/* -*- 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
 *   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 .
 */

#pragma once

#include <drawinglayer/drawinglayerdllapi.h>

#include <drawinglayer/primitive2d/BufferedDecompositionPrimitive2D.hxx>
#include <drawinglayer/attribute/fillgradientattribute.hxx>


// predefines

namespace basegfx { class B2DPolygon; }
namespace drawinglayer::texture { struct B2DHomMatrixAndBColor; }


// FillGradientPrimitive2D class

namespace drawinglayer::primitive2d
{
        /** FillGradientPrimitive2D class

            This class defines a gradient filling for a rectangular area. The
            Range is defined by the Transformation, the gradient by the FillGradientAttribute.

            The decomposition will deliver the decomposed gradient, e.g. for an ellipse
            gradient the various ellipses in various color steps will be created.

            I have added functionality to create both versions of filled decompositions:
            Those who overlap and non-overlapping ones. The overlapping version is the
            default one since it works with and without AntiAliasing. The non-overlapping
            version is used in the MetafilePrimitive2D decomposition when the old XOR
            paint was recorded.
         */
        class DRAWINGLAYER_DLLPUBLIC FillGradientPrimitive2D : public BufferedDecompositionPrimitive2D
        {
        private:
            /// the geometrically visible area
            basegfx::B2DRange                       maOutputRange;

            /// the area the gradient definition is based on
            /// in the simplest case identical to OutputRange
            basegfx::B2DRange                       maDefinitionRange;

            /// the gradient definition
            attribute::FillGradientAttribute        maFillGradient;

            /// local helpers
            void generateMatricesAndColors(
                std::vector< drawinglayer::texture::B2DHomMatrixAndBColor >& rEntries,
                basegfx::BColor& rOuterColor) const;
            void createOverlappingFill(
                Primitive2DContainer& rContainer,
                const std::vector< drawinglayer::texture::B2DHomMatrixAndBColor >& rEntries,
                const basegfx::BColor& rOuterColor,
                const basegfx::B2DPolygon& rUnitPolygon) const;
            void createNonOverlappingFill(
                Primitive2DContainer& rContainer,
                const std::vector< drawinglayer::texture::B2DHomMatrixAndBColor >& rEntries,
                const basegfx::BColor& rOuterColor,
                const basegfx::B2DPolygon& rUnitPolygon) const;

        protected:
            /// local helper
            void createFill(Primitive2DContainer& rContainer, bool bOverlapping) const;

            /// local decomposition.
            virtual void create2DDecomposition(Primitive2DContainer& rContainer, const geometry::ViewInformation2D& rViewInformation) const override;

        public:
            /// constructors. The one without definition range will use output range as definition range
            FillGradientPrimitive2D(
                const basegfx::B2DRange& rOutputRange,
                const attribute::FillGradientAttribute& rFillGradient);
            FillGradientPrimitive2D(
                const basegfx::B2DRange& rOutputRange,
                const basegfx::B2DRange& rDefinitionRange,
                const attribute::FillGradientAttribute& rFillGradient);

            /// data read access
            const basegfx::B2DRange& getOutputRange() const { return maOutputRange; }
            const basegfx::B2DRange& getDefinitionRange() const { return maDefinitionRange; }
            const attribute::FillGradientAttribute& getFillGradient() const { return maFillGradient; }

            /// compare operator
            virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;

            /// get range
            virtual basegfx::B2DRange getB2DRange(const geometry::ViewInformation2D& rViewInformation) const override;

            /// provide unique ID
            virtual sal_uInt32 getPrimitive2DID() const override;
        };
} // end of namespace drawinglayer::primitive2d


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