/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   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 .
 */

#include "sal/config.h"

#include <cstring>

#include <sal/types.h>
#include <osl/endian.h>
#include <osl/file.hxx>

#include <basegfx/polygon/b2dpolygon.hxx>

#include "quartz/salbmp.h"
#include "quartz/salgdi.h"

#include "fontsubset.hxx"
#include "sft.hxx"

#ifdef IOS
#include "saldatabasic.hxx"
#endif

using namespace vcl;

typedef std::vector<unsigned char> ByteVector;

static const basegfx::B2DPoint aHalfPointOfs ( 0.5, 0.5 );

static void AddPolygonToPath( CGMutablePathRef xPath,
                              const ::basegfx::B2DPolygon& rPolygon,
                              bool bClosePath, bool bPixelSnap, bool bLineDraw )
{
    // short circuit if there is nothing to do
    const int nPointCount = rPolygon.count();
    if( nPointCount <= 0 )
    {
        return;
    }
    (void)bPixelSnap; // TODO
    const CGAffineTransform* pTransform = NULL;

    const bool bHasCurves = rPolygon.areControlPointsUsed();
    for( int nPointIdx = 0, nPrevIdx = 0;; nPrevIdx = nPointIdx++ )
    {
        int nClosedIdx = nPointIdx;
        if( nPointIdx >= nPointCount )
        {
            // prepare to close last curve segment if needed
            if( bClosePath && (nPointIdx == nPointCount) )
            {
                nClosedIdx = 0;
            }
            else
            {
                break;
            }
        }

        ::basegfx::B2DPoint aPoint = rPolygon.getB2DPoint( nClosedIdx );

        if( bPixelSnap)
        {
            // snap device coordinates to full pixels
            aPoint.setX( basegfx::fround( aPoint.getX() ) );
            aPoint.setY( basegfx::fround( aPoint.getY() ) );
        }

        if( bLineDraw )
        {
            aPoint += aHalfPointOfs;
        }
        if( !nPointIdx )
        {
            // first point => just move there
            CGPathMoveToPoint( xPath, pTransform, aPoint.getX(), aPoint.getY() );
            continue;
        }

        bool bPendingCurve = false;
        if( bHasCurves )
        {
            bPendingCurve = rPolygon.isNextControlPointUsed( nPrevIdx );
            bPendingCurve |= rPolygon.isPrevControlPointUsed( nClosedIdx );
        }

        if( !bPendingCurve )    // line segment
        {
            CGPathAddLineToPoint( xPath, pTransform, aPoint.getX(), aPoint.getY() );
        }
        else                        // cubic bezier segment
        {
            basegfx::B2DPoint aCP1 = rPolygon.getNextControlPoint( nPrevIdx );
            basegfx::B2DPoint aCP2 = rPolygon.getPrevControlPoint( nClosedIdx );
            if( bLineDraw )
            {
                aCP1 += aHalfPointOfs;
                aCP2 += aHalfPointOfs;
            }
            CGPathAddCurveToPoint( xPath, pTransform, aCP1.getX(), aCP1.getY(),
                                   aCP2.getX(), aCP2.getY(), aPoint.getX(), aPoint.getY() );
        }
    }

    if( bClosePath )
    {
        CGPathCloseSubpath( xPath );
    }
}

static void AddPolyPolygonToPath( CGMutablePathRef xPath,
                                  const ::basegfx::B2DPolyPolygon& rPolyPoly,
                                  bool bPixelSnap, bool bLineDraw )
{
    // short circuit if there is nothing to do
    const int nPolyCount = rPolyPoly.count();
    if( nPolyCount <= 0 )
    {
        return;
    }
    for( int nPolyIdx = 0; nPolyIdx < nPolyCount; ++nPolyIdx )
    {
        const ::basegfx::B2DPolygon rPolygon = rPolyPoly.getB2DPolygon( nPolyIdx );
        AddPolygonToPath( xPath, rPolygon, true, bPixelSnap, bLineDraw );
    }
}

sal_Bool AquaSalGraphics::CreateFontSubset( const OUString& rToFile,
                                            const PhysicalFontFace* pFontData,
                                            sal_Int32* pGlyphIDs, sal_uInt8* pEncoding,
                                            sal_Int32* pGlyphWidths, int nGlyphCount,
                                            FontSubsetInfo& rInfo )
{
    // TODO: move more of the functionality here into the generic subsetter code

    // prepare the requested file name for writing the font-subset file
    OUString aSysPath;
    if( osl_File_E_None != osl_getSystemPathFromFileURL( rToFile.pData, &aSysPath.pData ) )
        return sal_False;
    const rtl_TextEncoding aThreadEncoding = osl_getThreadTextEncoding();
    const OString aToFile( OUStringToOString( aSysPath, aThreadEncoding ) );

    // get the raw-bytes from the font to be subset
    ByteVector aBuffer;
    bool bCffOnly = false;
    if( !GetRawFontData( pFontData, aBuffer, &bCffOnly ) )
        return sal_False;

    // handle CFF-subsetting
    if( bCffOnly )
    {
        // provide the raw-CFF data to the subsetter
        ByteCount nCffLen = aBuffer.size();
        rInfo.LoadFont( FontSubsetInfo::CFF_FONT, &aBuffer[0], nCffLen );

        // NOTE: assuming that all glyphids requested on Aqua are fully translated

        // make the subsetter provide the requested subset
        FILE* pOutFile = fopen( aToFile.getStr(), "wb" );
#ifdef __LP64__
        long *pLongGlyphIDs = (long*)alloca(nGlyphCount * sizeof(long));
        for (int i = 0; i < nGlyphCount; i++)
            pLongGlyphIDs[i] = pGlyphIDs[i];
        bool bRC = rInfo.CreateFontSubset( FontSubsetInfo::TYPE1_PFB, pOutFile, NULL,
            pLongGlyphIDs, pEncoding, nGlyphCount, pGlyphWidths );
#else
        bool bRC = rInfo.CreateFontSubset( FontSubsetInfo::TYPE1_PFB, pOutFile, NULL,
            pGlyphIDs, pEncoding, nGlyphCount, pGlyphWidths );
#endif
        fclose( pOutFile );
        return bRC;
    }

    // TODO: modernize psprint's horrible fontsubset C-API
    // this probably only makes sense after the switch to another SCM
    // that can preserve change history after file renames

    // prepare data for psprint's font subsetter
    TrueTypeFont* pSftFont = NULL;
    int nRC = ::OpenTTFontBuffer( (void*)&aBuffer[0], aBuffer.size(), 0, &pSftFont);
    if( nRC != SF_OK )
        return sal_False;

    // get details about the subsetted font
    TTGlobalFontInfo aTTInfo;
    ::GetTTGlobalFontInfo( pSftFont, &aTTInfo );
    rInfo.m_nFontType   = FontSubsetInfo::SFNT_TTF;
    rInfo.m_aPSName     = OUString(
        aTTInfo.psname, std::strlen(aTTInfo.psname), RTL_TEXTENCODING_UTF8 );
    rInfo.m_aFontBBox   = Rectangle( Point( aTTInfo.xMin, aTTInfo.yMin ),
                                    Point( aTTInfo.xMax, aTTInfo.yMax ) );
    rInfo.m_nCapHeight  = aTTInfo.yMax; // Well ...
    rInfo.m_nAscent     = aTTInfo.winAscent;
    rInfo.m_nDescent    = aTTInfo.winDescent;
    // mac fonts usually do not have an OS2-table
    // => get valid ascent/descent values from other tables
    if( !rInfo.m_nAscent )
        rInfo.m_nAscent = +aTTInfo.typoAscender;
    if( !rInfo.m_nAscent )
        rInfo.m_nAscent = +aTTInfo.ascender;
    if( !rInfo.m_nDescent )
        rInfo.m_nDescent = +aTTInfo.typoDescender;
    if( !rInfo.m_nDescent )
        rInfo.m_nDescent = -aTTInfo.descender;

    // subset glyphs and get their properties
    // take care that subset fonts require the NotDef glyph in pos 0
    int nOrigCount = nGlyphCount;
    sal_uInt16    aShortIDs[ 256 ];
    sal_uInt8 aTempEncs[ 256 ];

    int nNotDef = -1;
    for( int i = 0; i < nGlyphCount; ++i )
    {
        aTempEncs[i] = pEncoding[i];
        sal_uInt32 nGlyphIdx = pGlyphIDs[i] & GF_IDXMASK;
        if( pGlyphIDs[i] & GF_ISCHAR )
        {
            bool bVertical = (pGlyphIDs[i] & GF_ROTMASK) != 0;
            nGlyphIdx = ::MapChar( pSftFont, static_cast<sal_uInt16>(nGlyphIdx), bVertical );
            if( nGlyphIdx == 0 && pFontData->IsSymbolFont() )
            {
                // #i12824# emulate symbol aliasing U+FXXX <-> U+0XXX
                nGlyphIdx = pGlyphIDs[i] & GF_IDXMASK;
                nGlyphIdx = (nGlyphIdx & 0xF000) ? (nGlyphIdx & 0x00FF) : (nGlyphIdx | 0xF000 );
                nGlyphIdx = ::MapChar( pSftFont, static_cast<sal_uInt16>(nGlyphIdx), bVertical );
            }
        }
        aShortIDs[i] = static_cast<sal_uInt16>( nGlyphIdx );
        if( !nGlyphIdx )
            if( nNotDef < 0 )
                nNotDef = i; // first NotDef glyph found
    }

    if( nNotDef != 0 )
    {
        // add fake NotDef glyph if needed
        if( nNotDef < 0 )
            nNotDef = nGlyphCount++;

        // NotDef glyph must be in pos 0 => swap glyphids
        aShortIDs[ nNotDef ] = aShortIDs[0];
        aTempEncs[ nNotDef ] = aTempEncs[0];
        aShortIDs[0] = 0;
        aTempEncs[0] = 0;
    }
    DBG_ASSERT( nGlyphCount < 257, "too many glyphs for subsetting" );

    // TODO: where to get bVertical?
    const bool bVertical = false;

    // fill the pGlyphWidths array
    // while making sure that the NotDef glyph is at index==0
    TTSimpleGlyphMetrics* pGlyphMetrics =
        ::GetTTSimpleGlyphMetrics( pSftFont, aShortIDs, nGlyphCount, bVertical );
    if( !pGlyphMetrics )
        return sal_False;
    sal_uInt16 nNotDefAdv       = pGlyphMetrics[0].adv;
    pGlyphMetrics[0].adv        = pGlyphMetrics[nNotDef].adv;
    pGlyphMetrics[nNotDef].adv  = nNotDefAdv;
    for( int i = 0; i < nOrigCount; ++i )
        pGlyphWidths[i] = pGlyphMetrics[i].adv;
    free( pGlyphMetrics );

    // write subset into destination file
    nRC = ::CreateTTFromTTGlyphs( pSftFont, aToFile.getStr(), aShortIDs,
            aTempEncs, nGlyphCount, 0, NULL, 0 );
    ::CloseTTFont(pSftFont);
    return (nRC == SF_OK);
}

static inline void alignLinePoint( const SalPoint* i_pIn, float& o_fX, float& o_fY )
{
    o_fX = static_cast<float>(i_pIn->mnX ) + 0.5;
    o_fY = static_cast<float>(i_pIn->mnY ) + 0.5;
}

void AquaSalGraphics::copyBits( const SalTwoRect& rPosAry, SalGraphics *pSrcGraphics )
{
#ifdef IOS
    // Horrible horrible this is all crack, mxLayer is always NULL on iOS,
    // all this stuff should be rewritten anyway for iOS
    if( !mxLayer )
        return;
#endif

    if( !pSrcGraphics )
    {
        pSrcGraphics = this;
    }
    //from unix salgdi2.cxx
    //[FIXME] find a better way to prevent calc from crashing when width and height are negative
    if( rPosAry.mnSrcWidth <= 0
        || rPosAry.mnSrcHeight <= 0
        || rPosAry.mnDestWidth <= 0
        || rPosAry.mnDestHeight <= 0 )
    {
        return;
    }

    // accelerate trivial operations
    /*const*/ AquaSalGraphics* pSrc = static_cast<AquaSalGraphics*>(pSrcGraphics);
    const bool bSameGraphics = (this == pSrc)
#ifdef MACOSX
        || (mbWindow && mpFrame && pSrc->mbWindow && (mpFrame == pSrc->mpFrame))
#endif
        ;
    if( bSameGraphics
    &&  (rPosAry.mnSrcWidth == rPosAry.mnDestWidth)
    &&  (rPosAry.mnSrcHeight == rPosAry.mnDestHeight))
    {
        // short circuit if there is nothing to do
        if( (rPosAry.mnSrcX == rPosAry.mnDestX)
        &&  (rPosAry.mnSrcY == rPosAry.mnDestY))
            return;
        // use copyArea() if source and destination context are identical
        copyArea( rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnSrcX, rPosAry.mnSrcY,
            rPosAry.mnSrcWidth, rPosAry.mnSrcHeight, 0 );
        return;
    }

    ApplyXorContext();
    pSrc->ApplyXorContext();

    DBG_ASSERT( pSrc->mxLayer!=NULL, "AquaSalGraphics::copyBits() from non-layered graphics" );

    const CGPoint aDstPoint = CGPointMake(+rPosAry.mnDestX - rPosAry.mnSrcX, rPosAry.mnDestY - rPosAry.mnSrcY);
    if( (rPosAry.mnSrcWidth == rPosAry.mnDestWidth &&
         rPosAry.mnSrcHeight == rPosAry.mnDestHeight) &&
        (!mnBitmapDepth || (aDstPoint.x + pSrc->mnWidth) <= mnWidth) ) // workaround a Quartz crasher
    {
#ifdef IOS
        if( !CheckContext() )
            return;
#endif
        // in XOR mode the drawing context is redirected to the XOR mask
        // if source and target are identical then copyBits() paints onto the target context though
        CGContextRef xCopyContext = mrContext;
        if( mpXorEmulation && mpXorEmulation->IsEnabled() )
        {
            if( pSrcGraphics == this )
            {
                xCopyContext = mpXorEmulation->GetTargetContext();
            }
        }
        CGContextSaveGState( xCopyContext );
        const CGRect aDstRect = CGRectMake(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, rPosAry.mnDestHeight);
        CGContextClipToRect( xCopyContext, aDstRect );

        // draw at new destination
        // NOTE: flipped drawing gets disabled for this, else the subimage would be drawn upside down
        if( pSrc->IsFlipped() )
        {
            CGContextTranslateCTM( xCopyContext, 0, +mnHeight ); CGContextScaleCTM( xCopyContext, +1, -1 );
        }
        // TODO: pSrc->size() != this->size()
        CGContextDrawLayerAtPoint( xCopyContext, aDstPoint, pSrc->mxLayer );
        CGContextRestoreGState( xCopyContext );
        // mark the destination rectangle as updated
        RefreshRect( aDstRect );
    }
    else
    {
        SalBitmap* pBitmap = pSrc->getBitmap( rPosAry.mnSrcX, rPosAry.mnSrcY,
                                              rPosAry.mnSrcWidth, rPosAry.mnSrcHeight );

        if( pBitmap )
        {
            SalTwoRect aPosAry( rPosAry );
            aPosAry.mnSrcX = 0;
            aPosAry.mnSrcY = 0;
            drawBitmap( aPosAry, *pBitmap );
            delete pBitmap;
        }
    }
}

static void DrawPattern50( void*, CGContextRef rContext )
{
    static const CGRect aRects[2] = { { {0,0}, { 2, 2 } }, { { 2, 2 }, { 2, 2 } } };
    CGContextAddRects( rContext, aRects, 2 );
    CGContextFillPath( rContext );
}

static void getBoundRect( sal_uLong nPoints, const SalPoint *pPtAry, long &rX, long& rY, long& rWidth, long& rHeight )
{
    long nX1 = pPtAry->mnX;
    long nX2 = nX1;
    long nY1 = pPtAry->mnY;
    long nY2 = nY1;
    for( sal_uLong n = 1; n < nPoints; n++ )
    {
        if( pPtAry[n].mnX < nX1 )
        {
            nX1 = pPtAry[n].mnX;
        }
        else if( pPtAry[n].mnX > nX2 )
        {
            nX2 = pPtAry[n].mnX;
        }
        if( pPtAry[n].mnY < nY1 )
        {
            nY1 = pPtAry[n].mnY;
        }
        else if( pPtAry[n].mnY > nY2 )
        {
            nY2 = pPtAry[n].mnY;
        }
    }
    rX = nX1;
    rY = nY1;
    rWidth = nX2 - nX1 + 1;
    rHeight = nY2 - nY1 + 1;
}

static SalColor ImplGetROPSalColor( SalROPColor nROPColor )
{
    SalColor nSalColor;
    if ( nROPColor == SAL_ROP_0 )
    {
        nSalColor = MAKE_SALCOLOR( 0, 0, 0 );
    }
    else
    {
        nSalColor = MAKE_SALCOLOR( 255, 255, 255 );
    }
    return nSalColor;
}

// apply the XOR mask to the target context if active and dirty
void AquaSalGraphics::ApplyXorContext()
{
    if( !mpXorEmulation )
    {
        return;
    }
    if( mpXorEmulation->UpdateTarget() )
    {
        RefreshRect( 0, 0, mnWidth, mnHeight ); // TODO: refresh minimal changerect
    }
}

void AquaSalGraphics::copyArea( long nDstX, long nDstY,long nSrcX, long nSrcY,
                                long nSrcWidth, long nSrcHeight, sal_uInt16 /*nFlags*/ )
{
#ifdef IOS
    if( !mxLayer )
        return;
#endif

    ApplyXorContext();

    DBG_ASSERT( mxLayer!=NULL, "AquaSalGraphics::copyArea() for non-layered graphics" );

    // in XOR mode the drawing context is redirected to the XOR mask
    // copyArea() always works on the target context though
    CGContextRef xCopyContext = mrContext;
    if( mpXorEmulation && mpXorEmulation->IsEnabled() )
    {
        xCopyContext = mpXorEmulation->GetTargetContext();
    }
    // drawing a layer onto its own context causes trouble on OSX => copy it first
    // TODO: is it possible to get rid of this unneeded copy more often?
    //       e.g. on OSX>=10.5 only this situation causes problems:
    //          mnBitmapDepth && (aDstPoint.x + pSrc->mnWidth) > mnWidth
    CGLayerRef xSrcLayer = mxLayer;
    // TODO: if( mnBitmapDepth > 0 )
    {
        const CGSize aSrcSize = CGSizeMake(nSrcWidth, nSrcHeight);
        xSrcLayer = CGLayerCreateWithContext( xCopyContext, aSrcSize, NULL );
        const CGContextRef xSrcContext = CGLayerGetContext( xSrcLayer );
        CGPoint aSrcPoint = CGPointMake(-nSrcX, -nSrcY);
        if( IsFlipped() )
        {
            CGContextTranslateCTM( xSrcContext, 0, +nSrcHeight );
            CGContextScaleCTM( xSrcContext, +1, -1 );
            aSrcPoint.y = (nSrcY + nSrcHeight) - mnHeight;
        }
        CGContextDrawLayerAtPoint( xSrcContext, aSrcPoint, mxLayer );
    }

    // draw at new destination
    const CGPoint aDstPoint = CGPointMake(+nDstX, +nDstY);
    CGContextDrawLayerAtPoint( xCopyContext, aDstPoint, xSrcLayer );

    // cleanup
    if( xSrcLayer != mxLayer )
    {
        CGLayerRelease( xSrcLayer );
    }
    // mark the destination rectangle as updated
    RefreshRect( nDstX, nDstY, nSrcWidth, nSrcHeight );

}

#ifndef IOS

void AquaSalGraphics::copyResolution( AquaSalGraphics& rGraphics )
{
    if( !rGraphics.mnRealDPIY && rGraphics.mbWindow && rGraphics.mpFrame )
    {
        rGraphics.initResolution( rGraphics.mpFrame->getNSWindow() );
    }
    mnRealDPIX = rGraphics.mnRealDPIX;
    mnRealDPIY = rGraphics.mnRealDPIY;
}

#endif

bool AquaSalGraphics::drawAlphaBitmap( const SalTwoRect& rTR,
                                       const SalBitmap& rSrcBitmap,
                                       const SalBitmap& rAlphaBmp )
{
    // An image mask can't have a depth > 8 bits (should be 1 to 8 bits)
    if( rAlphaBmp.GetBitCount() > 8 )
    {
        return false;
    }
    // are these two tests really necessary? (see vcl/unx/source/gdi/salgdi2.cxx)
    // horizontal/vertical mirroring not implemented yet
    if( rTR.mnDestWidth < 0 || rTR.mnDestHeight < 0 )
    {
        return false;
    }

    const QuartzSalBitmap& rSrcSalBmp = static_cast<const QuartzSalBitmap&>(rSrcBitmap);
    const QuartzSalBitmap& rMaskSalBmp = static_cast<const QuartzSalBitmap&>(rAlphaBmp);
    CGImageRef xMaskedImage = rSrcSalBmp.CreateWithMask( rMaskSalBmp, rTR.mnSrcX,
                                                         rTR.mnSrcY, rTR.mnSrcWidth,
                                                         rTR.mnSrcHeight );
    if( !xMaskedImage )
    {
        return false;
    }
    if ( CheckContext() )
    {
        const CGRect aDstRect = CGRectMake( rTR.mnDestX, rTR.mnDestY, rTR.mnDestWidth, rTR.mnDestHeight);
        CGContextDrawImage( mrContext, aDstRect, xMaskedImage );
        RefreshRect( aDstRect );
    }

    CGImageRelease(xMaskedImage);
    return true;
}

bool AquaSalGraphics::drawTransformedBitmap(
    const basegfx::B2DPoint& rNull, const basegfx::B2DPoint& rX, const basegfx::B2DPoint& rY,
    const SalBitmap& rSrcBitmap, const SalBitmap* pAlphaBmp )
{
    if( !CheckContext() )
        return true;

    // get the Quartz image
    CGImageRef xImage = NULL;
    const Size aSize = rSrcBitmap.GetSize();
    const QuartzSalBitmap& rSrcSalBmp = static_cast<const QuartzSalBitmap&>(rSrcBitmap);
    const QuartzSalBitmap* pMaskSalBmp = static_cast<const QuartzSalBitmap*>(pAlphaBmp);
    if( !pMaskSalBmp)
        xImage = rSrcSalBmp.CreateCroppedImage( 0, 0, (int)aSize.Width(), (int)aSize.Height() );
    else
        xImage = rSrcSalBmp.CreateWithMask( *pMaskSalBmp, 0, 0, (int)aSize.Width(), (int)aSize.Height() );
    if( !xImage )
        return false;

    // setup the image transformation
    // using the rNull,rX,rY points as destinations for the (0,0),(0,Width),(Height,0) source points
    CGContextSaveGState( mrContext );
    const basegfx::B2DVector aXRel = rX - rNull;
    const basegfx::B2DVector aYRel = rY - rNull;
    const CGAffineTransform aCGMat = CGAffineTransformMake(
        aXRel.getX()/aSize.Width(), aXRel.getY()/aSize.Width(),
        aYRel.getX()/aSize.Height(), aYRel.getY()/aSize.Height(),
        rNull.getX(), rNull.getY());
    CGContextConcatCTM( mrContext, aCGMat );

    // draw the transformed image
    const CGRect aSrcRect = CGRectMake(0, 0, aSize.Width(), aSize.Height());
    CGContextDrawImage( mrContext, aSrcRect, xImage );
    CGImageRelease( xImage );
    // restore the Quartz graphics state
    CGContextRestoreGState(mrContext);

    // mark the destination as painted
    const CGRect aDstRect = CGRectApplyAffineTransform( aSrcRect, aCGMat );
    RefreshRect( aDstRect );
    return true;
}


bool AquaSalGraphics::drawAlphaRect( long nX, long nY, long nWidth,
                                     long nHeight, sal_uInt8 nTransparency )
{
    if( !CheckContext() )
    {
        return true;
    }
    // save the current state
    CGContextSaveGState( mrContext );
    CGContextSetAlpha( mrContext, (100-nTransparency) * (1.0/100) );

    CGRect aRect = CGRectMake(nX, nY, nWidth-1, nHeight-1);
    if( IsPenVisible() )
    {
        aRect.origin.x += 0.5;
        aRect.origin.y += 0.5;
    }

    CGContextBeginPath( mrContext );
    CGContextAddRect( mrContext, aRect );
    CGContextDrawPath( mrContext, kCGPathFill );

    // restore state
    CGContextRestoreGState(mrContext);
    RefreshRect( aRect );
    return true;
}

void AquaSalGraphics::drawBitmap( const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap )
{
    if( !CheckContext() )
    {
        return;
    }
    const QuartzSalBitmap& rBitmap = static_cast<const QuartzSalBitmap&>(rSalBitmap);
    CGImageRef xImage = rBitmap.CreateCroppedImage( (int)rPosAry.mnSrcX, (int)rPosAry.mnSrcY,
                                                    (int)rPosAry.mnSrcWidth, (int)rPosAry.mnSrcHeight );
    if( !xImage )
    {
        return;
    }

    const CGRect aDstRect = CGRectMake(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, rPosAry.mnDestHeight);
    CGContextDrawImage( mrContext, aDstRect, xImage );
    CGImageRelease( xImage );
    RefreshRect( aDstRect );
}

void AquaSalGraphics::drawBitmap( const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap,SalColor )
{
    OSL_FAIL("not implemented for color masking!");
    drawBitmap( rPosAry, rSalBitmap );
}

void AquaSalGraphics::drawBitmap( const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap,
                                  const SalBitmap& rTransparentBitmap )
{
    if( !CheckContext() )
    {
        return;
    }
    const QuartzSalBitmap& rBitmap = static_cast<const QuartzSalBitmap&>(rSalBitmap);
    const QuartzSalBitmap& rMask = static_cast<const QuartzSalBitmap&>(rTransparentBitmap);
    CGImageRef xMaskedImage( rBitmap.CreateWithMask( rMask, rPosAry.mnSrcX, rPosAry.mnSrcY,
                                                     rPosAry.mnSrcWidth, rPosAry.mnSrcHeight ) );
    if( !xMaskedImage )
    {
        return;
    }

    const CGRect aDstRect = CGRectMake(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, rPosAry.mnDestHeight);
    CGContextDrawImage( mrContext, aDstRect, xMaskedImage );
    CGImageRelease( xMaskedImage );
    RefreshRect( aDstRect );
}

#ifndef IOS

sal_Bool AquaSalGraphics::drawEPS( long nX, long nY, long nWidth, long nHeight,
                                   void* pEpsData, sal_uLong nByteCount )
{
    // convert the raw data to an NSImageRef
    NSData* xNSData = [NSData dataWithBytes:(void*)pEpsData length:(int)nByteCount];
    NSImageRep* xEpsImage = [NSEPSImageRep imageRepWithData: xNSData];
    if( !xEpsImage )
    {
        return false;
    }
    // get the target context
    if( !CheckContext() )
    {
        return false;
    }
    // NOTE: flip drawing, else the nsimage would be drawn upside down
    CGContextSaveGState( mrContext );
//  CGContextTranslateCTM( mrContext, 0, +mnHeight );
    CGContextScaleCTM( mrContext, +1, -1 );
    nY = /*mnHeight*/ - (nY + nHeight);

    // prepare the target context
    NSGraphicsContext* pOrigNSCtx = [NSGraphicsContext currentContext];
    [pOrigNSCtx retain];

    // create new context
    NSGraphicsContext* pDrawNSCtx = [NSGraphicsContext graphicsContextWithGraphicsPort: mrContext flipped: IsFlipped()];
    // set it, setCurrentContext also releases the prviously set one
    [NSGraphicsContext setCurrentContext: pDrawNSCtx];

    // draw the EPS
    const NSRect aDstRect = NSMakeRect( nX, nY, nWidth, nHeight);
    const BOOL bOK = [xEpsImage drawInRect: aDstRect];

    // restore the NSGraphicsContext
    [NSGraphicsContext setCurrentContext: pOrigNSCtx];
    [pOrigNSCtx release]; // restore the original retain count

    CGContextRestoreGState( mrContext );
    // mark the destination rectangle as updated
    RefreshRect( aDstRect );

    return bOK;
}

#endif

void AquaSalGraphics::drawLine( long nX1, long nY1, long nX2, long nY2 )
{
    if( nX1 == nX2 && nY1 == nY2 )
    {
        // #i109453# platform independent code expects at least one pixel to be drawn
        drawPixel( nX1, nY1 );
        return;
    }

    if( !CheckContext() )
    {
        return;
    }
    CGContextBeginPath( mrContext );
    CGContextMoveToPoint( mrContext, static_cast<float>(nX1)+0.5, static_cast<float>(nY1)+0.5 );
    CGContextAddLineToPoint( mrContext, static_cast<float>(nX2)+0.5, static_cast<float>(nY2)+0.5 );
    CGContextDrawPath( mrContext, kCGPathStroke );

    Rectangle aRefreshRect( nX1, nY1, nX2, nY2 );
    (void) aRefreshRect;
    // Is a call to RefreshRect( aRefreshRect ) missing here?
}

void AquaSalGraphics::drawMask( const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap, SalColor nMaskColor )
{
    if( !CheckContext() )
    {
        return;
    }
    const QuartzSalBitmap& rBitmap = static_cast<const QuartzSalBitmap&>(rSalBitmap);
    CGImageRef xImage = rBitmap.CreateColorMask( rPosAry.mnSrcX, rPosAry.mnSrcY,
                                                 rPosAry.mnSrcWidth, rPosAry.mnSrcHeight,
                                                 nMaskColor );
    if( !xImage )
    {
        return;
    }

    const CGRect aDstRect = CGRectMake(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, rPosAry.mnDestHeight);
    CGContextDrawImage( mrContext, aDstRect, xImage );
    CGImageRelease( xImage );
    RefreshRect( aDstRect );
}

void AquaSalGraphics::drawPixel( long nX, long nY )
{
    // draw pixel with current line color
    ImplDrawPixel( nX, nY, maLineColor );
}

void AquaSalGraphics::drawPixel( long nX, long nY, SalColor nSalColor )
{
    const RGBAColor aPixelColor( nSalColor );
    ImplDrawPixel( nX, nY, aPixelColor );
}

bool AquaSalGraphics::drawPolyLine(
    const ::basegfx::B2DPolygon& rPolyLine,
    double fTransparency,
    const ::basegfx::B2DVector& rLineWidths,
    basegfx::B2DLineJoin eLineJoin,
    com::sun::star::drawing::LineCap eLineCap)
{
    // short circuit if there is nothing to do
    const int nPointCount = rPolyLine.count();
    if( nPointCount <= 0 )
    {
        return true;
    }
    // reject requests that cannot be handled yet
    if( rLineWidths.getX() != rLineWidths.getY() )
    {
        return false;
    }
    // #i101491# Aqua does not support B2DLINEJOIN_NONE; return false to use
    // the fallback (own geometry preparation)
    // #i104886# linejoin-mode and thus the above only applies to "fat" lines
    if( (basegfx::B2DLINEJOIN_NONE == eLineJoin) &&
        (rLineWidths.getX() > 1.3) )
    {
        return false;
    }
    // setup line attributes
    CGLineJoin aCGLineJoin = kCGLineJoinMiter;
    switch( eLineJoin )
    {
    case ::basegfx::B2DLINEJOIN_NONE: aCGLineJoin = /*TODO?*/kCGLineJoinMiter; break;
    case ::basegfx::B2DLINEJOIN_MIDDLE: aCGLineJoin = /*TODO?*/kCGLineJoinMiter; break;
    case ::basegfx::B2DLINEJOIN_BEVEL: aCGLineJoin = kCGLineJoinBevel; break;
    case ::basegfx::B2DLINEJOIN_MITER: aCGLineJoin = kCGLineJoinMiter; break;
    case ::basegfx::B2DLINEJOIN_ROUND: aCGLineJoin = kCGLineJoinRound; break;
    }

    // setup cap attribute
    CGLineCap aCGLineCap(kCGLineCapButt);

    switch(eLineCap)
    {
        default: // com::sun::star::drawing::LineCap_BUTT:
        {
            aCGLineCap = kCGLineCapButt;
            break;
        }
        case com::sun::star::drawing::LineCap_ROUND:
        {
            aCGLineCap = kCGLineCapRound;
            break;
        }
        case com::sun::star::drawing::LineCap_SQUARE:
        {
            aCGLineCap = kCGLineCapSquare;
            break;
        }
    }

    // setup poly-polygon path
    CGMutablePathRef xPath = CGPathCreateMutable();
    AddPolygonToPath( xPath, rPolyLine, rPolyLine.isClosed(), !getAntiAliasB2DDraw(), true );

    const CGRect aRefreshRect = CGPathGetBoundingBox( xPath );
    // #i97317# workaround for Quartz having problems with drawing small polygons
    if( ! ((aRefreshRect.size.width <= 0.125) && (aRefreshRect.size.height <= 0.125)) )
    {
        // use the path to prepare the graphics context
        CGContextSaveGState( mrContext );
        CGContextAddPath( mrContext, xPath );
        // draw path with antialiased line
        CGContextSetShouldAntialias( mrContext, true );
        CGContextSetAlpha( mrContext, 1.0 - fTransparency );
        CGContextSetLineJoin( mrContext, aCGLineJoin );
        CGContextSetLineCap( mrContext, aCGLineCap );
        CGContextSetLineWidth( mrContext, rLineWidths.getX() );
        CGContextDrawPath( mrContext, kCGPathStroke );
        CGContextRestoreGState( mrContext );

        // mark modified rectangle as updated
        RefreshRect( aRefreshRect );
    }

    CGPathRelease( xPath );

    return true;
}

sal_Bool AquaSalGraphics::drawPolyLineBezier( sal_uLong, const SalPoint*, const sal_uInt8* )
{
    return sal_False;
}

bool AquaSalGraphics::drawPolyPolygon( const ::basegfx::B2DPolyPolygon& rPolyPoly,
    double fTransparency )
{
    // short circuit if there is nothing to do
    const int nPolyCount = rPolyPoly.count();
    if( nPolyCount <= 0 )
    {
        return true;
    }
    // ignore invisible polygons
    if( (fTransparency >= 1.0) || (fTransparency < 0) )
    {
        return true;
    }
    // setup poly-polygon path
    CGMutablePathRef xPath = CGPathCreateMutable();
    for( int nPolyIdx = 0; nPolyIdx < nPolyCount; ++nPolyIdx )
    {
        const ::basegfx::B2DPolygon rPolygon = rPolyPoly.getB2DPolygon( nPolyIdx );
        AddPolygonToPath( xPath, rPolygon, true, !getAntiAliasB2DDraw(), IsPenVisible() );
    }

    const CGRect aRefreshRect = CGPathGetBoundingBox( xPath );
    // #i97317# workaround for Quartz having problems with drawing small polygons
    if( ! ((aRefreshRect.size.width <= 0.125) && (aRefreshRect.size.height <= 0.125)) )
    {
        // use the path to prepare the graphics context
        CGContextSaveGState( mrContext );
        CGContextBeginPath( mrContext );
        CGContextAddPath( mrContext, xPath );

        // draw path with antialiased polygon
        CGContextSetShouldAntialias( mrContext, true );
        CGContextSetAlpha( mrContext, 1.0 - fTransparency );
        CGContextDrawPath( mrContext, kCGPathEOFillStroke );
        CGContextRestoreGState( mrContext );

        // mark modified rectangle as updated
        RefreshRect( aRefreshRect );
    }

    CGPathRelease( xPath );

    return true;
}

void AquaSalGraphics::drawPolyPolygon( sal_uInt32 nPolyCount, const sal_uInt32 *pPoints, PCONSTSALPOINT  *ppPtAry )
{
    if( nPolyCount <= 0 )
        return;
    if( !CheckContext() )
        return;

    // find bound rect
    long leftX = 0, topY = 0, maxWidth = 0, maxHeight = 0;
    getBoundRect( pPoints[0], ppPtAry[0], leftX, topY, maxWidth, maxHeight );
    for( sal_uLong n = 1; n < nPolyCount; n++ )
    {
        long nX = leftX, nY = topY, nW = maxWidth, nH = maxHeight;
        getBoundRect( pPoints[n], ppPtAry[n], nX, nY, nW, nH );
        if( nX < leftX )
        {
            maxWidth += leftX - nX;
            leftX = nX;
        }
        if( nY < topY )
        {
            maxHeight += topY - nY;
            topY = nY;
        }
        if( nX + nW > leftX + maxWidth )
        {
            maxWidth = nX + nW - leftX;
        }
        if( nY + nH > topY + maxHeight )
        {
            maxHeight = nY + nH - topY;
        }
    }

    // prepare drawing mode
    CGPathDrawingMode eMode;
    if( IsBrushVisible() && IsPenVisible() )
    {
        eMode = kCGPathEOFillStroke;
    }
    else if( IsPenVisible() )
    {
        eMode = kCGPathStroke;
    }
    else if( IsBrushVisible() )
    {
        eMode = kCGPathEOFill;
    }
    else
    {
        return;
    }
    // convert to CGPath
    CGContextBeginPath( mrContext );
    if( IsPenVisible() )
    {
        for( sal_uLong nPoly = 0; nPoly < nPolyCount; nPoly++ )
        {
            const sal_uLong nPoints = pPoints[nPoly];
            if( nPoints > 1 )
            {
                const SalPoint *pPtAry = ppPtAry[nPoly];
                float fX, fY;
                alignLinePoint( pPtAry, fX, fY );
                CGContextMoveToPoint( mrContext, fX, fY );
                pPtAry++;
                for( sal_uLong nPoint = 1; nPoint < nPoints; nPoint++, pPtAry++ )
                {
                    alignLinePoint( pPtAry, fX, fY );
                    CGContextAddLineToPoint( mrContext, fX, fY );
                }
                CGContextClosePath(mrContext);
            }
        }
    }
    else
    {
        for( sal_uLong nPoly = 0; nPoly < nPolyCount; nPoly++ )
        {
            const sal_uLong nPoints = pPoints[nPoly];
            if( nPoints > 1 )
            {
                const SalPoint *pPtAry = ppPtAry[nPoly];
                CGContextMoveToPoint( mrContext, pPtAry->mnX, pPtAry->mnY );
                pPtAry++;
                for( sal_uLong nPoint = 1; nPoint < nPoints; nPoint++, pPtAry++ )
                {
                    CGContextAddLineToPoint( mrContext, pPtAry->mnX, pPtAry->mnY );
                }
                CGContextClosePath(mrContext);
            }
        }
    }

    CGContextDrawPath( mrContext, eMode );

    RefreshRect( leftX, topY, maxWidth, maxHeight );
}

void AquaSalGraphics::drawPolygon( sal_uLong nPoints, const SalPoint *pPtAry )
{
    if( nPoints <= 1 )
        return;
    if( !CheckContext() )
        return;

    long nX = 0, nY = 0, nWidth = 0, nHeight = 0;
    getBoundRect( nPoints, pPtAry, nX, nY, nWidth, nHeight );

    CGPathDrawingMode eMode;
    if( IsBrushVisible() && IsPenVisible() )
    {
        eMode = kCGPathEOFillStroke;
    }
    else if( IsPenVisible() )
    {
        eMode = kCGPathStroke;
    }
    else if( IsBrushVisible() )
    {
        eMode = kCGPathEOFill;
    }
    else
    {
        return;
    }
    CGContextBeginPath( mrContext );

    if( IsPenVisible() )
    {
        float fX, fY;
        alignLinePoint( pPtAry, fX, fY );
        CGContextMoveToPoint( mrContext, fX, fY );
        pPtAry++;
        for( sal_uLong nPoint = 1; nPoint < nPoints; nPoint++, pPtAry++ )
        {
            alignLinePoint( pPtAry, fX, fY );
            CGContextAddLineToPoint( mrContext, fX, fY );
        }
    }
    else
    {
        CGContextMoveToPoint( mrContext, pPtAry->mnX, pPtAry->mnY );
        pPtAry++;
        for( sal_uLong nPoint = 1; nPoint < nPoints; nPoint++, pPtAry++ )
        {
            CGContextAddLineToPoint( mrContext, pPtAry->mnX, pPtAry->mnY );
        }
    }

    CGContextClosePath( mrContext );
    CGContextDrawPath( mrContext, eMode );
    RefreshRect( nX, nY, nWidth, nHeight );
}

sal_Bool AquaSalGraphics::drawPolygonBezier( sal_uLong, const SalPoint*, const sal_uInt8* )
{
    return sal_False;
}

sal_Bool AquaSalGraphics::drawPolyPolygonBezier( sal_uInt32, const sal_uInt32*,
                                                 const SalPoint* const*, const sal_uInt8* const* )
{
    return sal_False;
}

void AquaSalGraphics::drawRect( long nX, long nY, long nWidth, long nHeight )
{
    if( !CheckContext() )
    {
        return;
    }
    CGRect aRect( CGRectMake(nX, nY, nWidth, nHeight) );
    if( IsPenVisible() )
    {
        aRect.origin.x      += 0.5;
        aRect.origin.y      += 0.5;
        aRect.size.width    -= 1;
        aRect.size.height -= 1;
    }

    if( IsBrushVisible() )
    {
        CGContextFillRect( mrContext, aRect );
    }
    if( IsPenVisible() )
    {
        CGContextStrokeRect( mrContext, aRect );
    }
    RefreshRect( nX, nY, nWidth, nHeight );
}


void AquaSalGraphics::drawPolyLine( sal_uLong nPoints, const SalPoint *pPtAry )
{
    if( nPoints < 1 )
    {
        return;
    }
    if( !CheckContext() )
    {
        return;
    }

    long nX = 0, nY = 0, nWidth = 0, nHeight = 0;
    getBoundRect( nPoints, pPtAry, nX, nY, nWidth, nHeight );

    float fX, fY;
    CGContextBeginPath( mrContext );
    alignLinePoint( pPtAry, fX, fY );
    CGContextMoveToPoint( mrContext, fX, fY );
    pPtAry++;
    for( sal_uLong nPoint = 1; nPoint < nPoints; nPoint++, pPtAry++ )
    {
        alignLinePoint( pPtAry, fX, fY );
        CGContextAddLineToPoint( mrContext, fX, fY );
    }
    CGContextDrawPath( mrContext, kCGPathStroke );

    RefreshRect( nX, nY, nWidth, nHeight );
}

sal_uInt16 AquaSalGraphics::GetBitCount() const
{
    sal_uInt16 nBits = mnBitmapDepth ? mnBitmapDepth : 32;//24;
    return nBits;
}

SalBitmap* AquaSalGraphics::getBitmap( long  nX, long  nY, long  nDX, long  nDY )
{
    DBG_ASSERT( mxLayer, "AquaSalGraphics::getBitmap() with no layer" );

    ApplyXorContext();

    QuartzSalBitmap* pBitmap = new QuartzSalBitmap;
    if( !pBitmap->Create( mxLayer, mnBitmapDepth, nX, nY, nDX, nDY) )
    {
        delete pBitmap;
        pBitmap = NULL;
    }

    return pBitmap;
}

#ifndef IOS

SystemGraphicsData AquaSalGraphics::GetGraphicsData() const
{
    SystemGraphicsData aRes;
    aRes.nSize = sizeof(aRes);
    aRes.rCGContext = mrContext;
    return aRes;
}

long AquaSalGraphics::GetGraphicsWidth() const
{
    long w = 0;
    if( mrContext && (mbWindow || mbVirDev) )
    {
        w = mnWidth;
    }

    if( w == 0 )
    {
        if( mbWindow && mpFrame )
        {
            w = mpFrame->maGeometry.nWidth;
        }
    }
    return w;
}

SalColor AquaSalGraphics::getPixel( long nX, long nY )
{
    // return default value on printers or when out of bounds
    if( !mxLayer || (nX < 0) || (nX >= mnWidth) ||
        (nY < 0) || (nY >= mnHeight))
    {
        return COL_BLACK;
    }
    // prepare creation of matching a CGBitmapContext
    CGColorSpaceRef aCGColorSpace = GetSalData()->mxRGBSpace;
    CGBitmapInfo aCGBmpInfo = kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Big;
#if defined OSL_BIGENDIAN
    struct{ unsigned char b, g, r, a; } aPixel;
#else
    struct{ unsigned char a, r, g, b; } aPixel;
#endif

    // create a one-pixel bitmap context
    // TODO: is it worth to cache it?
    CGContextRef xOnePixelContext =
        CGBitmapContextCreate( &aPixel, 1, 1, 8, sizeof(aPixel),
                               aCGColorSpace, aCGBmpInfo );

    // update this graphics layer
    ApplyXorContext();

    // copy the requested pixel into the bitmap context
    if( IsFlipped() )
    {
        nY = mnHeight - nY;
    }
    const CGPoint aCGPoint = CGPointMake(-nX, -nY);
    CGContextDrawLayerAtPoint( xOnePixelContext, aCGPoint, mxLayer );
    CGContextRelease( xOnePixelContext );

    SalColor nSalColor = MAKE_SALCOLOR( aPixel.r, aPixel.g, aPixel.b );
    return nSalColor;
}

void AquaSalGraphics::GetResolution( sal_Int32& rDPIX, sal_Int32& rDPIY )
{
    if( !mnRealDPIY )
    {
        initResolution( (mbWindow && mpFrame) ? mpFrame->getNSWindow() : nil );
    }

    rDPIX = mnRealDPIX;
    rDPIY = mnRealDPIY;
}

#endif

void AquaSalGraphics::ImplDrawPixel( long nX, long nY, const RGBAColor& rColor )
{
    if( !CheckContext() )
    {
        return;
    }
    // overwrite the fill color
    CGContextSetFillColor( mrContext, rColor.AsArray() );
    // draw 1x1 rect, there is no pixel drawing in Quartz
    const CGRect aDstRect = CGRectMake(nX, nY, 1, 1);
    CGContextFillRect( mrContext, aDstRect );
    RefreshRect( aDstRect );
    // reset the fill color
    CGContextSetFillColor( mrContext, maFillColor.AsArray() );
}

#ifndef IOS

void AquaSalGraphics::initResolution( NSWindow* )
{
    // #i100617# read DPI only once; there is some kind of weird caching going on
    // if the main screen changes
    // FIXME: this is really unfortunate and needs to be investigated

    SalData* pSalData = GetSalData();
    if( pSalData->mnDPIX == 0 || pSalData->mnDPIY == 0 )
    {
        NSScreen* pScreen = nil;

        /* #i91301#
        many woes went into the try to have different resolutions
        on different screens. The result of these trials is that OOo is not ready
        for that yet, vcl and applications would need to be adapted.

        Unfortunately this is not possible in the 3.0 timeframe.
        So let's stay with one resolution for all Windows and VirtualDevices
        which is the resolution of the main screen

        This of course also means that measurements are exact only on the main screen.
        For activating different resolutions again just comment out the two lines below.

        if( pWin )
        pScreen = [pWin screen];
        */
        if( pScreen == nil )
        {
            NSArray* pScreens = [NSScreen screens];
            if( pScreens )
                pScreen = [pScreens objectAtIndex: 0];
        }

        mnRealDPIX = mnRealDPIY = 96;
        if( pScreen )
        {
            NSDictionary* pDev = [pScreen deviceDescription];
            if( pDev )
            {
                NSNumber* pVal = [pDev objectForKey: @"NSScreenNumber"];
                if( pVal )
                {
                    // FIXME: casting a long to CGDirectDisplayID is evil, but
                    // Apple suggest to do it this way
                    const CGDirectDisplayID nDisplayID = (CGDirectDisplayID)[pVal longValue];
                    const CGSize aSize = CGDisplayScreenSize( nDisplayID ); // => result is in millimeters
                    mnRealDPIX = static_cast<long>((CGDisplayPixelsWide( nDisplayID ) * 25.4) / aSize.width);
                    mnRealDPIY = static_cast<long>((CGDisplayPixelsHigh( nDisplayID ) * 25.4) / aSize.height);
                }
                else
                {
                    OSL_FAIL( "no resolution found in device description" );
                }
            }
            else
            {
                OSL_FAIL( "no device description" );
            }
        }
        else
        {
            OSL_FAIL( "no screen found" );
        }

        // #i107076# maintaining size-WYSIWYG-ness causes many problems for
        //           low-DPI, high-DPI or for mis-reporting devices
        //           => it is better to limit the calculation result then
        static const int nMinDPI = 72;
        if( (mnRealDPIX < nMinDPI) || (mnRealDPIY < nMinDPI) )
        {
            mnRealDPIX = mnRealDPIY = nMinDPI;
        }
        static const int nMaxDPI = 200;
        if( (mnRealDPIX > nMaxDPI) || (mnRealDPIY > nMaxDPI) )
        {
            mnRealDPIX = mnRealDPIY = nMaxDPI;
        }
        // for OSX any anisotropy reported for the display resolution is best ignored (e.g. TripleHead2Go)
        mnRealDPIX = mnRealDPIY = (mnRealDPIX + mnRealDPIY + 1) / 2;

        pSalData->mnDPIX = mnRealDPIX;
        pSalData->mnDPIY = mnRealDPIY;
    }
    else
    {
        mnRealDPIX = pSalData->mnDPIX;
        mnRealDPIY = pSalData->mnDPIY;
    }
}

#endif

void AquaSalGraphics::invert( long nX, long nY, long nWidth, long nHeight, SalInvert nFlags )
{
    if ( CheckContext() )
    {
        CGRect aCGRect = CGRectMake( nX, nY, nWidth, nHeight);
        CGContextSaveGState(mrContext);

        if ( nFlags & SAL_INVERT_TRACKFRAME )
        {
            const CGFloat dashLengths[2]  = { 4.0, 4.0 };     // for drawing dashed line
            CGContextSetBlendMode( mrContext, kCGBlendModeDifference );
            CGContextSetRGBStrokeColor ( mrContext, 1.0, 1.0, 1.0, 1.0 );
            CGContextSetLineDash ( mrContext, 0, dashLengths, 2 );
            CGContextSetLineWidth( mrContext, 2.0);
            CGContextStrokeRect ( mrContext, aCGRect );
        }
        else if ( nFlags & SAL_INVERT_50 )
        {
            //CGContextSetAllowsAntialiasing( mrContext, false );
            CGContextSetBlendMode(mrContext, kCGBlendModeDifference);
            CGContextAddRect( mrContext, aCGRect );
            Pattern50Fill();
        }
        else // just invert
        {
            CGContextSetBlendMode(mrContext, kCGBlendModeDifference);
            CGContextSetRGBFillColor ( mrContext,1.0, 1.0, 1.0 , 1.0 );
            CGContextFillRect ( mrContext, aCGRect );
        }
        CGContextRestoreGState( mrContext);
        RefreshRect( aCGRect );
    }
}

void AquaSalGraphics::invert( sal_uLong nPoints, const SalPoint*  pPtAry, SalInvert nSalFlags )
{
    CGPoint* CGpoints ;
    if ( CheckContext() )
    {
        CGContextSaveGState(mrContext);
        CGpoints = makeCGptArray(nPoints,pPtAry);
        CGContextAddLines ( mrContext, CGpoints, nPoints );
        if ( nSalFlags & SAL_INVERT_TRACKFRAME )
        {
            const CGFloat dashLengths[2]  = { 4.0, 4.0 };     // for drawing dashed line
            CGContextSetBlendMode( mrContext, kCGBlendModeDifference );
            CGContextSetRGBStrokeColor ( mrContext, 1.0, 1.0, 1.0, 1.0 );
            CGContextSetLineDash ( mrContext, 0, dashLengths, 2 );
            CGContextSetLineWidth( mrContext, 2.0);
            CGContextStrokePath ( mrContext );
        }
        else if ( nSalFlags & SAL_INVERT_50 )
        {
            CGContextSetBlendMode(mrContext, kCGBlendModeDifference);
            Pattern50Fill();
        }
        else // just invert
        {
            CGContextSetBlendMode( mrContext, kCGBlendModeDifference );
            CGContextSetRGBFillColor( mrContext, 1.0, 1.0, 1.0, 1.0 );
            CGContextFillPath( mrContext );
        }
        const CGRect aRefreshRect = CGContextGetClipBoundingBox(mrContext);
        CGContextRestoreGState( mrContext);
        delete []  CGpoints;
        RefreshRect( aRefreshRect );
    }
}

void AquaSalGraphics::Pattern50Fill()
{
    static const CGFloat aFillCol[4] = { 1,1,1,1 };
    static const CGPatternCallbacks aCallback = { 0, &DrawPattern50, NULL };
    static const CGColorSpaceRef mxP50Space = CGColorSpaceCreatePattern( GetSalData()->mxRGBSpace );
    static const CGPatternRef mxP50Pattern = CGPatternCreate( NULL, CGRectMake( 0, 0, 4, 4 ),
                                                              CGAffineTransformIdentity, 4, 4,
                                                              kCGPatternTilingConstantSpacing,
                                                              false, &aCallback );
    CGContextSetFillColorSpace( mrContext, mxP50Space );
    CGContextSetFillPattern( mrContext, mxP50Pattern, aFillCol );
    CGContextFillPath( mrContext );
}


void AquaSalGraphics::ResetClipRegion()
{
    // release old path and indicate no clipping
    if( mxClipPath )
    {
        CGPathRelease( mxClipPath );
        mxClipPath = NULL;
    }
    if( CheckContext() )
    {
        SetState();
    }
}

void AquaSalGraphics::SetLineColor()
{
    maLineColor.SetAlpha( 0.0 );   // transparent
    if( CheckContext() )
    {
        CGContextSetStrokeColor( mrContext, maLineColor.AsArray() );
    }
}

void AquaSalGraphics::SetLineColor( SalColor nSalColor )
{
    maLineColor = RGBAColor( nSalColor );
    if( CheckContext() )
    {
        CGContextSetStrokeColor( mrContext, maLineColor.AsArray() );
    }
}

void AquaSalGraphics::SetFillColor()
{
    maFillColor.SetAlpha( 0.0 );   // transparent
    if( CheckContext() )
    {
        CGContextSetFillColor( mrContext, maFillColor.AsArray() );
    }
}

void AquaSalGraphics::SetFillColor( SalColor nSalColor )
{
    maFillColor = RGBAColor( nSalColor );
    if( CheckContext() )
    {
        CGContextSetFillColor( mrContext, maFillColor.AsArray() );
    }
}

bool AquaSalGraphics::supportsOperation( OutDevSupportType eType ) const
{
    bool bRet = false;
    switch( eType )
    {
    case OutDevSupport_TransparentRect:
    case OutDevSupport_B2DClip:
    case OutDevSupport_B2DDraw:
        bRet = true;
        break;
    default: break;
    }
    return bRet;
}

bool AquaSalGraphics::setClipRegion( const Region& i_rClip )
{
    // release old clip path
    if( mxClipPath )
    {
        CGPathRelease( mxClipPath );
        mxClipPath = NULL;
    }
    mxClipPath = CGPathCreateMutable();

    // set current path, either as polypolgon or sequence of rectangles
    if(i_rClip.HasPolyPolygonOrB2DPolyPolygon())
    {
        const basegfx::B2DPolyPolygon aClip(i_rClip.GetAsB2DPolyPolygon());

        AddPolyPolygonToPath( mxClipPath, aClip, !getAntiAliasB2DDraw(), false );
    }
    else
    {
        RectangleVector aRectangles;
        i_rClip.GetRegionRectangles(aRectangles);

        for(RectangleVector::const_iterator aRectIter(aRectangles.begin()); aRectIter != aRectangles.end(); ++aRectIter)
        {
            const long nW(aRectIter->Right() - aRectIter->Left() + 1); // uses +1 logic in original

            if(nW)
            {
                const long nH(aRectIter->Bottom() - aRectIter->Top() + 1); // uses +1 logic in original

                if(nH)
                {
                    const CGRect aRect = CGRectMake( aRectIter->Left(), aRectIter->Top(), nW, nH);
                    CGPathAddRect( mxClipPath, NULL, aRect );
                }
            }
        }
    }
    // set the current path as clip region
    if( CheckContext() )
    {
        SetState();
    }
    return true;
}

void AquaSalGraphics::SetROPFillColor( SalROPColor nROPColor )
{
    if( ! mbPrinter )
        SetFillColor( ImplGetROPSalColor( nROPColor ) );
}

void AquaSalGraphics::SetROPLineColor( SalROPColor nROPColor )
{
    if( ! mbPrinter )
        SetLineColor( ImplGetROPSalColor( nROPColor ) );
}

void AquaSalGraphics::SetXORMode( bool bSet, bool bInvertOnly )
{
    // return early if XOR mode remains unchanged
    if( mbPrinter )
    {
        return;
    }
    if( ! bSet && mnXorMode == 2 )
    {
        CGContextSetBlendMode( mrContext, kCGBlendModeNormal );
        mnXorMode = 0;
        return;
    }
    else if( bSet && bInvertOnly && mnXorMode == 0)
    {
        CGContextSetBlendMode( mrContext, kCGBlendModeDifference );
        mnXorMode = 2;
        return;
    }

    if( (mpXorEmulation == NULL) && !bSet )
    {
        return;
    }
    if( (mpXorEmulation != NULL) && (bSet == mpXorEmulation->IsEnabled()) )
    {
        return;
    }
    if( !CheckContext() )
    {
         return;
    }
    // prepare XOR emulation
    if( !mpXorEmulation )
    {
        mpXorEmulation = new XorEmulation();
        mpXorEmulation->SetTarget( mnWidth, mnHeight, mnBitmapDepth, mrContext, mxLayer );
    }

    // change the XOR mode
    if( bSet )
    {
        mpXorEmulation->Enable();
        mrContext = mpXorEmulation->GetMaskContext();
        mnXorMode = 1;
    }
    else
    {
        mpXorEmulation->UpdateTarget();
        mpXorEmulation->Disable();
        mrContext = mpXorEmulation->GetTargetContext();
        mnXorMode = 0;
    }
}

#ifndef IOS

void AquaSalGraphics::updateResolution()
{
    DBG_ASSERT( mbWindow, "updateResolution on inappropriate graphics" );

    initResolution( (mbWindow && mpFrame) ? mpFrame->getNSWindow() : nil );
}

#endif

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

XorEmulation::XorEmulation()
:   m_xTargetLayer( NULL )
,   m_xTargetContext( NULL )
,   m_xMaskContext( NULL )
,   m_xTempContext( NULL )
,   m_pMaskBuffer( NULL )
,   m_pTempBuffer( NULL )
,   m_nBufferLongs( 0 )
,   m_bIsEnabled( false )
{}

XorEmulation::~XorEmulation()
{
    Disable();
    SetTarget( 0, 0, 0, NULL, NULL );
}

void XorEmulation::SetTarget( int nWidth, int nHeight, int nTargetDepth,
                              CGContextRef xTargetContext, CGLayerRef xTargetLayer )
{
    // prepare to replace old mask+temp context
    if( m_xMaskContext )
    {
        // cleanup the mask context
        CGContextRelease( m_xMaskContext );
        delete[] m_pMaskBuffer;
        m_xMaskContext = NULL;
        m_pMaskBuffer = NULL;

        // cleanup the temp context if needed
        if( m_xTempContext )
        {
            CGContextRelease( m_xTempContext );
            delete[] m_pTempBuffer;
            m_xTempContext = NULL;
            m_pTempBuffer = NULL;
        }
    }

    // return early if there is nothing more to do
    if( !xTargetContext )
    {
        return;
    }
    // retarget drawing operations to the XOR mask
    m_xTargetLayer = xTargetLayer;
    m_xTargetContext = xTargetContext;

    // prepare creation of matching CGBitmaps
    CGColorSpaceRef aCGColorSpace = GetSalData()->mxRGBSpace;
    CGBitmapInfo aCGBmpInfo = kCGImageAlphaNoneSkipFirst;
    int nBitDepth = nTargetDepth;
    if( !nBitDepth )
    {
        nBitDepth = 32;
    }
    int nBytesPerRow = (nBitDepth == 16) ? 2 : 4;
    const size_t nBitsPerComponent = (nBitDepth == 16) ? 5 : 8;
    if( nBitDepth <= 8 )
    {
        aCGColorSpace = GetSalData()->mxGraySpace;
        aCGBmpInfo = kCGImageAlphaNone;
        nBytesPerRow = 1;
    }
    nBytesPerRow *= nWidth;
    m_nBufferLongs = (nHeight * nBytesPerRow + sizeof(sal_uLong)-1) / sizeof(sal_uLong);

    // create a XorMask context
    m_pMaskBuffer = new sal_uLong[ m_nBufferLongs ];
    m_xMaskContext = CGBitmapContextCreate( m_pMaskBuffer,
                                            nWidth, nHeight,
                                            nBitsPerComponent, nBytesPerRow,
                                            aCGColorSpace, aCGBmpInfo );
    // reset the XOR mask to black
    memset( m_pMaskBuffer, 0, m_nBufferLongs * sizeof(sal_uLong) );

    // a bitmap context will be needed for manual XORing
    // create one unless the target context is a bitmap context
    if( nTargetDepth )
        m_pTempBuffer = (sal_uLong*)CGBitmapContextGetData( m_xTargetContext );
    if( !m_pTempBuffer )
    {
        // create a bitmap context matching to the target context
        m_pTempBuffer = new sal_uLong[ m_nBufferLongs ];
        m_xTempContext = CGBitmapContextCreate( m_pTempBuffer,
                                                nWidth, nHeight,
                                                nBitsPerComponent, nBytesPerRow,
                                                aCGColorSpace, aCGBmpInfo );
    }

    // initialize XOR mask context for drawing
    CGContextSetFillColorSpace( m_xMaskContext, aCGColorSpace );
    CGContextSetStrokeColorSpace( m_xMaskContext, aCGColorSpace );
    CGContextSetShouldAntialias( m_xMaskContext, false );

    // improve the XorMask's XOR emulation a litte
    // NOTE: currently only enabled for monochrome contexts
    if( aCGColorSpace == GetSalData()->mxGraySpace )
    {
        CGContextSetBlendMode( m_xMaskContext, kCGBlendModeDifference );
    }
    // intialize the transformation matrix to the drawing target
    const CGAffineTransform aCTM = CGContextGetCTM( xTargetContext );
    CGContextConcatCTM( m_xMaskContext, aCTM );
    if( m_xTempContext )
    {
        CGContextConcatCTM( m_xTempContext, aCTM );
    }
    // initialize the default XorMask graphics state
    CGContextSaveGState( m_xMaskContext );
}

bool XorEmulation::UpdateTarget()
{
    if( !IsEnabled() )
    {
        return false;
    }
    // update the temp bitmap buffer if needed
    if( m_xTempContext )
    {
        CGContextDrawLayerAtPoint( m_xTempContext, CGPointZero, m_xTargetLayer );
    }
    // do a manual XOR with the XorMask
    // this approach suffices for simple color manipulations
    // and also the complex-clipping-XOR-trick used in metafiles
    const sal_uLong* pSrc = m_pMaskBuffer;
    sal_uLong* pDst = m_pTempBuffer;
    for( int i = m_nBufferLongs; --i >= 0;)
    {
        *(pDst++) ^= *(pSrc++);
    }
    // write back the XOR results to the target context
    if( m_xTempContext )
    {
        CGImageRef xXorImage = CGBitmapContextCreateImage( m_xTempContext );
        const int nWidth  = (int)CGImageGetWidth( xXorImage );
        const int nHeight = (int)CGImageGetHeight( xXorImage );
        // TODO: update minimal changerect
        const CGRect aFullRect = CGRectMake(0, 0, nWidth, nHeight);
        CGContextDrawImage( m_xTargetContext, aFullRect, xXorImage );
        CGImageRelease( xXorImage );
    }

    // reset the XorMask to black again
    // TODO: not needed for last update
    memset( m_pMaskBuffer, 0, m_nBufferLongs * sizeof(sal_uLong) );

    // TODO: return FALSE if target was not changed
    return true;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */