cppcanvas/source/mtfrenderer/cachedprimitivebase.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  16  *   except in compliance with the License. You may obtain a copy of
  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  aViewState( mpCanvas->getViewState() );
  50             ::basegfx::B2DHomMatrix     aTotalTransform = ::canvas::tools::getViewStateTransform(
  51                                                     aViewState );
  52             aTotalTransform *= rTransformation;
  53
  54             // can we use the cached primitive? For that, it must be
  55             // present in the first place, and, if
  56             // mbOnlyRedrawWithSameTransform is true, the overall
  57             // transformation must be the same.
  58             if( mxCachedPrimitive.is() &&
  59                 (!mbOnlyRedrawWithSameTransform ||
  60                  maLastTransformation == aTotalTransform) )
  61             {
  62                 if( mxCachedPrimitive->redraw( aViewState ) ==
  63                     rendering::RepaintResult::REDRAWN )
  64                 {
  65                     // cached repaint succeeded, done.
  66                     return true;
  67                 }
  68             }
  69
  70             maLastTransformation = aTotalTransform;
  71
  72             // delegate rendering to derived classes
  73             return renderPrimitive( mxCachedPrimitive,
  74                                     rTransformation );
  75         }
  76 }
  77
  78 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */