FontPlatformDataCocoa.mm [plain text]
/*
* This file is part of the internal font implementation.
*
* Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
* Copyright (c) 2010 Google Inc. All rights reserved.
*
* 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.
*
*/
#import "config.h"
#import "FontPlatformData.h"
#import "SharedBuffer.h"
#import <pal/spi/cocoa/CoreTextSPI.h>
#import <wtf/text/StringConcatenateNumbers.h>
#if PLATFORM(IOS_FAMILY)
#import <CoreText/CoreText.h>
#import <pal/spi/cg/CoreGraphicsSPI.h>
#endif
namespace WebCore {
// These CoreText Text Spacing feature selectors are not defined in CoreText.
enum TextSpacingCTFeatureSelector { TextSpacingProportional, TextSpacingFullWidth, TextSpacingHalfWidth, TextSpacingThirdWidth, TextSpacingQuarterWidth };
FontPlatformData::FontPlatformData(CTFontRef font, float size, bool syntheticBold, bool syntheticOblique, FontOrientation orientation, FontWidthVariant widthVariant, TextRenderingMode textRenderingMode)
: FontPlatformData(size, syntheticBold, syntheticOblique, orientation, widthVariant, textRenderingMode)
{
ASSERT_ARG(font, font);
m_font = font;
m_isColorBitmapFont = CTFontGetSymbolicTraits(font) & kCTFontTraitColorGlyphs;
m_isSystemFont = CTFontDescriptorIsSystemUIFont(adoptCF(CTFontCopyFontDescriptor(m_font.get())).get());
auto variations = adoptCF(static_cast<CFDictionaryRef>(CTFontCopyAttribute(font, kCTFontVariationAttribute)));
m_hasVariations = variations && CFDictionaryGetCount(variations.get());
#if PLATFORM(IOS_FAMILY)
m_isEmoji = CTFontIsAppleColorEmoji(m_font.get());
#endif
}
unsigned FontPlatformData::hash() const
{
uintptr_t flags = static_cast<uintptr_t>(static_cast<unsigned>(m_widthVariant) << 6
| m_isHashTableDeletedValue << 5
| static_cast<unsigned>(m_textRenderingMode) << 3
| static_cast<unsigned>(m_orientation) << 2
| m_syntheticBold << 1
| m_syntheticOblique);
uintptr_t fontHash = reinterpret_cast<uintptr_t>(CFHash(m_font.get()));
uintptr_t hashCodes[] = { fontHash, flags };
return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
}
bool FontPlatformData::platformIsEqual(const FontPlatformData& other) const
{
if (!m_font || !other.m_font)
return m_font == other.m_font;
return CFEqual(m_font.get(), other.m_font.get());
}
CTFontRef FontPlatformData::registeredFont() const
{
CTFontRef platformFont = font();
ASSERT(platformFont);
if (platformFont && adoptCF(CTFontCopyAttribute(platformFont, kCTFontURLAttribute)))
return platformFont;
return nullptr;
}
inline int mapFontWidthVariantToCTFeatureSelector(FontWidthVariant variant)
{
switch(variant) {
case FontWidthVariant::RegularWidth:
return TextSpacingProportional;
case FontWidthVariant::HalfWidth:
return TextSpacingHalfWidth;
case FontWidthVariant::ThirdWidth:
return TextSpacingThirdWidth;
case FontWidthVariant::QuarterWidth:
return TextSpacingQuarterWidth;
}
ASSERT_NOT_REACHED();
return TextSpacingProportional;
}
static CFDictionaryRef cascadeToLastResortAttributesDictionary()
{
static CFDictionaryRef attributes = nullptr;
if (attributes)
return attributes;
RetainPtr<CTFontDescriptorRef> lastResort = adoptCF(CTFontDescriptorCreateWithNameAndSize(CFSTR("LastResort"), 0));
CFTypeRef descriptors[] = { lastResort.get() };
RetainPtr<CFArrayRef> array = adoptCF(CFArrayCreate(kCFAllocatorDefault, descriptors, WTF_ARRAY_LENGTH(descriptors), &kCFTypeArrayCallBacks));
CFTypeRef keys[] = { kCTFontCascadeListAttribute };
CFTypeRef values[] = { array.get() };
attributes = CFDictionaryCreate(kCFAllocatorDefault, keys, values, WTF_ARRAY_LENGTH(keys), &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
return attributes;
}
static RetainPtr<CTFontDescriptorRef> cascadeToLastResortAndVariationsFontDescriptor(CTFontRef originalFont)
{
// FIXME: Remove this when <rdar://problem/28449441> is fixed. NOTE: That radar was fixed 11/16/16, so this can be removed. TBD.
#define WORKAROUND_CORETEXT_VARIATIONS_WITH_FALLBACK_LIST_BUG (ENABLE(VARIATION_FONTS) && (PLATFORM(IOS_FAMILY) && __IPHONE_OS_VERSION_MIN_REQUIRED < 110000))
CFDictionaryRef attributes = cascadeToLastResortAttributesDictionary();
#if WORKAROUND_CORETEXT_VARIATIONS_WITH_FALLBACK_LIST_BUG
auto variations = adoptCF(static_cast<CFDictionaryRef>(CTFontCopyAttribute(originalFont, kCTFontVariationAttribute)));
if (!variations || !CFDictionaryGetCount(variations.get()) || CTFontDescriptorIsSystemUIFont(adoptCF(CTFontCopyFontDescriptor(originalFont)).get()))
#endif
{
UNUSED_PARAM(originalFont);
static CTFontDescriptorRef descriptor = nullptr;
if (descriptor)
return descriptor;
descriptor = CTFontDescriptorCreateWithAttributes(attributes);
return descriptor;
}
#if WORKAROUND_CORETEXT_VARIATIONS_WITH_FALLBACK_LIST_BUG
auto mutableAttributes = adoptCF(CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 2, attributes));
CFDictionaryAddValue(mutableAttributes.get(), kCTFontVariationAttribute, variations.get());
return adoptCF(CTFontDescriptorCreateWithAttributes(mutableAttributes.get()));
#endif
#undef WORKAROUND_CORETEXT_VARIATIONS_WITH_FALLBACK_LIST_BUG
}
CTFontRef FontPlatformData::ctFont() const
{
if (m_ctFont)
return m_ctFont.get();
ASSERT(m_font);
m_ctFont = adoptCF(CTFontCreateCopyWithAttributes(m_font.get(), m_size, nullptr, cascadeToLastResortAndVariationsFontDescriptor(m_font.get()).get()));
if (m_widthVariant != FontWidthVariant::RegularWidth) {
int featureTypeValue = kTextSpacingType;
int featureSelectorValue = mapFontWidthVariantToCTFeatureSelector(m_widthVariant);
RetainPtr<CTFontDescriptorRef> sourceDescriptor = adoptCF(CTFontCopyFontDescriptor(m_ctFont.get()));
RetainPtr<CFNumberRef> featureType = adoptCF(CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &featureTypeValue));
RetainPtr<CFNumberRef> featureSelector = adoptCF(CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &featureSelectorValue));
RetainPtr<CTFontDescriptorRef> newDescriptor = adoptCF(CTFontDescriptorCreateCopyWithFeature(sourceDescriptor.get(), featureType.get(), featureSelector.get()));
RetainPtr<CTFontRef> newFont = adoptCF(CTFontCreateWithFontDescriptor(newDescriptor.get(), m_size, 0));
if (newFont)
m_ctFont = newFont;
}
return m_ctFont.get();
}
RetainPtr<CFTypeRef> FontPlatformData::objectForEqualityCheck(CTFontRef ctFont)
{
auto fontDescriptor = adoptCF(CTFontCopyFontDescriptor(ctFont));
// FIXME: https://bugs.webkit.org/show_bug.cgi?id=138683 This is a shallow pointer compare for web fonts
// because the URL contains the address of the font. This means we might erroneously get false negatives.
RetainPtr<CFURLRef> url = adoptCF(static_cast<CFURLRef>(CTFontDescriptorCopyAttribute(fontDescriptor.get(), kCTFontReferenceURLAttribute)));
ASSERT(!url || CFGetTypeID(url.get()) == CFURLGetTypeID());
return url;
}
RetainPtr<CFTypeRef> FontPlatformData::objectForEqualityCheck() const
{
return objectForEqualityCheck(ctFont());
}
RefPtr<SharedBuffer> FontPlatformData::openTypeTable(uint32_t table) const
{
if (RetainPtr<CFDataRef> data = adoptCF(CTFontCopyTable(font(), table, kCTFontTableOptionNoOptions)))
return SharedBuffer::create(data.get());
return nullptr;
}
#if !LOG_DISABLED
String FontPlatformData::description() const
{
String fontDescription { adoptCF(CFCopyDescription(font())).get() };
return makeString(fontDescription, ' ', m_size,
(m_syntheticBold ? " synthetic bold" : ""),
(m_syntheticOblique ? " synthetic oblique" : ""),
(m_orientation == FontOrientation::Vertical ? " vertical orientation" : ""));
}
#endif
} // namespace WebCore