cppcanvas/source/mtfrenderer/cachedprimitivebase.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   9  * This file incorporates work covered by the following license notice:
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  15  *   License, Version 2.0 (the "License"); you may not use this file
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include <com/sun/star/rendering/RepaintResult.hpp>
  22
  23 #include <basegfx/matrix/b2dhommatrix.hxx>
  24 #include <canvas/canvastools.hxx>
  25 #include <cppcanvas/canvas.hxx>
  26
  27 #include "cachedprimitivebase.hxx"
  28 #include <sal/log.hxx>
  29
  30 using namespace ::com::sun::star;
  31
  32 namespace cppcanvas::internal
  33 {
  34         CachedPrimitiveBase::CachedPrimitiveBase( const CanvasSharedPtr& rCanvas,
  35                                                   bool                   bOnlyRedrawWithSameTransform ) :
  36             mpCanvas( rCanvas ),
  37             mxCachedPrimitive(),
  38             maLastTransformation(),
  39             mbOnlyRedrawWithSameTransform( bOnlyRedrawWithSameTransform )
  40         {
  41             // TODO(F2): also store last view transform, and refuse to
  42             // redraw if changed.
  43         }
  44
  45         bool CachedPrimitiveBase::render( const ::basegfx::B2DHomMatrix& rTransformation ) const
  46         {
  47             SAL_INFO( "cppcanvas.emf", "::cppcanvas::internal::CachedPrimitiveBase::render()" );
  48             SAL_INFO( "cppcanvas.emf", "::cppcanvas::internal::CachedPrimitiveBase: 0x" << std::hex << this );
  49
  50             const rendering::ViewState& rViewState( mpCanvas->getViewState() );
  51             ::basegfx::B2DHomMatrix     aTotalTransform;
  52
  53             ::canvas::tools::getViewStateTransform( aTotalTransform,
  54                                                     rViewState );
  55             aTotalTransform *= rTransformation;
  56
  57             // can we use the cached primitive? For that, it must be
  58             // present in the first place, and, if
  59             // mbOnlyRedrawWithSameTransform is true, the overall
  60             // transformation must be the same.
  61             if( mxCachedPrimitive.is() &&
  62                 (!mbOnlyRedrawWithSameTransform ||
  63                  maLastTransformation == aTotalTransform) )
  64             {
  65                 if( mxCachedPrimitive->redraw( rViewState ) ==
  66                     rendering::RepaintResult::REDRAWN )
  67                 {
  68                     // cached repaint succeeded, done.
  69                     return true;
  70                 }
  71             }
  72
  73             maLastTransformation = aTotalTransform;
  74
  75             // delegate rendering to derived classes
  76             return renderPrimitive( mxCachedPrimitive,
  77                                     rTransformation );
  78         }
  79 }
  80
  81 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */