    /* -*- 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 <sal/config.h>

    #include <basegfx/matrix/b2dhommatrix.hxx>
    #include <basegfx/matrix/b2dhommatrixtools.hxx>
    #include <com/sun/star/lang/XServiceName.hpp>
    #include <com/sun/star/rendering/CompositeOperation.hpp>
    #include <com/sun/star/rendering/PanoseLetterForm.hpp>
    #include <com/sun/star/rendering/PanoseWeight.hpp>
    #include <com/sun/star/rendering/XSimpleCanvas.hpp>
    #include <comphelper/servicedecl.hxx>
    #include <cppuhelper/basemutex.hxx>
    #include <cppuhelper/compbase.hxx>
    #include <cppuhelper/factory.hxx>
    #include <cppuhelper/implementationentry.hxx>
    #include <o3tl/lazy_update.hxx>

    #include <canvas/canvastools.hxx>

    #include <functional>

    #define SERVICE_NAME "com.sun.star.rendering.SimpleCanvas"

    using namespace ::com::sun::star;
    using namespace canvas;

    namespace
    {
        inline uno::Sequence< double > color2Sequence( sal_Int32 nColor )
        {
            // TODO(F3): Color management
            uno::Sequence< double > aRes( 4 );

            aRes[0] = static_cast<sal_uInt8>( (nColor&0xFF000000U) >> 24U ) / 255.0;
            aRes[1] = static_cast<sal_uInt8>( (nColor&0x00FF0000U) >> 16U ) / 255.0;
            aRes[2] = static_cast<sal_uInt8>( (nColor&0x0000FF00U) >>  8U ) / 255.0;
            aRes[3] = static_cast<sal_uInt8>( (nColor&0x000000FFU) )        / 255.0;

            return aRes;
        }

        inline uno::Reference< rendering::XPolyPolygon2D > rect2Poly( uno::Reference<rendering::XGraphicDevice> const& xDevice,
                                                                      geometry::RealRectangle2D const&                 rRect )
        {
            uno::Sequence< geometry::RealPoint2D > rectSequence( 4 );
            geometry::RealPoint2D* pOutput = rectSequence.getArray();
            pOutput[0] = geometry::RealPoint2D( rRect.X1, rRect.Y1 );
            pOutput[1] = geometry::RealPoint2D( rRect.X2, rRect.Y1 );
            pOutput[2] = geometry::RealPoint2D( rRect.X2, rRect.Y2 );
            pOutput[3] = geometry::RealPoint2D( rRect.X1, rRect.Y2 );

            uno::Sequence< uno::Sequence< geometry::RealPoint2D > > sequenceSequence( 1 );
            sequenceSequence[0] = rectSequence;

            uno::Reference< rendering::XPolyPolygon2D > xRes(
                xDevice->createCompatibleLinePolyPolygon( sequenceSequence ),
                uno::UNO_QUERY );
            if( xRes.is() )
                xRes->setClosed( 0, true );
            return xRes;
        }

        struct SimpleRenderState
        {
            o3tl::LazyUpdate<sal_Int32,
                             uno::Sequence<double>,
                             decltype(&color2Sequence)>                   m_aPenColor;
            o3tl::LazyUpdate<sal_Int32,
                             uno::Sequence<double>,
                             decltype(&color2Sequence)>                   m_aFillColor;
            o3tl::LazyUpdate<geometry::RealRectangle2D,
                             uno::Reference< rendering::XPolyPolygon2D >,
                             std::function<uno::Reference<rendering::XPolyPolygon2D> (geometry::RealRectangle2D)> > m_aRectClip;
            geometry::AffineMatrix2D                                      m_aTransformation;

            explicit SimpleRenderState( uno::Reference<rendering::XGraphicDevice> const& xDevice ) :
                m_aPenColor( &color2Sequence),
                m_aFillColor( &color2Sequence ),
                m_aRectClip( [&xDevice](geometry::RealRectangle2D const& rRect) { return rect2Poly(xDevice, rRect); } ),
                m_aTransformation()
            {
                tools::setIdentityAffineMatrix2D( m_aTransformation );
            }
        };

        typedef ::cppu::WeakComponentImplHelper< css::rendering::XSimpleCanvas,
                                                 css::lang::XServiceName >    SimpleCanvasBase;

        class SimpleCanvasImpl : private cppu::BaseMutex,
                                 public SimpleCanvasBase
        {
        private:
            bool isStrokingEnabled() const
            {
                return maRenderState.m_aPenColor.getInValue() && sal_Int32(0xFF) != 0;
            }

            rendering::RenderState createStrokingRenderState() const
            {
                return rendering::RenderState(maRenderState.m_aTransformation,
                                              *maRenderState.m_aRectClip,
                                              *maRenderState.m_aPenColor,
                                              rendering::CompositeOperation::OVER);
            }

            bool isFillingEnabled() const
            {
                return maRenderState.m_aFillColor.getInValue() && sal_Int32(0xFF) != 0;
            }

            rendering::RenderState createFillingRenderState() const
            {
                return rendering::RenderState(maRenderState.m_aTransformation,
                                              *maRenderState.m_aRectClip,
                                              *maRenderState.m_aFillColor,
                                              rendering::CompositeOperation::OVER);
            }

            static uno::Reference<rendering::XCanvas> grabCanvas( uno::Sequence<uno::Any> const& rArgs )
            {
                uno::Reference<rendering::XCanvas> xRet;

                // can't do much without an XCanvas, can't we?
                if( rArgs.getLength() < 1 )
                    throw lang::IllegalArgumentException();

                xRet.set( rArgs[0], uno::UNO_QUERY );

                // can't do much without an XCanvas, can't we?
                if( !xRet.is() )
                    throw lang::IllegalArgumentException();

                return xRet;
            }

        public:
            SimpleCanvasImpl( const uno::Sequence< uno::Any >&                aArguments,
                              const uno::Reference< uno::XComponentContext >&  ) :
                SimpleCanvasBase( m_aMutex ),
                mxCanvas( grabCanvas(aArguments) ),
                maFont([this](rendering::FontRequest const& rFontRequest) {
                       return mxCanvas->createFont(rFontRequest,
                                                   uno::Sequence< beans::PropertyValue >(),
                                                   geometry::Matrix2D()); } ),
                maViewState(),
                maRenderState( mxCanvas->getDevice() )
            {
                tools::initViewState(maViewState);
            }

        private:
            // Ifc XServiceName
            virtual OUString SAL_CALL getServiceName(  ) override
            {
                return OUString( SERVICE_NAME );
            }

            // Ifc XSimpleCanvas
            virtual void SAL_CALL selectFont( const OUString& sFontName,
                                              double                 size,
                                              sal_Bool             bold,
                                              sal_Bool             italic ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );

                maFont->FontDescription.FamilyName = sFontName;
                maFont->CellSize = size;
                maFont->FontDescription.FontDescription.Weight =
                    bold ? rendering::PanoseWeight::BOLD : rendering::PanoseWeight::MEDIUM;
                maFont->FontDescription.FontDescription.Letterform =
                    italic ? rendering::PanoseLetterForm::OBLIQUE_CONTACT : rendering::PanoseLetterForm::ANYTHING;
            }

            virtual void SAL_CALL setPenColor( ::sal_Int32 nsRgbaColor ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                *(maRenderState.m_aPenColor) = nsRgbaColor;
            }

            virtual void SAL_CALL setFillColor( ::sal_Int32 nsRgbaColor ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                *(maRenderState.m_aFillColor) = nsRgbaColor;
            }

            virtual void SAL_CALL setRectClip( const geometry::RealRectangle2D& aRect ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                *(maRenderState.m_aRectClip) = aRect;
            }

            virtual void SAL_CALL setTransformation( const geometry::AffineMatrix2D& aTransform ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                maRenderState.m_aTransformation = aTransform;
            }

            virtual void SAL_CALL drawPixel( const geometry::RealPoint2D& aPoint ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                mxCanvas->drawPoint(aPoint,
                                    maViewState,
                                    createFillingRenderState());
            }

            virtual void SAL_CALL drawLine( const geometry::RealPoint2D& aStartPoint,
                                            const geometry::RealPoint2D& aEndPoint ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                mxCanvas->drawLine(aStartPoint,
                                   aEndPoint,
                                   maViewState,
                                   createStrokingRenderState());
            }

            virtual void SAL_CALL drawRect( const geometry::RealRectangle2D& aRect ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                uno::Reference< rendering::XPolyPolygon2D > xPoly(
                    rect2Poly( mxCanvas->getDevice(),
                               aRect));

                if( isFillingEnabled() )
                    mxCanvas->drawPolyPolygon(xPoly,
                                              maViewState,
                                              createFillingRenderState());
                if( isStrokingEnabled() )
                    mxCanvas->drawPolyPolygon(xPoly,
                                              maViewState,
                                              createStrokingRenderState());
            }

            virtual void SAL_CALL drawPolyPolygon( const uno::Reference< rendering::XPolyPolygon2D >& xPolyPolygon ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );

                if( isFillingEnabled() )
                    mxCanvas->drawPolyPolygon(xPolyPolygon,
                                              maViewState,
                                              createFillingRenderState());
                if( isStrokingEnabled() )
                    mxCanvas->drawPolyPolygon(xPolyPolygon,
                                              maViewState,
                                              createStrokingRenderState());
            }

            virtual void SAL_CALL drawText( const rendering::StringContext& aText,
                                            const geometry::RealPoint2D&    aOutPos,
                                            ::sal_Int8                      nTextDirection ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                const basegfx::B2DHomMatrix offsetTransform(basegfx::utils::createTranslateB2DHomMatrix(aOutPos.X,aOutPos.Y));
                rendering::RenderState aRenderState( createStrokingRenderState() );
                tools::appendToRenderState(aRenderState, offsetTransform);

                mxCanvas->drawText(aText,
                                   maFont.getOutValue(),
                                   maViewState,
                                   aRenderState,
                                   nTextDirection);
            }

            virtual void SAL_CALL drawBitmap( const uno::Reference< rendering::XBitmap >& xBitmap,
                                              const geometry::RealPoint2D&                aLeftTop ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                const basegfx::B2DHomMatrix offsetTransform(basegfx::utils::createTranslateB2DHomMatrix(aLeftTop.X,aLeftTop.Y));
                rendering::RenderState aRenderState( createStrokingRenderState() );
                tools::appendToRenderState(aRenderState, offsetTransform);

                mxCanvas->drawBitmap(xBitmap,maViewState,aRenderState);
            }

            virtual uno::Reference< rendering::XGraphicDevice > SAL_CALL getDevice(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return mxCanvas->getDevice();
            }

            virtual uno::Reference< rendering::XCanvas > SAL_CALL getCanvas(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return mxCanvas;
            }

            virtual rendering::FontMetrics SAL_CALL getFontMetrics(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return maFont.getOutValue()->getFontMetrics();
            }

            virtual uno::Reference< rendering::XCanvasFont > SAL_CALL getCurrentFont(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return maFont.getOutValue();
            }

            virtual ::sal_Int32 SAL_CALL getCurrentPenColor(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return maRenderState.m_aPenColor.getInValue();
            }

            virtual ::sal_Int32 SAL_CALL getCurrentFillColor(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return maRenderState.m_aFillColor.getInValue();
            }

            virtual geometry::RealRectangle2D SAL_CALL getCurrentClipRect(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return maRenderState.m_aRectClip.getInValue();
            }

            virtual geometry::AffineMatrix2D SAL_CALL getCurrentTransformation(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return maRenderState.m_aTransformation;
            }

            virtual rendering::ViewState SAL_CALL getCurrentViewState(  ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                return maViewState;
            }

            virtual rendering::RenderState SAL_CALL getCurrentRenderState( sal_Bool bUseFillColor ) override
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                if( bUseFillColor )
                    return createFillingRenderState();
                else
                    return createStrokingRenderState();
            }

            typedef o3tl::LazyUpdate<
                rendering::FontRequest,
                uno::Reference< rendering::XCanvasFont >,
                std::function<uno::Reference<rendering::XCanvasFont> (rendering::FontRequest)> > SimpleFont;

            uno::Reference<rendering::XCanvas> mxCanvas;
            SimpleFont                         maFont;
            rendering::ViewState               maViewState;
            SimpleRenderState                  maRenderState;
        };

        namespace sdecl = comphelper::service_decl;
        const sdecl::ServiceDecl simpleCanvasDecl(
            sdecl::class_<SimpleCanvasImpl, sdecl::with_args<true> >(),
            "com.sun.star.comp.rendering.SimpleCanvas",
            SERVICE_NAME );
    }

    // The C shared lib entry points
    extern "C" SAL_DLLPUBLIC_EXPORT void* simplecanvas_component_getFactory( sal_Char const* pImplName,
                                             void*, void* )
    {
        return sdecl::component_getFactoryHelper( pImplName, {&simpleCanvasDecl} );
    }

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V560 A part of conditional expression is always true: sal_Int32(0xFF) != 0.

↑ V560 A part of conditional expression is always true: sal_Int32(0xFF) != 0.