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#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 <lout::object::TypedPointer <ImgRenderer> >
*children;
public:
inline ImgRendererDist ()
{ children = new lout::container::typed::HashSet
<lout::object::TypedPointer <ImgRenderer> > (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 <ImgRenderer> (child)); }
void remove (ImgRenderer *child)
{ lout::object::TypedPointer <ImgRenderer> tp (child);
children->remove (&tp); }
};
} // namespace core
} // namespace dw
#endif // __DW_IMGRENDERER_HH__
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