cppcanvas/source/mtfrenderer/cachedprimitivebase.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  18  */
  19
  20 #pragma once
  21
  22 #include <com/sun/star/uno/Reference.hxx>
  23 #include <com/sun/star/rendering/XCachedPrimitive.hpp>
  24
  25 #include <basegfx/matrix/b2dhommatrix.hxx>
  26 #include <cppcanvas/canvas.hxx>
  27
  28 #include <action.hxx>
  29
  30 namespace basegfx { class B2DHomMatrix; }
  31
  32
  33 /* Definition of internal::CachedPrimitiveBase class */
  34
  35 namespace cppcanvas::internal
  36     {
  37         /** Base class providing cached re-rendering, if XCanvas
  38             returns XCachedPrimitive
  39
  40             Derive from this class and implement private render()
  41             method to perform the actual primitive rendering. Return
  42             cached primitive into given reference. Next time this
  43             class' public render() method gets called, the cached
  44             representation is taken.
  45          */
  46         class CachedPrimitiveBase : public Action
  47         {
  48         public:
  49             /** Constructor
  50
  51                 @param rCanvas
  52                 Canvas on which this primitive is to appear
  53
  54                 @param bOnlyRedrawWithSameTransform
  55                 When true, this class only reuses the cached
  56                 primitive, if the overall transformation stays the
  57                 same. Otherwise, repaints are always performed via the
  58                 cached primitive.
  59              */
  60             CachedPrimitiveBase( const CanvasSharedPtr& rCanvas,
  61                                  bool                   bOnlyRedrawWithSameTransform );
  62
  63             CachedPrimitiveBase(const CachedPrimitiveBase&) = delete;
  64             const CachedPrimitiveBase& operator=(const CachedPrimitiveBase&) = delete;
  65
  66             virtual bool render( const ::basegfx::B2DHomMatrix& rTransformation ) const override;
  67
  68         protected:
  69             using Action::render;
  70
  71         private:
  72             virtual bool renderPrimitive( css::uno::Reference< css::rendering::XCachedPrimitive >& rCachedPrimitive,
  73                                           const ::basegfx::B2DHomMatrix& rTransformation ) const = 0;
  74
  75             CanvasSharedPtr                                                 mpCanvas;
  76             mutable css::uno::Reference< css::rendering::XCachedPrimitive > mxCachedPrimitive;
  77             mutable ::basegfx::B2DHomMatrix                                 maLastTransformation;
  78             const bool                                                      mbOnlyRedrawWithSameTransform;
  79         };
  80
  81 }
  82
  83 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */