cppcanvas/source/mtfrenderer/transparencygroupaction.hxx

   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 #ifndef _CPPCANVAS_TRANSPARENCYGROUPACTION_HXX
  21 #define _CPPCANVAS_TRANSPARENCYGROUPACTION_HXX
  22
  23 #include <cppcanvas/canvas.hxx>
  24 #include <cppcanvas/renderer.hxx>
  25 #include <action.hxx>
  26
  27 #include <memory>
  28
  29 namespace basegfx {
  30     class B2DPoint;
  31     class B2DVector;
  32 }
  33
  34 class GDIMetaFile;
  35 class Gradient;
  36
  37
  38 /* Definition of internal::TransparencyGroupActionFactory class */
  39
  40 namespace cppcanvas
  41 {
  42     namespace internal
  43     {
  44         struct OutDevState;
  45
  46         typedef ::std::auto_ptr< GDIMetaFile >  MtfAutoPtr;
  47         typedef ::std::auto_ptr< Gradient >     GradientAutoPtr;
  48
  49         /** Transparency group action.
  50
  51             This action groups a bunch of other actions, to be
  52             rendered with the given transparency setting against the
  53             background.
  54
  55             Creates encapsulated converters between GDIMetaFile and
  56             XCanvas. The Canvas argument is deliberately placed at the
  57             constructor, to force reconstruction of this object for a
  58             new canvas. This considerably eases internal state
  59             handling, since a lot of the internal state (e.g. fonts,
  60             text layout) is Canvas-dependent.
  61          */
  62         class TransparencyGroupActionFactory
  63         {
  64         public:
  65             /** Create new transparency group action.
  66
  67                 @param rGroupMtf
  68                 Metafile that groups all actions to be rendered
  69                 transparent.
  70
  71                 @param rAlphaGradient
  72                 VCL gradient, to be rendered into the action's alpha
  73                 channel.
  74
  75                 @param rParms
  76                 Render parameters
  77
  78                 @param rDstPoint
  79                 Left, top edge of destination, in current state
  80                 coordinate system
  81
  82                 @param rDstSize
  83                 Size of the transparency group object, in current
  84                 state coordinate system.
  85              */
  86             static ActionSharedPtr createTransparencyGroupAction( MtfAutoPtr&                   rGroupMtf,
  87                                                                   GradientAutoPtr&              rAlphaGradient,
  88                                                                   const Renderer::Parameters&   rParms,
  89                                                                   const ::basegfx::B2DPoint&    rDstPoint,
  90                                                                   const ::basegfx::B2DVector&   rDstSize,
  91                                                                   const CanvasSharedPtr&        rCanvas,
  92                                                                   const OutDevState&            rState );
  93
  94         private:
  95             // static factory, disable big four
  96             TransparencyGroupActionFactory();
  97             ~TransparencyGroupActionFactory();
  98             TransparencyGroupActionFactory(const TransparencyGroupActionFactory&);
  99             TransparencyGroupActionFactory& operator=( const TransparencyGroupActionFactory& );
 100         };
 101     }
 102 }
 103
 104 #endif /*_CPPCANVAS_TRANSPARENCYGROUPACTION_HXX */
 105
 106 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */