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/*
* This file is part of the internal font implementation.
*
* Copyright (C) 2006-2021 Apple Inc. All rights reserved.
* Copyright (C) 2007-2008 Torch Mobile, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "FloatRect.h"
#include "FontMetrics.h"
#include "FontPlatformData.h"
#include "GlyphBuffer.h"
#include "GlyphMetricsMap.h"
#include "GlyphPage.h"
#include "OpenTypeMathData.h"
#include "RenderingResourceIdentifier.h"
#include <wtf/BitVector.h>
#include <wtf/Hasher.h>
#include <wtf/text/StringHash.h>
#if PLATFORM(COCOA)
#include <CoreFoundation/CoreFoundation.h>
#include <pal/cf/OTSVGTable.h>
#include <wtf/RetainPtr.h>
#endif
#if ENABLE(OPENTYPE_VERTICAL)
#include "OpenTypeVerticalData.h"
#endif
#if PLATFORM(WIN)
#include <usp10.h>
#endif
namespace WebCore {
class FontCache;
class FontDescription;
class GlyphPage;
class FragmentedSharedBuffer;
struct GlyphData;
enum FontVariant { AutoVariant, NormalVariant, SmallCapsVariant, EmphasisMarkVariant, BrokenIdeographVariant };
enum Pitch { UnknownPitch, FixedPitch, VariablePitch };
enum class IsForPlatformFont : bool { No, Yes };
#if USE(CORE_TEXT)
bool fontHasTable(CTFontRef, unsigned tableTag);
bool fontHasEitherTable(CTFontRef, unsigned tableTag1, unsigned tableTag2);
#endif
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(Font);
class Font : public RefCounted<Font> {
WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(Font);
public:
// Used to create platform fonts.
enum class Origin : bool { Remote, Local };
enum class Interstitial : bool { No, Yes };
enum class Visibility : bool { Visible, Invisible };
enum class OrientationFallback : bool { No, Yes };
WEBCORE_EXPORT static Ref<Font> create(const FontPlatformData&, Origin = Origin::Local, Interstitial = Interstitial::No, Visibility = Visibility::Visible, OrientationFallback = OrientationFallback::No, std::optional<RenderingResourceIdentifier> = std::nullopt);
WEBCORE_EXPORT static Ref<Font> create(Ref<SharedBuffer>&& fontFaceData, Font::Origin, float fontSize, bool syntheticBold, bool syntheticItalic);
WEBCORE_EXPORT ~Font();
static const Font* systemFallback() { return reinterpret_cast<const Font*>(-1); }
const FontPlatformData& platformData() const { return m_platformData; }
const OpenTypeMathData* mathData() const;
#if ENABLE(OPENTYPE_VERTICAL)
const OpenTypeVerticalData* verticalData() const { return m_verticalData.get(); }
#endif
WEBCORE_EXPORT RenderingResourceIdentifier renderingResourceIdentifier() const;
const Font* smallCapsFont(const FontDescription&) const;
const Font& noSynthesizableFeaturesFont() const;
const Font* emphasisMarkFont(const FontDescription&) const;
const Font& brokenIdeographFont() const;
bool isProbablyOnlyUsedToRenderIcons() const;
const Font* variantFont(const FontDescription& description, FontVariant variant) const
{
#if PLATFORM(COCOA)
ASSERT(variant != SmallCapsVariant);
#endif
switch (variant) {
case SmallCapsVariant:
return smallCapsFont(description);
case EmphasisMarkVariant:
return emphasisMarkFont(description);
case BrokenIdeographVariant:
return &brokenIdeographFont();
case AutoVariant:
case NormalVariant:
break;
}
ASSERT_NOT_REACHED();
return const_cast<Font*>(this);
}
bool variantCapsSupportsCharacterForSynthesis(FontVariantCaps, UChar32) const;
const Font& verticalRightOrientationFont() const;
const Font& uprightOrientationFont() const;
const Font& invisibleFont() const;
bool hasVerticalGlyphs() const { return m_hasVerticalGlyphs; }
bool isTextOrientationFallback() const { return m_isTextOrientationFallback; }
const FontMetrics& fontMetrics() const { return m_fontMetrics; }
float sizePerUnit() const { return platformData().size() / (fontMetrics().unitsPerEm() ? fontMetrics().unitsPerEm() : 1); }
float maxCharWidth() const { return m_maxCharWidth; }
void setMaxCharWidth(float maxCharWidth) { m_maxCharWidth = maxCharWidth; }
float avgCharWidth() const { return m_avgCharWidth; }
void setAvgCharWidth(float avgCharWidth) { m_avgCharWidth = avgCharWidth; }
FloatRect boundsForGlyph(Glyph) const;
float widthForGlyph(Glyph) const;
const Path& pathForGlyph(Glyph) const; // Don't store the result of this! The hash map is free to rehash at any point, leaving this reference dangling.
FloatRect platformBoundsForGlyph(Glyph) const;
float platformWidthForGlyph(Glyph) const;
Path platformPathForGlyph(Glyph) const;
float spaceWidth() const { return m_spaceWidth; }
float syntheticBoldOffset() const { return m_syntheticBoldOffset; }
Glyph spaceGlyph() const { return m_spaceGlyph; }
Glyph zeroWidthSpaceGlyph() const { return m_zeroWidthSpaceGlyph; }
bool isZeroWidthSpaceGlyph(Glyph glyph) const { return glyph == m_zeroWidthSpaceGlyph && glyph; }
GlyphData glyphDataForCharacter(UChar32) const;
Glyph glyphForCharacter(UChar32) const;
bool supportsCodePoint(UChar32) const;
bool platformSupportsCodePoint(UChar32, std::optional<UChar32> variation = std::nullopt) const;
RefPtr<Font> systemFallbackFontForCharacter(UChar32, const FontDescription&, IsForPlatformFont) const;
const GlyphPage* glyphPage(unsigned pageNumber) const;
void determinePitch();
Pitch pitch() const { return m_treatAsFixedPitch ? FixedPitch : VariablePitch; }
Origin origin() const { return m_origin; }
bool isInterstitial() const { return m_isInterstitial; }
Visibility visibility() const { return m_visibility; }
bool allowsAntialiasing() const { return m_allowsAntialiasing; }
#if !LOG_DISABLED
String description() const;
#endif
#if PLATFORM(IOS_FAMILY)
bool shouldNotBeUsedForArabic() const { return m_shouldNotBeUsedForArabic; };
#endif
#if PLATFORM(COCOA)
CTFontRef getCTFont() const { return m_platformData.font(); }
RetainPtr<CFDictionaryRef> getCFStringAttributes(bool enableKerning, FontOrientation, const AtomString& locale) const;
const BitVector& glyphsSupportedBySmallCaps() const;
const BitVector& glyphsSupportedByAllSmallCaps() const;
const BitVector& glyphsSupportedByPetiteCaps() const;
const BitVector& glyphsSupportedByAllPetiteCaps() const;
#endif
bool canRenderCombiningCharacterSequence(const UChar*, size_t) const;
GlyphBufferAdvance applyTransforms(GlyphBuffer&, unsigned beginningGlyphIndex, unsigned beginningStringIndex, bool enableKerning, bool requiresShaping, const AtomString& locale, StringView text, TextDirection) const;
// Returns nullopt if none of the glyphs are OT-SVG glyphs.
std::optional<BitVector> findOTSVGGlyphs(const GlyphBufferGlyph*, unsigned count) const;
bool hasAnyComplexColorFormatGlyphs(const GlyphBufferGlyph*, unsigned count) const;
#if PLATFORM(WIN)
SCRIPT_FONTPROPERTIES* scriptFontProperties() const;
SCRIPT_CACHE* scriptCache() const { return &m_scriptCache; }
static void setShouldApplyMacAscentHack(bool);
static bool shouldApplyMacAscentHack();
static float ascentConsideringMacAscentHack(const WCHAR*, float ascent, float descent);
#endif
private:
WEBCORE_EXPORT Font(const FontPlatformData&, Origin, Interstitial, Visibility, OrientationFallback, std::optional<RenderingResourceIdentifier>);
void platformInit();
void platformGlyphInit();
void platformCharWidthInit();
void platformDestroy();
void initCharWidths();
RefPtr<Font> createFontWithoutSynthesizableFeatures() const;
RefPtr<Font> createScaledFont(const FontDescription&, float scaleFactor) const;
RefPtr<Font> platformCreateScaledFont(const FontDescription&, float scaleFactor) const;
void removeFromSystemFallbackCache();
struct DerivedFonts;
DerivedFonts& ensureDerivedFontData() const;
#if PLATFORM(WIN)
void initGDIFont();
void platformCommonDestroy();
FloatRect boundsForGDIGlyph(Glyph) const;
float widthForGDIGlyph(Glyph) const;
#endif
#if PLATFORM(COCOA)
class ComplexColorFormatGlyphs {
public:
static ComplexColorFormatGlyphs createWithNoRelevantTables();
static ComplexColorFormatGlyphs createWithRelevantTablesAndGlyphCount(unsigned glyphCount);
bool hasValueFor(Glyph) const;
bool get(Glyph) const;
void set(Glyph, bool value);
bool hasRelevantTables() const { return m_hasRelevantTables; }
private:
static constexpr size_t bitForInitialized(Glyph glyphID) { return static_cast<size_t>(glyphID) * 2; }
static constexpr size_t bitForValue(Glyph glyphID) { return static_cast<size_t>(glyphID) * 2 + 1; }
static constexpr size_t bitsRequiredForGlyphCount(unsigned glyphCount) { return glyphCount * 2; }
ComplexColorFormatGlyphs(bool hasRelevantTables, unsigned glyphCount)
: m_hasRelevantTables(hasRelevantTables)
, m_bits(bitsRequiredForGlyphCount(glyphCount))
{ }
bool m_hasRelevantTables;
BitVector m_bits; // pairs of (initialized, value) bits
};
const PAL::OTSVGTable& otSVGTable() const;
bool glyphHasComplexColorFormat(Glyph) const;
bool hasComplexColorFormatTables() const;
ComplexColorFormatGlyphs& glyphsWithComplexColorFormat() const;
#endif
FontMetrics m_fontMetrics;
float m_maxCharWidth { -1 };
float m_avgCharWidth { -1 };
const FontPlatformData m_platformData;
mutable RefPtr<GlyphPage> m_glyphPageZero;
mutable HashMap<unsigned, RefPtr<GlyphPage>> m_glyphPages;
mutable std::unique_ptr<GlyphMetricsMap<FloatRect>> m_glyphToBoundsMap;
mutable GlyphMetricsMap<float> m_glyphToWidthMap;
mutable GlyphMetricsMap<std::optional<Path>> m_glyphPathMap;
mutable BitVector m_codePointSupport;
mutable RefPtr<OpenTypeMathData> m_mathData;
#if ENABLE(OPENTYPE_VERTICAL)
RefPtr<OpenTypeVerticalData> m_verticalData;
#endif
mutable std::optional<RenderingResourceIdentifier> m_renderingResourceIdentifier;
struct DerivedFonts {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
public:
RefPtr<Font> smallCapsFont;
RefPtr<Font> noSynthesizableFeaturesFont;
RefPtr<Font> emphasisMarkFont;
RefPtr<Font> brokenIdeographFont;
RefPtr<Font> verticalRightOrientationFont;
RefPtr<Font> uprightOrientationFont;
RefPtr<Font> invisibleFont;
};
mutable std::unique_ptr<DerivedFonts> m_derivedFontData;
#if PLATFORM(COCOA)
mutable std::optional<BitVector> m_glyphsSupportedBySmallCaps;
mutable std::optional<BitVector> m_glyphsSupportedByAllSmallCaps;
mutable std::optional<BitVector> m_glyphsSupportedByPetiteCaps;
mutable std::optional<BitVector> m_glyphsSupportedByAllPetiteCaps;
mutable std::optional<PAL::OTSVGTable> m_otSVGTable;
mutable std::optional<ComplexColorFormatGlyphs> m_glyphsWithComplexColorFormat; // SVG and sbix
#endif
#if PLATFORM(WIN)
mutable SCRIPT_CACHE m_scriptCache;
mutable SCRIPT_FONTPROPERTIES* m_scriptFontProperties;
#endif
Glyph m_spaceGlyph { 0 };
Glyph m_zeroWidthSpaceGlyph { 0 };
Origin m_origin; // Whether or not we are custom font loaded via @font-face
Visibility m_visibility; // @font-face's internal timer can cause us to show fonts even when a font is being downloaded.
float m_spaceWidth { 0 };
float m_adjustedSpaceWidth { 0 };
float m_syntheticBoldOffset { 0 };
unsigned m_treatAsFixedPitch : 1;
unsigned m_isInterstitial : 1; // Whether or not this custom font is the last resort placeholder for a loading font
unsigned m_isTextOrientationFallback : 1;
unsigned m_isBrokenIdeographFallback : 1;
unsigned m_hasVerticalGlyphs : 1;
unsigned m_isUsedInSystemFallbackCache : 1;
unsigned m_allowsAntialiasing : 1;
#if PLATFORM(IOS_FAMILY)
unsigned m_shouldNotBeUsedForArabic : 1;
#endif
// Adding any non-derived information to Font needs a parallel change in WebCoreArgumentCoders.cpp.
};
#if PLATFORM(IOS_FAMILY)
bool fontFamilyShouldNotBeUsedForArabic(CFStringRef);
#endif
ALWAYS_INLINE FloatRect Font::boundsForGlyph(Glyph glyph) const
{
if (isZeroWidthSpaceGlyph(glyph))
return FloatRect();
FloatRect bounds;
if (m_glyphToBoundsMap) {
bounds = m_glyphToBoundsMap->metricsForGlyph(glyph);
if (bounds.width() != cGlyphSizeUnknown)
return bounds;
}
bounds = platformBoundsForGlyph(glyph);
if (!m_glyphToBoundsMap)
m_glyphToBoundsMap = makeUnique<GlyphMetricsMap<FloatRect>>();
m_glyphToBoundsMap->setMetricsForGlyph(glyph, bounds);
return bounds;
}
ALWAYS_INLINE float Font::widthForGlyph(Glyph glyph) const
{
// The optimization of returning 0 for the zero-width-space glyph is incorrect for the LastResort font,
// used in place of the actual font when isLoading() is true on both macOS and iOS.
// The zero-width-space glyph in that font does not have a width of zero and, further, that glyph is used
// for many other characters and must not be zero width when used for them.
if (isZeroWidthSpaceGlyph(glyph) && !isInterstitial())
return 0;
float width = m_glyphToWidthMap.metricsForGlyph(glyph);
if (width != cGlyphSizeUnknown)
return width;
#if ENABLE(OPENTYPE_VERTICAL)
if (m_verticalData)
width = m_verticalData->advanceHeight(this, glyph);
else
#endif
width = platformWidthForGlyph(glyph);
m_glyphToWidthMap.setMetricsForGlyph(glyph, width);
return width;
}
} // namespace WebCore
namespace WTF {
template<> struct EnumTraits<WebCore::Font::Origin> {
using values = EnumValues<
WebCore::Font::Origin,
WebCore::Font::Origin::Remote,
WebCore::Font::Origin::Local
>;
};
template<> struct EnumTraits<WebCore::Font::Interstitial> {
using values = EnumValues<
WebCore::Font::Interstitial,
WebCore::Font::Interstitial::Yes,
WebCore::Font::Interstitial::No
>;
};
template<> struct EnumTraits<WebCore::Font::Visibility> {
using values = EnumValues<
WebCore::Font::Visibility,
WebCore::Font::Visibility::Visible,
WebCore::Font::Visibility::Invisible
>;
};
template<> struct EnumTraits<WebCore::Font::OrientationFallback> {
using values = EnumValues<
WebCore::Font::OrientationFallback,
WebCore::Font::OrientationFallback::Yes,
WebCore::Font::OrientationFallback::No
>;
};
}