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/*
* 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.
*/
#pragma once
#include "FontSelectionValueInlines.h"
#include "FontTaggedSettings.h"
#include "Settings.h"
#include "StyleRule.h"
#include "TextFlags.h"
#include <memory>
#include <wtf/Forward.h>
#include <wtf/HashSet.h>
#include <wtf/WeakPtr.h>
namespace JSC {
class CallFrame;
}
namespace WebCore {
class CSSFontFaceSource;
class CSSFontSelector;
class CSSSegmentedFontFace;
class CSSValue;
class CSSValueList;
class Document;
class FontCreationContext;
class FontDescription;
class Font;
class FontFace;
class ScriptExecutionContext;
enum class ExternalResourceDownloadPolicy;
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSFontFace);
class CSSFontFace final : public RefCounted<CSSFontFace> {
WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(CSSFontFace);
public:
static Ref<CSSFontFace> create(CSSFontSelector&, StyleRuleFontFace* cssConnection = nullptr, FontFace* wrapper = nullptr, bool isLocalFallback = false);
virtual ~CSSFontFace();
// FIXME: These functions don't need to have boolean return values.
// Callers only call this with known-valid CSS values.
bool setFamilies(CSSValue&);
void setStyle(CSSValue&);
void setWeight(CSSValue&);
void setStretch(CSSValue&);
bool setUnicodeRange(CSSValue&);
void setFeatureSettings(CSSValue&);
void setLoadingBehavior(CSSValue&);
// Pending => Loading => TimedOut
// || \\ // ||
// || \\ // ||
// || \\// ||
// || // ||
// || //\\ ||
// || // \\ ||
// \/ \/ \/ \/
// Success Failure
enum class Status : uint8_t { Pending, Loading, TimedOut, Success, Failure };
struct UnicodeRange;
// Optional return values to represent default string for members of FontFace.h
const std::optional<CSSValueList*> families() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<CSSValueList*>>(m_families.get()); }
std::optional<FontSelectionRange> weight() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<FontSelectionRange>>(m_fontSelectionCapabilities.computeWeight()); }
std::optional<FontSelectionRange> stretch() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<FontSelectionRange>>(m_fontSelectionCapabilities.computeWidth()); }
std::optional<FontSelectionRange> italic() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<FontSelectionRange>>(m_fontSelectionCapabilities.computeSlope()); }
std::optional<FontSelectionCapabilities> fontSelectionCapabilities() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<FontSelectionCapabilities>>(m_fontSelectionCapabilities.computeFontSelectionCapabilities()); }
const std::optional<Vector<UnicodeRange>> ranges() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<Vector<UnicodeRange>>>(m_ranges); }
const std::optional<FontFeatureSettings> featureSettings() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<FontFeatureSettings>>(m_featureSettings); }
std::optional<FontLoadingBehavior> loadingBehavior() const { return m_status == Status::Failure ? std::nullopt : static_cast<std::optional<FontLoadingBehavior>>(m_loadingBehavior); }
void setWeight(FontSelectionRange weight) { m_fontSelectionCapabilities.weight = weight; }
void setStretch(FontSelectionRange stretch) { m_fontSelectionCapabilities.width = stretch; }
void setStyle(FontSelectionRange italic) { m_fontSelectionCapabilities.slope = italic; }
void setFontSelectionCapabilities(FontSelectionCapabilities capabilities) { m_fontSelectionCapabilities = capabilities; }
bool isLocalFallback() const { return m_isLocalFallback; }
Status status() const { return m_status; }
StyleRuleFontFace* cssConnection() const { return m_cssConnection.get(); }
class Client;
void addClient(Client&);
void removeClient(Client&);
bool computeFailureState() const;
void opportunisticallyStartFontDataURLLoading();
void adoptSource(std::unique_ptr<CSSFontFaceSource>&&);
void sourcesPopulated() { m_sourcesPopulated = true; }
void fontLoaded(CSSFontFaceSource&);
void load();
RefPtr<Font> font(const FontDescription&, bool syntheticBold, bool syntheticItalic, ExternalResourceDownloadPolicy, const FontPaletteValues&);
static void appendSources(CSSFontFace&, CSSValueList&, ScriptExecutionContext*, bool isInitiatingElementInUserAgentShadowTree);
class Client {
public:
virtual ~Client() = default;
virtual void fontLoaded(CSSFontFace&) { }
virtual void fontStateChanged(CSSFontFace&, Status /*oldState*/, Status /*newState*/) { }
virtual void fontPropertyChanged(CSSFontFace&, CSSValueList* /*oldFamilies*/ = nullptr) { }
virtual void updateStyleIfNeeded(CSSFontFace&) { }
virtual void ref() = 0;
virtual void deref() = 0;
};
struct UnicodeRange {
UChar32 from;
UChar32 to;
bool operator==(const UnicodeRange& other) const { return from == other.from && to == other.to; }
bool operator!=(const UnicodeRange& other) const { return !(*this == other); }
};
bool rangesMatchCodePoint(UChar32) const;
// We don't guarantee that the FontFace wrapper will be the same every time you ask for it.
Ref<FontFace> wrapper(ScriptExecutionContext*);
void setWrapper(FontFace&);
FontFace* existingWrapper();
struct FontLoadTiming {
Seconds blockPeriod;
Seconds swapPeriod;
};
FontLoadTiming fontLoadTiming() const;
bool shouldIgnoreFontLoadCompletions() const { return m_shouldIgnoreFontLoadCompletions; }
bool purgeable() const;
AllowUserInstalledFonts allowUserInstalledFonts() const { return m_allowUserInstalledFonts; }
void updateStyleIfNeeded();
bool hasSVGFontFaceSource() const;
void setErrorState();
private:
CSSFontFace(const Settings::Values*, StyleRuleFontFace*, FontFace*, bool isLocalFallback);
size_t pump(ExternalResourceDownloadPolicy);
void setStatus(Status);
void notifyClientsOfFontPropertyChange();
void initializeWrapper();
void fontLoadEventOccurred();
void timeoutFired();
Document* document();
RefPtr<CSSValueList> m_families;
Vector<UnicodeRange> m_ranges;
FontFeatureSettings m_featureSettings;
FontLoadingBehavior m_loadingBehavior { FontLoadingBehavior::Auto };
Vector<std::unique_ptr<CSSFontFaceSource>, 0, CrashOnOverflow, 0> m_sources;
RefPtr<StyleRuleFontFace> m_cssConnection;
HashSet<Client*> m_clients;
WeakPtr<FontFace> m_wrapper;
FontSelectionSpecifiedCapabilities m_fontSelectionCapabilities;
Status m_status { Status::Pending };
bool m_isLocalFallback { false };
bool m_sourcesPopulated { false };
bool m_mayBePurged { true };
bool m_shouldIgnoreFontLoadCompletions { false };
FontLoadTimingOverride m_fontLoadTimingOverride { FontLoadTimingOverride::None };
AllowUserInstalledFonts m_allowUserInstalledFonts { AllowUserInstalledFonts::Yes };
Timer m_timeoutTimer;
};
}
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