drawtreevisiting.cxx

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/* -*- 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/log.hxx>
#include <pdfiprocessor.hxx>
#include <xmlemitter.hxx>
#include <pdfihelper.hxx>
#include <imagecontainer.hxx>
#include "style.hxx"
#include "drawtreevisiting.hxx"
#include <genericelements.hxx>
 
#include <basegfx/polygon/b2dpolypolygontools.hxx>
#include <osl/diagnose.h>
#include <rtl/math.hxx>
#include <com/sun/star/i18n/BreakIterator.hpp>
#include <com/sun/star/i18n/CharacterClassification.hpp>
#include <com/sun/star/i18n/ScriptType.hpp>
#include <com/sun/star/i18n/DirectionProperty.hpp>
#include <comphelper/string.hxx>
 
#include <string.h>
#include <string_view>
 
using namespace ::com::sun::star;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::i18n;
using namespace ::com::sun::star::uno;
 
namespace pdfi
{
 
const Reference< XBreakIterator >& DrawXmlOptimizer::GetBreakIterator()
{
    if ( !mxBreakIter.is() )
    {
        Reference< XComponentContext > xContext( m_rProcessor.m_xContext, uno::UNO_SET_THROW );
        mxBreakIter = BreakIterator::create(xContext);
    }
    return mxBreakIter;
}
 
const Reference< XCharacterClassification >& DrawXmlEmitter::GetCharacterClassification()
{
    if ( !mxCharClass.is() )
    {
        Reference< XComponentContext > xContext( m_rEmitContext.m_xContext, uno::UNO_SET_THROW );
        mxCharClass = CharacterClassification::create(xContext);
    }
    return mxCharClass;
}
 
void DrawXmlEmitter::visit( HyperlinkElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&   )
{
    if( elem.Children.empty() )
        return;
 
    const char* pType = dynamic_cast<DrawElement*>(elem.Children.front().get()) ? "draw:a" : "text:a";
 
    PropertyMap aProps;
    aProps[ "xlink:type" ] = "simple";
    aProps[ "xlink:href" ] = elem.URI;
    aProps[ "office:target-frame-name" ] = "_blank";
    aProps[ "xlink:show" ] = "new";
 
    m_rEmitContext.rEmitter.beginTag( pType, aProps );
    auto this_it = elem.Children.begin();
    while( this_it != elem.Children.end() && this_it->get() != &elem )
    {
        (*this_it)->visitedBy( *this, this_it );
        ++this_it;
    }
    m_rEmitContext.rEmitter.endTag( pType );
}
 
void DrawXmlEmitter::visit( TextElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&   )
{
    if( elem.Text.isEmpty() )
        return;
 
    OUString strSpace(u' ');
    OUString strNbSpace(u'\x00A0');
    OUString tabSpace(u'\x0009');
    PropertyMap aProps;
    if( elem.StyleId != -1 )
    {
        aProps[ OUString( "text:style-name"  ) ] =
            m_rEmitContext.rStyles.getStyleName( elem.StyleId );
    }
 
    OUString str(elem.Text.toString());
 
    // Check for RTL
    bool isRTL = false;
    Reference< i18n::XCharacterClassification > xCC( GetCharacterClassification() );
    if( xCC.is() )
    {
        for(int i=1; i< elem.Text.getLength(); i++)
        {
            css::i18n::DirectionProperty nType = static_cast<css::i18n::DirectionProperty>(xCC->getCharacterDirection( str, i ));
            if ( nType == css::i18n::DirectionProperty_RIGHT_TO_LEFT           ||
                 nType == css::i18n::DirectionProperty_RIGHT_TO_LEFT_ARABIC    ||
                 nType == css::i18n::DirectionProperty_RIGHT_TO_LEFT_EMBEDDING ||
                 nType == css::i18n::DirectionProperty_RIGHT_TO_LEFT_OVERRIDE
                )
                isRTL = true;
        }
    }
 
    if (isRTL)  // If so, reverse string
    {
        // First, produce mirrored-image for each code point which has the Bidi_Mirrored property.
        str = PDFIProcessor::SubstituteBidiMirrored(str);
        // Then, reverse the code points in the string, in backward order.
        str = ::comphelper::string::reverseCodePoints(str);
    }
 
    m_rEmitContext.rEmitter.beginTag( "text:span", aProps );
 
    aProps = {};
    for(int i=0; i< elem.Text.getLength(); i++)
    {
        OUString strToken=  str.copy(i,1) ;
        if( strSpace == strToken || strNbSpace == strToken )
        {
            aProps[ "text:c" ] = "1";
            m_rEmitContext.rEmitter.beginTag( "text:s", aProps );
            m_rEmitContext.rEmitter.endTag( "text:s");
        }
        else
        {
            if( tabSpace == strToken )
            {
                m_rEmitContext.rEmitter.beginTag( "text:tab", aProps );
                m_rEmitContext.rEmitter.endTag( "text:tab");
            }
            else
            {
                m_rEmitContext.rEmitter.write( strToken );
            }
        }
    }
 
    auto this_it = elem.Children.begin();
    while( this_it != elem.Children.end() && this_it->get() != &elem )
    {
        (*this_it)->visitedBy( *this, this_it );
        ++this_it;
    }
 
    m_rEmitContext.rEmitter.endTag( "text:span" );
}
 
void DrawXmlEmitter::visit( ParagraphElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&   )
{
    PropertyMap aProps;
    if( elem.StyleId != -1 )
    {
        aProps[ "text:style-name" ] = m_rEmitContext.rStyles.getStyleName( elem.StyleId );
    }
    const char* pTagType = "text:p";
    if( elem.Type == ParagraphElement::Headline )
        pTagType = "text:h";
    m_rEmitContext.rEmitter.beginTag( pTagType, aProps );
 
    auto this_it = elem.Children.begin();
    while( this_it != elem.Children.end() && this_it->get() != &elem )
    {
        (*this_it)->visitedBy( *this, this_it );
        ++this_it;
    }
 
    m_rEmitContext.rEmitter.endTag( pTagType );
}
 
void DrawXmlEmitter::fillFrameProps( DrawElement&       rElem,
                                     PropertyMap&       rProps,
                                     const EmitContext& rEmitContext,
                                     bool               bWasTransformed
                                     )
{
    static constexpr OUStringLiteral sDrawZIndex = u"draw:z-index";
    static constexpr OUStringLiteral sDrawStyleName = u"draw:style-name";
    static constexpr OUStringLiteral sDrawTextStyleName = u"draw:text-style-name";
    static constexpr OUStringLiteral sSvgX = u"svg:x";
    static constexpr OUStringLiteral sSvgY = u"svg:y";
    static constexpr OUStringLiteral sSvgWidth = u"svg:width";
    static constexpr OUStringLiteral sSvgHeight = u"svg:height";
    static constexpr OUStringLiteral sDrawTransform = u"draw:transform";
 
    rProps[ sDrawZIndex ] = OUString::number( rElem.ZOrder );
    rProps[ sDrawStyleName ] = rEmitContext.rStyles.getStyleName( rElem.StyleId );
 
    if (rElem.IsForText)
        rProps[ sDrawTextStyleName ] = rEmitContext.rStyles.getStyleName(rElem.TextStyleId);
 
    const GraphicsContext& rGC =
        rEmitContext.rProcessor.getGraphicsContext( rElem.GCId );
 
    if (bWasTransformed)
    {
        rProps[ sSvgX ]       = convertPixelToUnitString(rElem.x);
        rProps[ sSvgY ]       = convertPixelToUnitString(rElem.y);
        rProps[ sSvgWidth ]   = convertPixelToUnitString(rElem.w);
        rProps[ sSvgHeight ]  = convertPixelToUnitString(rElem.h);
    }
    else
    {
        basegfx::B2DHomMatrix mat(rGC.Transformation);
 
        if (rElem.MirrorVertical)
        {
            basegfx::B2DHomMatrix mat2;
            mat2.translate(0, -0.5);
            mat2.scale(1, -1);
            mat2.translate(0, 0.5);
            mat = mat * mat2;
        }
 
        double scale = convPx2mm(100);
        mat.scale(scale, scale);
 
        rProps[ sDrawTransform ] =
            OUString::Concat("matrix(")
            + OUString::number(mat.get(0, 0))
            + " "
            + OUString::number(mat.get(1, 0))
            + " "
            + OUString::number(mat.get(0, 1))
            + " "
            + OUString::number(mat.get(1, 1))
            + " "
            + OUString::number(mat.get(0, 2))
            + " "
            + OUString::number(mat.get(1, 2))
            + ")";
 
    }
}
 
void DrawXmlEmitter::visit( FrameElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&   )
{
    if( elem.Children.empty() )
        return;
 
    bool bTextBox = (dynamic_cast<ParagraphElement*>(elem.Children.front().get()) != nullptr);
    PropertyMap aFrameProps;
    fillFrameProps( elem, aFrameProps, m_rEmitContext, false );
    m_rEmitContext.rEmitter.beginTag( "draw:frame", aFrameProps );
    if( bTextBox )
        m_rEmitContext.rEmitter.beginTag( "draw:text-box", PropertyMap() );
 
    auto this_it = elem.Children.begin();
    while( this_it != elem.Children.end() && this_it->get() != &elem )
    {
        (*this_it)->visitedBy( *this, this_it );
        ++this_it;
    }
 
    if( bTextBox )
        m_rEmitContext.rEmitter.endTag( "draw:text-box" );
    m_rEmitContext.rEmitter.endTag( "draw:frame" );
}
 
void DrawXmlEmitter::visit( PolyPolyElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    elem.updateGeometry();
    /* note:
     *   aw recommends using 100dth of mm in all respects since the xml import
     *   (a) is buggy (see issue 37213)
     *   (b) is optimized for 100dth of mm and does not scale itself then,
     *       this does not gain us speed but makes for smaller rounding errors since
     *       the xml importer coordinates are integer based
     */
    for (sal_uInt32 i = 0; i< elem.PolyPoly.count(); i++)
    {
        basegfx::B2DPolygon b2dPolygon =  elem.PolyPoly.getB2DPolygon( i );
 
        for ( sal_uInt32 j = 0; j< b2dPolygon.count(); j++ )
        {
            basegfx::B2DPoint point;
            basegfx::B2DPoint nextPoint;
            point = b2dPolygon.getB2DPoint( j );
 
            basegfx::B2DPoint prevPoint = b2dPolygon.getPrevControlPoint( j ) ;
 
            point.setX( convPx2mmPrec2( point.getX() )*100.0 );
            point.setY( convPx2mmPrec2( point.getY() )*100.0 );
 
            if ( b2dPolygon.isPrevControlPointUsed( j ) )
            {
                prevPoint.setX( convPx2mmPrec2( prevPoint.getX() )*100.0 );
                prevPoint.setY( convPx2mmPrec2( prevPoint.getY() )*100.0 );
            }
 
            if ( b2dPolygon.isNextControlPointUsed( j ) )
            {
                nextPoint = b2dPolygon.getNextControlPoint( j ) ;
                nextPoint.setX( convPx2mmPrec2( nextPoint.getX() )*100.0 );
                nextPoint.setY( convPx2mmPrec2( nextPoint.getY() )*100.0 );
            }
 
            b2dPolygon.setB2DPoint( j, point );
 
            if ( b2dPolygon.isPrevControlPointUsed( j ) )
                b2dPolygon.setPrevControlPoint( j , prevPoint ) ;
 
            if ( b2dPolygon.isNextControlPointUsed( j ) )
                b2dPolygon.setNextControlPoint( j , nextPoint ) ;
        }
 
        elem.PolyPoly.setB2DPolygon( i, b2dPolygon );
    }
 
    PropertyMap aProps;
    // PDFIProcessor transforms geometrical objects, not images and text
    // so we need to tell fillFrameProps here that the transformation for
    // a PolyPolyElement was already applied (aside from translation)
    fillFrameProps( elem, aProps, m_rEmitContext, true );
    aProps[ "svg:viewBox" ] =
        "0 0 "
        + OUString::number( convPx2mmPrec2(elem.w)*100.0 )
        + " "
        + OUString::number( convPx2mmPrec2(elem.h)*100.0 );
    aProps[ "svg:d" ]       = basegfx::utils::exportToSvgD( elem.PolyPoly, false, true, false );
 
    m_rEmitContext.rEmitter.beginTag( "draw:path", aProps );
    m_rEmitContext.rEmitter.endTag( "draw:path" );
}
 
void DrawXmlEmitter::visit( ImageElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    PropertyMap aImageProps;
    m_rEmitContext.rEmitter.beginTag( "draw:image", aImageProps );
    m_rEmitContext.rEmitter.beginTag( "office:binary-data", PropertyMap() );
    m_rEmitContext.rImages.writeBase64EncodedStream( elem.Image, m_rEmitContext);
    m_rEmitContext.rEmitter.endTag( "office:binary-data" );
    m_rEmitContext.rEmitter.endTag( "draw:image" );
}
 
void DrawXmlEmitter::visit( PageElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&   )
{
    PropertyMap aPageProps;
    aPageProps[ "draw:master-page-name" ] = m_rEmitContext.rStyles.getStyleName( elem.StyleId );
 
    m_rEmitContext.rEmitter.beginTag("draw:page", aPageProps);
 
    if( m_rEmitContext.xStatusIndicator.is() )
        m_rEmitContext.xStatusIndicator->setValue( elem.PageNumber );
 
    auto this_it = elem.Children.begin();
    while( this_it != elem.Children.end() && this_it->get() != &elem )
    {
        (*this_it)->visitedBy( *this, this_it );
        ++this_it;
    }
 
    m_rEmitContext.rEmitter.endTag("draw:page");
}
 
void DrawXmlEmitter::visit( DocumentElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&)
{
    m_rEmitContext.rEmitter.beginTag( "office:body", PropertyMap() );
    m_rEmitContext.rEmitter.beginTag( m_bWriteDrawDocument ? "office:drawing" : "office:presentation",
                                      PropertyMap() );
 
    auto this_it = elem.Children.begin();
    while( this_it != elem.Children.end() && this_it->get() != &elem )
    {
        (*this_it)->visitedBy( *this, this_it );
        ++this_it;
    }
 
    m_rEmitContext.rEmitter.endTag( m_bWriteDrawDocument ? "office:drawing" : "office:presentation" );
    m_rEmitContext.rEmitter.endTag( "office:body" );
}
 
 
void DrawXmlOptimizer::visit( HyperlinkElement&, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
}
 
void DrawXmlOptimizer::visit( TextElement&, const std::list< std::unique_ptr<Element> >::const_iterator&)
{
}
 
void DrawXmlOptimizer::visit( FrameElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    elem.applyToChildren(*this);
}
 
void DrawXmlOptimizer::visit( ImageElement&, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
}
 
void DrawXmlOptimizer::visit( PolyPolyElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& elemIt )
{
    /* note: optimize two consecutive PolyPolyElements that
     *  have the same path but one of which is a stroke while
     *     the other is a fill
     */
    if( !elem.Parent )
        return;
 
    // find following PolyPolyElement in parent's children list
    if( elemIt == elem.Parent->Children.end() )
        return;
    auto next_it = elemIt;
    ++next_it;
    if( next_it == elem.Parent->Children.end() )
        return;
 
    PolyPolyElement* pNext = dynamic_cast<PolyPolyElement*>(next_it->get());
    // TODO(F2): this comparison fails for OOo-generated polygons with beziers.
    if( !pNext || pNext->PolyPoly != elem.PolyPoly )
        return;
 
    const GraphicsContext& rNextGC =
                   m_rProcessor.getGraphicsContext( pNext->GCId );
    const GraphicsContext& rThisGC =
                   m_rProcessor.getGraphicsContext( elem.GCId );
 
    if( !(rThisGC.BlendMode      == rNextGC.BlendMode &&
         rThisGC.Flatness       == rNextGC.Flatness &&
         rThisGC.Transformation == rNextGC.Transformation &&
         rThisGC.Clip           == rNextGC.Clip &&
         rThisGC.FillColor.Red  == rNextGC.FillColor.Red &&
         rThisGC.FillColor.Green== rNextGC.FillColor.Green &&
         rThisGC.FillColor.Blue == rNextGC.FillColor.Blue &&
         rThisGC.FillColor.Alpha== rNextGC.FillColor.Alpha &&
         pNext->Action          == PATH_STROKE &&
         (elem.Action == PATH_FILL || elem.Action == PATH_EOFILL)) )
        return;
 
    GraphicsContext aGC = rThisGC;
    aGC.LineJoin  = rNextGC.LineJoin;
    aGC.LineCap   = rNextGC.LineCap;
    aGC.LineWidth = rNextGC.LineWidth;
    aGC.MiterLimit= rNextGC.MiterLimit;
    aGC.DashArray = rNextGC.DashArray;
    aGC.LineColor = rNextGC.LineColor;
    elem.GCId = m_rProcessor.getGCId( aGC );
 
    elem.Action |= pNext->Action;
 
    elem.Children.splice( elem.Children.end(), pNext->Children );
    elem.Parent->Children.erase(next_it);
}
 
void DrawXmlOptimizer::visit( ParagraphElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    optimizeTextElements( elem );
 
    elem.applyToChildren(*this);
}
 
void DrawXmlOptimizer::visit( PageElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    if( m_rProcessor.getStatusIndicator().is() )
        m_rProcessor.getStatusIndicator()->setValue( elem.PageNumber );
 
    // resolve hyperlinks
    elem.resolveHyperlinks();
 
    elem.resolveFontStyles( m_rProcessor ); // underlines and such
 
    // FIXME: until hyperlinks and font effects are adjusted for
    // geometrical search handle them before sorting
    PDFIProcessor::sortElements( &elem );
 
    // find paragraphs in text
    ParagraphElement* pCurPara = nullptr;
    std::list< std::unique_ptr<Element> >::iterator page_element, next_page_element;
    next_page_element = elem.Children.begin();
    double fCurLineHeight = 0.0; // average height of text items in current para
    int nCurLineElements = 0; // number of line contributing elements in current para
    double line_left = elem.w, line_right = 0.0;
    double column_width = elem.w*0.75; // estimate text width
    // TODO: guess columns
    while( next_page_element != elem.Children.end() )
    {
        page_element = next_page_element++;
        ParagraphElement* pPagePara = dynamic_cast<ParagraphElement*>(page_element->get());
        if( pPagePara )
        {
            pCurPara = pPagePara;
            // adjust line height and text items
            fCurLineHeight = 0.0;
            nCurLineElements = 0;
            for( const auto& rxChild : pCurPara->Children )
            {
                TextElement* pTestText = rxChild->dynCastAsTextElement();
                if( pTestText )
                {
                    fCurLineHeight = (fCurLineHeight*double(nCurLineElements) + pTestText->h)/double(nCurLineElements+1);
                    nCurLineElements++;
                }
            }
            continue;
        }
 
        HyperlinkElement* pLink = dynamic_cast<HyperlinkElement*>(page_element->get());
        DrawElement* pDraw = dynamic_cast<DrawElement*>(page_element->get());
        if( ! pDraw && pLink && ! pLink->Children.empty() )
            pDraw = dynamic_cast<DrawElement*>(pLink->Children.front().get() );
        if( pDraw )
        {
            // insert small drawing objects as character, else leave them page bound
 
            bool bInsertToParagraph = false;
            // first check if this is either inside the paragraph
            if( pCurPara && pDraw->y < pCurPara->y + pCurPara->h )
            {
                if( pDraw->h < fCurLineHeight * 1.5 )
                {
                    bInsertToParagraph = true;
                    fCurLineHeight = (fCurLineHeight*double(nCurLineElements) + pDraw->h)/double(nCurLineElements+1);
                    nCurLineElements++;
                    // mark draw element as character
                    pDraw->isCharacter = true;
                }
            }
            // or perhaps the draw element begins a new paragraph
            else if( next_page_element != elem.Children.end() )
            {
                TextElement* pText = (*next_page_element)->dynCastAsTextElement();
                if( ! pText )
                {
                    ParagraphElement* pPara = dynamic_cast<ParagraphElement*>(next_page_element->get());
                    if( pPara && ! pPara->Children.empty() )
                        pText = pPara->Children.front()->dynCastAsTextElement();
                }
                if( pText && // check there is a text
                    pDraw->h < pText->h*1.5 && // and it is approx the same height
                    // and either upper or lower edge of pDraw is inside text's vertical range
                    ( ( pDraw->y >= pText->y && pDraw->y <= pText->y+pText->h ) ||
                      ( pDraw->y+pDraw->h >= pText->y && pDraw->y+pDraw->h <= pText->y+pText->h )
                      )
                    )
                {
                    bInsertToParagraph = true;
                    fCurLineHeight = pDraw->h;
                    nCurLineElements = 1;
                    line_left = pDraw->x;
                    line_right = pDraw->x + pDraw->w;
                    // begin a new paragraph
                    pCurPara = nullptr;
                    // mark draw element as character
                    pDraw->isCharacter = true;
                }
            }
 
            if( ! bInsertToParagraph )
            {
                pCurPara = nullptr;
                continue;
            }
        }
 
        TextElement* pText = (*page_element)->dynCastAsTextElement();
        if( ! pText && pLink && ! pLink->Children.empty() )
            pText = pLink->Children.front()->dynCastAsTextElement();
        if( pText )
        {
            Element* pGeo = pLink ? static_cast<Element*>(pLink) :
                                    static_cast<Element*>(pText);
            if( pCurPara )
            {
                // there was already a text element, check for a new paragraph
                if( nCurLineElements > 0 )
                {
                    // if the new text is significantly distant from the paragraph
                    // begin a new paragraph
                    if( pGeo->y > pCurPara->y + pCurPara->h + fCurLineHeight*0.5  )
                        pCurPara = nullptr; // insert new paragraph
                    else if( pGeo->y > (pCurPara->y+pCurPara->h - fCurLineHeight*0.05) )
                    {
                        // new paragraph if either the last line of the paragraph
                        // was significantly shorter than the paragraph as a whole
                        if( (line_right - line_left) < pCurPara->w*0.75 )
                            pCurPara = nullptr;
                        // or the last line was significantly smaller than the column width
                        else if( (line_right - line_left) < column_width*0.75 )
                            pCurPara = nullptr;
                    }
                }
 
 
            }
 
 
            // update line height/width
            if( pCurPara )
            {
                fCurLineHeight = (fCurLineHeight*double(nCurLineElements) + pGeo->h)/double(nCurLineElements+1);
                nCurLineElements++;
                if( pGeo->x < line_left )
                    line_left = pGeo->x;
                if( pGeo->x+pGeo->w > line_right )
                    line_right = pGeo->x+pGeo->w;
            }
            else
            {
                fCurLineHeight = pGeo->h;
                nCurLineElements = 1;
                line_left = pGeo->x;
                line_right = pGeo->x + pGeo->w;
            }
        }
 
 
        // move element to current paragraph
        if (! pCurPara )  // new paragraph, insert one
        {
            pCurPara = ElementFactory::createParagraphElement( nullptr );
            // set parent
            pCurPara->Parent = &elem;
            //insert new paragraph before current element
            page_element = elem.Children.insert( page_element, std::unique_ptr<Element>(pCurPara) );
            // forward iterator to current element again
            ++ page_element;
            // update next_element which is now invalid
            next_page_element = page_element;
            ++ next_page_element;
        }
        Element* pCurEle = page_element->get();
        Element::setParent( page_element, pCurPara );
        OSL_ENSURE( !pText || pCurEle == pText || pCurEle == pLink, "paragraph child list in disorder" );
        if( pText || pDraw )
            pCurPara->updateGeometryWith( pCurEle );
    }
 
    // process children
    elem.applyToChildren(*this);
}
 
static bool isSpaces(TextElement* pTextElem)
{
    for (sal_Int32 i = 0; i != pTextElem->Text.getLength(); ++i) {
        if (pTextElem->Text[i] != ' ') {
            return false;
        }
    }
    return true;
}
 
void DrawXmlOptimizer::optimizeTextElements(Element& rParent)
{
    if( rParent.Children.empty() ) // this should not happen
    {
        OSL_FAIL( "empty paragraph optimized" );
        return;
    }
 
    // concatenate child elements with same font id
    auto next = rParent.Children.begin();
    auto it = next++;
 
    while( next != rParent.Children.end() )
    {
        bool bConcat = false;
        TextElement* pCur = (*it)->dynCastAsTextElement();
 
        if( pCur )
        {
            TextElement* pNext = (*next)->dynCastAsTextElement();
            OUString str;
            bool bPara = strspn("ParagraphElement", typeid(rParent).name());
            ParagraphElement* pPara = dynamic_cast<ParagraphElement*>(&rParent);
            if (bPara && pPara && isComplex(GetBreakIterator(), pCur))
                pPara->bRtl = true;
            if( pNext )
            {
                const GraphicsContext& rCurGC = m_rProcessor.getGraphicsContext( pCur->GCId );
                const GraphicsContext& rNextGC = m_rProcessor.getGraphicsContext( pNext->GCId );
 
                // line and space optimization; works only in strictly horizontal mode
 
                // concatenate consecutive text elements unless there is a
                // font or text color change, leave a new span in that case
                if( (pCur->FontId == pNext->FontId || isSpaces(pNext)) &&
                    rCurGC.FillColor.Red == rNextGC.FillColor.Red &&
                    rCurGC.FillColor.Green == rNextGC.FillColor.Green &&
                    rCurGC.FillColor.Blue == rNextGC.FillColor.Blue &&
                    rCurGC.FillColor.Alpha == rNextGC.FillColor.Alpha
                    )
                {
                    pCur->updateGeometryWith( pNext );
                    if (pPara && pPara->bRtl)
                    {
                        // Tdf#152083: If RTL, reverse the text in pNext so that its correct order is
                        // restored when the combined text is reversed in DrawXmlEmitter::visit.
                        OUString tempStr;
                        bool bNeedReverse=false;
                        str = pNext->Text.toString();
                        for (sal_Int32 i=0; i < str.getLength(); i++)
                        {
                            if (str[i] == u' ')
                            {   // Space char (e.g. the space as in " م") needs special treatment.
                                //   First, append the space char to pCur.
                                pCur->Text.append(OUStringChar(str[i]));
                                //   Then, check whether the tmpStr needs reverse, if so then reverse and append.
                                if (bNeedReverse)
                                {
                                    tempStr = ::comphelper::string::reverseCodePoints(tempStr);
                                    pCur->Text.append(tempStr);
                                    tempStr = u"";
                                }
                                bNeedReverse = false;
                            }
                            else
                            {
                                tempStr += OUStringChar(str[i]);
                                bNeedReverse = true;
                            }
                        }
                        // Do the last append
                        if (bNeedReverse)
                        {
                            tempStr = ::comphelper::string::reverseCodePoints(tempStr);
                            pCur->Text.append(tempStr);
                        }
                        else
                        {
                            pCur->Text.append(tempStr);
                        }
                    }
                    else
                    {
                        // append text to current element directly without reverse
                        pCur->Text.append( pNext->Text );
                    }
 
                    if (bPara && pPara && isComplex(GetBreakIterator(), pCur))
                        pPara->bRtl = true;
                    // append eventual children to current element
                    // and clear children (else the children just
                    // appended to pCur would be destroyed)
                    pCur->Children.splice( pCur->Children.end(), pNext->Children );
                    // get rid of the now useless element
                    rParent.Children.erase( next );
                    bConcat = true;
                }
            }
        }
        else if( dynamic_cast<HyperlinkElement*>(it->get()) )
            optimizeTextElements( **it );
        if ( bConcat )
            next = it;
        else
            ++it;
        ++next;
    }
}
 
void DrawXmlOptimizer::visit( DocumentElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&)
{
    elem.applyToChildren(*this);
}
 
 
void DrawXmlFinalizer::visit( PolyPolyElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    // xxx TODO copied from DrawElement
    const GraphicsContext& rGC = m_rProcessor.getGraphicsContext(elem.GCId );
 
    PropertyMap aProps;
    aProps[ "style:family" ] = "graphic";
    aProps[ "style:parent-style-name" ] = "standard";
    // generate standard graphic style if necessary
    m_rStyleContainer.getStandardStyleId( "graphic" );
 
    PropertyMap aGCProps;
    if (elem.Action & PATH_STROKE)
    {
        double scale = GetAverageTransformationScale(rGC.Transformation);
        if (rGC.DashArray.size() < 2)
        {
            aGCProps[ "draw:stroke" ] = "solid";
        }
        else
        {
            PropertyMap props;
            FillDashStyleProps(props, rGC.DashArray, scale);
            StyleContainer::Style style("draw:stroke-dash", std::move(props));
 
            aGCProps[ "draw:stroke" ] = "dash";
            aGCProps[ "draw:stroke-dash" ] =
                m_rStyleContainer.getStyleName(
                m_rStyleContainer.getStyleId(style));
        }
 
        aGCProps[ "svg:stroke-color" ] = getColorString(rGC.LineColor);
        if (rGC.LineColor.Alpha != 1.0)
            aGCProps["svg:stroke-opacity"] = getPercentString(rGC.LineColor.Alpha * 100.0);
        aGCProps[ "svg:stroke-width" ] = convertPixelToUnitString(rGC.LineWidth * scale);
        aGCProps[ "draw:stroke-linejoin" ] = rGC.GetLineJoinString();
        aGCProps[ "svg:stroke-linecap" ] = rGC.GetLineCapString();
    }
    else
    {
        aGCProps[ "draw:stroke" ] = "none";
    }
 
    // TODO(F1): check whether stuff could be emulated by gradient/bitmap/hatch
    if( elem.Action & (PATH_FILL | PATH_EOFILL) )
    {
        aGCProps[ "draw:fill" ]   = "solid";
        aGCProps[ "draw:fill-color" ] = getColorString(rGC.FillColor);
        if (rGC.FillColor.Alpha != 1.0)
            aGCProps["draw:opacity"] = getPercentString(rGC.FillColor.Alpha * 100.0);
    }
    else
    {
        aGCProps[ "draw:fill" ] = "none";
    }
 
    StyleContainer::Style aStyle( "style:style", std::move(aProps) );
    StyleContainer::Style aSubStyle( "style:graphic-properties", std::move(aGCProps) );
    aStyle.SubStyles.push_back( &aSubStyle );
 
    elem.StyleId = m_rStyleContainer.getStyleId( aStyle );
}
 
void DrawXmlFinalizer::visit( HyperlinkElement&, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
}
 
static void SetFontsizeProperties(PropertyMap& props, double fontSize)
{
    OUString aFSize = OUString::number(fontSize * 72 / PDFI_OUTDEV_RESOLUTION) + "pt";
    props["fo:font-size"] = aFSize;
    props["style:font-size-asian"] = aFSize;
    props["style:font-size-complex"] = aFSize;
}
 
void DrawXmlFinalizer::visit( TextElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    const FontAttributes& rFont = m_rProcessor.getFont( elem.FontId );
    PropertyMap aProps;
    aProps[ "style:family" ] = "text";
 
    PropertyMap aFontProps;
 
    // family name
    // TODO: tdf#143095: use system font name rather than PSName
    SAL_INFO("sdext.pdfimport", "The font used in xml is: " << rFont.familyName);
    aFontProps[ "fo:font-family" ] = rFont.familyName;
    aFontProps[ "style:font-family-asian" ] = rFont.familyName;
    aFontProps[ "style:font-family-complex" ] = rFont.familyName;
 
    // bold
    aFontProps[ "fo:font-weight" ]         = rFont.fontWeight;
    aFontProps[ "style:font-weight-asian" ]   = rFont.fontWeight;
    aFontProps[ "style:font-weight-complex" ] = rFont.fontWeight;
 
    // italic
    if( rFont.isItalic )
    {
        aFontProps[ "fo:font-style" ]         = "italic";
        aFontProps[ "style:font-style-asian" ]   = "italic";
        aFontProps[ "style:font-style-complex" ] = "italic";
    }
 
    // underline
    if( rFont.isUnderline )
    {
        aFontProps[ "style:text-underline-style" ]  = "solid";
        aFontProps[ "style:text-underline-width" ]  = "auto";
        aFontProps[ "style:text-underline-color" ]  = "font-color";
    }
 
    // outline
    if( rFont.isOutline )
        aFontProps[ "style:text-outline" ]  = "true";
 
    // size
    SetFontsizeProperties(aFontProps, rFont.size);
 
    // color
    const GraphicsContext& rGC = m_rProcessor.getGraphicsContext( elem.GCId );
    aFontProps[ "fo:color" ] = getColorString( rFont.isOutline ? rGC.LineColor : rGC.FillColor );
 
    // scale
    double fRotate, fShearX;
    basegfx::B2DTuple aScale, aTranslation;
    rGC.Transformation.decompose(aScale, aTranslation, fRotate, fShearX);
    double textScale = 100 * aScale.getX() / aScale.getY();
    if (((textScale >= 1) && (textScale <= 99)) ||
        ((textScale >= 101) && (textScale <= 999)))
    {
        aFontProps[ "style:text-scale" ] = getPercentString(textScale);
    }
 
    StyleContainer::Style aStyle( "style:style", std::move(aProps) );
    StyleContainer::Style aSubStyle( "style:text-properties", std::move(aFontProps) );
    aStyle.SubStyles.push_back( &aSubStyle );
    elem.StyleId = m_rStyleContainer.getStyleId( aStyle );
}
 
void DrawXmlFinalizer::visit( ParagraphElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
 
    PropertyMap aProps;
    aProps[ "style:family" ] = "paragraph";
    // generate standard paragraph style if necessary
    m_rStyleContainer.getStandardStyleId( "paragraph" );
 
    PropertyMap aParProps;
 
    aParProps[ "fo:text-align"]                   = "start";
    if (elem.bRtl)
        aParProps[ "style:writing-mode"]                    = "rl-tb";
    else
        aParProps[ "style:writing-mode"]                    = "lr-tb";
 
    StyleContainer::Style aStyle( "style:style", std::move(aProps) );
    StyleContainer::Style aSubStyle( "style:paragraph-properties", std::move(aParProps) );
    aStyle.SubStyles.push_back( &aSubStyle );
 
    elem.StyleId = m_rStyleContainer.getStyleId( aStyle );
 
    elem.applyToChildren(*this);
}
 
void DrawXmlFinalizer::visit( FrameElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator&)
{
    PropertyMap props1;
    props1[ "style:family" ] = "graphic";
    props1[ "style:parent-style-name" ] = "standard";
    // generate standard graphic style if necessary
    m_rStyleContainer.getStandardStyleId( "graphic" );
 
    PropertyMap aGCProps;
 
    aGCProps[ "draw:stroke" ]                    = "none";
    aGCProps[ "draw:fill" ]                      = "none";
    aGCProps[ "draw:auto-grow-height" ]          = "true";
    aGCProps[ "draw:auto-grow-width" ]           = "true";
    aGCProps[ "draw:textarea-horizontal-align" ] = "left";
    aGCProps[ "draw:textarea-vertical-align" ]   = "top";
    aGCProps[ "fo:min-height"]                   = "0cm";
    aGCProps[ "fo:min-width"]                    = "0cm";
    aGCProps[ "fo:padding-top" ]                 = "0cm";
    aGCProps[ "fo:padding-left" ]                = "0cm";
    aGCProps[ "fo:padding-right" ]               = "0cm";
    aGCProps[ "fo:padding-bottom" ]              = "0cm";
 
    StyleContainer::Style style1( "style:style", std::move(props1) );
    StyleContainer::Style subStyle1( "style:graphic-properties", std::move(aGCProps) );
    style1.SubStyles.push_back(&subStyle1);
 
    elem.StyleId = m_rStyleContainer.getStyleId(style1);
 
    if (elem.IsForText)
    {
        PropertyMap props2;
        props2["style:family"] = "paragraph";
 
        PropertyMap textProps;
        SetFontsizeProperties(textProps, elem.FontSize);
 
        StyleContainer::Style style2("style:style", std::move(props2));
        StyleContainer::Style subStyle2("style:text-properties", std::move(textProps));
        style2.SubStyles.push_back(&subStyle2);
        elem.TextStyleId = m_rStyleContainer.getStyleId(style2);
    }
 
    elem.applyToChildren(*this);
}
 
void DrawXmlFinalizer::visit( ImageElement&, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
}
 
void DrawXmlFinalizer::visit( PageElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    if( m_rProcessor.getStatusIndicator().is() )
        m_rProcessor.getStatusIndicator()->setValue( elem.PageNumber );
 
    // transform from pixel to mm
    double page_width = convPx2mm( elem.w ), page_height = convPx2mm( elem.h );
 
    // calculate page margins out of the relevant children (paragraphs)
    elem.TopMargin = elem.h;
    elem.BottomMargin = 0;
    elem.LeftMargin = elem.w;
    elem.RightMargin = 0;
 
    for( const auto& rxChild : elem.Children )
    {
        if( rxChild->x < elem.LeftMargin )
            elem.LeftMargin = rxChild->x;
        if( rxChild->y < elem.TopMargin )
            elem.TopMargin = rxChild->y;
        if( rxChild->x + rxChild->w > elem.RightMargin )
            elem.RightMargin = (rxChild->x + rxChild->w);
        if( rxChild->y + rxChild->h > elem.BottomMargin )
            elem.BottomMargin = (rxChild->y + rxChild->h);
    }
 
    // transform margins to mm
    double left_margin     = convPx2mm( elem.LeftMargin );
    double right_margin    = convPx2mm( elem.RightMargin );
    double top_margin      = convPx2mm( elem.TopMargin );
    double bottom_margin   = convPx2mm( elem.BottomMargin );
 
    // round left/top margin to nearest mm
    left_margin     = rtl_math_round( left_margin, 0, rtl_math_RoundingMode_Floor );
    top_margin      = rtl_math_round( top_margin, 0, rtl_math_RoundingMode_Floor );
    // round (fuzzy) right/bottom margin to nearest cm
    right_margin    = rtl_math_round( right_margin, right_margin >= 10 ? -1 : 0, rtl_math_RoundingMode_Floor );
    bottom_margin   = rtl_math_round( bottom_margin, bottom_margin >= 10 ? -1 : 0, rtl_math_RoundingMode_Floor );
 
    // set reasonable default in case of way too large margins
    // e.g. no paragraph case
    if( left_margin > page_width/2.0 - 10 )
        left_margin = 10;
    if( right_margin > page_width/2.0 - 10 )
        right_margin = 10;
    if( top_margin > page_height/2.0 - 10 )
        top_margin = 10;
    if( bottom_margin > page_height/2.0 - 10 )
        bottom_margin = 10;
 
    // catch the weird cases
    if( left_margin < 0 )
        left_margin = 0;
    if( right_margin < 0 )
        right_margin = 0;
    if( top_margin < 0 )
        top_margin = 0;
    if( bottom_margin < 0 )
        bottom_margin = 0;
 
    // widely differing margins are unlikely to be correct
    if( right_margin > left_margin*1.5 )
        right_margin = left_margin;
 
    elem.LeftMargin      = convmm2Px( left_margin );
    elem.RightMargin     = convmm2Px( right_margin );
    elem.TopMargin       = convmm2Px( top_margin );
    elem.BottomMargin    = convmm2Px( bottom_margin );
 
    // get styles for paragraphs
    PropertyMap aPageProps;
    PropertyMap aPageLayoutProps;
    aPageLayoutProps[ "fo:margin-top" ]     =  unitMMString( top_margin );
    aPageLayoutProps[ "fo:margin-bottom" ]  =  unitMMString( bottom_margin );
    aPageLayoutProps[ "fo:margin-left" ]    =  unitMMString( left_margin );
    aPageLayoutProps[ "fo:margin-right" ]   =  unitMMString( right_margin );
    aPageLayoutProps[ "fo:page-width" ]     =  unitMMString( page_width );
    aPageLayoutProps[ "fo:page-height" ]    =  unitMMString( page_height );
    aPageLayoutProps[ "style:print-orientation" ]= elem.w < elem.h ? std::u16string_view(u"portrait") : std::u16string_view(u"landscape");
    aPageLayoutProps[ "style:writing-mode" ]= "lr-tb";
 
    StyleContainer::Style aStyle( "style:page-layout", std::move(aPageProps));
    StyleContainer::Style aSubStyle( "style:page-layout-properties", std::move(aPageLayoutProps));
    aStyle.SubStyles.push_back(&aSubStyle);
    sal_Int32 nPageStyle = m_rStyleContainer.impl_getStyleId( aStyle, false );
 
    // create master page
    OUString aMasterPageLayoutName = m_rStyleContainer.getStyleName( nPageStyle );
    aPageProps[ "style:page-layout-name" ] = aMasterPageLayoutName;
 
    StyleContainer::Style aMPStyle( "style:master-page", std::move(aPageProps));
 
    elem.StyleId = m_rStyleContainer.impl_getStyleId( aMPStyle,false );
 
    // create styles for children
    elem.applyToChildren(*this);
}
 
void DrawXmlFinalizer::visit( DocumentElement& elem, const std::list< std::unique_ptr<Element> >::const_iterator& )
{
    elem.applyToChildren(*this);
}
 
}
 
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */