontFace::purgeable() const |
| { |
| return cssConnection() && m_mayBePurged; |
| } |
| |
| void CSSFontFace::updateStyleIfNeeded() |
| { |
| iterateClients(m_clients, [&](Client& client) { |
| client.updateStyleIfNeeded(*this); |
| }); |
| } |
| |
| bool CSSFontFace::hasSVGFontFaceSource() const |
| { |
| size_t size = m_sources.size(); |
| for (size_t i = 0; i < size; i++) { |
| if (m_sources[i]->isSVGFontFaceSource()) |
| return true; |
| } |
| return false; |
| } |
| |
| void CSSFontFace::setErrorState() |
| { |
| switch (m_status) { |
| case Status::Pending: |
| setStatus(Status::Loading); |
| break; |
| case Status::Success: |
| ASSERT_NOT_REACHED(); |
| break; |
| case Status::Failure: |
| return; |
| default: |
| break; |
| } |
| |
| setStatus(Status::Failure); |
| } |
| |
| } |
