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 <AppKit/AppKit.h>
#import <ApplicationServices/ApplicationServices.h>
#import <float.h>
#import <unicode/uchar.h>
#import <wtf/Assertions.h>
#import <wtf/StdLibExtras.h>
#import <wtf/RetainPtr.h>
#import <wtf/UnusedParam.h>
@interface NSFont (WebAppKitSecretAPI)
- (BOOL)_isFakeFixedPitch;
@end
using namespace std;
namespace WebCore {
const float smallCapsFontSizeMultiplier = 0.7f;
static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return x / unitsPerEm; }
static bool initFontData(SimpleFontData* fontData)
{
if (!fontData->platformData().cgFont())
return false;
return true;
}
static NSString *webFallbackFontFamily(void)
{
DEFINE_STATIC_LOCAL(RetainPtr<NSString>, webFallbackFontFamily, ([[NSFont systemFontOfSize:16.0f] familyName]));
return webFallbackFontFamily.get();
}
#if !ERROR_DISABLED
#if defined(__LP64__) || (!defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD))
static NSString* pathFromFont(NSFont*)
{
// FMGetATSFontRefFromFont is not available. As pathFromFont is only used for debugging purposes,
// returning nil is acceptable.
return nil;
}
#else
static NSString* pathFromFont(NSFont *font)
{
ATSFontRef atsFont = FMGetATSFontRefFromFont(CTFontGetPlatformFont(toCTFontRef(font), 0));
FSRef fileRef;
OSStatus status = ATSFontGetFileReference(atsFont, &fileRef);
if (status != noErr)
return nil;
UInt8 filePathBuffer[PATH_MAX];
status = FSRefMakePath(&fileRef, filePathBuffer, PATH_MAX);
if (status == noErr)
return [NSString stringWithUTF8String:(const char*)filePathBuffer];
return nil;
}
#endif // __LP64__
#endif // !ERROR_DISABLED
void SimpleFontData::platformInit()
{
#if USE(ATSUI)
m_ATSUMirrors = false;
m_checkedShapesArabic = false;
m_shapesArabic = false;
#endif
m_syntheticBoldOffset = m_platformData.m_syntheticBold ? 1.0f : 0.f;
bool failedSetup = false;
if (!initFontData(this)) {
// Ack! Something very bad happened, like a corrupt font.
// Try looking for an alternate 'base' font for this renderer.
// Special case hack to use "Times New Roman" in place of "Times".
// "Times RO" is a common font whose family name is "Times".
// It overrides the normal "Times" family font.
// It also appears to have a corrupt regular variant.
NSString *fallbackFontFamily;
if ([[m_platformData.font() familyName] isEqual:@"Times"])
fallbackFontFamily = @"Times New Roman";
else
fallbackFontFamily = webFallbackFontFamily();
// Try setting up the alternate font.
// This is a last ditch effort to use a substitute font when something has gone wrong.
#if !ERROR_DISABLED
RetainPtr<NSFont> initialFont = m_platformData.font();
#endif
if (m_platformData.font())
m_platformData.setFont([[NSFontManager sharedFontManager] convertFont:m_platformData.font() toFamily:fallbackFontFamily]);
else
m_platformData.setFont([NSFont fontWithName:fallbackFontFamily size:m_platformData.size()]);
#if !ERROR_DISABLED
NSString *filePath = pathFromFont(initialFont.get());
if (!filePath)
filePath = @"not known";
#endif
if (!initFontData(this)) {
if ([fallbackFontFamily isEqual:@"Times New Roman"]) {
// OK, couldn't setup Times New Roman as an alternate to Times, fallback
// on the system font. If this fails we have no alternative left.
m_platformData.setFont([[NSFontManager sharedFontManager] convertFont:m_platformData.font() toFamily:webFallbackFontFamily()]);
if (!initFontData(this)) {
// We tried, Times, Times New Roman, and the system font. No joy. We have to give up.
LOG_ERROR("unable to initialize with font %@ at %@", initialFont.get(), filePath);
failedSetup = true;
}
} else {
// We tried the requested font and the system font. No joy. We have to give up.
LOG_ERROR("unable to initialize with font %@ at %@", initialFont.get(), filePath);
failedSetup = true;
}
}
// Report the problem.
LOG_ERROR("Corrupt font detected, using %@ in place of %@ located at \"%@\".",
[m_platformData.font() familyName], [initialFont.get() familyName], filePath);
}
// If all else fails, try to set up using the system font.
// This is probably because Times and Times New Roman are both unavailable.
if (failedSetup) {
m_platformData.setFont([NSFont systemFontOfSize:[m_platformData.font() pointSize]]);
LOG_ERROR("failed to set up font, using system font %s", m_platformData.font());
initFontData(this);
}
int iAscent;
int iDescent;
int iLineGap;
unsigned unitsPerEm;
iAscent = CGFontGetAscent(m_platformData.cgFont());
// Some fonts erroneously specify a positive descender value. We follow Core Text in assuming that
// such fonts meant the same distance, but in the reverse direction.
iDescent = -abs(CGFontGetDescent(m_platformData.cgFont()));
iLineGap = CGFontGetLeading(m_platformData.cgFont());
unitsPerEm = CGFontGetUnitsPerEm(m_platformData.cgFont());
float pointSize = m_platformData.m_size;
float ascent = scaleEmToUnits(iAscent, unitsPerEm) * pointSize;
float descent = -scaleEmToUnits(iDescent, unitsPerEm) * pointSize;
float lineGap = scaleEmToUnits(iLineGap, unitsPerEm) * pointSize;
// We need to adjust Times, Helvetica, and Courier to closely match the
// vertical metrics of their Microsoft counterparts that are the de facto
// web standard. The AppKit adjustment of 20% is too big and is
// incorrectly added to line spacing, so we use a 15% adjustment instead
// and add it to the ascent.
NSString *familyName = [m_platformData.font() familyName];
if ([familyName isEqualToString:@"Times"] || [familyName isEqualToString:@"Helvetica"] || [familyName isEqualToString:@"Courier"])
ascent += floorf(((ascent + descent) * 0.15f) + 0.5f);
#if defined(BUILDING_ON_LEOPARD)
else if ([familyName isEqualToString:@"Geeza Pro"]) {
// Geeza Pro has glyphs that draw slightly above the ascent or far below the descent. Adjust
// those vertical metrics to better match reality, so that diacritics at the bottom of one line
// do not overlap diacritics at the top of the next line.
ascent *= 1.08f;
descent *= 2.f;
}
#endif
// Compute and store line spacing, before the line metrics hacks are applied.
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
// Hack Hiragino line metrics to allow room for marked text underlines.
// <rdar://problem/5386183>
if (descent < 3 && lineGap >= 3 && [familyName hasPrefix:@"Hiragino"]) {
lineGap -= 3 - descent;
descent = 3;
}
if (platformData().orientation() == Vertical && !isTextOrientationFallback()) {
// The check doesn't look neat but this is what AppKit does for vertical writing...
RetainPtr<CFArrayRef> tableTags(AdoptCF, CTFontCopyAvailableTables(m_platformData.ctFont(), kCTFontTableOptionExcludeSynthetic));
CFIndex numTables = CFArrayGetCount(tableTags.get());
for (CFIndex index = 0; index < numTables; ++index) {
CTFontTableTag tag = (CTFontTableTag)(uintptr_t)CFArrayGetValueAtIndex(tableTags.get(), index);
if (tag == kCTFontTableVhea || tag == kCTFontTableVORG) {
m_hasVerticalGlyphs = true;
break;
}
}
}
float xHeight;
if (platformData().orientation() == Horizontal) {
// Measure the actual character "x", since it's possible for it to extend below the baseline, and we need the
// reported x-height to only include the portion of the glyph that is above the baseline.
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
NSGlyph xGlyph = glyphPageZero ? glyphPageZero->glyphDataForCharacter('x').glyph : 0;
if (xGlyph)
xHeight = -CGRectGetMinY(platformBoundsForGlyph(xGlyph));
else
xHeight = scaleEmToUnits(CGFontGetXHeight(m_platformData.cgFont()), unitsPerEm) * pointSize;
} else
xHeight = verticalRightOrientationFontData()->fontMetrics().xHeight();
m_fontMetrics.setUnitsPerEm(unitsPerEm);
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setXHeight(xHeight);
}
static CFDataRef copyFontTableForTag(FontPlatformData& platformData, FourCharCode tableName)
{
return CGFontCopyTableForTag(platformData.cgFont(), tableName);
}
void SimpleFontData::platformCharWidthInit()
{
m_avgCharWidth = 0;
m_maxCharWidth = 0;
RetainPtr<CFDataRef> os2Table(AdoptCF, copyFontTableForTag(m_platformData, 'OS/2'));
if (os2Table && CFDataGetLength(os2Table.get()) >= 4) {
const UInt8* os2 = CFDataGetBytePtr(os2Table.get());
SInt16 os2AvgCharWidth = os2[2] * 256 + os2[3];
m_avgCharWidth = scaleEmToUnits(os2AvgCharWidth, m_fontMetrics.unitsPerEm()) * m_platformData.m_size;
}
RetainPtr<CFDataRef> headTable(AdoptCF, copyFontTableForTag(m_platformData, 'head'));
if (headTable && CFDataGetLength(headTable.get()) >= 42) {
const UInt8* head = CFDataGetBytePtr(headTable.get());
ushort uxMin = head[36] * 256 + head[37];
ushort uxMax = head[40] * 256 + head[41];
SInt16 xMin = static_cast<SInt16>(uxMin);
SInt16 xMax = static_cast<SInt16>(uxMax);
float diff = static_cast<float>(xMax - xMin);
m_maxCharWidth = scaleEmToUnits(diff, m_fontMetrics.unitsPerEm()) * m_platformData.m_size;
}
// Fallback to a cross-platform estimate, which will populate these values if they are non-positive.
initCharWidths();
}
void SimpleFontData::platformDestroy()
{
if (!isCustomFont() && m_derivedFontData) {
// These come from the cache.
if (m_derivedFontData->smallCaps)
fontCache()->releaseFontData(m_derivedFontData->smallCaps.leakPtr());
if (m_derivedFontData->emphasisMark)
fontCache()->releaseFontData(m_derivedFontData->emphasisMark.leakPtr());
}
#if USE(ATSUI)
HashMap<unsigned, ATSUStyle>::iterator end = m_ATSUStyleMap.end();
for (HashMap<unsigned, ATSUStyle>::iterator it = m_ATSUStyleMap.begin(); it != end; ++it)
ATSUDisposeStyle(it->second);
#endif
}
PassOwnPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescription& fontDescription, float scaleFactor) const
{
if (isCustomFont()) {
FontPlatformData scaledFontData(m_platformData);
scaledFontData.m_size = scaledFontData.m_size * scaleFactor;
return adoptPtr(new SimpleFontData(scaledFontData, true, false));
}
BEGIN_BLOCK_OBJC_EXCEPTIONS;
float size = m_platformData.size() * scaleFactor;
FontPlatformData scaledFontData([[NSFontManager sharedFontManager] convertFont:m_platformData.font() toSize:size], size, false, false, m_platformData.orientation());
// 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.
scaledFontData.setFont(fontDescription.usePrinterFont() ? [scaledFontData.font() printerFont] : [scaledFontData.font() screenFont]);
if (scaledFontData.font()) {
NSFontManager *fontManager = [NSFontManager sharedFontManager];
NSFontTraitMask fontTraits = [fontManager traitsOfFont:m_platformData.font()];
if (m_platformData.m_syntheticBold)
fontTraits |= NSBoldFontMask;
if (m_platformData.m_syntheticOblique)
fontTraits |= NSItalicFontMask;
NSFontTraitMask scaledFontTraits = [fontManager traitsOfFont:scaledFontData.font()];
scaledFontData.m_syntheticBold = (fontTraits & NSBoldFontMask) && !(scaledFontTraits & NSBoldFontMask);
scaledFontData.m_syntheticOblique = (fontTraits & NSItalicFontMask) && !(scaledFontTraits & NSItalicFontMask);
// SimpleFontData::platformDestroy() takes care of not deleting the cached font data twice.
return adoptPtr(fontCache()->getCachedFontData(&scaledFontData));
}
END_BLOCK_OBJC_EXCEPTIONS;
return nullptr;
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->smallCaps)
m_derivedFontData->smallCaps = createScaledFontData(fontDescription, smallCapsFontSizeMultiplier);
return m_derivedFontData->smallCaps.get();
}
SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->emphasisMark)
m_derivedFontData->emphasisMark = createScaledFontData(fontDescription, .5f);
return m_derivedFontData->emphasisMark.get();
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
NSString *string = [[NSString alloc] initWithCharactersNoCopy:const_cast<unichar*>(characters) length:length freeWhenDone:NO];
NSCharacterSet *set = [[m_platformData.font() coveredCharacterSet] invertedSet];
bool result = set && [string rangeOfCharacterFromSet:set].location == NSNotFound;
[string release];
return result;
}
void SimpleFontData::determinePitch()
{
NSFont* f = m_platformData.font();
// Special case Osaka-Mono.
// According to <rdar://problem/3999467>, we should treat Osaka-Mono as fixed pitch.
// Note that the AppKit does not report Osaka-Mono as fixed pitch.
// Special case MS-PGothic.
// According to <rdar://problem/4032938>, we should not treat MS-PGothic as fixed pitch.
// Note that AppKit does report MS-PGothic as fixed pitch.
// Special case MonotypeCorsiva
// According to <rdar://problem/5454704>, we should not treat MonotypeCorsiva as fixed pitch.
// Note that AppKit does report MonotypeCorsiva as fixed pitch.
NSString *name = [f fontName];
m_treatAsFixedPitch = ([f isFixedPitch] || [f _isFakeFixedPitch] ||
[name caseInsensitiveCompare:@"Osaka-Mono"] == NSOrderedSame) &&
[name caseInsensitiveCompare:@"MS-PGothic"] != NSOrderedSame &&
[name caseInsensitiveCompare:@"MonotypeCorsiva"] != NSOrderedSame;
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
{
FloatRect boundingBox;
boundingBox = CTFontGetBoundingRectsForGlyphs(m_platformData.ctFont(), platformData().orientation() == Vertical ? kCTFontVerticalOrientation : kCTFontHorizontalOrientation, &glyph, 0, 1);
boundingBox.setY(-boundingBox.maxY());
if (m_syntheticBoldOffset)
boundingBox.setWidth(boundingBox.width() + m_syntheticBoldOffset);
return boundingBox;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
CGSize advance;
if (platformData().orientation() == Horizontal || m_isBrokenIdeographFallback) {
NSFont* font = platformData().font();
float pointSize = platformData().m_size;
CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);
if (!wkGetGlyphTransformedAdvances(platformData().cgFont(), font, &m, &glyph, &advance)) {
LOG_ERROR("Unable to cache glyph widths for %@ %f", [font displayName], pointSize);
advance.width = 0;
}
} else
CTFontGetAdvancesForGlyphs(m_platformData.ctFont(), kCTFontVerticalOrientation, &glyph, &advance, 1);
return advance.width + m_syntheticBoldOffset;
}
} // namespace WebCore