/* -*- 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/types.h>

#include <basegfx/matrix/b2dhommatrix.hxx>

#include <basegfx/polygon/b2dlinegeometry.hxx>

#include <vcl/rendercontext/AntialiasingFlags.hxx>

#include <vcl/metaact.hxx>

#include <vcl/virdev.hxx>

#include <salgdi.hxx>

#include <cassert>

void OutputDevice::DrawPolyLine( const tools::Polygon& rPoly )

{

    assert(!is_double_buffered_window());

    if( mpMetaFile )

        mpMetaFile->AddAction( new MetaPolyLineAction( rPoly ) );

    sal_uInt16 nPoints = rPoly.GetSize();

    if ( !IsDeviceOutputNecessary() || !mbLineColor || (nPoints < 2) || ImplIsRecordLayout() )

        return;

    // we need a graphics

    if ( !mpGraphics && !AcquireGraphics() )

        return;

    assert(mpGraphics);

    if ( mbInitClipRegion )

        InitClipRegion();

    if ( mbOutputClipped )

        return;

    if ( mbInitLineColor )

        InitLineColor();

    // use b2dpolygon drawing if possible

    if(DrawPolyLineDirectInternal(

        basegfx::B2DHomMatrix(),

        rPoly.getB2DPolygon()))

    {

        return;

    }

    const basegfx::B2DPolygon aB2DPolyLine(rPoly.getB2DPolygon());

    const basegfx::B2DHomMatrix aTransform(ImplGetDeviceTransformation());

    const bool bPixelSnapHairline(mnAntialiasing & AntialiasingFlags::PixelSnapHairline);

    bool bDrawn = mpGraphics->DrawPolyLine(

        aTransform,

        aB2DPolyLine,

        0.0,

        0.0, // tdf#124848 hairline

        nullptr, // MM01

        basegfx::B2DLineJoin::NONE,

        css::drawing::LineCap_BUTT,

        basegfx::deg2rad(15.0) /*default fMiterMinimumAngle, not used*/,

        bPixelSnapHairline,

        *this);

    if(!bDrawn)

    {

        tools::Polygon aPoly = ImplLogicToDevicePixel( rPoly );

        Point* pPtAry = aPoly.GetPointAry();

        // #100127# Forward beziers to sal, if any

        if( aPoly.HasFlags() )

        {

            const PolyFlags* pFlgAry = aPoly.GetConstFlagAry();

            if( !mpGraphics->DrawPolyLineBezier( nPoints, pPtAry, pFlgAry, *this ) )

            {

                aPoly = tools::Polygon::SubdivideBezier(aPoly);

                pPtAry = aPoly.GetPointAry();

                mpGraphics->DrawPolyLine( aPoly.GetSize(), pPtAry, *this );

            }

        }

        else

        {

            mpGraphics->DrawPolyLine( nPoints, pPtAry, *this );

        }

    }

}

void OutputDevice::DrawPolyLine( const tools::Polygon& rPoly, const LineInfo& rLineInfo )

{

    assert(!is_double_buffered_window());

    if ( rLineInfo.IsDefault() )

    {

        DrawPolyLine( rPoly );

        return;

    }

    if (IsDeviceOutputNecessary())

    {

        auto eLineStyle = rLineInfo.GetStyle();

        switch (eLineStyle)

        {

            case LineStyle::NONE:

            case LineStyle::Dash:

                // use drawPolyLine for these

                break;

            case LineStyle::Solid:

                // #i101491# Try direct Fallback to B2D-Version of DrawPolyLine

                DrawPolyLine(

                    rPoly.getB2DPolygon(),

                    rLineInfo.GetWidth(),

                    rLineInfo.GetLineJoin(),

                    rLineInfo.GetLineCap(),

                    basegfx::deg2rad(15.0) /* default fMiterMinimumAngle, value not available in LineInfo */);

                return;

            default:

                SAL_WARN("vcl.gdi", "Unknown LineStyle: " << static_cast<int>(eLineStyle));

                return;

        }

    }

    if ( mpMetaFile )

        mpMetaFile->AddAction( new MetaPolyLineAction( rPoly, rLineInfo ) );

    drawPolyLine(rPoly, rLineInfo);

}

void OutputDevice::DrawPolyLine( const basegfx::B2DPolygon& rB2DPolygon,

                                 double fLineWidth,

                                 basegfx::B2DLineJoin eLineJoin,

                                 css::drawing::LineCap eLineCap,

                                 double fMiterMinimumAngle)

{

    assert(!is_double_buffered_window());

    if( mpMetaFile )

    {

        LineInfo aLineInfo;

        if( fLineWidth != 0.0 )

            aLineInfo.SetWidth( fLineWidth );

        aLineInfo.SetLineJoin(eLineJoin);

        aLineInfo.SetLineCap(eLineCap);

        tools::Polygon aToolsPolygon( rB2DPolygon );

        mpMetaFile->AddAction( new MetaPolyLineAction( std::move(aToolsPolygon), std::move(aLineInfo) ) );

    }

    // Do not paint empty PolyPolygons

    if(!rB2DPolygon.count() || !IsDeviceOutputNecessary())

        return;

    // we need a graphics

    if( !mpGraphics && !AcquireGraphics() )

        return;

    assert(mpGraphics);

    if( mbInitClipRegion )

        InitClipRegion();

    if( mbOutputClipped )

        return;

    if( mbInitLineColor )

        InitLineColor();

    // use b2dpolygon drawing if possible

    if(DrawPolyLineDirectInternal(

        basegfx::B2DHomMatrix(),

        rB2DPolygon,

        fLineWidth,

        0.0,

        nullptr, // MM01

        eLineJoin,

        eLineCap,

        fMiterMinimumAngle))

    {

        return;

    }

    // #i101491#

    // no output yet; fallback to geometry decomposition and use filled polygon paint

    // when line is fat and not too complex. ImplDrawPolyPolygonWithB2DPolyPolygon

    // will do internal needed AA checks etc.

    if(fLineWidth >= 2.5 &&

       rB2DPolygon.count() &&

       rB2DPolygon.count() <= 1000)

    {

        const double fHalfLineWidth((fLineWidth * 0.5) + 0.5);

        const basegfx::B2DPolyPolygon aAreaPolyPolygon(

                basegfx::utils::createAreaGeometry( rB2DPolygon,

                                                    fHalfLineWidth,

                                                    eLineJoin,

                                                    eLineCap,

                                                    fMiterMinimumAngle));

        const Color aOldLineColor(maLineColor);

        const Color aOldFillColor(maFillColor);

        SetLineColor();

        InitLineColor();

        SetFillColor(aOldLineColor);

        InitFillColor();

        // draw using a loop; else the topology will paint a PolyPolygon

        for(auto const& rPolygon : aAreaPolyPolygon)

        {

            ImplDrawPolyPolygonWithB2DPolyPolygon(

                basegfx::B2DPolyPolygon(rPolygon));

        }

        SetLineColor(aOldLineColor);

        InitLineColor();

        SetFillColor(aOldFillColor);

        InitFillColor();

        // when AA it is necessary to also paint the filled polygon's outline

        // to avoid optical gaps

        for(auto const& rPolygon : aAreaPolyPolygon)

        {

            (void)DrawPolyLineDirectInternal(

                basegfx::B2DHomMatrix(),

                rPolygon);

        }

    }

    else

    {

        // fallback to old polygon drawing if needed

        const tools::Polygon aToolsPolygon( rB2DPolygon );

        LineInfo aLineInfo;

        if( fLineWidth != 0.0 )

            aLineInfo.SetWidth( fLineWidth );

        drawPolyLine( aToolsPolygon, aLineInfo );

    }

}

void OutputDevice::drawPolyLine(const tools::Polygon& rPoly, const LineInfo& rLineInfo)

{

    sal_uInt16 nPoints(rPoly.GetSize());

    if ( !IsDeviceOutputNecessary() || !mbLineColor || ( nPoints < 2 ) || ( LineStyle::NONE == rLineInfo.GetStyle() ) || ImplIsRecordLayout() )

        return;

    // we need a graphics

    if ( !mpGraphics && !AcquireGraphics() )

        return;

    assert(mpGraphics);

    if ( mbInitClipRegion )

        InitClipRegion();

    if ( mbOutputClipped )

        return;

    if ( mbInitLineColor )

        InitLineColor();

    const LineInfo aInfo( ImplLogicToDevicePixel( rLineInfo ) );

    const bool bDashUsed(LineStyle::Dash == aInfo.GetStyle());

    const bool bLineWidthUsed(aInfo.GetWidth() > 1);

    if (bDashUsed || bLineWidthUsed)

    {

        basegfx::B2DPolygon aPoly = ImplLogicToDevicePixel(rPoly.getB2DPolygon());

        drawLine(basegfx::B2DPolyPolygon(aPoly), aInfo);

    }

    else

    {

        tools::Polygon aPoly = ImplLogicToDevicePixel(rPoly);

        // #100127# the subdivision HAS to be done here since only a pointer

        // to an array of points is given to the DrawPolyLine method, there is

        // NO way to find out there that it's a curve.

        if( aPoly.HasFlags() )

        {

            aPoly = tools::Polygon::SubdivideBezier( aPoly );

            nPoints = aPoly.GetSize();

        }

        mpGraphics->DrawPolyLine(nPoints, aPoly.GetPointAry(), *this);

    }

}

bool OutputDevice::DrawPolyLineDirect(

    const basegfx::B2DHomMatrix& rObjectTransform,

    const basegfx::B2DPolygon& rB2DPolygon,

    double fLineWidth,

    double fTransparency,

    const std::vector< double >* pStroke, // MM01

    basegfx::B2DLineJoin eLineJoin,

    css::drawing::LineCap eLineCap,

    double fMiterMinimumAngle)

{

    if(DrawPolyLineDirectInternal(rObjectTransform, rB2DPolygon, fLineWidth, fTransparency,

        pStroke, eLineJoin, eLineCap, fMiterMinimumAngle))

    {

        // Worked, add metafile action (if recorded). This is done only here,

        // because this function is public, other OutDev functions already add metafile

        // actions, so they call the internal function directly.

        if( mpMetaFile )

        {

            LineInfo aLineInfo;

            if( fLineWidth != 0.0 )

                aLineInfo.SetWidth( fLineWidth );

            // Transport known information, might be needed

            aLineInfo.SetLineJoin(eLineJoin);

            aLineInfo.SetLineCap(eLineCap);

            // MiterMinimumAngle does not exist yet in LineInfo

            tools::Polygon aToolsPolygon( rB2DPolygon );

            mpMetaFile->AddAction( new MetaPolyLineAction( std::move(aToolsPolygon), std::move(aLineInfo) ) );

        }

        return true;

    }

    return false;

}

bool OutputDevice::DrawPolyLineDirectInternal(

    const basegfx::B2DHomMatrix& rObjectTransform,

    const basegfx::B2DPolygon& rB2DPolygon,

    double fLineWidth,

    double fTransparency,

    const std::vector< double >* pStroke, // MM01

    basegfx::B2DLineJoin eLineJoin,

    css::drawing::LineCap eLineCap,

    double fMiterMinimumAngle)

{

    assert(!is_double_buffered_window());

    // AW: Do NOT paint empty PolyPolygons

    if(!rB2DPolygon.count())

        return true;

    // we need a graphics

    if( !mpGraphics && !AcquireGraphics() )

        return false;

    assert(mpGraphics);

    if( mbInitClipRegion )

        InitClipRegion();

    if( mbOutputClipped )

        return true;

    if( mbInitLineColor )

        InitLineColor();

    const bool bTryB2d(RasterOp::OverPaint == GetRasterOp() && IsLineColor());

    if(bTryB2d)

    {

        // combine rObjectTransform with WorldToDevice

        const basegfx::B2DHomMatrix aTransform(ImplGetDeviceTransformation() * rObjectTransform);

        const bool bPixelSnapHairline((mnAntialiasing & AntialiasingFlags::PixelSnapHairline) && rB2DPolygon.count() < 1000);

        // draw the polyline

        return mpGraphics->DrawPolyLine(

            aTransform,

            rB2DPolygon,

            fTransparency,

            fLineWidth, // tdf#124848 use LineWidth direct, do not try to solve for zero-case (aka hairline)

            pStroke, // MM01

            eLineJoin,

            eLineCap,

            fMiterMinimumAngle,

            bPixelSnapHairline,

            *this);

    }

    return false;

}

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