cppcanvas/source/mtfrenderer/cachedprimitivebase.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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
  29 using namespace ::com::sun::star;
  30
  31 namespace cppcanvas
  32 {
  33     namespace internal
  34     {
  35         CachedPrimitiveBase::CachedPrimitiveBase( const CanvasSharedPtr& rCanvas,
  36                                                   bool                   bOnlyRedrawWithSameTransform ) :
  37             mpCanvas( rCanvas ),
  38             mxCachedPrimitive(),
  39             maLastTransformation(),
  40             mbOnlyRedrawWithSameTransform( bOnlyRedrawWithSameTransform )
  41         {
  42             // TODO(F2): also store last view transform, and refuse to
  43             // redraw if changed.
  44         }
  45
  46         bool CachedPrimitiveBase::render( const ::basegfx::B2DHomMatrix& rTransformation ) const
  47         {
  48             SAL_INFO( "cppcanvas.emf", "::cppcanvas::internal::CachedPrimitiveBase::render()" );
  49             SAL_INFO( "cppcanvas.emf", "::cppcanvas::internal::CachedPrimitiveBase: 0x" << std::hex << this );
  50
  51             const rendering::ViewState& rViewState( mpCanvas->getViewState() );
  52             ::basegfx::B2DHomMatrix     aTotalTransform;
  53
  54             ::canvas::tools::getViewStateTransform( aTotalTransform,
  55                                                     rViewState );
  56             aTotalTransform *= rTransformation;
  57
  58             // can we use the cached primitive? For that, it must be
  59             // present in the first place, and, if
  60             // mbOnlyRedrawWithSameTransform is true, the overall
  61             // transformation must be the same.
  62             if( mxCachedPrimitive.is() &&
  63                 (!mbOnlyRedrawWithSameTransform ||
  64                  maLastTransformation == aTotalTransform) )
  65             {
  66                 if( mxCachedPrimitive->redraw( rViewState ) ==
  67                     rendering::RepaintResult::REDRAWN )
  68                 {
  69                     // cached repaint succeeded, done.
  70                     return true;
  71                 }
  72             }
  73
  74             maLastTransformation = aTotalTransform;
  75
  76             // delegate rendering to derived classes
  77             return renderPrimitive( mxCachedPrimitive,
  78                                     rTransformation );
  79         }
  80     }
  81 }
  82
  83 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */