/* -*- 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

 *   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

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 */

#include <drawinglayer/primitive2d/discreteshadowprimitive2d.hxx>

#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>

#include <drawinglayer/primitive2d/bitmapprimitive2d.hxx>

#include <basegfx/matrix/b2dhommatrixtools.hxx>

#include <drawinglayer/primitive2d/transformprimitive2d.hxx>

#include <drawinglayer/geometry/viewinformation2d.hxx>

#include <osl/diagnose.h>

namespace drawinglayer::primitive2d

{

        DiscreteShadow::DiscreteShadow(const Bitmap& rBitmap)

        :   maBitmap(rBitmap)

        {

            maBitmap.Invert(); // convert transparency to alpha

            const Size aBitmapSize = getBitmap().GetSizePixel();

            if(aBitmapSize.Width() != aBitmapSize.Height() || aBitmapSize.Width() < 7)

            {

                OSL_ENSURE(false, "DiscreteShadowPrimitive2D: wrong bitmap format (!)");

                maBitmap = Bitmap();

            }

        }

        const Bitmap& DiscreteShadow::getTopLeft() const

        {

            if(maTopLeft.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maTopLeft = getBitmap();

                const_cast< DiscreteShadow* >(this)->maTopLeft.Crop(

                    ::tools::Rectangle(Point(0, 0), Size((nQuarter * 2) + 1, (nQuarter * 2) + 1)));

            }

            return maTopLeft;

        }

        const Bitmap& DiscreteShadow::getTop() const

        {

            if(maTop.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maTop = getBitmap();

                const_cast< DiscreteShadow* >(this)->maTop.Crop(

                    ::tools::Rectangle(Point((nQuarter * 2) + 1, 0), Size(1, nQuarter)));

            }

            return maTop;

        }

        const Bitmap& DiscreteShadow::getTopRight() const

        {

            if(maTopRight.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maTopRight = getBitmap();

                const_cast< DiscreteShadow* >(this)->maTopRight.Crop(

                    ::tools::Rectangle(Point((nQuarter * 2) + 2, 0), Size((nQuarter * 2) + 1, (nQuarter * 2) + 1)));

            }

            return maTopRight;

        }

        const Bitmap& DiscreteShadow::getRight() const

        {

            if(maRight.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maRight = getBitmap();

                const_cast< DiscreteShadow* >(this)->maRight.Crop(

                    ::tools::Rectangle(Point((nQuarter * 3) + 3, (nQuarter * 2) + 1), Size(nQuarter, 1)));

            }

            return maRight;

        }

        const Bitmap& DiscreteShadow::getBottomRight() const

        {

            if(maBottomRight.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maBottomRight = getBitmap();

                const_cast< DiscreteShadow* >(this)->maBottomRight.Crop(

                    ::tools::Rectangle(Point((nQuarter * 2) + 2, (nQuarter * 2) + 2), Size((nQuarter * 2) + 1, (nQuarter * 2) + 1)));

            }

            return maBottomRight;

        }

        const Bitmap& DiscreteShadow::getBottom() const

        {

            if(maBottom.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maBottom = getBitmap();

                const_cast< DiscreteShadow* >(this)->maBottom.Crop(

                    ::tools::Rectangle(Point((nQuarter * 2) + 1, (nQuarter * 3) + 3), Size(1, nQuarter)));

            }

            return maBottom;

        }

        const Bitmap& DiscreteShadow::getBottomLeft() const

        {

            if(maBottomLeft.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maBottomLeft = getBitmap();

                const_cast< DiscreteShadow* >(this)->maBottomLeft.Crop(

                    ::tools::Rectangle(Point(0, (nQuarter * 2) + 2), Size((nQuarter * 2) + 1, (nQuarter * 2) + 1)));

            }

            return maBottomLeft;

        }

        const Bitmap& DiscreteShadow::getLeft() const

        {

            if(maLeft.IsEmpty())

            {

                const sal_Int32 nQuarter((getBitmap().GetSizePixel().Width() - 3) >> 2);

                const_cast< DiscreteShadow* >(this)->maLeft = getBitmap();

                const_cast< DiscreteShadow* >(this)->maLeft.Crop(

                    ::tools::Rectangle(Point(0, (nQuarter * 2) + 1), Size(nQuarter, 1)));

            }

            return maLeft;

        }

} // end of namespace

namespace drawinglayer::primitive2d

{

        Primitive2DReference DiscreteShadowPrimitive2D::create2DDecomposition(const geometry::ViewInformation2D& /*rViewInformation*/) const

        {

            Primitive2DContainer xRetval;

            if(getDiscreteShadow().getBitmap().IsEmpty())

                return nullptr;

            const sal_Int32 nQuarter((getDiscreteShadow().getBitmap().GetSizePixel().Width() - 3) >> 2);

            const basegfx::B2DVector aScale(getTransform() * basegfx::B2DVector(1.0, 1.0));

            const double fSingleX(getDiscreteUnit() / aScale.getX());

            const double fSingleY(getDiscreteUnit() / aScale.getY());

            const double fBorderX(fSingleX * nQuarter);

            const double fBorderY(fSingleY * nQuarter);

            const double fBigLenX((fBorderX * 2.0) + fSingleX);

            const double fBigLenY((fBorderY * 2.0) + fSingleY);

            xRetval.resize(8);

            // TopLeft

            xRetval[0] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getTopLeft(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        fBigLenX,

                        fBigLenY,

                        -fBorderX,

                        -fBorderY));

            // Top

            xRetval[1] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getTop(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        1.0 - (2.0 * (fBorderX + fSingleX)) + fSingleX,

                        fBorderY,

                        fBorderX + fSingleX,

                        -fBorderY));

            // TopRight

            xRetval[2] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getTopRight(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        fBigLenX,

                        fBigLenY,

                        1.0 - fBorderX,

                        -fBorderY));

            // Right

            xRetval[3] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getRight(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        fBorderX,

                        1.0 - (2.0 * (fBorderY + fSingleY)) + fSingleY,

                        1.0 + fSingleX,

                        fBorderY + fSingleY));

            // BottomRight

            xRetval[4] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getBottomRight(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        fBigLenX,

                        fBigLenY,

                        1.0 - (fBorderX + fSingleX) + fSingleX,

                        1.0 - (fBorderY + fSingleY) + fSingleY));

            // Bottom

            xRetval[5] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getBottom(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        1.0 - (2.0 * (fBorderX + fSingleX)) + fSingleX,

                        fBorderY,

                        fBorderX + fSingleX,

                        1.0 + fSingleY));

            // BottomLeft

            xRetval[6] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getBottomLeft(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        fBigLenX,

                        fBigLenY,

                        -fBorderX,

                        1.0 - fBorderY));

            // Left

            xRetval[7] =

                new BitmapPrimitive2D(

                    getDiscreteShadow().getLeft(),

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        fBorderX,

                        1.0 - (2.0 * (fBorderY + fSingleY)) + fSingleY,

                        -fBorderX,

                        fBorderY + fSingleY));

            // put all in object transformation to get to target positions

            return

                new TransformPrimitive2D(

                    getTransform(),

                    std::move(xRetval));

        }

        DiscreteShadowPrimitive2D::DiscreteShadowPrimitive2D(

            const basegfx::B2DHomMatrix& rTransform,

            const DiscreteShadow& rDiscreteShadow)

        :   maTransform(rTransform),

            maDiscreteShadow(rDiscreteShadow)

        {

        }

        bool DiscreteShadowPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const

        {

            if(DiscreteMetricDependentPrimitive2D::operator==(rPrimitive))

            {

                const DiscreteShadowPrimitive2D& rCompare = static_cast<const DiscreteShadowPrimitive2D&>(rPrimitive);

                return (getTransform() == rCompare.getTransform()

                    && getDiscreteShadow() == rCompare.getDiscreteShadow());

            }

            return false;

        }

        basegfx::B2DRange DiscreteShadowPrimitive2D::getB2DRange(const geometry::ViewInformation2D& rViewInformation) const

        {

            if(getDiscreteShadow().getBitmap().IsEmpty())

            {

                // no graphics without valid bitmap definition

                return basegfx::B2DRange();

            }

            else

            {

                // prepare normal objectrange

                basegfx::B2DRange aRetval(0.0, 0.0, 1.0, 1.0);

                aRetval.transform(getTransform());

                // extract discrete shadow size and grow

                const basegfx::B2DVector aScale(rViewInformation.getViewTransformation() * basegfx::B2DVector(1.0, 1.0));

                const sal_Int32 nQuarter((getDiscreteShadow().getBitmap().GetSizePixel().Width() - 3) >> 2);

                const double fGrowX((1.0 / aScale.getX()) * nQuarter);

                const double fGrowY((1.0 / aScale.getY()) * nQuarter);

                aRetval.grow(std::max(fGrowX, fGrowY));

                return aRetval;

            }

        }

        // provide unique ID

        sal_uInt32 DiscreteShadowPrimitive2D::getPrimitive2DID() const

        {

            return PRIMITIVE2D_ID_DISCRETESHADOWPRIMITIVE2D;

        }

} // end of namespace

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