cachedprimitivebase.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#include <com/sun/star/rendering/RepaintResult.hpp>
 
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <canvas/canvastools.hxx>
#include <cppcanvas/canvas.hxx>
 
#include "cachedprimitivebase.hxx"
#include <sal/log.hxx>
#include <utility>
 
using namespace ::com::sun::star;
 
namespace cppcanvas::internal
{
        CachedPrimitiveBase::CachedPrimitiveBase( CanvasSharedPtr        xCanvas,
                                                  bool                   bOnlyRedrawWithSameTransform ) :
            mpCanvas(std::move( xCanvas )),
            mbOnlyRedrawWithSameTransform( bOnlyRedrawWithSameTransform )
        {
            // TODO(F2): also store last view transform, and refuse to
            // redraw if changed.
        }
 
        bool CachedPrimitiveBase::render( const ::basegfx::B2DHomMatrix& rTransformation ) const
        {
            SAL_INFO( "cppcanvas.emf", "::cppcanvas::internal::CachedPrimitiveBase::render()" );
            SAL_INFO( "cppcanvas.emf", "::cppcanvas::internal::CachedPrimitiveBase: 0x" << std::hex << this );
 
            const rendering::ViewState& rViewState( mpCanvas->getViewState() );
            ::basegfx::B2DHomMatrix     aTotalTransform;
 
            ::canvas::tools::getViewStateTransform( aTotalTransform,
                                                    rViewState );
            aTotalTransform *= rTransformation;
 
            // can we use the cached primitive? For that, it must be
            // present in the first place, and, if
            // mbOnlyRedrawWithSameTransform is true, the overall
            // transformation must be the same.
            if( mxCachedPrimitive.is() &&
                (!mbOnlyRedrawWithSameTransform ||
                 maLastTransformation == aTotalTransform) )
            {
                if( mxCachedPrimitive->redraw( rViewState ) ==
                    rendering::RepaintResult::REDRAWN )
                {
                    // cached repaint succeeded, done.
                    return true;
                }
            }
 
            maLastTransformation = aTotalTransform;
 
            // delegate rendering to derived classes
            return renderPrimitive( mxCachedPrimitive,
                                    rTransformation );
        }
}
 
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