/* -*- 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 <tools/poly.hxx>

#include <vcl/gradient.hxx>

#include <vcl/metaact.hxx>

#include <vcl/rendercontext/DrawModeFlags.hxx>

#include <vcl/settings.hxx>

#include <vcl/virdev.hxx>

#include <vcl/window.hxx>

#include <salgdi.hxx>

#include <cassert>

#include <memory>

#define GRADIENT_DEFAULT_STEPCOUNT  0

void OutputDevice::DrawGradient( const tools::Rectangle& rRect,

                                 const Gradient& rGradient )

{

    assert(!is_double_buffered_window());

    // Convert rectangle to a tools::PolyPolygon by first converting to a Polygon

    tools::Polygon aPolygon ( rRect );

    tools::PolyPolygon aPolyPoly ( aPolygon );

    DrawGradient ( aPolyPoly, rGradient );

}

void OutputDevice::DrawGradient( const tools::PolyPolygon& rPolyPoly,

                                 const Gradient& rGradient )

{

    assert(!is_double_buffered_window());

    if (mbInitClipRegion)

        InitClipRegion();

    // don't return on mbOutputClipped here, as we may need to draw the clipped metafile, even if the output is clipped

    if (!rPolyPoly.Count() || !rPolyPoly[0].GetSize())

        return;

    if ( mnDrawMode & ( DrawModeFlags::WhiteGradient | DrawModeFlags::SettingsGradient) )

    {

        Color aColor = GetSingleColorGradientFill();

        auto popIt = ScopedPush(vcl::PushFlags::LINECOLOR | vcl::PushFlags::FILLCOLOR);

        SetLineColor( aColor );

        SetFillColor( aColor );

        DrawPolyPolygon( rPolyPoly );

        return;

    }

    Gradient aGradient( rGradient );

    if ( mnDrawMode & DrawModeFlags::GrayGradient )

        aGradient.MakeGrayscale();

    DrawGradientToMetafile( rPolyPoly, rGradient );

    if( !IsDeviceOutputNecessary() || ImplIsRecordLayout() )

        return;

    // Clip and then draw the gradient

    if (tools::Rectangle(PixelToLogic(Point()), GetOutputSize()).IsEmpty())

        return;

    const tools::Rectangle aBoundRect( rPolyPoly.GetBoundRect() );

    // convert rectangle to pixels

    tools::Rectangle aRect(LogicToDevicePixel(aBoundRect));

    aRect.Normalize();

    // do nothing if the rectangle is empty

    if (aRect.IsEmpty())

        return;

    tools::PolyPolygon aClixPolyPoly( ImplLogicToDevicePixel( rPolyPoly ) );

    bool bDrawn = false;

    if( !mpGraphics && !AcquireGraphics() )

        return;

    // secure clip region

    auto popIt = ScopedPush(vcl::PushFlags::CLIPREGION);

    IntersectClipRegion( aBoundRect );

    if (mbInitClipRegion)

        InitClipRegion();

    // try to draw gradient natively

    if (!mbOutputClipped)

        bDrawn = mpGraphics->DrawGradient( aClixPolyPoly, aGradient, *this );

    if (bDrawn || mbOutputClipped)

        return;

    // draw gradients without border

    if( mbLineColor || mbInitLineColor )

    {

        mpGraphics->SetLineColor();

        mbInitLineColor = true;

    }

    mbInitFillColor = true;

    // calculate step count if necessary

    if ( !aGradient.GetSteps() )

        aGradient.SetSteps( GRADIENT_DEFAULT_STEPCOUNT );

    if ( rPolyPoly.IsRect() )

    {

        // because we draw with no border line, we have to expand gradient

        // rect to avoid missing lines on the right and bottom edge

        aRect.AdjustLeft( -1 );

        aRect.AdjustTop( -1 );

        aRect.AdjustRight( 1 );

        aRect.AdjustBottom( 1 );

    }

    // if the clipping polypolygon is a rectangle, then it's the same size as the bounding of the

    // polypolygon, so pass in a NULL for the clipping parameter

    if( aGradient.GetStyle() == css::awt::GradientStyle_LINEAR || rGradient.GetStyle() == css::awt::GradientStyle_AXIAL )

        DrawLinearGradient( aRect, aGradient, aClixPolyPoly.IsRect() ? nullptr : &aClixPolyPoly );

    else

        DrawComplexGradient( aRect, aGradient, aClixPolyPoly.IsRect() ? nullptr : &aClixPolyPoly );

}

void OutputDevice::ClipAndDrawGradientMetafile ( const Gradient &rGradient, const tools::PolyPolygon &rPolyPoly )

{

    const bool  bOldOutput = IsOutputEnabled();

    EnableOutput( false );

    Push( vcl::PushFlags::CLIPREGION );

    SetClipRegion( vcl::Region( rPolyPoly ) );

    DrawGradient( rPolyPoly.GetBoundRect(), rGradient );

    Pop();

    EnableOutput( bOldOutput );

}

void OutputDevice::DrawGradientToMetafile ( const tools::PolyPolygon& rPolyPoly,

                                            const Gradient& rGradient )

{

    assert(!is_double_buffered_window());

    if ( !mpMetaFile )

        return;

    if ( !(rPolyPoly.Count() && rPolyPoly[ 0 ].GetSize()) )

        return;

    const tools::Rectangle aBoundRect( rPolyPoly.GetBoundRect() );

    if (aBoundRect.IsEmpty())

        return;

    Gradient aGradient( rGradient );

    if (mnDrawMode & DrawModeFlags::GrayGradient)

        aGradient.MakeGrayscale();

    if ( rPolyPoly.IsRect() )

    {

        mpMetaFile->AddAction( new MetaGradientAction( aBoundRect, std::move(aGradient) ) );

    }

    else

    {

        mpMetaFile->AddAction( new MetaCommentAction( "XGRAD_SEQ_BEGIN"_ostr ) );

        mpMetaFile->AddAction( new MetaGradientExAction( rPolyPoly, rGradient ) );

        ClipAndDrawGradientMetafile ( rGradient, rPolyPoly );

        mpMetaFile->AddAction( new MetaCommentAction( "XGRAD_SEQ_END"_ostr ) );

    }

}

namespace

{

    sal_uInt8 GetGradientColorValue( tools::Long nValue )

    {

        if ( nValue < 0 )

            return 0;

        else if ( nValue > 0xFF )

            return 0xFF;

        else

            return static_cast<sal_uInt8>(nValue);

    }

}

void OutputDevice::DrawLinearGradient( const tools::Rectangle& rRect,

                                       const Gradient& rGradient,

                                       const tools::PolyPolygon* pClixPolyPoly )

{

    assert(!is_double_buffered_window());

    // get BoundRect of rotated rectangle

    tools::Rectangle aRect;

    Point     aCenter;

    Degree10  nAngle = rGradient.GetAngle() % 3600_deg10;

    rGradient.GetBoundRect( rRect, aRect, aCenter );

    bool bLinear = (rGradient.GetStyle() == css::awt::GradientStyle_LINEAR);

    double fBorder = rGradient.GetBorder() * aRect.GetHeight() / 100.0;

    if ( !bLinear )

    {

        fBorder /= 2.0;

    }

    tools::Rectangle aMirrorRect = aRect; // used in style axial

    aMirrorRect.SetTop( ( aRect.Top() + aRect.Bottom() ) / 2 );

    if ( !bLinear )

    {

        aRect.SetBottom( aMirrorRect.Top() );

    }

    // colour-intensities of start- and finish; change if needed

    tools::Long    nFactor;

    Color   aStartCol   = rGradient.GetStartColor();

    Color   aEndCol     = rGradient.GetEndColor();

    tools::Long    nStartRed   = aStartCol.GetRed();

    tools::Long    nStartGreen = aStartCol.GetGreen();

    tools::Long    nStartBlue  = aStartCol.GetBlue();

    tools::Long    nEndRed     = aEndCol.GetRed();

    tools::Long    nEndGreen   = aEndCol.GetGreen();

    tools::Long    nEndBlue    = aEndCol.GetBlue();

    nFactor     = rGradient.GetStartIntensity();

    nStartRed   = (nStartRed   * nFactor) / 100;

    nStartGreen = (nStartGreen * nFactor) / 100;

    nStartBlue  = (nStartBlue  * nFactor) / 100;

    nFactor     = rGradient.GetEndIntensity();

    nEndRed     = (nEndRed   * nFactor) / 100;

    nEndGreen   = (nEndGreen * nFactor) / 100;

    nEndBlue    = (nEndBlue  * nFactor) / 100;

    // gradient style axial has exchanged start and end colors

    if ( !bLinear)

    {

        std::swap( nStartRed, nEndRed );

        std::swap( nStartGreen, nEndGreen );

        std::swap( nStartBlue, nEndBlue );

    }

    sal_uInt8   nRed;

    sal_uInt8   nGreen;

    sal_uInt8   nBlue;

    // Create border

    tools::Rectangle aBorderRect = aRect;

    tools::Polygon aPoly( 4 );

    if (fBorder > 0.0)

    {

        nRed        = static_cast<sal_uInt8>(nStartRed);

        nGreen      = static_cast<sal_uInt8>(nStartGreen);

        nBlue       = static_cast<sal_uInt8>(nStartBlue);

        mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) );

        aBorderRect.SetBottom( static_cast<tools::Long>( aBorderRect.Top() + fBorder ) );

        aRect.SetTop( aBorderRect.Bottom() );

        aPoly[0] = aBorderRect.TopLeft();

        aPoly[1] = aBorderRect.TopRight();

        aPoly[2] = aBorderRect.BottomRight();

        aPoly[3] = aBorderRect.BottomLeft();

        aPoly.Rotate( aCenter, nAngle );

        ImplDrawPolygon( aPoly, pClixPolyPoly );

        if ( !bLinear)

        {

            aBorderRect = aMirrorRect;

            aBorderRect.SetTop( static_cast<tools::Long>( aBorderRect.Bottom() - fBorder ) );

            aMirrorRect.SetBottom( aBorderRect.Top() );

            aPoly[0] = aBorderRect.TopLeft();

            aPoly[1] = aBorderRect.TopRight();

            aPoly[2] = aBorderRect.BottomRight();

            aPoly[3] = aBorderRect.BottomLeft();

            aPoly.Rotate( aCenter, nAngle );

            ImplDrawPolygon( aPoly, pClixPolyPoly );

        }

    }

    // calculate step count

    tools::Long nStepCount = GetGradientSteps(rGradient, aRect);

    // minimal three steps and maximal as max color steps

    tools::Long   nAbsRedSteps   = std::abs( nEndRed   - nStartRed );

    tools::Long   nAbsGreenSteps = std::abs( nEndGreen - nStartGreen );

    tools::Long   nAbsBlueSteps  = std::abs( nEndBlue  - nStartBlue );

    tools::Long   nMaxColorSteps = std::max( nAbsRedSteps , nAbsGreenSteps );

    nMaxColorSteps = std::max( nMaxColorSteps, nAbsBlueSteps );

    tools::Long nSteps = std::min( nStepCount, nMaxColorSteps );

    if ( nSteps < 3)

    {

        nSteps = 3;

    }

    double fScanInc = static_cast<double>(aRect.GetHeight()) / static_cast<double>(nSteps);

    double fGradientLine = static_cast<double>(aRect.Top());

    double fMirrorGradientLine = static_cast<double>(aMirrorRect.Bottom());

    const double fStepsMinus1 = static_cast<double>(nSteps) - 1.0;

    if ( !bLinear)

    {

        nSteps -= 1; // draw middle polygons as one polygon after loop to avoid gap

    }

    for ( tools::Long i = 0; i < nSteps; i++ )

    {

        // linear interpolation of color

        const double fAlpha = static_cast<double>(i) / fStepsMinus1;

        double fTempColor = static_cast<double>(nStartRed) * (1.0-fAlpha) + static_cast<double>(nEndRed) * fAlpha;

        nRed = GetGradientColorValue(static_cast<tools::Long>(fTempColor));

        fTempColor = static_cast<double>(nStartGreen) * (1.0-fAlpha) + static_cast<double>(nEndGreen) * fAlpha;

        nGreen = GetGradientColorValue(static_cast<tools::Long>(fTempColor));

        fTempColor = static_cast<double>(nStartBlue) * (1.0-fAlpha) + static_cast<double>(nEndBlue) * fAlpha;

        nBlue = GetGradientColorValue(static_cast<tools::Long>(fTempColor));

        mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) );

        // Polygon for this color step

        aRect.SetTop( static_cast<tools::Long>( fGradientLine + static_cast<double>(i) * fScanInc ) );

        aRect.SetBottom( static_cast<tools::Long>( fGradientLine + ( static_cast<double>(i) + 1.0 ) * fScanInc ) );

        aPoly[0] = aRect.TopLeft();

        aPoly[1] = aRect.TopRight();

        aPoly[2] = aRect.BottomRight();

        aPoly[3] = aRect.BottomLeft();

        aPoly.Rotate( aCenter, nAngle );

        ImplDrawPolygon( aPoly, pClixPolyPoly );

        if ( !bLinear )

        {

            aMirrorRect.SetBottom( static_cast<tools::Long>( fMirrorGradientLine - static_cast<double>(i) * fScanInc ) );

            aMirrorRect.SetTop( static_cast<tools::Long>( fMirrorGradientLine - (static_cast<double>(i) + 1.0)* fScanInc ) );

            aPoly[0] = aMirrorRect.TopLeft();

            aPoly[1] = aMirrorRect.TopRight();

            aPoly[2] = aMirrorRect.BottomRight();

            aPoly[3] = aMirrorRect.BottomLeft();

            aPoly.Rotate( aCenter, nAngle );

            ImplDrawPolygon( aPoly, pClixPolyPoly );

        }

    }

    if ( bLinear)

        return;

    // draw middle polygon with end color

    nRed = GetGradientColorValue(nEndRed);

    nGreen = GetGradientColorValue(nEndGreen);

    nBlue = GetGradientColorValue(nEndBlue);

    mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) );

    aRect.SetTop( static_cast<tools::Long>( fGradientLine + static_cast<double>(nSteps) * fScanInc ) );

    aRect.SetBottom( static_cast<tools::Long>( fMirrorGradientLine - static_cast<double>(nSteps) * fScanInc ) );

    aPoly[0] = aRect.TopLeft();

    aPoly[1] = aRect.TopRight();

    aPoly[2] = aRect.BottomRight();

    aPoly[3] = aRect.BottomLeft();

    aPoly.Rotate( aCenter, nAngle );

    ImplDrawPolygon( aPoly, pClixPolyPoly );

}

bool OutputDevice::is_double_buffered_window() const

{

    auto pOwnerWindow = GetOwnerWindow();

    return pOwnerWindow && pOwnerWindow->SupportsDoubleBuffering();

}

void OutputDevice::DrawComplexGradient( const tools::Rectangle& rRect,

                                        const Gradient& rGradient,

                                        const tools::PolyPolygon* pClixPolyPoly )

{

    assert(!is_double_buffered_window());

    // Determine if we output via Polygon or PolyPolygon

    // For all rasteroperations other than Overpaint always use PolyPolygon,

    // as we will get wrong results if we output multiple times on top of each other.

    // Also for printers always use PolyPolygon, as not all printers

    // can print polygons on top of each other.

    std::optional<tools::PolyPolygon> xPolyPoly;

    tools::Rectangle       aRect;

    Point           aCenter;

    Color           aStartCol( rGradient.GetStartColor() );

    Color           aEndCol( rGradient.GetEndColor() );

    tools::Long            nStartRed = ( static_cast<tools::Long>(aStartCol.GetRed()) * rGradient.GetStartIntensity() ) / 100;

    tools::Long            nStartGreen = ( static_cast<tools::Long>(aStartCol.GetGreen()) * rGradient.GetStartIntensity() ) / 100;

    tools::Long            nStartBlue = ( static_cast<tools::Long>(aStartCol.GetBlue()) * rGradient.GetStartIntensity() ) / 100;

    tools::Long            nEndRed = ( static_cast<tools::Long>(aEndCol.GetRed()) * rGradient.GetEndIntensity() ) / 100;

    tools::Long            nEndGreen = ( static_cast<tools::Long>(aEndCol.GetGreen()) * rGradient.GetEndIntensity() ) / 100;

    tools::Long            nEndBlue = ( static_cast<tools::Long>(aEndCol.GetBlue()) * rGradient.GetEndIntensity() ) / 100;

    tools::Long            nRedSteps = nEndRed - nStartRed;

    tools::Long            nGreenSteps = nEndGreen - nStartGreen;

    tools::Long            nBlueSteps = nEndBlue   - nStartBlue;

    Degree10       nAngle = rGradient.GetAngle() % 3600_deg10;

    rGradient.GetBoundRect( rRect, aRect, aCenter );

    if ( UsePolyPolygonForComplexGradient() )

        xPolyPoly = tools::PolyPolygon( 2 );

    tools::Long nStepCount = GetGradientSteps(rGradient, rRect);

    // at least three steps and at most the number of colour differences

    tools::Long nSteps = std::max( nStepCount, tools::Long(2) );

    tools::Long nCalcSteps  = std::abs( nRedSteps );

    tools::Long nTempSteps = std::abs( nGreenSteps );

    if ( nTempSteps > nCalcSteps )

        nCalcSteps = nTempSteps;

    nTempSteps = std::abs( nBlueSteps );

    if ( nTempSteps > nCalcSteps )

        nCalcSteps = nTempSteps;

    if ( nCalcSteps < nSteps )

        nSteps = nCalcSteps;

    if ( !nSteps )

        nSteps = 1;

    // determine output limits and stepsizes for all directions

    tools::Polygon aPoly;

    double  fScanLeft = aRect.Left();

    double  fScanTop = aRect.Top();

    double  fScanRight = aRect.Right();

    double  fScanBottom = aRect.Bottom();

    double fScanIncX = static_cast<double>(aRect.GetWidth()) / static_cast<double>(nSteps) * 0.5;

    double fScanIncY = static_cast<double>(aRect.GetHeight()) / static_cast<double>(nSteps) * 0.5;

    // all gradients are rendered as nested rectangles which shrink

    // equally in each dimension - except for 'square' gradients

    // which shrink to a central vertex but are not per-se square.

    if( rGradient.GetStyle() != css::awt::GradientStyle_SQUARE )

    {

        fScanIncY = std::min( fScanIncY, fScanIncX );

        fScanIncX = fScanIncY;

    }

    sal_uInt8   nRed = static_cast<sal_uInt8>(nStartRed), nGreen = static_cast<sal_uInt8>(nStartGreen), nBlue = static_cast<sal_uInt8>(nStartBlue);

    bool    bPaintLastPolygon( false ); // #107349# Paint last polygon only if loop has generated any output

    mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) );

    if( xPolyPoly )

    {

        aPoly = tools::Polygon(rRect);

        xPolyPoly->Insert( aPoly );

        xPolyPoly->Insert( aPoly );

    }

    else

    {

        // extend rect, to avoid missing bounding line

        tools::Rectangle aExtRect( rRect );

        aExtRect.AdjustLeft( -1 );

        aExtRect.AdjustTop( -1 );

        aExtRect.AdjustRight(1 );

        aExtRect.AdjustBottom(1 );

        aPoly = tools::Polygon(aExtRect);

        ImplDrawPolygon( aPoly, pClixPolyPoly );

    }

    // loop to output Polygon/PolyPolygon sequentially

    for( tools::Long i = 1; i < nSteps; i++ )

    {

        // calculate new Polygon

        fScanLeft += fScanIncX;

        aRect.SetLeft( static_cast<tools::Long>( fScanLeft ) );

        fScanTop += fScanIncY;

        aRect.SetTop( static_cast<tools::Long>( fScanTop ) );

        fScanRight -= fScanIncX;

        aRect.SetRight( static_cast<tools::Long>( fScanRight ) );

        fScanBottom -= fScanIncY;

        aRect.SetBottom( static_cast<tools::Long>( fScanBottom ) );

        if( ( aRect.GetWidth() < 2 ) || ( aRect.GetHeight() < 2 ) )

            break;

        if( rGradient.GetStyle() == css::awt::GradientStyle_RADIAL || rGradient.GetStyle() == css::awt::GradientStyle_ELLIPTICAL )

            aPoly = tools::Polygon( aRect.Center(), aRect.GetWidth() >> 1, aRect.GetHeight() >> 1 );

        else

            aPoly = tools::Polygon( aRect );

        aPoly.Rotate( aCenter, nAngle );

        // adapt colour accordingly

        const tools::Long nStepIndex = ( xPolyPoly ? i : ( i + 1 ) );

        nRed = GetGradientColorValue( nStartRed + ( ( nRedSteps * nStepIndex ) / nSteps ) );

        nGreen = GetGradientColorValue( nStartGreen + ( ( nGreenSteps * nStepIndex ) / nSteps ) );

        nBlue = GetGradientColorValue( nStartBlue + ( ( nBlueSteps * nStepIndex ) / nSteps ) );

        // either slow tools::PolyPolygon output or fast Polygon-Painting

        if( xPolyPoly )

        {

            bPaintLastPolygon = true; // #107349# Paint last polygon only if loop has generated any output

            xPolyPoly->Replace( xPolyPoly->GetObject( 1 ), 0 );

            xPolyPoly->Replace( aPoly, 1 );

            ImplDrawPolyPolygon( *xPolyPoly, pClixPolyPoly );

            // #107349# Set fill color _after_ geometry painting:

            // xPolyPoly's geometry is the band from last iteration's

            // aPoly to current iteration's aPoly. The window outdev

            // path (see else below), on the other hand, paints the

            // full aPoly. Thus, here, we're painting the band before

            // the one painted in the window outdev path below. To get

            // matching colors, have to delay color setting here.

            mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) );

        }

        else

        {

            // #107349# Set fill color _before_ geometry painting

            mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) );

            ImplDrawPolygon( aPoly, pClixPolyPoly );

        }

    }

    // we should draw last inner Polygon if we output PolyPolygon

    if( !xPolyPoly )

        return;

    const tools::Polygon& rPoly = xPolyPoly->GetObject( 1 );

    if( rPoly.GetBoundRect().IsEmpty() )

        return;

    // #107349# Paint last polygon with end color only if loop

    // has generated output. Otherwise, the current

    // (i.e. start) color is taken, to generate _any_ output.

    if( bPaintLastPolygon )

    {

        nRed = GetGradientColorValue( nEndRed );

        nGreen = GetGradientColorValue( nEndGreen );

        nBlue = GetGradientColorValue( nEndBlue );

    }

    mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) );

    ImplDrawPolygon( rPoly, pClixPolyPoly );

}

tools::Long OutputDevice::GetGradientStepCount( tools::Long nMinRect )

{

    tools::Long nInc = (nMinRect < 50) ? 2 : 4;

    return nInc;

}

tools::Long OutputDevice::GetGradientSteps(Gradient const& rGradient, tools::Rectangle const& rRect)

{

    // calculate step count

    tools::Long nStepCount = rGradient.GetSteps();

    if (nStepCount)

        return nStepCount;

    tools::Long nMinRect = 0;

    if (rGradient.GetStyle() == css::awt::GradientStyle_LINEAR || rGradient.GetStyle() == css::awt::GradientStyle_AXIAL)

        nMinRect = rRect.GetHeight();

    else

        nMinRect = std::min(rRect.GetWidth(), rRect.GetHeight());

    tools::Long nInc = GetGradientStepCount(nMinRect);

    if (!nInc)

        nInc = 1;

    return nMinRect / nInc;

}

Color OutputDevice::GetSingleColorGradientFill()

{

    Color aColor;

    // we should never call on this function if any of these aren't set!

    assert( mnDrawMode & ( DrawModeFlags::WhiteGradient | DrawModeFlags::SettingsGradient) );

    if ( mnDrawMode & DrawModeFlags::WhiteGradient )

        aColor = COL_WHITE;

    else if ( mnDrawMode & DrawModeFlags::SettingsGradient )

    {

        if (mnDrawMode & DrawModeFlags::SettingsForSelection)

            aColor = GetSettings().GetStyleSettings().GetHighlightColor();

        else

            aColor = GetSettings().GetStyleSettings().GetWindowColor();

    }

    return aColor;

}

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