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 "PlatformString.h"
#import "WebCoreSystemInterface.h"
#import <CoreText/CoreText.h>
namespace WebCore {
// These CoreText Text Spacing feature selectors are not defined in CoreText.
enum TextSpacingCTFeatureSelector { TextSpacingProportional, TextSpacingFullWidth, TextSpacingHalfWidth, TextSpacingThirdWidth, TextSpacingQuarterWidth };
FontPlatformData::FontPlatformData(GSFontRef gsFont, float size, bool syntheticBold, bool syntheticOblique, FontOrientation orientation,
TextOrientation textOrientation, FontWidthVariant widthVariant)
: m_syntheticBold(syntheticBold)
, m_syntheticOblique(syntheticOblique)
, m_orientation(orientation)
, m_textOrientation(textOrientation)
, m_isEmoji(false)
, m_size(size)
, m_widthVariant(widthVariant)
, m_font(gsFont)
, m_cgFont(GSFontGetCGFont(gsFont))
, m_isColorBitmapFont(GSFontHasColorGlyphs(gsFont))
{
ASSERT_ARG(gsFont, gsFont);
CFRetain(gsFont);
}
FontPlatformData::FontPlatformData(CTFontRef ctFont, float size, bool syntheticBold, bool syntheticOblique, FontOrientation orientation, TextOrientation textOrientation, FontWidthVariant widthVariant)
: m_syntheticBold(syntheticBold)
, m_syntheticOblique(syntheticOblique)
, m_orientation(orientation)
, m_textOrientation(textOrientation)
, m_isEmoji(false)
, m_size(size)
, m_widthVariant(widthVariant)
, m_cgFont(AdoptCF, CTFontCopyGraphicsFont(ctFont, 0))
, m_isColorBitmapFont(false)
{
ASSERT_ARG(ctFont, ctFont);
const char* postScriptName = CGFontGetPostScriptName(m_cgFont.get());
if (!postScriptName)
return;
m_font = GSFontCreateWithName(postScriptName, 0, m_size);
m_isColorBitmapFont = GSFontHasColorGlyphs(m_font);
m_isEmoji = !strcmp("AppleColorEmoji", postScriptName);
}
FontPlatformData:: ~FontPlatformData()
{
if (m_font && m_font != reinterpret_cast<GSFontRef>(-1))
CFRelease(m_font);
}
void FontPlatformData::platformDataInit(const FontPlatformData& f)
{
m_font = f.m_font && f.m_font != reinterpret_cast<GSFontRef>(-1) ? static_cast<GSFontRef>(const_cast<void *>(CFRetain(f.m_font))) : f.m_font;
m_isEmoji = f.m_isEmoji;
m_cgFont = f.m_cgFont;
m_CTFont = f.m_CTFont;
#if PLATFORM(CHROMIUM) && OS(DARWIN)
m_inMemoryFont = f.m_inMemoryFont;
#endif
}
const FontPlatformData& FontPlatformData::platformDataAssign(const FontPlatformData& f)
{
m_cgFont = f.m_cgFont;
m_isEmoji = f.m_isEmoji;
if (m_font == f.m_font)
return *this;
if (f.m_font && f.m_font != reinterpret_cast<GSFontRef>(-1))
CFRetain(f.m_font);
if (m_font && m_font != reinterpret_cast<GSFontRef>(-1))
CFRelease(m_font);
m_font = f.m_font;
m_CTFont = f.m_CTFont;
#if PLATFORM(CHROMIUM) && OS(DARWIN)
m_inMemoryFont = f.m_inMemoryFont;
#endif
return *this;
}
bool FontPlatformData::platformIsEqual(const FontPlatformData& other) const
{
if (m_font || other.m_font) {
#ifndef NDEBUG
if (m_font == other.m_font)
ASSERT(m_isEmoji == other.m_isEmoji);
#endif
return m_font == other.m_font;
}
#ifndef NDEBUG
if (m_cgFont == other.m_cgFont)
ASSERT(m_isEmoji == other.m_isEmoji);
#endif
return m_cgFont == other.m_cgFont;
}
void FontPlatformData::setFont(GSFontRef font)
{
ASSERT_ARG(font, font);
ASSERT(m_font != reinterpret_cast<GSFontRef>(-1));
if (m_font == font)
return;
CFRetain(font);
if (m_font)
CFRelease(m_font);
m_font = font;
m_size = GSFontGetSize(font);
m_cgFont = GSFontGetCGFont(font);
m_isColorBitmapFont = GSFontHasColorGlyphs(font);
}
bool FontPlatformData::allowsLigatures() const
{
if (!m_font)
return false;
RetainPtr<CFCharacterSetRef> characterSet(AdoptCF, CTFontCopyCharacterSet(ctFont()));
return !(characterSet.get() && CFCharacterSetIsCharacterMember(characterSet.get(), 'a'));
}
inline int mapFontWidthVariantToCTFeatureSelector(FontWidthVariant variant)
{
switch(variant) {
case RegularWidth:
return TextSpacingProportional;
case HalfWidth:
return TextSpacingHalfWidth;
case ThirdWidth:
return TextSpacingThirdWidth;
case QuarterWidth:
return TextSpacingQuarterWidth;
}
ASSERT_NOT_REACHED();
return TextSpacingProportional;
}
CTFontRef FontPlatformData::ctFont() const
{
if (m_widthVariant == RegularWidth) {
if (!m_CTFont) {
// Apple Color Emoji size is adjusted (and then re-adjusted by Core Text) and capped.
CGFloat size = !m_isEmoji ? m_size : m_size <= 15 ? 4 * (m_size + 2) / static_cast<CGFloat>(5) : 16;
m_CTFont.adoptCF(CTFontCreateWithGraphicsFont(m_cgFont.get(), size, 0, 0));
}
return m_CTFont.get();
}
if (!m_CTFont) {
int featureTypeValue = kTextSpacingType;
int featureSelectorValue = mapFontWidthVariantToCTFeatureSelector(m_widthVariant);
RetainPtr<CTFontRef> sourceFont(AdoptCF, CTFontCreateWithGraphicsFont(m_cgFont.get(), m_size, 0, 0));
RetainPtr<CTFontDescriptorRef> sourceDescriptor(AdoptCF, CTFontCopyFontDescriptor(sourceFont.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));
m_CTFont = newFont.get() ? newFont : sourceFont;
}
return m_CTFont.get();
}
#ifndef NDEBUG
String FontPlatformData::description() const
{
RetainPtr<CFStringRef> cgFontDescription(AdoptCF, CFCopyDescription(cgFont()));
return String(cgFontDescription.get()) + " " + String::number(m_size)
+ (m_syntheticBold ? " synthetic bold" : "") + (m_syntheticOblique ? " synthetic oblique" : "") + (m_orientation ? " vertical orientation" : "");
}
#endif
} // namespace WebCore