/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: zbufferprocessor3d.cxx,v $
 *
 *  $Revision: 1.5 $
 *
 *  last change: $Author: aw $ $Date: 2008-06-24 15:31:09 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

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

#include <drawinglayer/processor3d/zbufferprocessor3d.hxx>
#include <basegfx/raster/bpixelraster.hxx>
#include <vcl/bmpacc.hxx>
#include <basegfx/raster/rasterconvert3d.hxx>
#include <basegfx/raster/bzpixelraster.hxx>
#include <drawinglayer/attribute/materialattribute3d.hxx>
#include <drawinglayer/texture/texture.hxx>
#include <drawinglayer/attribute/sdrattribute3d.hxx>
#include <drawinglayer/primitive3d/drawinglayer_primitivetypes3d.hxx>
#include <drawinglayer/primitive3d/textureprimitive3d.hxx>
#include <drawinglayer/primitive3d/polygonprimitive3d.hxx>
#include <drawinglayer/primitive3d/polypolygonprimitive3d.hxx>
#include <drawinglayer/geometry/viewinformation2d.hxx>
#include <basegfx/polygon/b3dpolygontools.hxx>

//////////////////////////////////////////////////////////////////////////////

using namespace com::sun::star;

//////////////////////////////////////////////////////////////////////////////

namespace
{
    BitmapEx BPixelRasterToBitmapEx(const basegfx::BPixelRaster& rRaster, sal_uInt16 mnAntiAlialize)
    {
        BitmapEx aRetval;
        const sal_uInt32 nWidth(mnAntiAlialize ? rRaster.getWidth()/mnAntiAlialize : rRaster.getWidth());
        const sal_uInt32 nHeight(mnAntiAlialize ? rRaster.getHeight()/mnAntiAlialize : rRaster.getHeight());

        if(nWidth && nHeight)
        {
            const Size aDestSize(nWidth, nHeight);
            sal_uInt8 nInitAlpha(255);
            Bitmap aContent(aDestSize, 24);
            AlphaMask aAlpha(aDestSize, &nInitAlpha);
            BitmapWriteAccess* pContent = aContent.AcquireWriteAccess();
            BitmapWriteAccess* pAlpha = aAlpha.AcquireWriteAccess();

            if(pContent && pAlpha)
            {
                if(mnAntiAlialize)
                {
                    const sal_uInt16 nDivisor(mnAntiAlialize * mnAntiAlialize);

                    for(sal_uInt32 y(0L); y < nHeight; y++)
                    {
                        for(sal_uInt32 x(0L); x < nWidth; x++)
                        {
                            sal_uInt16 nRed(0);
                            sal_uInt16 nGreen(0);
                            sal_uInt16 nBlue(0);
                            sal_uInt16 nOpacity(0);
                            sal_uInt32 nIndex(rRaster.getIndexFromXY(x * mnAntiAlialize, y * mnAntiAlialize));

                            for(sal_uInt32 c(0); c < mnAntiAlialize; c++)
                            {
                                for(sal_uInt32 d(0); d < mnAntiAlialize; d++)
                                {
                                    const basegfx::BPixel& rPixel(rRaster.getBPixel(nIndex++));
                                    nRed = nRed + rPixel.getRed();
                                    nGreen = nGreen + rPixel.getGreen();
                                    nBlue = nBlue + rPixel.getBlue();
                                    nOpacity = nOpacity + rPixel.getOpacity();
                                }

                                nIndex += rRaster.getWidth() - mnAntiAlialize;
                            }

                            nOpacity = nOpacity / nDivisor;

                            if(nOpacity)
                            {
                                pContent->SetPixel(y, x, BitmapColor(
                                    (sal_uInt8)(nRed / nDivisor),
                                    (sal_uInt8)(nGreen / nDivisor),
                                    (sal_uInt8)(nBlue / nDivisor)));
                                pAlpha->SetPixel(y, x, BitmapColor(255 - (sal_uInt8)nOpacity));
                            }
                        }
                    }
                }
                else
                {
                    sal_uInt32 nIndex(0L);

                    for(sal_uInt32 y(0L); y < nHeight; y++)
                    {
                        for(sal_uInt32 x(0L); x < nWidth; x++)
                        {
                            const basegfx::BPixel& rPixel(rRaster.getBPixel(nIndex++));

                            if(rPixel.getOpacity())
                            {
                                pContent->SetPixel(y, x, BitmapColor(rPixel.getRed(), rPixel.getGreen(), rPixel.getBlue()));
                                pAlpha->SetPixel(y, x, BitmapColor(255 - rPixel.getOpacity()));
                            }
                        }
                    }
                }

                delete pContent;
                delete pAlpha;
            }

            aRetval = BitmapEx(aContent, aAlpha);

            // #i101811# set PrefMapMode and PrefSize at newly created Bitmap
            aRetval.SetPrefMapMode(MAP_100TH_MM);
            aRetval.SetPrefSize(Size(nWidth, nHeight));
        }

        return aRetval;
    }
} // end of anonymous namespace

//////////////////////////////////////////////////////////////////////////////

class ZBufferRasterConverter3D : public basegfx::RasterConverter3D
{
private:
    const drawinglayer::processor3d::DefaultProcessor3D&    mrProcessor;
    basegfx::BZPixelRaster&                                 mrBuffer;

    // interpolators for a single line span
    basegfx::ip_single                                      maIntZ;
    basegfx::ip_triple                                      maIntColor;
    basegfx::ip_triple                                      maIntNormal;
    basegfx::ip_double                                      maIntTexture;
    basegfx::ip_triple                                      maIntInvTexture;

    // current material to use for ratsreconversion
    const drawinglayer::attribute::MaterialAttribute3D*     mpCurrentMaterial;

    // bitfield
    // some boolean flags for line span interpolator usages
    unsigned                                                mbModifyColor : 1;
    unsigned                                                mbUseTex : 1;
    unsigned                                                mbHasTexCoor : 1;
    unsigned                                                mbHasInvTexCoor : 1;
    unsigned                                                mbUseNrm : 1;
    unsigned                                                mbUseCol : 1;

    void getTextureCoor(basegfx::B2DPoint& rTarget) const
    {
        if(mbHasTexCoor)
        {
            rTarget.setX(maIntTexture.getX().getVal());
            rTarget.setY(maIntTexture.getY().getVal());
        }
        else if(mbHasInvTexCoor)
        {
            const double fZFactor(maIntInvTexture.getZ().getVal());
            const double fInvZFactor(basegfx::fTools::equalZero(fZFactor) ? 1.0 : 1.0 / fZFactor);
            rTarget.setX(maIntInvTexture.getX().getVal() * fInvZFactor);
            rTarget.setY(maIntInvTexture.getY().getVal() * fInvZFactor);
        }
    }

    void incrementLineSpanInterpolators(double fStep)
    {
        maIntZ.increment(fStep);

        if(mbUseTex)
        {
            if(mbHasTexCoor)
            {
                maIntTexture.increment(fStep);
            }
            else if(mbHasInvTexCoor)
            {
                maIntInvTexture.increment(fStep);
            }
        }

        if(mbUseNrm)
        {
            maIntNormal.increment(fStep);
        }

        if(mbUseCol)
        {
            maIntColor.increment(fStep);
        }
    }

    double decideColorAndOpacity(basegfx::BColor& rColor)
    {
        // init values with full opacity and material color
        OSL_ENSURE(0 != mpCurrentMaterial, "CurrentMaterial not set (!)");
        double fOpacity(1.0);
        rColor = mpCurrentMaterial->getColor();

        if(mbUseTex)
        {
            basegfx::B2DPoint aTexCoor(0.0, 0.0);
            getTextureCoor(aTexCoor);

            if(mrProcessor.getGeoTexSvx())
            {
                // calc color in spot. This may also set to invisible already when
                // e.g. bitmap textures have transparent parts
                mrProcessor.getGeoTexSvx()->modifyBColor(aTexCoor, rColor, fOpacity);
            }

            if(basegfx::fTools::more(fOpacity, 0.0) && mrProcessor.getTransparenceGeoTexSvx())
            {
                // calc opacity. Object has a 2nd texture, a transparence texture
                mrProcessor.getTransparenceGeoTexSvx()->modifyOpacity(aTexCoor, fOpacity);
            }
        }

        if(basegfx::fTools::more(fOpacity, 0.0))
        {
            if(mrProcessor.getGeoTexSvx())
            {
                if(mbUseNrm)
                {
                    // blend texture with phong
                    rColor = mrProcessor.getSdrLightingAttribute().solveColorModel(
                        basegfx::B3DVector(maIntNormal.getX().getVal(), maIntNormal.getY().getVal(), maIntNormal.getZ().getVal()),
                        rColor,
                        mpCurrentMaterial->getSpecular(),
                        mpCurrentMaterial->getEmission(),
                        mpCurrentMaterial->getSpecularIntensity());
                }
                else if(mbUseCol)
                {
                    // blend texture with gouraud
                    basegfx::BColor aBlendColor(maIntColor.getX().getVal(), maIntColor.getY().getVal(), maIntColor.getZ().getVal());
                    rColor *= aBlendColor;
                }
                else if(mrProcessor.getModulate())
                {
                    // blend texture with single material color
                    rColor *= mpCurrentMaterial->getColor();
                }
            }
            else
            {
                if(mbUseNrm)
                {
                    // modify color with phong
                    rColor = mrProcessor.getSdrLightingAttribute().solveColorModel(
                        basegfx::B3DVector(maIntNormal.getX().getVal(), maIntNormal.getY().getVal(), maIntNormal.getZ().getVal()),
                        rColor,
                        mpCurrentMaterial->getSpecular(),
                        mpCurrentMaterial->getEmission(),
                        mpCurrentMaterial->getSpecularIntensity());
                }
                else if(mbUseCol)
                {
                    // modify color with gouraud
                    rColor.setRed(maIntColor.getX().getVal());
                    rColor.setGreen(maIntColor.getY().getVal());
                    rColor.setBlue(maIntColor.getZ().getVal());
                }
            }

            if(mbModifyColor)
            {
                rColor = mrProcessor.getBColorModifierStack().getModifiedColor(rColor);
            }
        }

        return fOpacity;
    }

    void setupLineSpanInterpolators(const basegfx::RasterConversionLineEntry3D& rA, const basegfx::RasterConversionLineEntry3D& rB)
    {
        // get inverse XDelta
        const double xInvDelta(1.0 / (rB.getX().getVal() - rA.getX().getVal()));

        // prepare Z-interpolator
        const double fZA(rA.getZ().getVal());
        const double fZB(rB.getZ().getVal());
        maIntZ = basegfx::ip_single(fZA, (fZB - fZA) * xInvDelta);

        // get bools and init other interpolators on demand accordingly
        mbModifyColor = mrProcessor.getBColorModifierStack().count();
        mbHasTexCoor = SCANLINE_EMPTY_INDEX != rA.getTextureIndex() && SCANLINE_EMPTY_INDEX != rB.getTextureIndex();
        mbHasInvTexCoor = SCANLINE_EMPTY_INDEX != rA.getInverseTextureIndex() && SCANLINE_EMPTY_INDEX != rB.getInverseTextureIndex();
        const bool bTextureActive(mrProcessor.getGeoTexSvx() || mrProcessor.getTransparenceGeoTexSvx());
        mbUseTex = bTextureActive && (mbHasTexCoor || mbHasInvTexCoor || mrProcessor.getSimpleTextureActive());
        const bool bUseColorTex(mbUseTex && mrProcessor.getGeoTexSvx());
        const bool bNeedNrmOrCol(!bUseColorTex || (bUseColorTex && mrProcessor.getModulate()));
        mbUseNrm = bNeedNrmOrCol && SCANLINE_EMPTY_INDEX != rA.getNormalIndex() && SCANLINE_EMPTY_INDEX != rB.getNormalIndex();
        mbUseCol = !mbUseNrm && bNeedNrmOrCol && SCANLINE_EMPTY_INDEX != rA.getColorIndex() && SCANLINE_EMPTY_INDEX != rB.getColorIndex();

        if(mbUseTex)
        {
            if(mbHasTexCoor)
            {
                const basegfx::ip_double& rTA(getTextureInterpolators()[rA.getTextureIndex()]);
                const basegfx::ip_double& rTB(getTextureInterpolators()[rB.getTextureIndex()]);
                maIntTexture = basegfx::ip_double(
                    rTA.getX().getVal(), (rTB.getX().getVal() - rTA.getX().getVal()) * xInvDelta,
                    rTA.getY().getVal(), (rTB.getY().getVal() - rTA.getY().getVal()) * xInvDelta);
            }
            else if(mbHasInvTexCoor)
            {
                const basegfx::ip_triple& rITA(getInverseTextureInterpolators()[rA.getInverseTextureIndex()]);
                const basegfx::ip_triple& rITB(getInverseTextureInterpolators()[rB.getInverseTextureIndex()]);
                maIntInvTexture = basegfx::ip_triple(
                    rITA.getX().getVal(), (rITB.getX().getVal() - rITA.getX().getVal()) * xInvDelta,
                    rITA.getY().getVal(), (rITB.getY().getVal() - rITA.getY().getVal()) * xInvDelta,
                    rITA.getZ().getVal(), (rITB.getZ().getVal() - rITA.getZ().getVal()) * xInvDelta);
            }
        }

        if(mbUseNrm)
        {
            const basegfx::ip_triple& rNA(getNormalInterpolators()[rA.getNormalIndex()]);
            const basegfx::ip_triple& rNB(getNormalInterpolators()[rB.getNormalIndex()]);
            maIntNormal = basegfx::ip_triple(
                rNA.getX().getVal(), (rNB.getX().getVal() - rNA.getX().getVal()) * xInvDelta,
                rNA.getY().getVal(), (rNB.getY().getVal() - rNA.getY().getVal()) * xInvDelta,
                rNA.getZ().getVal(), (rNB.getZ().getVal() - rNA.getZ().getVal()) * xInvDelta);
        }

        if(mbUseCol)
        {
            const basegfx::ip_triple& rCA(getColorInterpolators()[rA.getColorIndex()]);
            const basegfx::ip_triple& rCB(getColorInterpolators()[rB.getColorIndex()]);
            maIntColor = basegfx::ip_triple(
                rCA.getX().getVal(), (rCB.getX().getVal() - rCA.getX().getVal()) * xInvDelta,
                rCA.getY().getVal(), (rCB.getY().getVal() - rCA.getY().getVal()) * xInvDelta,
                rCA.getZ().getVal(), (rCB.getZ().getVal() - rCA.getZ().getVal()) * xInvDelta);
        }
    }

    virtual void processLineSpan(const basegfx::RasterConversionLineEntry3D& rA, const basegfx::RasterConversionLineEntry3D& rB, sal_Int32 nLine, sal_uInt32 nSpanCount);

public:
    ZBufferRasterConverter3D(basegfx::BZPixelRaster& rBuffer, const drawinglayer::processor3d::ZBufferProcessor3D& rProcessor)
    :   basegfx::RasterConverter3D(),
        mrProcessor(rProcessor),
        mrBuffer(rBuffer),
        maIntZ(),
        maIntColor(),
        maIntNormal(),
        maIntTexture(),
        maIntInvTexture(),
        mpCurrentMaterial(0),
        mbModifyColor(false),
        mbUseTex(false),
        mbHasTexCoor(false),
        mbUseNrm(false),
        mbUseCol(false)
    {}

    void setCurrentMaterial(const drawinglayer::attribute::MaterialAttribute3D& rMaterial)
    {
        mpCurrentMaterial = &rMaterial;
    }
};

void ZBufferRasterConverter3D::processLineSpan(const basegfx::RasterConversionLineEntry3D& rA, const basegfx::RasterConversionLineEntry3D& rB, sal_Int32 nLine, sal_uInt32 nSpanCount)
{
    if(!(nSpanCount & 0x0001))
    {
        if(nLine >= 0 && nLine < (sal_Int32)mrBuffer.getHeight())
        {
            sal_uInt32 nXA(::std::min(mrBuffer.getWidth(), (sal_uInt32)::std::max((sal_Int32)0, basegfx::fround(rA.getX().getVal()))));
            const sal_uInt32 nXB(::std::min(mrBuffer.getWidth(), (sal_uInt32)::std::max((sal_Int32)0, basegfx::fround(rB.getX().getVal()))));

            if(nXA < nXB)
            {
                // prepare the span interpolators
                setupLineSpanInterpolators(rA, rB);

                // bring span interpolators to start condition by incrementing with the possible difference of
                // clamped and non-clamped XStart. Interpolators are setup relying on double precision
                // X-values, so that difference is the correct value to compensate for possible clampings
                incrementLineSpanInterpolators(static_cast<double>(nXA) - rA.getX().getVal());

                // prepare scanline index
                sal_uInt32 nScanlineIndex(mrBuffer.getIndexFromXY(nXA, static_cast<sal_uInt32>(nLine)));
                basegfx::BColor aNewColor;

                while(nXA < nXB)
                {
                    // early-test Z values if we need to do anything at all
                    const double fNewZ(::std::max(0.0, ::std::min((double)0xffff, maIntZ.getVal())));
                    const sal_uInt16 nNewZ(static_cast< sal_uInt16 >(fNewZ));
                    sal_uInt16& rOldZ(mrBuffer.getZ(nScanlineIndex));

                    if(nNewZ > rOldZ)
                    {
                        // detect color and opacity for this pixel
                        const sal_uInt16 nOpacity(::std::max((sal_Int16)0, static_cast< sal_Int16 >(decideColorAndOpacity(aNewColor) * 255.0)));

                        if(nOpacity > 0)
                        {
                            // avoid color overrun
                            aNewColor.clamp();

                            if(nOpacity >= 0x00ff)
                            {
                                // full opacity, set z and color
                                rOldZ = nNewZ;
                                mrBuffer.getBPixel(nScanlineIndex) = basegfx::BPixel(aNewColor, 0xff);
                            }
                            else
                            {
                                basegfx::BPixel& rDest = mrBuffer.getBPixel(nScanlineIndex);

                                if(rDest.getOpacity())
                                {
                                    // both transparent, mix color based on front pixel's opacity
                                    // (the new one)
                                    const sal_uInt16 nTransparence(0x0100 - nOpacity);
                                    rDest.setRed((sal_uInt8)(((rDest.getRed() * nTransparence) + ((sal_uInt16)(255.0 * aNewColor.getRed()) * nOpacity)) >> 8));
                                    rDest.setGreen((sal_uInt8)(((rDest.getGreen() * nTransparence) + ((sal_uInt16)(255.0 * aNewColor.getGreen()) * nOpacity)) >> 8));
                                    rDest.setBlue((sal_uInt8)(((rDest.getBlue() * nTransparence) + ((sal_uInt16)(255.0 * aNewColor.getBlue()) * nOpacity)) >> 8));

                                    if(0xff != rDest.getOpacity())
                                    {
                                        // destination is also transparent, mix opacities by weighting
                                        // old opacity with new pixel's transparence and adding new opacity
                                        rDest.setOpacity((sal_uInt8)(((rDest.getOpacity() * nTransparence) >> 8) + nOpacity));
                                    }
                                }
                                else
                                {
                                    // dest is not visible. Set color.
                                    rDest = basegfx::BPixel(aNewColor, (sal_uInt8)nOpacity);
                                }
                            }
                        }
                    }

                    // increments
                    nScanlineIndex++;
                    nXA++;
                    incrementLineSpanInterpolators(1.0);
                }
            }
        }
    }
}

//////////////////////////////////////////////////////////////////////////////

namespace drawinglayer
{
    namespace processor3d
    {
        // the processing method for a single, known primitive
        void ZBufferProcessor3D::processBasePrimitive3D(const primitive3d::BasePrimitive3D& rBasePrimitive)
        {
            // it is a BasePrimitive3D implementation, use getPrimitiveID() call for switch
            switch(rBasePrimitive.getPrimitiveID())
            {
                case PRIMITIVE3D_ID_ALPHATEXTUREPRIMITIVE3D :
                {
                    // AlphaTexturePrimitive3D
                    const primitive3d::AlphaTexturePrimitive3D& rPrimitive = static_cast< const primitive3d::AlphaTexturePrimitive3D& >(rBasePrimitive);

                    if(mbProcessTransparent)
                    {
                        impRenderGradientTexturePrimitive3D(rPrimitive, true);
                    }
                    else
                    {
                        mbContainsTransparent = true;
                    }
                    break;
                }
                case PRIMITIVE3D_ID_POLYGONHAIRLINEPRIMITIVE3D :
                {
                    // directdraw of PolygonHairlinePrimitive3D
                    const primitive3d::PolygonHairlinePrimitive3D& rPrimitive = static_cast< const primitive3d::PolygonHairlinePrimitive3D& >(rBasePrimitive);

                    // do something when either not transparent and no transMap, or transparent and a TransMap
                    if((bool)mbProcessTransparent == (0 != getTransparenceGeoTexSvx()))
                    {
                        impRenderPolygonHairlinePrimitive3D(rPrimitive);
                    }
                    break;
                }
                case PRIMITIVE3D_ID_POLYPOLYGONMATERIALPRIMITIVE3D :
                {
                    // directdraw of PolyPolygonMaterialPrimitive3D
                    const primitive3d::PolyPolygonMaterialPrimitive3D& rPrimitive = static_cast< const primitive3d::PolyPolygonMaterialPrimitive3D& >(rBasePrimitive);

                    // do something when either not transparent and no transMap, or transparent and a TransMap
                    if((bool)mbProcessTransparent == (0 != getTransparenceGeoTexSvx()))
                    {
                        impRenderPolyPolygonMaterialPrimitive3D(rPrimitive);
                    }
                    break;
                }
                default:
                {
                    // use the DefaultProcessor3D::processBasePrimitive3D()
                    DefaultProcessor3D::processBasePrimitive3D(rBasePrimitive);
                    break;
                }
            }
        }

        void ZBufferProcessor3D::processNonTransparent(const primitive3d::Primitive3DSequence& rSource)
        {
            if(mpBZPixelRaster)
            {
                mbProcessTransparent = false;
                mbContainsTransparent = false;
                process(rSource);
            }
        }

        void ZBufferProcessor3D::processTransparent(const primitive3d::Primitive3DSequence& rSource)
        {
            if(mpBZPixelRaster && mbContainsTransparent)
            {
                mbProcessTransparent = true;
                process(rSource);
            }
        }

        void ZBufferProcessor3D::rasterconvertB3DPolygon(const attribute::MaterialAttribute3D& rMaterial, const basegfx::B3DPolygon& rHairline) const
        {
            if(mpBZPixelRaster)
            {
                mpZBufferRasterConverter3D->setCurrentMaterial(rMaterial);

                if(mnAntiAlialize > 1)
                {
                    const bool bForceLineSnap(getOptionsDrawinglayer().IsAntiAliasing() && getOptionsDrawinglayer().IsSnapHorVerLinesToDiscrete());

                    if(bForceLineSnap)
                    {
                        basegfx::B3DHomMatrix aTransform;
                        basegfx::B3DPolygon aSnappedHairline(rHairline);
                        const double fScaleDown(1.0 / mnAntiAlialize);
                        const double fScaleUp(mnAntiAlialize);

                        // take oversampling out
                        aTransform.scale(fScaleDown, fScaleDown, 1.0);
                        aSnappedHairline.transform(aTransform);

                        // snap to integer
                        aSnappedHairline = basegfx::tools::snapPointsOfHorizontalOrVerticalEdges(aSnappedHairline);

                        // add oversampling again
                        aTransform.identity();
                        aTransform.scale(fScaleUp, fScaleUp, 1.0);

                        if(false)
                        {
                            // when really want to go to single pixel lines, move to center.
                            // Without this translation, all hor/ver hairlines will be centered exactly
                            // between two pixel lines (which looks best)
                            const double fTranslateToCenter(mnAntiAlialize * 0.5);
                            aTransform.translate(fTranslateToCenter, fTranslateToCenter, 0.0);
                        }

                        aSnappedHairline.transform(aTransform);

                        mpZBufferRasterConverter3D->rasterconvertB3DPolygon(aSnappedHairline, 0, mpBZPixelRaster->getHeight(), mnAntiAlialize);
                    }
                    else
                    {
                        mpZBufferRasterConverter3D->rasterconvertB3DPolygon(rHairline, 0, mpBZPixelRaster->getHeight(), mnAntiAlialize);
                    }
                }
                else
                {
                    mpZBufferRasterConverter3D->rasterconvertB3DPolygon(rHairline, 0, mpBZPixelRaster->getHeight(), 1);
                }
            }
        }

        void ZBufferProcessor3D::rasterconvertB3DPolyPolygon(const attribute::MaterialAttribute3D& rMaterial, const basegfx::B3DPolyPolygon& rFill) const
        {
            if(mpBZPixelRaster)
            {
                mpZBufferRasterConverter3D->setCurrentMaterial(rMaterial);
                mpZBufferRasterConverter3D->rasterconvertB3DPolyPolygon(rFill, &maInvEyeToView, 0, mpBZPixelRaster->getHeight());
            }
        }

        ZBufferProcessor3D::ZBufferProcessor3D(
            const geometry::ViewInformation3D& rViewInformation3D,
            const geometry::ViewInformation2D& rViewInformation2D,
            const attribute::SdrSceneAttribute& rSdrSceneAttribute,
            const attribute::SdrLightingAttribute& rSdrLightingAttribute,
            double fSizeX,
            double fSizeY,
            const basegfx::B2DRange& rVisiblePart,
            sal_uInt16 nAntiAlialize)
        :   DefaultProcessor3D(rViewInformation3D, rSdrSceneAttribute, rSdrLightingAttribute),
            mpBZPixelRaster(0),
            maInvEyeToView(),
            mpZBufferRasterConverter3D(0),
            mnAntiAlialize(nAntiAlialize),
            mbProcessTransparent(false),
            mbContainsTransparent(false)
        {
            // generate ViewSizes
            const double fFullViewSizeX((rViewInformation2D.getObjectToViewTransformation() * basegfx::B2DVector(fSizeX, 0.0)).getLength());
            const double fFullViewSizeY((rViewInformation2D.getObjectToViewTransformation() * basegfx::B2DVector(0.0, fSizeY)).getLength());
            const double fViewSizeX(fFullViewSizeX * rVisiblePart.getWidth());
            const double fViewSizeY(fFullViewSizeY * rVisiblePart.getHeight());

            // generate RasterWidth and RasterHeight
            const sal_uInt32 nRasterWidth((sal_uInt32)basegfx::fround(fViewSizeX) + 1);
            const sal_uInt32 nRasterHeight((sal_uInt32)basegfx::fround(fViewSizeY) + 1);

            if(nRasterWidth && nRasterHeight)
            {
                // create view unit buffer
                mpBZPixelRaster = new basegfx::BZPixelRaster(
                    mnAntiAlialize ? nRasterWidth * mnAntiAlialize : nRasterWidth,
                    mnAntiAlialize ? nRasterHeight * mnAntiAlialize : nRasterHeight);
                OSL_ENSURE(mpBZPixelRaster, "ZBufferProcessor3D: Could not allocate basegfx::BZPixelRaster (!)");

                // create DeviceToView for Z-Buffer renderer since Z is handled
                // different from standard 3D transformations (Z is mirrored). Also
                // the transformation includes the step from unit device coordinates
                // to discrete units ([-1.0 .. 1.0] -> [minDiscrete .. maxDiscrete]

                basegfx::B3DHomMatrix aDeviceToView;

                {
                    // step one:
                    //
                    // bring from [-1.0 .. 1.0] in X,Y and Z to [0.0 .. 1.0]. Also
                    // necessary to
                    // - flip Y due to screen orientation
                    // - flip Z due to Z-Buffer orientation from back to front

                    aDeviceToView.scale(0.5, -0.5, -0.5);
                    aDeviceToView.translate(0.5, 0.5, 0.5);
                }

                {
                    // step two:
                    //
                    // bring from [0.0 .. 1.0] in X,Y and Z to view cordinates
                    //
                    // #i102611#
                    // also: scale Z to [1.5 .. 65534.5]. Normally, a range of [0.0 .. 65535.0]
                    // could be used, but a 'unused' value is needed, so '0' is used what reduces
                    // the range to [1.0 .. 65535.0]. It has also shown that small numerical errors
                    // (smaller as basegfx::fTools::mfSmallValue, which is 0.000000001) happen.
                    // Instead of checking those by basegfx::fTools methods which would cost
                    // runtime, just add another 0.5 tolerance to the start and end of the Z-Buffer
                    // range, thus resulting in [1.5 .. 65534.5]
                    const double fMaxZDepth(65533.0);
                    aDeviceToView.translate(-rVisiblePart.getMinX(), -rVisiblePart.getMinY(), 0.0);

                    if(mnAntiAlialize)
                        aDeviceToView.scale(fFullViewSizeX * mnAntiAlialize, fFullViewSizeY * mnAntiAlialize, fMaxZDepth);
                    else
                        aDeviceToView.scale(fFullViewSizeX, fFullViewSizeY, fMaxZDepth);

                    aDeviceToView.translate(0.0, 0.0, 1.5);
                }

                // update local ViewInformation3D with own DeviceToView
                const geometry::ViewInformation3D aNewViewInformation3D(
                    getViewInformation3D().getObjectTransformation(),
                    getViewInformation3D().getOrientation(),
                    getViewInformation3D().getProjection(),
                    aDeviceToView,
                    getViewInformation3D().getViewTime(),
                    getViewInformation3D().getExtendedInformationSequence());
                updateViewInformation(aNewViewInformation3D);

                // prepare inverse EyeToView transformation. This can be done in constructor
                // since changes in object transformations when processing TransformPrimitive3Ds
                // do not influence this prepared partial transformation
                maInvEyeToView = getViewInformation3D().getDeviceToView() * getViewInformation3D().getProjection();
                maInvEyeToView.invert();

                // prepare maRasterRange
                maRasterRange.reset();
                maRasterRange.expand(basegfx::B2DPoint(0.0, 0.0));
                maRasterRange.expand(basegfx::B2DPoint(mpBZPixelRaster->getWidth(), mpBZPixelRaster->getHeight()));

                // create the raster converter
                mpZBufferRasterConverter3D = new ZBufferRasterConverter3D(*mpBZPixelRaster, *this);
            }
        }

        ZBufferProcessor3D::~ZBufferProcessor3D()
        {
            if(mpBZPixelRaster)
            {
                delete mpZBufferRasterConverter3D;
                delete mpBZPixelRaster;
            }
        }

        BitmapEx ZBufferProcessor3D::getBitmapEx() const
        {
            if(mpBZPixelRaster)
            {
                return BPixelRasterToBitmapEx(*mpBZPixelRaster, mnAntiAlialize);
            }

            return BitmapEx();
        }
    } // end of namespace processor3d
} // end of namespace drawinglayer

//////////////////////////////////////////////////////////////////////////////
// eof