SimpleFontDataMac.mm [plain text]
/*
* Copyright (C) 2005, 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov
*
* 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
*/
#import "config.h"
#import "SimpleFontData.h"
#import "BlockExceptions.h"
#import "Color.h"
#import "FloatRect.h"
#import "Font.h"
#import "FontCache.h"
#import "FontDescription.h"
#import "SharedBuffer.h"
#import "WebCoreSystemInterface.h"
#import <CoreText/CoreText.h>
#import <float.h>
#import <unicode/uchar.h>
#import <wtf/Assertions.h>
#import <wtf/StdLibExtras.h>
#import <wtf/RetainPtr.h>
#include <wtf/UnusedParam.h>
using namespace std;
using namespace std;
namespace WebCore {
const float smallCapsFontSizeMultiplier = 0.7f;
static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return x / unitsPerEm; }
void SimpleFontData::platformInit()
{
m_syntheticBoldOffset = m_platformData.m_syntheticBold ? ceilf(GSFontGetSize(m_platformData.font()) / 24.0f) : 0.f;
m_spaceGlyph = 0;
m_spaceWidth = 0;
m_adjustedSpaceWidth = 0;
m_ascent = ceilf(GSFontGetAscent(m_platformData.font()));
m_descent = ceilf(-GSFontGetDescent(m_platformData.font()));
m_lineSpacing = GSFontGetLineSpacing(m_platformData.font());
m_lineGap = GSFontGetLineGap(m_platformData.font());
m_xHeight = GSFontGetXHeight(m_platformData.font());
m_unitsPerEm = GSFontGetUnitsPerEm(m_platformData.font());
}
void SimpleFontData::platformCharWidthInit()
{
m_avgCharWidth = 0;
m_maxCharWidth = 0;
// Fallback to a cross-platform estimate, which will populate these values if they are non-positive.
initCharWidths();
}
void SimpleFontData::platformDestroy()
{
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_smallCapsFontData) {
if (isCustomFont()) {
FontPlatformData smallCapsFontData(m_platformData);
smallCapsFontData.m_size = smallCapsFontData.m_size * smallCapsFontSizeMultiplier;
m_smallCapsFontData = new SimpleFontData(smallCapsFontData, true, false);
} else {
BEGIN_BLOCK_OBJC_EXCEPTIONS;
GSFontTraitMask fontTraits= GSFontGetTraits(m_platformData.font());
FontPlatformData smallCapsFont(GSFontCreateWithName(GSFontGetFamilyName(m_platformData.font()), fontTraits, GSFontGetSize(m_platformData.font()) * smallCapsFontSizeMultiplier));
// AppKit resets the type information (screen/printer) when you convert a font to a different size.
// We have to fix up the font that we're handed back.
UNUSED_PARAM(fontDescription);
if (smallCapsFont.font()) {
if (m_platformData.m_syntheticBold)
fontTraits |= GSBoldFontMask;
if (m_platformData.m_syntheticOblique)
fontTraits |= GSItalicFontMask;
GSFontTraitMask smallCapsFontTraits= GSFontGetTraits(smallCapsFont.font());
smallCapsFont.m_syntheticBold = (fontTraits & GSBoldFontMask) && !(smallCapsFontTraits & GSBoldFontMask);
smallCapsFont.m_syntheticOblique = (fontTraits & GSItalicFontMask) && !(smallCapsFontTraits & GSItalicFontMask);
m_smallCapsFontData = fontCache()->getCachedFontData(&smallCapsFont);
}
END_BLOCK_OBJC_EXCEPTIONS;
}
}
return m_smallCapsFontData;
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
UNUSED_PARAM(characters);
UNUSED_PARAM(length);
return 0;
}
void SimpleFontData::determinePitch()
{
GSFontRef f = m_platformData.font();
m_treatAsFixedPitch = false;
// GSFont is null in the case of SVG fonts for example.
if (f) {
const char *fullName = GSFontGetFullName(f);
const char *familyName = GSFontGetFamilyName(f);
m_treatAsFixedPitch = (GSFontIsFixedPitch(f) || (fullName && (strcasecmp(fullName, "Osaka-Mono") == 0 || strcasecmp(fullName, "MS-PGothic") == 0)));
if (familyName && strcasecmp(familyName, "Courier New") == 0) // Special case Courier New to not be treated as fixed pitch, as this will make use of a hacked space width which is undesireable for iPhone (see rdar://6269783)
m_treatAsFixedPitch = false;
}
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (platformData().m_isImageFont) {
// returns the proper scaled advance for the image size - see Font::drawGlyphs
return std::min(platformData().m_size + (platformData().m_size <= 15.0f ? 4.0f : 6.0f), 22.0f);
}
GSFontRef font = platformData().font();
float pointSize = GSFontGetSize(font);
CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);
CGSize advance;
if (!GSFontGetGlyphTransformedAdvances(font, &m, kCGFontRenderingModeAntialiased, &glyph, 1, &advance)) {
LOG_ERROR("Unable to cache glyph widths for %@ %f", GSFontGetFullName(font), pointSize);
advance.width = 0;
}
return advance.width + m_syntheticBoldOffset;
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
{
FloatRect boundingBox;
#ifndef BUILDING_ON_TIGER
CGRect box;
CGFontGetGlyphBBoxes(GSFontGetCGFont(platformData().font()), &glyph, 1, &box);
float pointSize = platformData().m_size;
CGFloat scale = pointSize / unitsPerEm();
boundingBox = CGRectApplyAffineTransform(box, CGAffineTransformMakeScale(scale, -scale));
if (m_syntheticBoldOffset)
boundingBox.setWidth(boundingBox.width() + m_syntheticBoldOffset);
#endif
return boundingBox;
}
#if USE(ATSUI)
void SimpleFontData::checkShapesArabic() const
{
ASSERT(!m_checkedShapesArabic);
m_checkedShapesArabic = true;
ATSUFontID fontID = m_platformData.m_atsuFontID;
if (!fontID) {
LOG_ERROR("unable to get ATSUFontID for %@", m_platformData.font());
return;
}
// This function is called only on fonts that contain Arabic glyphs. Our
// heuristic is that if such a font has a glyph metamorphosis table, then
// it includes shaping information for Arabic.
FourCharCode tables[] = { 'morx', 'mort' };
for (unsigned i = 0; i < sizeof(tables) / sizeof(tables[0]); ++i) {
ByteCount tableSize;
OSStatus status = ATSFontGetTable(fontID, tables[i], 0, 0, 0, &tableSize);
if (status == noErr) {
m_shapesArabic = true;
return;
}
if (status != kATSInvalidFontTableAccess)
LOG_ERROR("ATSFontGetTable failed (%d)", status);
}
}
#endif
#if USE(CORE_TEXT)
CTFontRef SimpleFontData::getCTFont() const
{
if (!m_CTFont) {
m_CTFont.adoptCF(CTFontCreateWithGraphicsFont(GSFontGetCGFont(m_platformData.font()), m_platformData.size(), &CGAffineTransformIdentity, NULL));
}
return m_CTFont.get();
}
CFDictionaryRef SimpleFontData::getCFStringAttributes(TypesettingFeatures typesettingFeatures) const
{
unsigned key = typesettingFeatures + 1;
pair<HashMap<unsigned, RetainPtr<CFDictionaryRef> >::iterator, bool> addResult = m_CFStringAttributes.add(key, RetainPtr<CFDictionaryRef>());
RetainPtr<CFDictionaryRef>& attributesDictionary = addResult.first->second;
if (!addResult.second)
return attributesDictionary.get();
bool allowLigatures = platformData().allowsLigatures() || (typesettingFeatures & Ligatures);
static const int ligaturesNotAllowedValue = 0;
static CFNumberRef ligaturesNotAllowed = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &ligaturesNotAllowedValue);
static const int ligaturesAllowedValue = 1;
static CFNumberRef ligaturesAllowed = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &ligaturesAllowedValue);
if (!(typesettingFeatures & Kerning)) {
static const float kerningAdjustmentValue = 0;
static CFNumberRef kerningAdjustment = CFNumberCreate(kCFAllocatorDefault, kCFNumberFloatType, &kerningAdjustmentValue);
static const void* keysWithKerningDisabled[] = { kCTFontAttributeName, kCTKernAttributeName, kCTLigatureAttributeName };
const void* valuesWithKerningDisabled[] = { getCTFont(), kerningAdjustment, allowLigatures
? ligaturesAllowed : ligaturesNotAllowed };
attributesDictionary.adoptCF(CFDictionaryCreate(NULL, keysWithKerningDisabled, valuesWithKerningDisabled,
sizeof(keysWithKerningDisabled) / sizeof(*keysWithKerningDisabled),
&kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks));
} else {
// By omitting the kCTKernAttributeName attribute, we get Core Text's standard kerning.
static const void* keysWithKerningEnabled[] = { kCTFontAttributeName, kCTLigatureAttributeName };
const void* valuesWithKerningEnabled[] = { getCTFont(), allowLigatures ? ligaturesAllowed : ligaturesNotAllowed };
attributesDictionary.adoptCF(CFDictionaryCreate(NULL, keysWithKerningEnabled, valuesWithKerningEnabled,
sizeof(keysWithKerningEnabled) / sizeof(*keysWithKerningEnabled),
&kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks));
}
return attributesDictionary.get();
}
#endif
} // namespace WebCore