xref: /aoo41x/main/vcl/aqua/source/gdi/ctfonts.cxx (revision 2822fc04)

/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_vcl.hxx"

#include "impfont.hxx"
#include "outfont.hxx"
#include "sallayout.hxx"

#include "aqua/salinst.h"
#include "aqua/saldata.hxx"
#include "aqua/salgdi.h"
#include "ctfonts.hxx"

#include "basegfx/polygon/b2dpolygon.hxx"
#include "basegfx/matrix/b2dhommatrix.hxx"

#ifndef DISABLE_CORETEXT_DYNLOAD
#include <dlfcn.h>
#endif

// =======================================================================

// CoreText specific physically available font face
class CTFontData
:	public ImplMacFontData
{
public:
	explicit				CTFontData( const ImplDevFontAttributes&, sal_IntPtr nFontId );
	virtual					~CTFontData( void );
	virtual ImplFontData*   Clone( void ) const;

	virtual ImplMacTextStyle*	CreateMacTextStyle( const ImplFontSelectData& ) const;
	virtual ImplFontEntry*		CreateFontInstance( /*const*/ ImplFontSelectData& ) const;
	virtual int					GetFontTable( const char pTagName[5], unsigned char* ) const;
};

// =======================================================================

class CTFontList
:	public SystemFontList
{
public:
	explicit	CTFontList( void );
	virtual		~CTFontList( void );

	bool		Init( void );
	void		AddFont( CTFontData* );

	virtual void    AnnounceFonts( ImplDevFontList& ) const;
	virtual ImplMacFontData* GetFontDataFromId( sal_IntPtr ) const;

private:
	CTFontCollectionRef mpCTFontCollection;
	CFArrayRef mpCTFontArray;

	typedef std::hash_map<sal_IntPtr,CTFontData*> CTFontContainer;
	CTFontContainer	maFontContainer;
};

// =======================================================================

CTTextStyle::CTTextStyle( const ImplFontSelectData& rFSD )
:	ImplMacTextStyle( rFSD )
,	mpStyleDict( NULL )
{
	mpFontData = (CTFontData*)rFSD.mpFontData;
	const ImplFontSelectData* const pReqFont = &rFSD;

	double fScaledFontHeight = pReqFont->mfExactHeight;
#if 0 // TODO: does CoreText need font size limiting???
	static const float fMaxFontHeight = 144.0; // TODO: is there a limit for CoreText?
	if( fScaledFontHeight > fMaxFontHeight )
	{
		mfFontScale = fScaledFontHeight / fMaxFontHeight;
		fScaledFontHeight = fMaxFontHeight;
	}
#endif

	// convert font rotation to radian
	mfFontRotation = pReqFont->mnOrientation * (M_PI / 1800.0);

	// handle font stretching if any
	const CGAffineTransform* pMatrix = NULL;
	CGAffineTransform aMatrix;
	if( (pReqFont->mnWidth != 0) && (pReqFont->mnWidth != pReqFont->mnHeight) )
	{
		mfFontStretch = (float)pReqFont->mnWidth / pReqFont->mnHeight;
		aMatrix = CGAffineTransformMakeScale( mfFontStretch, 1.0F );
		pMatrix = &aMatrix;
	}

	// create the style object for CoreText font attributes
	static const CFIndex nMaxDictSize = 16; // TODO: does this really suffice?
	mpStyleDict = CFDictionaryCreateMutable( NULL, nMaxDictSize,
		&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks );

	// set some default styles: no kerning, regular ligatures
	static const CGFloat fValZero = 0.0;
	CFNumberRef pCFFloatNumZero = CFNumberCreate( NULL, kCFNumberFloatType, &fValZero );
	CFDictionarySetValue( mpStyleDict, kCTKernAttributeName, pCFFloatNumZero );
	CFRelease( pCFFloatNumZero);
	static const int nValOne = 1;
	CFNumberRef pCFIntNumOne = CFNumberCreate( NULL, kCFNumberIntType, &nValOne );
	CFDictionarySetValue( mpStyleDict, kCTLigatureAttributeName, pCFIntNumOne );
	CFRelease( pCFIntNumOne);
	CFBooleanRef pCFVertBool = pReqFont->mbVertical ? kCFBooleanTrue : kCFBooleanFalse;
	CFDictionarySetValue( mpStyleDict, kCTVerticalFormsAttributeName, pCFVertBool );

	CTFontDescriptorRef pFontDesc = (CTFontDescriptorRef)mpFontData->GetFontId();
	CTFontRef pNewCTFont = CTFontCreateWithFontDescriptor( pFontDesc, fScaledFontHeight, pMatrix );
	CFDictionarySetValue( mpStyleDict, kCTFontAttributeName, pNewCTFont );
	CFRelease( pNewCTFont);

#if 0 // LastResort is implicit in CoreText's font cascading
	const void* aGFBDescriptors[] = { CTFontDescriptorCreateWithNameAndSize( CFSTR("LastResort"), 0) }; // TODO: use the full GFB list
	const int nGfbCount = sizeof(aGFBDescriptors) / sizeof(*aGFBDescriptors);
	CFArrayRef pGfbList = CFArrayCreate( NULL, aGFBDescriptors, nGfbCount, &kCFTypeArrayCallBacks);
	CFDictionaryAddValue( mpStyleDict, kCTFontCascadeListAttribute, pGfbList);
	CFRelease( pGfbList);
#endif
}

// -----------------------------------------------------------------------

CTTextStyle::~CTTextStyle( void )
{
	if( mpStyleDict )
		CFRelease( mpStyleDict );
}

// -----------------------------------------------------------------------

void CTTextStyle::GetFontMetric( float fDPIY, ImplFontMetricData& rMetric ) const
{
	// get the matching CoreText font handle
	// TODO: is it worth it to cache the CTFontRef in SetFont() and reuse it here?
	CTFontRef aCTFontRef = (CTFontRef)CFDictionaryGetValue( mpStyleDict, kCTFontAttributeName );

	const double fPixelSize = (mfFontScale * fDPIY);
	rMetric.mnAscent       = lrint( CTFontGetAscent( aCTFontRef ) * fPixelSize);
	rMetric.mnDescent      = lrint( CTFontGetDescent( aCTFontRef ) * fPixelSize);
	rMetric.mnIntLeading   = lrint( CTFontGetLeading( aCTFontRef ) * fPixelSize);
	rMetric.mnExtLeading   = 0;
	// since ImplFontMetricData::mnWidth is only used for stretching/squeezing fonts
	// setting this width to the pixel height of the fontsize is good enough
	// it also makes the calculation of the stretch factor simple
	rMetric.mnWidth        = lrint( CTFontGetSize( aCTFontRef ) * fPixelSize * mfFontStretch);

	// all CoreText fonts are scalable
	rMetric.mbScalableFont = true;
	// TODO: check if any kerning is supported
	rMetric.mbKernableFont = true;
}

// -----------------------------------------------------------------------

bool CTTextStyle::GetGlyphBoundRect( sal_GlyphId aGlyphId, Rectangle& rRect ) const
{
	const DynCoreTextSyms& rCT = DynCoreTextSyms::get();
	CGGlyph nCGGlyph = aGlyphId & GF_IDXMASK; // NOTE: CoreText handles glyph fallback itself
	CTFontRef aCTFontRef = (CTFontRef)CFDictionaryGetValue( mpStyleDict, kCTFontAttributeName );

	const CTFontOrientation aFontOrientation = kCTFontDefaultOrientation; // TODO: horz/vert
	const CGRect aCGRect = rCT.FontGetBoundingRectsForGlyphs( aCTFontRef, aFontOrientation, &nCGGlyph, NULL, 1 );

	rRect.Left()   = lrint( mfFontScale * aCGRect.origin.x );
	rRect.Top()    = lrint( mfFontScale * aCGRect.origin.y );
	rRect.Right()  = lrint( mfFontScale * (aCGRect.origin.x + aCGRect.size.width) );
	rRect.Bottom() = lrint( mfFontScale * (aCGRect.origin.y + aCGRect.size.height) );
	return true;
}

// -----------------------------------------------------------------------

// callbacks from CTFontCreatePathForGlyph+CGPathApply for GetGlyphOutline()
struct GgoData { basegfx::B2DPolygon maPolygon; basegfx::B2DPolyPolygon* mpPolyPoly; };

static void MyCGPathApplierFunc( void* pData, const CGPathElement* pElement )
{
	basegfx::B2DPolygon& rPolygon = static_cast<GgoData*>(pData)->maPolygon;
	const int nPointCount = rPolygon.count();

	switch( pElement->type )
	{
	case kCGPathElementCloseSubpath:
	case kCGPathElementMoveToPoint:
		if( nPointCount > 0 ) {
			static_cast<GgoData*>(pData)->mpPolyPoly->append( rPolygon );
			rPolygon.clear();
		}
		// fall through for kCGPathElementMoveToPoint:
		if( pElement->type != kCGPathElementMoveToPoint )
			break;
	case kCGPathElementAddLineToPoint:
		rPolygon.append( basegfx::B2DPoint( +pElement->points[0].x, -pElement->points[0].y ) );
		break;
	case kCGPathElementAddCurveToPoint:
		rPolygon.append( basegfx::B2DPoint( +pElement->points[2].x, -pElement->points[2].y ) );
		rPolygon.setNextControlPoint( nPointCount-1, basegfx::B2DPoint( pElement->points[0].x, -pElement->points[0].y ) );
		rPolygon.setPrevControlPoint( nPointCount+0, basegfx::B2DPoint( pElement->points[1].x, -pElement->points[1].y ) );
		break;
	case kCGPathElementAddQuadCurveToPoint: {
		const basegfx::B2DPoint aStartPt = rPolygon.getB2DPoint( nPointCount-1 );
		const basegfx::B2DPoint aCtrPt1( (aStartPt.getX() + 2* pElement->points[0].x) / 3.0,
					(aStartPt.getY() - 2 * pElement->points[0].y) / 3.0 );
		const basegfx::B2DPoint aCtrPt2( (+2 * +pElement->points[0].x + pElement->points[1].x) / 3.0,
				(-2 * pElement->points[0].y - pElement->points[1].y) / 3.0 );
		rPolygon.append( basegfx::B2DPoint( +pElement->points[1].x, -pElement->points[1].y ) );
		rPolygon.setNextControlPoint( nPointCount-1, aCtrPt1 );
		rPolygon.setPrevControlPoint( nPointCount+0, aCtrPt2 );
		} break;
	}
}

bool CTTextStyle::GetGlyphOutline( sal_GlyphId aGlyphId, basegfx::B2DPolyPolygon& rResult ) const
{
	rResult.clear();

	const DynCoreTextSyms& rCT = DynCoreTextSyms::get();
	// TODO: GF_FONTMASK if using non-native glyph fallback
	CGGlyph nCGGlyph = aGlyphId & GF_IDXMASK;
	CTFontRef pCTFont = (CTFontRef)CFDictionaryGetValue( mpStyleDict, kCTFontAttributeName );
	CGPathRef xPath = rCT.FontCreatePathForGlyph( pCTFont, nCGGlyph, NULL );

	GgoData aGgoData;
	aGgoData.mpPolyPoly = &rResult;
	CGPathApply( xPath, (void*)&aGgoData, MyCGPathApplierFunc );
#if 0 // TODO: does OSX ensure that the last polygon is always closed?
	const CGPathElement aClosingElement = { kCGPathElementCloseSubpath, NULL };
	MyCGPathApplierFunc( (void*)&aGgoData, &aClosingElement );
#endif

	// apply the font scale
	if( mfFontScale != 1.0 ) {
		basegfx::B2DHomMatrix aScale;
		aScale.scale( +mfFontScale, +mfFontScale );
		rResult.transform( aScale );
	}

	return true;
}

// -----------------------------------------------------------------------

void CTTextStyle::SetTextColor( const RGBAColor& rColor )
{
#if (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5)
	CGColorRef pCGColor = CGColorCreateGenericRGB( rColor.GetRed(),
		rColor.GetGreen(), rColor.GetBlue(), rColor.GetAlpha() );
#else // for builds on OSX 10.4 SDK
	const CGColorSpaceRef pCGColorSpace = GetSalData()->mxRGBSpace;
	CGColorRef pCGColor = CGColorCreate( pCGColorSpace, rColor.AsArray() );
#endif
	CFDictionarySetValue( mpStyleDict, kCTForegroundColorAttributeName, pCGColor );
	CFRelease( pCGColor);
}

// =======================================================================

CTFontData::CTFontData( const ImplDevFontAttributes& rDFA, sal_IntPtr nFontId )
:	ImplMacFontData( rDFA, nFontId )
{}

// -----------------------------------------------------------------------

CTFontData::~CTFontData( void )
{
	// TODO: any resources to release?
}

// -----------------------------------------------------------------------

ImplFontData* CTFontData::Clone( void ) const
{
	return new CTFontData( *this);
}

// -----------------------------------------------------------------------

ImplMacTextStyle* CTFontData::CreateMacTextStyle( const ImplFontSelectData& rFSD ) const
{
	return new CTTextStyle( rFSD);
}

// -----------------------------------------------------------------------

ImplFontEntry* CTFontData::CreateFontInstance( /*const*/ ImplFontSelectData& rFSD ) const
{
	return new ImplFontEntry( rFSD);
}

// -----------------------------------------------------------------------

int CTFontData::GetFontTable( const char pTagName[5], unsigned char* pResultBuf ) const
{
	DBG_ASSERT( pTagName[4]=='\0', "CTFontData::GetFontTable with invalid tagname!\n" );

	const CTFontTableTag nTagCode = (pTagName[0]<<24) + (pTagName[1]<<16) + (pTagName[2]<<8) + (pTagName[3]<<0);

	// get the raw table length
	CTFontDescriptorRef pFontDesc = reinterpret_cast<CTFontDescriptorRef>( GetFontId());
	CTFontRef rCTFont = CTFontCreateWithFontDescriptor( pFontDesc, 0.0, NULL);
	CFDataRef pDataRef = CTFontCopyTable( rCTFont, nTagCode, kCTFontTableOptionExcludeSynthetic);
	CFRelease( rCTFont);
	if( !pDataRef)
		return 0;

	const CFIndex nByteLength = CFDataGetLength( pDataRef);

	// get the raw table data if requested
	if( pResultBuf && (nByteLength > 0))
	{
		const CFRange aFullRange = CFRangeMake( 0, nByteLength);
		CFDataGetBytes( pDataRef, aFullRange, (UInt8*)pResultBuf);
	}

	CFRelease( pDataRef);

	return (int)nByteLength;
}

// =======================================================================

static void CTFontEnumCallBack( const void* pValue, void* pContext )
{
	CTFontDescriptorRef pFD = static_cast<CTFontDescriptorRef>(pValue);

	// all CoreText fonts are device fonts that can rotate just fine
	ImplDevFontAttributes rDFA;
	rDFA.mbOrientation = true;
	rDFA.mbDevice      = true;
	rDFA.mnQuality     = 0;

	// reset the font attributes
	rDFA.meFamily     = FAMILY_DONTKNOW;
	rDFA.mePitch      = PITCH_VARIABLE;
	rDFA.meWidthType  = WIDTH_NORMAL;
	rDFA.meWeight     = WEIGHT_NORMAL;
	rDFA.meItalic     = ITALIC_NONE;
	rDFA.mbSymbolFlag = false;

	// all scalable fonts on this platform are subsettable
	rDFA.mbEmbeddable = false;
	rDFA.mbSubsettable = true;

	// get font name
	// TODO: use kCTFontDisplayNameAttribute instead???
	CFStringRef pFamilyName = (CFStringRef)CTFontDescriptorCopyAttribute( pFD, kCTFontFamilyNameAttribute );
	rDFA.maName = GetOUString( pFamilyName );
	// get font style
	CFStringRef pStyleName = (CFStringRef)CTFontDescriptorCopyAttribute( pFD, kCTFontStyleNameAttribute );
	rDFA.maStyleName = GetOUString( pStyleName );

	// get font-enabled status
	int bFontEnabled = FALSE;
	CFNumberRef pFontEnabled = (CFNumberRef)CTFontDescriptorCopyAttribute( pFD, kCTFontEnabledAttribute );
	CFNumberGetValue( pFontEnabled, kCFNumberIntType, &bFontEnabled );

	// get font attributes
	CFDictionaryRef pAttrDict = (CFDictionaryRef)CTFontDescriptorCopyAttribute( pFD, kCTFontTraitsAttribute );

	// get symbolic trait
	// TODO: use other traits such as MonoSpace/Condensed/Expanded or Vertical too
	SInt64 nSymbolTrait = 0;
	CFNumberRef pSymbolNum = NULL;
	if( CFDictionaryGetValueIfPresent( pAttrDict, kCTFontSymbolicTrait, (const void**)&pSymbolNum ) ) {
		CFNumberGetValue( pSymbolNum, kCFNumberSInt64Type, &nSymbolTrait );
		rDFA.mbSymbolFlag = ((nSymbolTrait & kCTFontClassMaskTrait) == kCTFontSymbolicClass);
	}

	// get the font weight
	double fWeight = 0;
	CFNumberRef pWeightNum = (CFNumberRef)CFDictionaryGetValue( pAttrDict, kCTFontWeightTrait );
	CFNumberGetValue( pWeightNum, kCFNumberDoubleType, &fWeight );
	int nInt = WEIGHT_NORMAL;
	if( fWeight > 0 ) {
		nInt = rint(WEIGHT_NORMAL + fWeight * ((WEIGHT_BLACK - WEIGHT_NORMAL)/0.68));
		if( nInt > WEIGHT_BLACK )
			nInt = WEIGHT_BLACK;
	} else if( fWeight < 0 ) {
		nInt = rint(WEIGHT_NORMAL + fWeight * ((WEIGHT_NORMAL - WEIGHT_THIN)/0.9));
		if( nInt < WEIGHT_THIN )
			nInt = WEIGHT_THIN;
	}
	rDFA.meWeight = (FontWeight)nInt;

	// get the font slant
	double fSlant = 0;
	CFNumberRef pSlantNum = (CFNumberRef)CFDictionaryGetValue( pAttrDict, kCTFontSlantTrait );
	CFNumberGetValue( pSlantNum, kCFNumberDoubleType, &fSlant );
	if( fSlant >= 0.035 )
		rDFA.meItalic = ITALIC_NORMAL;

	// get width trait
	double fWidth = 0;
	CFNumberRef pWidthNum = (CFNumberRef)CFDictionaryGetValue( pAttrDict, kCTFontWidthTrait );
	CFNumberGetValue( pWidthNum, kCFNumberDoubleType, &fWidth );
	nInt = WIDTH_NORMAL;
	if( fWidth > 0 ) {
		nInt = rint( WIDTH_NORMAL + fWidth * ((WIDTH_ULTRA_EXPANDED - WIDTH_NORMAL)/0.4));
		if( nInt > WIDTH_ULTRA_EXPANDED )
			nInt = WIDTH_ULTRA_EXPANDED;
	} else if( fWidth < 0 ) {
		nInt = rint( WIDTH_NORMAL + fWidth * ((WIDTH_NORMAL - WIDTH_ULTRA_CONDENSED)/0.5));
		if( nInt < WIDTH_ULTRA_CONDENSED )
			nInt = WIDTH_ULTRA_CONDENSED;
	}
	rDFA.meWidthType = (FontWidth)nInt;

	// release the attribute dict that we had copied
	CFRelease( pAttrDict );

	// TODO? also use the HEAD table if available to get more attributes
//	CFDataRef CTFontCopyTable( CTFontRef, kCTFontTableHead, /*kCTFontTableOptionNoOptions*/kCTFontTableOptionExcludeSynthetic );

#if (OSL_DEBUG_LEVEL >= 1)
	// update font attributes using the font's postscript name
	ImplDevFontAttributes rDFA2;
	CTFontRef pFont = CTFontCreateWithFontDescriptor( pFD, 0.0, NULL );
	CFStringRef pPSName = CTFontCopyPostScriptName( pFont );
	const String aPSName = GetOUString( pPSName );

	rDFA2.mbSymbolFlag = false;
	rDFA2.mePitch      = PITCH_VARIABLE;
	rDFA2.meWidthType  = WIDTH_NORMAL;
	rDFA2.meWeight     = WEIGHT_NORMAL;
	rDFA2.meItalic     = ITALIC_NONE;

	UpdateAttributesFromPSName( aPSName, rDFA2 );
	CFRelease( pPSName );
	CFRelease( pFont );

	// show the font details and compare the CTFontDescriptor vs. PSName traits
	char cMatch = (rDFA.mbSymbolFlag==rDFA2.mbSymbolFlag);
	cMatch &= (rDFA.meWeight==rDFA2.meWeight);
	cMatch &= ((rDFA.meItalic==ITALIC_NONE) == (rDFA2.meItalic==ITALIC_NONE));
	cMatch &= (rDFA.meWidthType==rDFA2.meWidthType);
	cMatch = cMatch ? '.' : '#';

	char aFN[256], aSN[256];
	CFStringGetCString( pFamilyName, aFN, sizeof(aFN), kCFStringEncodingUTF8 );
	CFStringGetCString( pStyleName, aSN, sizeof(aSN), kCFStringEncodingUTF8 );

	const ByteString aPSCName( aPSName, RTL_TEXTENCODING_UTF8 );
	const char* aPN = aPSCName.GetBuffer();
	printf("\tCTFont_%d%x%d%d_%c_%d%x%d%d ena=%d s=%02d b=%+.2f i=%+.2f w=%+.2f (\"%s\", \"%s\", \"%s\")\n",
		(int)rDFA.mbSymbolFlag,(int)rDFA.meWeight,(int)rDFA.meItalic,(int)rDFA.meWidthType,
		cMatch,
		(int)rDFA2.mbSymbolFlag,(int)rDFA2.meWeight,(int)rDFA2.meItalic,(int)rDFA2.meWidthType,
		bFontEnabled,
		(int)(nSymbolTrait>>kCTFontClassMaskShift),fWeight,fSlant,fWidth,aFN,aSN,aPN);
#endif // (OSL_DEBUG_LEVEL >= 1)

	if( bFontEnabled)
	{
		const sal_IntPtr nFontId = (sal_IntPtr)pValue;
		CTFontData* pFontData = new CTFontData( rDFA, nFontId );
		CTFontList* pFontList = (CTFontList*)pContext;
		pFontList->AddFont( pFontData );
	}
}

// =======================================================================

CTFontList::CTFontList()
:	mpCTFontCollection( NULL )
,	mpCTFontArray( NULL )
{}

// -----------------------------------------------------------------------

CTFontList::~CTFontList()
{
	CTFontContainer::const_iterator it = maFontContainer.begin();
	for(; it != maFontContainer.end(); ++it )
		delete (*it).second;
	maFontContainer.clear();

	if( mpCTFontArray )
		CFRelease( mpCTFontArray );
	if( mpCTFontCollection )
		CFRelease( mpCTFontCollection );
}

// -----------------------------------------------------------------------

void CTFontList::AddFont( CTFontData* pFontData )
{
	sal_IntPtr nFontId = pFontData->GetFontId();
	maFontContainer[ nFontId ] = pFontData;
}

// -----------------------------------------------------------------------

void CTFontList::AnnounceFonts( ImplDevFontList& rFontList ) const
{
	CTFontContainer::const_iterator it = maFontContainer.begin();
	for(; it != maFontContainer.end(); ++it )
		rFontList.Add( (*it).second->Clone() );
}

// -----------------------------------------------------------------------

ImplMacFontData* CTFontList::GetFontDataFromId( sal_IntPtr nFontId ) const
{
	CTFontContainer::const_iterator it = maFontContainer.find( nFontId );
	if( it == maFontContainer.end() )
		return NULL;
	return (*it).second;
}

// -----------------------------------------------------------------------

bool CTFontList::Init( void )
{
#ifndef DISABLE_CORETEXT_DYNLOAD
	// check availability of the CoreText API
	const DynCoreTextSyms& rCT = DynCoreTextSyms::get();
	if( !rCT.IsActive() )
		return false;
#endif // DISABLE_CORETEXT_DYNLOAD

	// enumerate available system fonts
	static const int nMaxDictEntries = 8;
	CFMutableDictionaryRef pCFDict = CFDictionaryCreateMutable( NULL,
		nMaxDictEntries, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks );
	CFDictionaryAddValue( pCFDict, kCTFontCollectionRemoveDuplicatesOption, kCFBooleanTrue );
	mpCTFontCollection = rCT.FontCollectionCreateFromAvailableFonts( pCFDict );
	CFRelease( pCFDict );

	mpCTFontArray = rCT.FontCollectionCreateMatchingFontDescriptors( mpCTFontCollection );
	const int nFontCount = CFArrayGetCount( mpCTFontArray );
	const CFRange aFullRange = CFRangeMake( 0, nFontCount );
	CFArrayApplyFunction( mpCTFontArray, aFullRange, CTFontEnumCallBack, this );

	return true;
}

// =======================================================================

#ifndef DISABLE_CORETEXT_DYNLOAD

DynCoreTextSyms::DynCoreTextSyms( void )
{
	mbIsActive = false;

	// check if CoreText has been explicitely disabled
	const char* pEnvStr = getenv( "SAL_DISABLE_CORETEXT");
	if( pEnvStr && (pEnvStr[0] != '0') )
		return;

	// check CoreText version
	GetCoreTextVersion = (uint32_t(*)(void))dlsym( RTLD_DEFAULT, "CTGetCoreTextVersion");
	if( !GetCoreTextVersion) return;

	const uint32_t nCTVersion = GetCoreTextVersion();
	static const uint32_t mykCTVersionNumber10_5 = 0x00020000;
	if( nCTVersion < mykCTVersionNumber10_5)
		return;

	// load CoreText symbols dynamically
	LineGetTrailingWhitespaceWidth = (double(*)(CTLineRef))dlsym( RTLD_DEFAULT, "CTLineGetTrailingWhitespaceWidth");
	if( !LineGetTrailingWhitespaceWidth) return;

	LineCreateJustifiedLine = (CTLineRef(*)(CTLineRef,CGFloat,double))dlsym( RTLD_DEFAULT, "CTLineCreateJustifiedLine");
	if( !LineCreateJustifiedLine) return;

	LineGetOffsetForStringIndex = (CGFloat(*)(CTLineRef,CFIndex,CGFloat*))dlsym( RTLD_DEFAULT, "CTLineGetOffsetForStringIndex");
	if( !LineGetOffsetForStringIndex) return;

	LineGetGlyphRuns = (CFArrayRef(*)(CTLineRef))dlsym( RTLD_DEFAULT, "CTLineGetGlyphRuns");
	if( !LineGetGlyphRuns) return;

	RunGetGlyphCount = (CFIndex(*)(CTRunRef))dlsym( RTLD_DEFAULT, "CTRunGetGlyphCount");
	if( !RunGetGlyphCount) return;

	RunGetGlyphsPtr = (const CGGlyph*(*)(CTRunRef))dlsym( RTLD_DEFAULT, "CTRunGetGlyphsPtr");
	if( !RunGetGlyphsPtr) return;

	RunGetPositionsPtr = (const CGPoint*(*)(CTRunRef))dlsym( RTLD_DEFAULT, "CTRunGetPositionsPtr");
	if( !RunGetPositionsPtr) return;

	RunGetAdvancesPtr = (const CGSize*(*)(CTRunRef))dlsym( RTLD_DEFAULT, "CTRunGetAdvancesPtr");
	if( !RunGetAdvancesPtr) return;

	RunGetStringIndicesPtr = (const CFIndex*(*)(CTRunRef))dlsym( RTLD_DEFAULT, "CTRunGetStringIndicesPtr");
	if( !RunGetStringIndicesPtr) return;

	FontCollectionCreateFromAvailableFonts = (CTFontCollectionRef(*)(CFDictionaryRef))dlsym( RTLD_DEFAULT, "CTFontCollectionCreateFromAvailableFonts");
	if( !FontCollectionCreateFromAvailableFonts) return;

	FontCollectionCreateMatchingFontDescriptors = (CFArrayRef(*)(CTFontCollectionRef))dlsym( RTLD_DEFAULT, "CTFontCollectionCreateMatchingFontDescriptors");
	if( !FontCollectionCreateMatchingFontDescriptors) return;

	FontCreatePathForGlyph = (CGPathRef(*)(CTFontRef,CGGlyph,const CGAffineTransform*))dlsym( RTLD_DEFAULT, "CTFontCreatePathForGlyph");
	if( !FontCreatePathForGlyph) return;

	FontGetBoundingRectsForGlyphs = (CGRect(*)(CTFontRef,CTFontOrientation,CGGlyph*,CGRect*,CFIndex))dlsym( RTLD_DEFAULT, "CTFontGetBoundingRectsForGlyphs");
	if( !FontGetBoundingRectsForGlyphs) return;

	mbIsActive = true;
}

// -----------------------------------------------------------------------

const DynCoreTextSyms& DynCoreTextSyms::get( void )
{
	static DynCoreTextSyms aCT;
	return aCT;
}

#endif // DISABLE_CORETEXT_DYNLOAD

// =======================================================================

SystemFontList* GetCoretextFontList( void )
{
	CTFontList* pList = new CTFontList();
	if( !pList->Init() ) {
		delete pList;
		return NULL;
	}

	return pList;
}

// =======================================================================