#ifndef __DW_IMGRENDERER_HH__ #define __DW_IMGRENDERER_HH__ #ifndef __INCLUDED_FROM_DW_CORE_HH__ # error Do not include this file directly, use "core.hh" instead. #endif namespace dw { namespace core { /** * \brief ... * * \sa \ref dw-images-and-backgrounds */ class ImgRenderer { public: virtual ~ImgRenderer () { } /** * \brief Called, when an image buffer is attached. * * This is typically the case when all meta data (size, depth) has been read. */ virtual void setBuffer (core::Imgbuf *buffer, bool resize = false) = 0; /** * \brief Called, when data from a row is available and has been copied into * the image buffer. * * The implementation will typically queue the respective area for drawing. */ virtual void drawRow (int row) = 0; /** * \brief Called, when all image data has been retrieved. * * The implementation may use this instead of "drawRow" for drawing, to * limit the number of draws. */ virtual void finish () = 0; /** * \brief Called, when there are problems with the retrieval of image data. * * The implementation may use this to indicate an error. */ virtual void fatal () = 0; }; /** * \brief Implementation of ImgRenderer, which distributes all calls * to a set of other implementations of ImgRenderer. * * The order of the call children is not defined, especially not * identical to the order in which they have been added. */ class ImgRendererDist: public ImgRenderer { lout::container::typed::HashSet > *children; public: inline ImgRendererDist () { children = new lout::container::typed::HashSet > (true); } ~ImgRendererDist () { delete children; } void setBuffer (core::Imgbuf *buffer, bool resize); void drawRow (int row); void finish (); void fatal (); void put (ImgRenderer *child) { children->put (new lout::object::TypedPointer (child)); } void remove (ImgRenderer *child) { lout::object::TypedPointer tp (child); children->remove (&tp); } }; } // namespace core } // namespace dw #endif // __DW_IMGRENDERER_HH__