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