tb_image_manager.h

// ================================================================================
// ==      This file is a part of Turbo Badger. (C) 2011-2014, Emil Segerås      ==
// ==                     See tb_core.h for more information.                    ==
// ================================================================================

#ifndef TB_IMAGE_MANAGER_H
#define TB_IMAGE_MANAGER_H

#include "tb_core.h"

#ifdef TB_IMAGE

#include "tb_linklist.h"
#include "tb_hashtable.h"
#include "tb_bitmap_fragment.h"
#include "tb_renderer.h"

namespace tb {

class TBImageManager;

class TBImageRep
{
    friend class TBImageManager;
    friend class TBImage;

    TBImageRep(TBImageManager *image_manager, TBBitmapFragment *fragment, uint32_t hash_key);

    void IncRef();
    void DecRef();

    int ref_count;
    uint32_t hash_key;
    TBImageManager *image_manager;
    TBBitmapFragment *fragment;
};

class TBImage
{
public:
    TBImage() : m_image_rep(nullptr) {}
    TBImage(TBImageRep *rep);
    TBImage(const TBImage &image);
    ~TBImage();

    bool IsEmpty() const;

    int Width() const;

    int Height() const;

    TBBitmapFragment *GetBitmap() const;

    const TBImage& operator = (const TBImage &image) { SetImageRep(image.m_image_rep); return *this; }
    bool operator == (const TBImage &image) const { return m_image_rep == image.m_image_rep; }
    bool operator != (const TBImage &image) const { return m_image_rep != image.m_image_rep; }
private:
    void SetImageRep(TBImageRep *image_rep);
    TBImageRep *m_image_rep;
};

class TBImageManager : private TBRendererListener
{
public:
    TBImageManager();
    ~TBImageManager();

    TBImage GetImage(const char *filename);

#ifdef TB_RUNTIME_DEBUG_INFO

    void Debug() { m_frag_manager.Debug(); }
#endif

    // Implementing TBRendererListener
    virtual void OnContextLost();
    virtual void OnContextRestored();
private:
    TBBitmapFragmentManager m_frag_manager;
    TBHashTableOf<TBImageRep> m_image_rep_hash;

    friend class TBImageRep;
    void RemoveImageRep(TBImageRep *image_rep);
};

extern TBImageManager *g_image_manager;

} // namespace tb

#endif // TB_IMAGE
#endif // TB_IMAGE_MANAGER_H