/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

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 *

 * 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

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 *   ownership. The ASF licenses this file to you under the Apache

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#include <drawinglayer/primitive2d/unifiedtransparenceprimitive2d.hxx>

#include <basegfx/polygon/b2dpolygon.hxx>

#include <basegfx/polygon/b2dpolygontools.hxx>

#include <basegfx/color/bcolor.hxx>

#include <drawinglayer/primitive2d/PolygonHairlinePrimitive2D.hxx>

#include <drawinglayer/primitive2d/PolyPolygonColorPrimitive2D.hxx>

#include <drawinglayer/primitive2d/transparenceprimitive2d.hxx>

#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>

namespace drawinglayer::primitive2d

{

        UnifiedTransparencePrimitive2D::UnifiedTransparencePrimitive2D(

            Primitive2DContainer&& aChildren,

            double fTransparence)

        :   GroupPrimitive2D(std::move(aChildren)),

            mfTransparence(fTransparence)

        {

        }

        bool UnifiedTransparencePrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const

        {

            if(GroupPrimitive2D::operator==(rPrimitive))

            {

                const UnifiedTransparencePrimitive2D& rCompare = static_cast<const UnifiedTransparencePrimitive2D&>(rPrimitive);

                return (getTransparence() == rCompare.getTransparence());

            }

            return false;

        }

        basegfx::B2DRange UnifiedTransparencePrimitive2D::getB2DRange(const geometry::ViewInformation2D& rViewInformation) const

        {

            // do not use the fallback to decomposition here since for a correct BoundRect we also

            // need invisible (1.0 == getTransparence()) geometry; these would be deleted in the decomposition

            return getChildren().getB2DRange( rViewInformation);

        }

        void UnifiedTransparencePrimitive2D::get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& rViewInformation) const

        {

            if(0.0 == getTransparence())

            {

                // no transparence used, so just use the content

                getChildren(rVisitor);

            }

            else if(getTransparence() > 0.0 && getTransparence() < 1.0)

            {

                // The idea is to create a TransparencePrimitive2D with transparent content using a fill color

                // corresponding to the transparence value. Problem is that in most systems, the right

                // and bottom pixel array is not filled when filling polygons, thus this would not

                // always produce a complete transparent bitmap. There are some solutions:

                // - Grow the used polygon range by one discrete unit in X and Y. This

                // will make the decomposition view-dependent.

                // - For all filled polygon renderings, draw the polygon outline extra. This

                // would lead to unwanted side effects when using concatenated polygons.

                // - At this decomposition, add a filled polygon and a hairline polygon. This

                // solution stays view-independent.

                // I will take the last one here. The small overhead of two primitives will only be

                // used when UnifiedTransparencePrimitive2D is not handled directly.

                const basegfx::B2DRange aPolygonRange(getChildren().getB2DRange(rViewInformation));

                basegfx::B2DPolygon aPolygon(basegfx::utils::createPolygonFromRect(aPolygonRange));

                const basegfx::BColor aGray(getTransparence(), getTransparence(), getTransparence());

                Primitive2DContainer aTransparenceContent(2);

                aTransparenceContent[0] = new PolyPolygonColorPrimitive2D(basegfx::B2DPolyPolygon(aPolygon), aGray);

                aTransparenceContent[1] = new PolygonHairlinePrimitive2D(std::move(aPolygon), aGray);

                // create sub-transparence group with a gray-colored rectangular fill polygon

                rVisitor.visit(new TransparencePrimitive2D(Primitive2DContainer(getChildren()), std::move(aTransparenceContent)));

            }

            else

            {

                // completely transparent or invalid definition, add nothing

            }

        }

        // provide unique ID

        sal_uInt32 UnifiedTransparencePrimitive2D::getPrimitive2DID() const

        {

            return PRIMITIVE2D_ID_UNIFIEDTRANSPARENCEPRIMITIVE2D;

        }

} // end of namespace

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