124 lines
5.5 KiB
C++
124 lines
5.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#pragma once
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#include <drawinglayer/drawinglayerdllapi.h>
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#include <drawinglayer/primitive2d/BufferedDecompositionPrimitive2D.hxx>
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#include <drawinglayer/attribute/fillgradientattribute.hxx>
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// predefines
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namespace basegfx { class B2DPolygon; }
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// FillGradientPrimitive2D class
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namespace drawinglayer::primitive2d
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{
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/** FillGradientPrimitive2D class
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This class defines a gradient filling for a rectangular area. The
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Range is defined by the Transformation, the gradient by the FillGradientAttribute.
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The decomposition will deliver the decomposed gradient, e.g. for an ellipse
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gradient the various ellipses in various color steps will be created.
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I have added functionality to create both versions of filled decompositions:
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Those who overlap and non-overlapping ones. The overlapping version is the
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default one since it works with and without AntiAliasing. The non-overlapping
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version is used in the MetafilePrimitive2D decomposition when the old XOR
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paint was recorded.
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SDPR: Have now added to directly support alpha in the definition so that
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all implementations of primitive renderers may use it. Be aware that if a
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renderer does not support using that alpha it is advised to use the
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decomposition which separates content and alpha in a TransparencePrimitive2D.
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That way all stuff being used to that before will work unchanged.
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*/
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class DRAWINGLAYER_DLLPUBLIC FillGradientPrimitive2D : public BufferedDecompositionPrimitive2D
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{
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private:
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/// the geometrically visible area
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basegfx::B2DRange maOutputRange;
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/// the area the gradient definition is based on
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/// in the simplest case identical to OutputRange
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basegfx::B2DRange maDefinitionRange;
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/// the gradient definition
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attribute::FillGradientAttribute maFillGradient;
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/// evtl. fitting alphaGradient definition
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attribute::FillGradientAttribute maAlphaGradient;
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/// the transparency in range [0.0 .. 1.0]
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double mfTransparency;
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protected:
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/// local helper
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Primitive2DReference createFill(bool bOverlapping) const;
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/// local decomposition.
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virtual Primitive2DReference create2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const override;
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public:
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/// helpers that support e.g. direct paint/geometry creation
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basegfx::B2DPolygon getUnitPolygon() const;
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basegfx::BColor getOuterColor() const;
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void generateMatricesAndColors(
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std::function<void(const basegfx::B2DHomMatrix& rMatrix, const basegfx::BColor& rColor)> aCallback) const;
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/// constructors. The one without definition range will use output range as definition range
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FillGradientPrimitive2D(
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const basegfx::B2DRange& rOutputRange,
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const attribute::FillGradientAttribute& rFillGradient);
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FillGradientPrimitive2D(
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const basegfx::B2DRange& rOutputRange,
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const basegfx::B2DRange& rDefinitionRange,
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const attribute::FillGradientAttribute& rFillGradient,
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const attribute::FillGradientAttribute* pAlphaGradient = nullptr,
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double fTransparency = 0.0);
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/// data read access
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const basegfx::B2DRange& getOutputRange() const { return maOutputRange; }
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const basegfx::B2DRange& getDefinitionRange() const { return maDefinitionRange; }
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const attribute::FillGradientAttribute& getFillGradient() const { return maFillGradient; }
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const attribute::FillGradientAttribute& getAlphaGradient() const { return maAlphaGradient; }
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bool hasAlphaGradient() const { return !maAlphaGradient.isDefault(); }
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double getTransparency() const { return mfTransparency; }
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bool hasTransparency() const { return !basegfx::fTools::equalZero(mfTransparency); }
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/// compare operator
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virtual bool operator==(const BasePrimitive2D& rPrimitive) const override final;
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/// get range
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virtual basegfx::B2DRange getB2DRange(const geometry::ViewInformation2D& rViewInformation) const override final;
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/// provide unique ID
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virtual sal_uInt32 getPrimitive2DID() const override final;
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};
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} // end of namespace drawinglayer::primitive2d
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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