CDrawBuffer.h

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/********************************************************************************
**  This file is part of the ICF Framework. Copyright (C) Witold Gantzke & Kirill Lepskiy
**  ICF Framework may be used under the terms of the LGPL License v. 2.1 by the Free Software Foundation.
********************************************************************************/
 
#ifndef iview_CDrawBuffer_included
#define iview_CDrawBuffer_included
 
 
// Qt includes
#include <QtGui/QPixmap>
#include <QtGui/QPainter>
 
 
// ICF includes
#include <ibase/ibase.h>
 
 
namespace iview
{
 
 
class CDrawBuffer: public QPixmap
{
public:
    typedef QPixmap BaseClass;
 
    CDrawBuffer();
 
    void Reset();
    
    bool IsCreated() const;
 
    void Create(const QPaintDevice& device, ibase::CSize size);
 
    void CopyRectTo(const i2d::CRect& source, QPainter& drawContext, istd::CIndex2d contextPos) const;
    
    void CopyRectTo(const i2d::CRect& source, QPaintDevice& device, istd::CIndex2d devicePos) const;
 
    QPainter& GetDrawContext();
 
protected:
    void EnsureDrawContext();
 
private:
    mutable std::unique_ptr<QPainter> m_drawContextPtr;
};
 
 
// inline methods
 
inline CDrawBuffer::CDrawBuffer()
{
}
 
 
inline QPainter& CDrawBuffer::GetDrawContext()
{
    EnsureDrawContext();
 
    Q_ASSERT(m_drawContextPtr != nullptr);
 
    return *m_drawContextPtr;
}
 
 
} // namespace iview
 
 
#endif // !iview_CDrawBuffer_included