Avis sur le système de signaux d'un GUI/Comment éviter proprement le GodObject ?

Version imprimable

Bonjour, j'ai écrit un système de callbacks pour un futur GUI et j'aimerais avoir votre avis/critiques.
De plus, j'ai un doute sur la création d'un GodObject (il y a eut une discussion dessus sur ce forum il n'y a pas si lontemps et j'ai crut comprendre que s'était a proscrire) et la façon d'éviter sa création.

Je vous montre le code (il n'est peut être pas parfaitement const_correct, il fait peut être parfois des copies en trop (manque de passage par référence ?)... n'hésitez pas à l'indiquer)

Il n'a pas de dépendance sur boost mais sur c++0x (avec gcc 4.5 minimum) et la SDL(Image,gfx).

Attention : ce code ne compile pas en -pedantic-errors

Le main (Il se contente de redimensionner une image de fond quand l'écran est redimensionné).

Code:

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#include "Evenement.hpp"
#include "Callback.hpp"
#include "binding.hpp"
#include "app.hpp"
#include "Object.hpp"
#include <iostream>
#include "Image.h"
 
using namespace std;
 
int main(int argc, char**argv)
{
    app appli;
    Image img("ciel.bmp");
    SDL_Surface*screen=appli.get_screen();
    Image img2(img.copier_redim(640u,480u));
    img2.blit(screen);
    SDL_Flip(screen);
    Image(Image::*cop)(unsigned int,unsigned int)const =&Image::copier_redim;
    void(Image::*blit)(SDL_Surface*, unsigned int, unsigned int)const =&Image::blit;
    appli.add_event("resize",Evenement<int,int>::make_callback(img2,make_member(img,cop),placeholders::_1, placeholders::_2));
    appli.add_event("resize",Evenement<int,int>::make_callback_void(make_member(img2,blit), screen, 0,0));
    appli.add_event("resize",Evenement<int,int>::make_callback_void(SDL_Flip, screen));
    appli.wait();
    SDL_Quit();
    return 0;
}

binding.hpp

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#ifndef BINDING_HPP_INCLUDED
#define BINDING_HPP_INCLUDED
 
#include <functional>
#include <tuple>
 
//Attention : ce fichier est totalement illisible
 
template<typename T, typename R, typename ...Args>
class member_function
{
    private :
        T* obj;
        R(T::*function)(Args...);
    public :
        member_function(T* ob, R(T::*func)(Args...)): obj(ob), function(func){}
        R operator()(Args...arg)
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function<T,R,Args...> make_member(T* obj, R(T::*func)(Args...))
{
    return member_function<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function<T,R,Args...> make_member(T& obj, R(T::*func)(Args...))
{
    return member_function<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_3
{
    private :
        const T* obj;
        R(T::*function)(Args...);
    public :
        member_function_3(const T* ob, R(T::*func)(Args...)): obj(ob), function(func){}
        R operator()(Args...arg)
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_3<T,R,Args...> make_member(const T* obj, R(T::*func)(Args...))
{
    return member_function_3<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function_3<T,R,Args...> make_member(const T& obj, R(T::*func)(Args...))
{
    return member_function_3<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_4
{
    private :
        const T* const obj;
        R(T::*function)(Args...);
    public :
        member_function_4(const T* const ob, R(T::*func)(Args...)): obj(ob), function(func){}
        R operator()(Args...arg)
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_4<T,R,Args...> make_member(const T* const obj, R(T::*func)(Args...))
{
    return member_function_4<T,R,Args...>(obj, func);
}
 
 
template<typename T, typename R, typename ...Args>
class member_function_2
{
    private :
        T* obj;
        R(T::*function)(Args...)const;
    public :
        member_function_2(T* ob, R(T::*func)(Args...)const): obj(ob), function(func){}
        R operator()(Args...arg)
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_2<T,R,Args...> make_member(T* obj, R(T::*func)(Args...)const)
{
    return member_function_2<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function_2<T,R,Args...> make_member(T& obj, R(T::*func)(Args...)const)
{
    return member_function_2<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_5
{
    private :
        const T* obj;
        R(T::*function)(Args...)const;
    public :
        member_function_5(const T* ob, R(T::*func)(Args...)const): obj(ob), function(func){}
        R operator()(Args...arg)
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_5<T,R,Args...> make_member(const T* obj, R(T::*func)(Args...)const)
{
    return member_function_5<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function_5<T,R,Args...> make_member(const T& obj, R(T::*func)(Args...)const)
{
    return member_function_5<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_6
{
    private :
        const T* const obj;
        R(T::*function)(Args...)const;
    public :
        member_function_6(const T* const ob, R(T::*func)(Args...)const): obj(ob), function(func){}
        R operator()(Args...arg)
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_6<T,R,Args...> make_member(const T* const obj, R(T::*func)(Args...)const)
{
    return member_function_6<T,R,Args...>(obj, func);
}
 
 
template<typename R,unsigned int N>
struct get_args_impl_2
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static R apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
        return get_args_impl_2<R,N-1>::apply(function, E, std::get<N-1>(E), finis...);
    }
};
 
template<typename R>
struct get_args_impl_2<R,0>
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static R apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
             return function(finis...);
    }
};
 
template<typename R,unsigned int N>
struct get_args_impl
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static R apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        return get_args_impl<R,N-1>::apply(function, t, E, std::get<N-1>(t), argsfait...);
    }
};
 
template<typename R>
struct get_args_impl<R,0>
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static R apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        return get_args_impl_2<R,sizeof...(ArgsE)>::apply(std::bind(function, argsfait...), E);
    }
};
 
template<typename R,typename Fc,typename ...ArgsE>
struct stupid
{
    template<typename ...Args>
    static R my_bind(Fc function,const std::tuple<Args...>& t, std::tuple<ArgsE...> te)
    {
        return get_args_impl<R,sizeof...(Args)>::apply(function, t, te);
    }
};
 
 
 
 
template<unsigned int N>
struct get_args_impl_2_v2
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static void apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
        get_args_impl_2_v2<N-1>::apply(function, E, std::get<N-1>(E), finis...);
    }
};
 
template<>
struct get_args_impl_2_v2<0>
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static void apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
             function(finis...);
    }
};
 
template<unsigned int N>
struct get_args_impl_v2
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static void apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        get_args_impl_v2<N-1>::apply(function, t, E, std::get<N-1>(t), argsfait...);
    }
};
 
template<>
struct get_args_impl_v2<0>
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static void apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        get_args_impl_2_v2<sizeof...(ArgsE)>::apply(std::bind(function, argsfait...), E);
    }
};
 
template<typename Fc,typename ...ArgsE>
struct stupid_v2
{
    template<typename ...Args>
    static void my_bind(Fc function,const std::tuple<Args...>& t, std::tuple<ArgsE...> te)
    {
        get_args_impl_v2<sizeof...(Args)>::apply(function, t, te);
    }
};
 
 
#endif // BINDING_HPP_INCLUDED

Callback.hpp

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#ifndef CALLBACK_HPP_INCLUDED
#define CALLBACK_HPP_INCLUDED
 
#include <functional>
 
class Callback
{
    private :
        std::function<void(void*)> function;
    public :
        inline Callback(std::function<void(void*)> fc) : function(fc)
        {}
        inline void operator()(void*even) const
        {
            function(even);
        }
};
 
#endif // CALLBACK_HPP_INCLUDED

app.hpp (dans le cas d'un GodObject, on la ferait hérité de Object.hpp)

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#ifndef APP_HPP_INCLUDED
#define APP_HPP_INCLUDED
 
#include <utility>
#include <iostream>
#include <string>
#include <vector>
#include <unordered_map>
#include "Callback.hpp"
#include "Evenement.hpp"
#include <SDL/SDL.h>
 
class app
{
    private :
        std::unordered_map<std::string,std::vector<Callback>>Callbacks;
        inline bool has_key(std::string key)const;
        void handle_event(std::string key, void*even)const;
        bool exit;
        SDL_Surface*screen;
    public :
        app();
        template<typename ...Args>
        inline void emit(std::string key, Evenement<Args...> even)const;
        inline void emit(std::string key)const;
        void wait();
        inline void quit();
        bool add_event(std::string key, Callback fc);
        bool add_event(std::string key, Callback fc, unsigned int pos);
        void show_callbacks();//Sert a debbuger
        inline const std::unordered_map<std::string,std::vector<Callback>>& get_callbacks()const;
        SDL_Surface*get_screen()const;
        ~app();
};
 
#endif // APP_HPP_INCLUDED

Object.hpp (Sera soit un GodObject ou n'existera pas en tant que tel mais en tant que 2 classes séparées : GraphicObject et SoundObject)

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#ifndef OBJECT_HPP_INCLUDED
#define OBJECT_HPP_INCLUDED
 
#include "app.hpp"
 
class Object
{
    private :
        std::unordered_map<std::string,std::vector<Callback>>Callbacks;
        inline bool has_key(std::string key)const;
        void handle_event(std::string key, void*even)const;
        app*application;
    public :
        Object(app& a);
        template<typename ...Args>
        inline void emit(std::string key, Evenement<Args...> even)const;
        inline void emit(std::string key)const;
        bool add_event(std::string key, Callback fc);
        bool add_event(std::string key, Callback fc, unsigned int pos);
        inline const std::unordered_map<std::string,std::vector<Callback>>& get_callbacks()const;
};
 
#endif // OBJECT_HPP_INCLUDED

Image.h (wrapper a SDL_Surface)

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#ifndef IMAGE_H_INCLUDED
#define IMAGE_H_INCLUDED
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <vector>
#include <string>
 
class Image
{
    private :
        SDL_Surface *img;
    public :
        Image (SDL_Surface *image=NULL, bool copier=true);
        Image (const char *chm_img);
        Image (const Image &image);
        ~Image ();
 
        void blit (SDL_Surface *image, unsigned int x=0, unsigned int y=0) const;
        void blit (Image &image, unsigned int x=0, unsigned int y=0) const;
 
        void redim (double rapport);
        void redim (double rapport_x, double rapport_y);
        void redim (unsigned int nouv_taille);
        void redim (unsigned int nouv_l, unsigned int nouv_h);
 
        Image copier_redim (double rapport) const ;
        Image copier_redim (double rapport_x, double rapport_y) const;
        Image copier_redim (unsigned int nouv_taille) const;
        Image copier_redim_h (unsigned int nouv_taille) const;
        Image copier_redim (unsigned int nouv_l, unsigned int nouv_h) const;
 
        void set_transparency(unsigned int);
        void set_transparency(unsigned int alpha, SDL_Rect zone);
        inline const SDL_Surface *obt_image () const
        { return img; }
 
        void delete_color(std::vector<Uint32> col);
        void delete_color(Uint32 col);
 
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b, Uint8 a));
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b));
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b, Uint8 a, unsigned int x, unsigned int y));
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b, unsigned int x, unsigned int y));
 
 
        void delete_transparent_borders();
        void keep_rectangle(unsigned int ,unsigned int , unsigned int , unsigned int);
        Image operator= (SDL_Surface *image);
        Image operator= (const Image &image);
        //bool saveAsPNG(const std::string filename);
        void set_alpha_perpixel();
 
        void set_color(unsigned int x, unsigned int y, Uint32 col);
        void set_color(unsigned int x, unsigned int y, Uint8 r, Uint8 v, Uint8 b, Uint8 a=0);
 
        Uint32 get_color(unsigned int x, unsigned int y)const;
        void get_color(unsigned int x, unsigned int y, Uint8& r, Uint8& v, Uint8& b, Uint8& a)const;
};
 
 
 
#endif // IMAGE_H_INCLUDED

app.cpp

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#include "app.hpp"
#include "test_functions.hpp"
 
 
app::~app()
{
    quit();
}
 
SDL_Surface* app::get_screen()const
{
    return screen;
}
 
const std::unordered_map<std::string,std::vector<Callback>>& app::get_callbacks()const
{
    return Callbacks;
}
 
bool app::has_key(std::string key)const
{
    return !(Callbacks.find(key)==Callbacks.end());
}
void app::handle_event(std::string key, void*even)const
{
    const std::vector<Callback>&vect=(Callbacks.find(key))->second;
    for(unsigned int i=0;i<vect.size();i++)
        (vect[i])(even);
}
app::app()
{
    SDL_Init( SDL_INIT_EVERYTHING );
    freopen("CON", "w", stdout);//"Fait marcher" la console
    freopen("CON", "r", stdin);
    freopen("CON", "w", stderr);
    screen=SDL_SetVideoMode( 640, 480, 32, SDL_HWSURFACE|SDL_RESIZABLE );
    add_event("resize",Evenement<int,int>::make_callback(screen,SDL_SetVideoMode, std::placeholders::_1, std::placeholders::_2,32, SDL_HWSURFACE|SDL_RESIZABLE));
    add_event("resize",Evenement<int,int>::make_callback_void(SDL_Flip, screen));
    add_event("delete_screen",Evenement<>::make_callback_void(SDL_FreeSurface,screen));
    add_event("sdl_quit",Evenement<>::make_callback_void(SDL_FreeSurface,screen));
    add_event("sdl_quit",Evenement<>::make_callback_void(make_member(this,&app::quit)));
}
template<typename ...Args>
void app::emit(std::string key, Evenement<Args...> even)const
{
    if(has_key(key))
        handle_event(key,(void*)(&even));
}
void app::emit(std::string key)const
{
    if(has_key(key))
        handle_event(key,NULL);
}
void app::wait()
{
    SDL_Event event;
    exit=false;
    while(!exit)
    {
        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_VIDEORESIZE :
                emit("resize", Evenement<int,int>(event.resize.w,event.resize.h));
                break;
            case SDL_KEYDOWN :
                emit("keyboard", Evenement<bool, SDL_keysym>(true,event.key.keysym));
                break;
            case SDL_KEYUP :
                emit("keyboard", Evenement<bool, SDL_keysym>(false,event.key.keysym));
                break;
            case SDL_MOUSEBUTTONDOWN :
                emit("mouse_button", Evenement<bool, Uint8,Uint16,Uint16>(true,event.button.which,event.button.x,event.button.y));
                break;
            case SDL_MOUSEBUTTONUP :
                emit("mouse_button", Evenement<bool, Uint8,Uint16,Uint16>(false,event.button.which,event.button.x,event.button.y));
                break;
            case SDL_MOUSEMOTION :
                emit("mouse_motion", Evenement<bool, Uint16,Uint16,Uint16,Uint16>(event.motion.state==SDL_PRESSED,event.motion.x,event.motion.y,event.motion.xrel,event.motion.yrel));
                break;
            case SDL_VIDEOEXPOSE :
                emit("video_expose");
                break;
            case SDL_ACTIVEEVENT :
                emit("window_sate",Evenement<bool>(event.active.gain==1));
                break;
            case SDL_QUIT :
                emit("sdl_quit");
                break;
        }
    }
}
void app::quit()
{
    exit=true;
}
bool app::add_event(std::string key, Callback fc)
{
    if(has_key(key))
    {
        std::vector<Callback>& vect=Callbacks[key];
        vect.push_back(fc);
        return false;
    }
    else
    {
        std::vector<Callback> vect(1,fc);
        Callbacks.insert(std::pair<std::string,std::vector<Callback>>(key,vect));
        return true;
    }
}
bool app::add_event(std::string key, Callback fc, unsigned int pos)
{
    if(has_key(key))
    {
        std::vector<Callback>& vect=Callbacks[key];
        if(pos<vect.size())
            vect.insert(vect.begin()+pos,fc);
        else
            vect.push_back(fc);
        return false;
    }
    else
    {
        std::vector<Callback> vect(1,fc);
        Callbacks.insert(std::pair<std::string,std::vector<Callback>>(key,vect));
        return true;
    }
}
void app::show_callbacks()
{
    std::cout<<"showing callbacks";
    std::unordered_map<std::string,std::vector<Callback>>::iterator it;
    for(it=Callbacks.begin();it!=Callbacks.end();it++)
    {
        std::cout<<"\n"<<(*it).first<<" nb_func= "<<(*it).second.size();
    }
}

Object.cpp

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#include "Object.hpp"
 
const std::unordered_map<std::string,std::vector<Callback>>& Object::get_callbacks()const
{
    return Callbacks;
}
 
bool Object::has_key(std::string key)const
{
    return !(Callbacks.find(key)==Callbacks.end());
}
void Object::handle_event(std::string key, void*even)const
{
    const std::vector<Callback>& vect=(Callbacks.find(key))->second;
    for(unsigned int i=0;i<vect.size();i++)
    {
        (vect[i])(even);
    }
}
Object::Object(app& a)
{
    application=&a;
}
template<typename ...Args>
void Object::emit(std::string key, Evenement<Args...> even)const
{
    if(has_key(key))
        handle_event(key,(void*)(&even));
}
void Object::emit(std::string key)const
{
    if(has_key(key))
        handle_event(key,NULL);
}
bool Object::add_event(std::string key, Callback fc)
{
    if(has_key(key))
    {
        std::vector<Callback>& vect=Callbacks[key];
        vect.push_back(fc);
        return false;
    }
    else
    {
        std::vector<Callback> vect(1,fc);
        Callbacks.insert(std::pair<std::string,std::vector<Callback>>(key,vect));
        return true;
    }
}
 
bool Object::add_event(std::string key, Callback fc, unsigned int pos)
{
    if(has_key(key))
    {
        std::vector<Callback>& vect=Callbacks[key];
        if(pos<vect.size())
            vect.insert(vect.begin()+pos,fc);
        else
            vect.push_back(fc);
        return false;
    }
    else
    {
        std::vector<Callback> vect(1,fc);
        Callbacks.insert(std::pair<std::string,std::vector<Callback>>(key,vect));
        return true;
    }
}

Image.cpp (Pas encore optimisé ne fouillait pas dedans, ce n'ai pas la partie qui m'interesse)

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#include "Image.h"
#include <SDL/SDL_image.h>
#include <iostream>
#include <windows.h>
#include <SDL/SDL_rotozoom.h>
#include <limits.h>
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
 
    #define MASQUE_ROUGE 0xff000000
    #define MASQUE_VERT  0x00ff0000
    #define MASQUE_BLEU  0x0000ff00
    #define MASQUE_ALPHA 0x000000ff
 
#else
 
    #define MASQUE_ROUGE 0x000000ff
    #define MASQUE_VERT  0x0000ff00
    #define MASQUE_BLEU  0x00ff0000
    #define MASQUE_ALPHA 0xff000000
 
#endif
 
 
Image::Image (SDL_Surface *image, bool copier)
{
    if (image)
    {
        if (copier)
            img=SDL_DisplayFormatAlpha(image);
        else
            img=image;
    }
    else
    {
        img=SDL_CreateRGBSurface(SDL_HWSURFACE, 100,100,32,0,0,0,0);
        SDL_SetAlpha (img,SDL_SRCALPHA,0);
    }
}
Image::Image (const char *chm_img)
{
    SDL_Surface*tmp=IMG_Load(chm_img);
    if (!tmp)
    {
        img=SDL_CreateRGBSurface(SDL_HWSURFACE, 100,100,32,0,0,0,0);
        SDL_SetAlpha (img,SDL_SRCALPHA,0);
    }
    else
    {
        img=SDL_DisplayFormatAlpha( tmp );
        SDL_FreeSurface(tmp);
    }
}
 
Image::Image (const Image &image)
{
    img=SDL_DisplayFormatAlpha( image.img );
 
}
 
Image::~Image ()
{
    SDL_FreeSurface (img);
}
 
void Image::blit (SDL_Surface *image, unsigned int x, unsigned int y) const
{
    if (image)
    {
        SDL_Rect tmp={(Uint16)x,(Uint16)y,0,0};
        SDL_BlitSurface (img,NULL,image,&tmp);
    }
}
void Image::blit (Image &image, unsigned int x, unsigned int y)const
{
    SDL_Rect tmp={(Uint16)x,(Uint16)y,(Uint16)img->w,(Uint16)img->h};
    SDL_BlitSurface (img,NULL,image.img,&tmp);
}
 
void Image::redim (double rapport)
{ redim (rapport,rapport); }
void Image::redim (double rapport_x, double rapport_y)
{
    if(img->format->alpha==255 || img->format->Amask!=0)
    {
        SDL_Surface *tampon=zoomSurface(img,rapport_x,rapport_y,0);
        SDL_FreeSurface (img);
        img=tampon;
    }
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        SDL_Surface *tampon=zoomSurface(tmp,rapport_x,rapport_y,0);
        SDL_FreeSurface (img);
        SDL_FreeSurface (tmp);
        img=tampon;
    }
}
void Image::redim (unsigned int nouv_taille)
{ redim (nouv_taille,img->h*nouv_taille/img->w); }
 
 
void Image::redim (unsigned int nouv_l, unsigned int nouv_h)
{
    if(img->format->alpha==255 || img->format->Amask!=0)
    {
        SDL_Surface *tampon=zoomSurface(img,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
        SDL_FreeSurface (img);
        img=tampon;
    }
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        SDL_Surface *tampon=zoomSurface(tmp,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
        SDL_FreeSurface (img);
        SDL_FreeSurface (tmp);
        img=tampon;
    }
}
 
Image Image::copier_redim (double rapport)const
{ return copier_redim(rapport,rapport); }
Image Image::copier_redim (double rapport_x, double rapport_y)const
{
    SDL_Surface*tampon;
    if(img->format->alpha==255 || img->format->Amask!=0)
        tampon=zoomSurface(img,rapport_x,rapport_y,0);
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        tampon=zoomSurface(tmp,rapport_x,rapport_y,0);
        SDL_FreeSurface (tmp);
    }
    //Image tmp(tampon,false);
    Image tmp(tampon,true);
    SDL_FreeSurface(tampon);
    return tmp;
}
Image Image::copier_redim (unsigned int nouv_taille)const
{ return copier_redim(nouv_taille,img->h*nouv_taille/img->w); }
 
Image Image::copier_redim_h (unsigned int nouv_taille)const
{ return copier_redim(img->w*nouv_taille/img->h,nouv_taille); }
 
Image Image::copier_redim (unsigned int nouv_l, unsigned int nouv_h)const
{
    SDL_Surface*tampon;
    if(img->format->alpha==255 || img->format->Amask!=0)
        tampon=zoomSurface(img,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        tampon=zoomSurface(tmp,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
        SDL_FreeSurface (tmp);
    }
    //Image tmp(tampon,false);
    Image tmp(tampon,true);
    SDL_FreeSurface(tampon);
    return tmp;
}
 
Image Image::operator= (SDL_Surface *image)
{
    if (image)
    {
        SDL_FreeSurface (img);
        img=SDL_DisplayFormatAlpha(image);
    }
    return *this;
}
/*Image Image::operator= (Image &image)
{
    SDL_FreeSurface (img);
    img=SDL_CreateRGBSurface(SDL_HWSURFACE,image.img->w,image.img->h,fenetre->ecran->format->BitsPerPixel,0,0,0,0);
    SDL_BlitSurface (image.img,NULL,img,NULL);
    return *this;
}*/
 
Image Image::operator= (const Image& image)
{
    SDL_FreeSurface (img);
    img=SDL_DisplayFormatAlpha(image.img);
    return *this;
}
 
Uint32 obtenirPixel(const SDL_Surface *surface, unsigned int x, unsigned int y)
{
    /*nbOctetsParPixel représente le nombre d'octets utilisés pour stocker un pixel.
    En multipliant ce nombre d'octets par 8 (un octet = 8 bits), on obtient la profondeur de couleur
    de l'image : 8, 16, 24 ou 32 bits.*/
    int nbOctetsParPixel = surface->format->BytesPerPixel;
    /* Ici p est l'adresse du pixel que l'on veut connaitre */
    /*surface->pixels contient l'adresse du premier pixel de l'image*/
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * nbOctetsParPixel;
 
    /*Gestion différente suivant le nombre d'octets par pixel de l'image*/
    switch(nbOctetsParPixel)
    {
        case 1:
            return *p;
 
        case 2:
            return *(Uint16 *)p;
 
        case 3:
            /*Suivant l'architecture de la machine*/
            if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
                return p[0] << 16 | p[1] << 8 | p[2];
            else
                return p[0] | p[1] << 8 | p[2] << 16;
 
        case 4:
            return *(Uint32 *)p;
 
        /*Ne devrait pas arriver, mais évite les erreurs*/
        default:
            return 0;
    }
}
 
void definirPixel(SDL_Surface *surface, unsigned int x, unsigned int y, Uint32 pixel)
{
    /*nbOctetsParPixel représente le nombre d'octets utilisés pour stocker un pixel.
    En multipliant ce nombre d'octets par 8 (un octet = 8 bits), on obtient la profondeur de couleur
    de l'image : 8, 16, 24 ou 32 bits.*/
    int nbOctetsParPixel = surface->format->BytesPerPixel;
    /*Ici p est l'adresse du pixel que l'on veut modifier*/
    /*surface->pixels contient l'adresse du premier pixel de l'image*/
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * nbOctetsParPixel;
 
    /*Gestion différente suivant le nombre d'octets par pixel de l'image*/
    switch(nbOctetsParPixel)
    {
        case 1:
            *p = pixel;
            break;
 
        case 2:
            *(Uint16 *)p = pixel;
            break;
 
        case 3:
            /*Suivant l'architecture de la machine*/
            if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
            {
                p[0] = (pixel >> 16) & 0xff;
                p[1] = (pixel >> 8) & 0xff;
                p[2] = pixel & 0xff;
            }
            else
            {
                p[0] = pixel & 0xff;
                p[1] = (pixel >> 8) & 0xff;
                p[2] = (pixel >> 16) & 0xff;
            }
            break;
 
        case 4:
            *(Uint32 *)p = pixel;
            break;
    }
}
 
 
 
void Image::delete_color(Uint32 col)
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs,rc,vc,bc;
        SDL_GetRGB(col, img->format, &rc, &vc, &bc);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        if(SDL_MUSTLOCK(tmp))
        {
            for(x=0;x<tmp->w;x++)
            {
                for(y=0;y<tmp->h;y++)
                {
                    pixel=obtenirPixel(tmp,x,y);
                    SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(tmp,x,y,invisible);
                }
            }
            SDL_UnlockSurface(tmp);
        }
        else
        {
            for(x=0;x<tmp->w;x++)
            {
                for(y=0;y<tmp->h;y++)
                {
                    pixel=obtenirPixel(tmp,x,y);
                    SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(tmp,x,y,invisible);
                }
            }
        }
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs,rc,vc,bc;
        SDL_GetRGB(col, img->format, &rc, &vc, &bc);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        if(SDL_MUSTLOCK(img))
        {
            SDL_LockSurface(img);
            for(x=0;x<img->w;x++)
            {
                for(y=0;y<img->h;y++)
                {
                    pixel=obtenirPixel(img,x,y);
                    SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(img,x,y,invisible);
                }
            }
            SDL_UnlockSurface(img);
        }
        else
        {
            for(x=0;x<img->w;x++)
            {
                for(y=0;y<img->h;y++)
                {
                    pixel=obtenirPixel(img,x,y);
                    SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(img,x,y,invisible);
                }
            }
        }
    }
}
 
 
 
void Image::delete_color(std::vector<Uint32>col)
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y,i;
        Uint8 rs,vs,bs,rc[col.size()],vc[col.size()],bc[col.size()];
        for(i=0;i<col.size();i++)
            SDL_GetRGB(col[i], img->format, &rc[i], &vc[i], &bc[i]);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                for(i=0;i<col.size();i++)
                {
                    if(rs==rc[i] && vc[i]==vs && bc[i]==bs)
                    {
                        definirPixel(tmp,x,y,invisible);
                        break;
                    }
                }
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y,i;
        Uint8 rs,vs,bs,rc[col.size()],vc[col.size()],bc[col.size()];
        for(i=0;i<col.size();i++)
            SDL_GetRGB(col[i], img->format, &rc[i], &vc[i], &bc[i]);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                for(i=0;i<col.size();i++)
                {
                    if(rs==rc[i] && vc[i]==vs && bc[i]==bs)
                    {
                        definirPixel(img,x,y,invisible);
                        break;
                    }
                }
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
 
void Image::set_transparency(unsigned int i)
{
    if(img->format->Amask==0)
        SDL_SetAlpha(img,SDL_SRCALPHA,i);
    else
    {
        unsigned int x,y;
        Uint32 pixel,pixel1;
        Uint8 rs,bs,vs,as;
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixel, img->format,&rs,&vs,&bs,&as);
                if(as!=0)
                {
                    pixel1=SDL_MapRGBA(img->format,rs,vs,bs,i);
                    definirPixel(img,x,y,pixel1);
                }
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
void Image::set_transparency(unsigned int i, SDL_Rect zone)
{
    set_alpha_perpixel();
    SDL_LockSurface(img);
    Uint8 r,v,b,a;
    unsigned int x,y;
    Uint32 pixel;
    for(x=zone.x;x<=zone.x+zone.w;x++)
    {
        for(y=zone.y;y<=zone.y+zone.h;y++)
        {
            pixel=obtenirPixel(img,x,y);
            SDL_GetRGBA(pixel, img->format,&r,&v,&b,&a);
            if(a!=0)
                definirPixel(img,x,y,SDL_MapRGBA(img->format,r,v,b,i));
        }
    }
    SDL_UnlockSurface(img);
}
 
 
 
 
 
 
 
 
 
 
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8,Uint8))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGBA(pixel, tmp->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixel, img->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8,Uint8, unsigned int, unsigned int))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGBA(pixel, tmp->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as,x,y))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixel, img->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as,x,y))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8,unsigned int, unsigned int))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs,x,y))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs,x,y))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
 
void Image::keep_rectangle(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2)
{
    if(img->format->Amask==0)
    {
        SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,x2-x1,y2-y1,32,0,0,0,0);
        SDL_Rect rect={(Uint16)x1,(Uint16)y1,(Uint16)(x2-1),(Uint16)(y2-1)};
        SDL_BlitSurface(img,&rect,tampon,NULL);
        tampon->format->alpha=img->format->alpha;
        SDL_FreeSurface(img);
        img=tampon;
    }
    else
    {
        SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,x2-x1,y2-y1,img->format->BitsPerPixel,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        unsigned int x,y;
        Uint8 r,v,b,a;
        Uint32 pixelS,pixel;
        SDL_LockSurface(img);
        SDL_LockSurface(tampon);
        for(x=x1;x<x2;x++)
        {
            for(y=y1;y<y2;y++)
            {
                pixelS=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixelS,img->format,&r,&v,&b,&a);
                pixel=SDL_MapRGBA(tampon->format,r,v,b,a);
                definirPixel(tampon,x-x1,y-y1,pixel);
            }
        }
        SDL_UnlockSurface(img);
        SDL_UnlockSurface(tampon);
        SDL_FreeSurface(img);
        img=tampon;
    }
}
 
 
 
void Image::delete_transparent_borders()
{
    unsigned int i,j;
    Uint32 Pixel;
    Uint8 t1,t2,t3,a;
    bool empty=true;
    SDL_LockSurface(img);
    for(i=0;i<img->h&&empty;i++)
    {
        for(j=0;j<img->w;j++)
        {
            Pixel=obtenirPixel(img,j,i);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(0,i-1,img->w,img->h);
    empty=true;
    SDL_LockSurface(img);
    for(i=0;i<img->w&&empty;i++)
    {
        for(j=0;j<img->h;j++)
        {
            Pixel=obtenirPixel(img,i,j);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(i-1,0,img->w,img->h);
    empty=true;
    SDL_LockSurface(img);
    for(i=img->h-1;i!=INT_MAX&&empty;i--)
    {
        for(j=0;j<img->w;j++)
        {
            Pixel=obtenirPixel(img,j,i);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(0,0,img->w,i+1);
    empty=true;
    SDL_LockSurface(img);
    for(i=img->w-1;i!=INT_MAX&&empty;i--)
    {
        for(j=0;j<img->h;j++)
        {
            Pixel=obtenirPixel(img,i,j);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(0,0,i+1,img->h);
 
}
 
 
 
 
 
 
 
 
 
 
Uint32 getPixel(SDL_Surface *surface, int x, int y)
{
    int bpp = surface->format->BytesPerPixel;
    //Here p is the address to the pixel we want to retrieve
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
 
    switch(bpp) {
    case 1:
        return *p;
 
    case 2:
        return *(Uint16 *)p;
 
    case 3:
        if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
            return p[0] << 16 | p[1] << 8 | p[2];
        else
            return p[0] | p[1] << 8 | p[2] << 16;
 
    case 4:
        return *(Uint32 *)p;
 
    default:
        return 0; //shouldn't happen, but avoids warnings
    }
}
 
using namespace std;
 
/*bool Image::saveAsPNG(string fileName)
{
    set_alpha_perpixel();
    SDL_Surface*toSave=img;
 
     FILE* file = fopen(fileName.c_str(), "wb");
 
     if(!file)
     {
          cout<<"Impossible d'ouvrir le fichier "<<fileName<<" pour enregistrer le screenshot"<<endl;
          return false;
     }
 
     png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
     if(!png_ptr)
     {
          fclose(file);
          cout<<"Error1";
          return false;
     }
 
     png_infop   png_info = png_create_info_struct(png_ptr);
 
     if(!png_info)
     {
          png_destroy_write_struct(&png_ptr, &png_info);
          fclose(file);
          cout<<"Error2";
          return false;
     }
 
     if(setjmp(png_jmpbuf(png_ptr)))
     {
          png_destroy_write_struct(&png_ptr, &png_info);
          fclose(file);
          cout<<"Error3";
          return false;
     }
 
     //données de l'image
     png_init_io(png_ptr, file);
 
     // type de compression
     png_set_compression_level(png_ptr, Z_BEST_SPEED);
 
     // infos de l'image
     png_set_IHDR(png_ptr, png_info, static_cast<png_uint_32>(toSave->w),
                  static_cast<png_uint_32>(toSave->h), 8,
                  PNG_COLOR_TYPE_RGBA, PNG_INTERLACE_NONE,
                  PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
     // date de création
     png_time  modtime;
     png_convert_from_time_t(&modtime, time(NULL));
     png_set_tIME(png_ptr, png_info, &modtime);
 
     // commentaires de l'image
     png_text text[6];
 
     text[0].key = "Title";
     text[0].text = "";
     text[0].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[1].key = "Author";
     text[1].text = "";
     text[1].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[2].key = "Description";
     text[2].text = "";
     text[2].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[3].key = "Copyright";
     text[3].text = "";
     text[3].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[4].key = "E-mail";
     text[4].text = "";
     text[4].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[5].key = "Url";
     text[5].text = "";
     text[5].compression = PNG_TEXT_COMPRESSION_NONE;
 
     png_set_text(png_ptr, png_info, text, 6);
 
     // écriture de l'image
     png_write_info(png_ptr, png_info);
 
     png_byte* line;
     line = new png_byte[toSave->w * 4];
     Uint8 r,v,b,a;
     SDL_LockSurface(toSave);
     for(int i = 0; i < toSave->h; ++i)
     {
          for(int p = 0, j = 0; j < toSave->w; ++j)
          {
               // extraction du pixel de la SDL_Surface*
               Uint32 pixel = getPixel(toSave, j, i);
               SDL_GetRGBA(pixel,toSave->format,&r,&v,&b,&a);
               line[p++]=r;
               line[p++]=v;
               line[p++]=b;
               line[p++]=a;
          }
          // écriture de la ligne dans le fichier
          png_write_row(png_ptr, line);
     }
     SDL_UnlockSurface(toSave);
     delete[] line;
 
     png_write_end(png_ptr, png_info);
 
     png_destroy_write_struct(&png_ptr, &png_info);
     fclose(file);
     return true;
}*/
 
void Image::set_alpha_perpixel()
{
    if(img->format->Amask==0)
    {
        if(img->format->alpha==0)
        {
            SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,img->format->BitsPerPixel,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
            SDL_BlitSurface(img,NULL,tampon,NULL);
            SDL_FreeSurface(img);
            img=tampon;
        }
        else
        {
            SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,img->format->BitsPerPixel,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
            unsigned int x,y;
            Uint8 r,v,b,a=img->format->alpha;
            Uint32 pixel;
            SDL_LockSurface(img);
            SDL_LockSurface(tampon);
            for(x=0;x<img->w;x++)
            {
                for(y=0;y<img->h;y++)
                {
                    pixel=obtenirPixel(img,x,y);
                    SDL_GetRGB(pixel,img->format,&r,&v,&b);
                    definirPixel(tampon,x,y,SDL_MapRGBA(tampon->format,r,v,b,a));
                }
            }
            SDL_UnlockSurface(img);
            SDL_UnlockSurface(tampon);
            SDL_FreeSurface(img);
            img=tampon;
        }
    }
}
 
 
void Image::set_color(unsigned int x, unsigned int y, Uint32 col)
{
    Uint8 d,b,c,a;
    SDL_GetRGBA(col,img->format,&d,&c,&b,&a);
    if(a>0)
        set_alpha_perpixel();
    definirPixel(img,x,y,col);
}
 
void Image::set_color(unsigned int x, unsigned int y, Uint8 r, Uint8 v, Uint8 b, Uint8 a)
{
    if(a>0)
    {
        set_alpha_perpixel();
        definirPixel(img,x,y,SDL_MapRGBA(img->format,r,v,b,a));
    }
    else
    {
        definirPixel(img,x,y,SDL_MapRGB(img->format,r,v,b));
    }
}
 
 
Uint32 Image::get_color(unsigned int x, unsigned int y)const
{
    return obtenirPixel(img,x,y);
}
 
void Image::get_color(unsigned int x, unsigned int y, Uint8& r, Uint8& v, Uint8& b, Uint8& a)const
{
    Uint32 pixel=obtenirPixel(img,x,y);
    SDL_GetRGBA(pixel,img->format,&r,&v,&b,&a);
}

Merci de me donner vos avis : flexibilité/performances/...
De plus, dans le cas ou je ne créé pas de GodObject, je me retrouve a recopier 3 fois les mêmes fonctions...

18/08/2010, 15h30
NoIdea

Je vais essayé d'explicité un peu plus les 2 conceptions que j'avais envisagées :

Soit le shémas des classes (je ne montre pas tout) ressemble à

Object->app
Object->Sound_Object->Film
Object->Graphic_Object->Image->Label->Button
Object->Graphic_Object->Image->Film(Héritage en diamant.)

Soit :

app
Sound_Object->Film
Graphic_Object->Image->Label->Button
Graphic_Object->Image->Film(Pas de Héritage en diamant.)

Ce qui supprime une Vtable inutile et résout le problème de l'héritage en diamant mais nécessite de copier/coller les fonction de Object.

Si vous avez une autre solution, je suis preneur !
18/08/2010, 16h22
koala01

Salut,

Que penserais tu de la programmation générique et du CRTP :question:

Tu aurais:
template <CRTP> Object
Object<Button> -> Button
Object<Application> -> Application
Object<Sound> -> Sound
Object<Image> ->image
Object<Film> -> Film ( composition / agrégation de Sound et d'Image ;))

Aucune Vtable, aucun héritage en diamant, peu de copier coller si tu envisage les bons comportements transversaux...
18/08/2010, 16h41
NoIdea

Tel quel, le système ne fonctionnerais pas :

Un graphicObject a un std::vector<graphicObject*>sous_objets.
Et il y a la fonction virtuelle pure actualise (qui dessine l'image à l'écran).
Mais rien n'empeche un Objet<GraphicObject> et donc mes sous_classes (label, image, button...) hériterais quand même de GraphicObject.

Mais sa éviterais le copier/coller pour app, SoundObject et GraphicObject tout en évitant le GodObject.

Merci de ta réponse, je crois que je vais partir de cette base.
Cependant, si quelqu'un a d'autres idées, n'hésitais pas a en faire part
Il me semble que le type erasure pourrais aussi m'aider...
Je pars voir le tutoriel du forum, voir si sa pourrait aller.
18/08/2010, 17h25
NoIdea

J'ai été peut être un peu trop rapide :

En effet que m'apporte le CRTP ?

Dans le cas ou object est un GodObject, aucune des fonctions emit, add_event,... ne sont virtuelles. Il n'y a donc pas de gain a ce niveau la.

Le seul avantage du CRTP serait de pouvoir spécialiser les fonction emit, add_event, ... quand se serait nécéssaire à l'aide de la spécialisation des template.

Cependant, je ne pense pas qu'il y ai un quelconque intérêt a redéfinir ces fonctions. Le gain est donc minime.
18/08/2010, 17h41
koala01

Ce que CRTP t'apporte, c'est l'absence d'une classe de base commune.

Tu obtiens donc (si tu décides de faire hériter certaines classes des classes qui profitent du CRTP : ImageButton héritant de Button, par exemple) des hiérarchies distinctes et moins importantes, donc, plus flexibles ;)
18/08/2010, 17h53
NoIdea

En quoi la distinction des hiérarchies rend t-elle le tout plus flexible ?
18/08/2010, 18h31
koala01

Citation:

Envoyé par NoIdea

En quoi la distinction des hiérarchies rend t-elle le tout plus flexible ?

Parce que chaque hiérarchie peut évaluer de manière tout à fait disticnte, et que tu peux même décider, si le besoin s'en fait sentir, d'un héritage multiple basé sur... les classes de deux (ou plusieurs) hiérarchies distinctes, sans craindre le fameux héritage en losange.

De plus, il est beaucoup plus facile se se faire une idée d'ensemble lorsque l'on est confronté à plusieurs hiérarchies de classes "limitées" que lorsque l'on est confronté à une seule hiérarchie "monolithique" ;)

Merci pour ces explications.
Même si les avantages du CRTP dans ce projet me paraisse assez faible, il est clair qu'il n'offre aucun désavantage.

Je vous poste donc le nouveau code espérant que vous pourrez me donner votre avis en tant que "utilisateur" :

-performance
-facilité d'utilisation
-flexibilité
-...

J'ai renommer ma classe Objet Emittable

Voici le nouveau code :

main.cpp

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#include "Evenement.hpp"
#include "Callback.hpp"
#include "binding.hpp"
#include "app.hpp"
#include "Object.hpp"
#include <iostream>
#include "Image.h"
 
using namespace std;
 
void escape(app& appli, bool pressed, SDL_keysym& key)
{
    if((!pressed) && (key.sym==SDLK_ESCAPE))
        appli.quit();
}
 
 
int main(int argc, char**argv)
{
    app appli;
    Image img("U:\\Disque amovible\\Projets programmatioin\\Jeu\\ciel.bmp");
    SDL_Surface*screen=appli.get_screen();
    Image img2(img.copier_redim_propor(640u,480u));
    img2.blit(screen);
    SDL_Flip(screen);
    Image(Image::*cop)(unsigned int,unsigned int)const =&Image::copier_redim_propor;
    void(Image::*blit)(SDL_Surface*, unsigned int, unsigned int)const =&Image::blit;
    appli.add_event("resize",Evenement<int,int>::make_callback(img2,make_member(img,cop),placeholders::_1, placeholders::_2));
    appli.add_event("resize",Evenement<int,int>::make_callback_void(make_member(img2,blit), screen, 0,0));
    appli.add_event("resize",Evenement<int,int>::make_callback_void(SDL_Flip, screen));
    appli.add_event("keyboard",Evenement<bool, SDL_keysym>::make_callback_void(escape,ref(appli),placeholders::_1, placeholders::_2));
    appli.wait();
    SDL_Quit();
    return 0;
}

Object.hpp

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#ifndef OBJECT_HPP_INCLUDED
#define OBJECT_HPP_INCLUDED
 
#include <utility>
#include <iostream>
#include <string>
#include <vector>
#include <unordered_map>
#include "Callback.hpp"
#include "Evenement.hpp"
#include <SDL/SDL.h>
 
 
template<typename T>
class Emittable
{
    protected :
        std::unordered_map<std::string,std::vector<Callback>>Callbacks;
        inline bool has_key(std::string key)const
        {
            return !(Callbacks.find(key)==Callbacks.end());
        }
        void handle_event(std::string key, void*even)const
        {
            const std::vector<Callback>& vect=(Callbacks.find(key))->second;
            for(unsigned int i=0;i<vect.size();i++)
            {
                (vect[i])(even);
            }
        }
    public :
        template<typename ...Args>
        inline void emit(std::string key, Evenement<Args...> even)const
        {
            if(has_key(key))
                handle_event(key,(void*)(&even));
        }
        inline void emit(std::string key)const
        {
            if(has_key(key))
                handle_event(key,NULL);
        }
        bool add_event(std::string key, Callback fc)
        {
            if(has_key(key))
            {
                std::vector<Callback>& vect=Callbacks[key];
                vect.push_back(fc);
                return false;
            }
            else
            {
                std::vector<Callback> vect(1,fc);
                Callbacks.insert(std::pair<std::string,std::vector<Callback>>(key,vect));
                return true;
            }
        }
        bool add_event(std::string key, Callback fc, unsigned int pos)
        {
            if(has_key(key))
            {
                std::vector<Callback>& vect=Callbacks[key];
                if(pos<vect.size())
                    vect.insert(vect.begin()+pos,fc);
                else
                    vect.push_back(fc);
                return false;
            }
            else
            {
                std::vector<Callback> vect(1,fc);
                Callbacks.insert(std::pair<std::string,std::vector<Callback>>(key,vect));
                return true;
            }
        }
        inline const std::unordered_map<std::string,std::vector<Callback>>& get_callbacks()const
        {
            return Callbacks;
        }
};
 
#endif // OBJECT_HPP_INCLUDED

Evenement.hpp

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#ifndef EVENEMENT_HPP_INCLUDED
#define EVENEMENT_HPP_INCLUDED
 
#include <tuple>
#include "Callback.hpp"
#include "binding.hpp"
 
template<typename ...ArgsE>
class Evenement
{
    private :
        std::tuple<ArgsE...> my_args;
    public :
        inline Evenement(ArgsE...args) : my_args(args...){}
        inline std::tuple<ArgsE...>get_args(){return my_args;}
        template<typename R, typename fc, typename ...Args>
        static Callback make_callback(R& retour,fc function, Args... param)
        {
            std::tuple<Args...> my_tuple(param...);
            return Callback
            (
                [
                    function, &retour,my_tuple
                ]
                (void*evens)
                    {
                        retour=stupid<R,fc,ArgsE...>::my_bind((fc)(function), my_tuple, ((Evenement<ArgsE...>*)(evens))->get_args());
                    }
            );
        }
        template<typename fc, typename ...Args>
        static Callback make_callback_void(fc function, Args... param)
        {
            std::tuple<Args...> my_tuple(param...);
            return Callback
            (
                [
                    function,my_tuple
                ]
                (void*evens)
                    {
                        stupid_v2<fc,ArgsE...>::my_bind((fc)(function), my_tuple, ((Evenement<ArgsE...>*)(evens))->get_args());
                    }
            );
        }
};
 
#endif // EVENEMENT_HPP_INCLUDED

app.hpp

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#ifndef APP_HPP_INCLUDED
#define APP_HPP_INCLUDED
 
#include "Object.hpp"
 
class app : public Emittable<app>
{
    private :
        bool exit;
        SDL_Surface*screen;
    public :
        app();
        void wait();
        inline void quit(){exit=true;}
        void show_callbacks();//Sert a debbuger
        SDL_Surface*get_screen()const;
        ~app();
};
 
#endif // APP_HPP_INCLUDED

Callback.hpp

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#ifndef CALLBACK_HPP_INCLUDED
#define CALLBACK_HPP_INCLUDED
 
#include <functional>
 
class Callback
{
    private :
        std::function<void(void*)> function;
    public :
        inline Callback(std::function<void(void*)> fc) : function(fc)
        {}
        inline void operator()(void*even) const
        {
            function(even);
        }
};

binding.hpp

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#ifndef BINDING_HPP_INCLUDED
#define BINDING_HPP_INCLUDED
 
#include <functional>
#include <tuple>
 
//Attention : ce fichier est totalement illisible
 
template<typename T, typename R, typename ...Args>
class member_function
{
    private :
        T* obj;
        R(T::*function)(Args...);
    public :
        member_function(T* ob, R(T::*func)(Args...)): obj(ob), function(func){}
        R operator()(Args...arg)const
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function<T,R,Args...> make_member(T* obj, R(T::*func)(Args...))
{
    return member_function<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function<T,R,Args...> make_member(T& obj, R(T::*func)(Args...))
{
    return member_function<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_3
{
    private :
        const T* obj;
        R(T::*function)(Args...);
    public :
        member_function_3(const T* ob, R(T::*func)(Args...)): obj(ob), function(func){}
        R operator()(Args...arg)const
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_3<T,R,Args...> make_member(const T* obj, R(T::*func)(Args...))
{
    return member_function_3<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function_3<T,R,Args...> make_member(const T& obj, R(T::*func)(Args...))
{
    return member_function_3<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_4
{
    private :
        const T* const obj;
        R(T::*function)(Args...);
    public :
        member_function_4(const T* const ob, R(T::*func)(Args...)): obj(ob), function(func){}
        R operator()(Args...arg)const
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_4<T,R,Args...> make_member(const T* const obj, R(T::*func)(Args...))
{
    return member_function_4<T,R,Args...>(obj, func);
}
 
 
template<typename T, typename R, typename ...Args>
class member_function_2
{
    private :
        T* obj;
        R(T::*function)(Args...)const;
    public :
        member_function_2(T* ob, R(T::*func)(Args...)const): obj(ob), function(func){}
        R operator()(Args...arg)const
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_2<T,R,Args...> make_member(T* obj, R(T::*func)(Args...)const)
{
    return member_function_2<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function_2<T,R,Args...> make_member(T& obj, R(T::*func)(Args...)const)
{
    return member_function_2<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_5
{
    private :
        const T* obj;
        R(T::*function)(Args...)const;
    public :
        member_function_5(const T* ob, R(T::*func)(Args...)const): obj(ob), function(func){}
        R operator()(Args...arg)const
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_5<T,R,Args...> make_member(const T* obj, R(T::*func)(Args...)const)
{
    return member_function_5<T,R,Args...>(obj, func);
}
 
template<typename T, typename R, typename ...Args>
member_function_5<T,R,Args...> make_member(const T& obj, R(T::*func)(Args...)const)
{
    return member_function_5<T,R,Args...>(&obj, func);
}
 
template<typename T, typename R, typename ...Args>
class member_function_6
{
    private :
        const T* const obj;
        R(T::*function)(Args...)const;
    public :
        member_function_6(const T* const ob, R(T::*func)(Args...)const): obj(ob), function(func){}
        R operator()(Args...arg)const
        {
            return (obj->*function)(arg...);
        }
};
 
 
template<typename T, typename R, typename ...Args>
member_function_6<T,R,Args...> make_member(const T* const obj, R(T::*func)(Args...)const)
{
    return member_function_6<T,R,Args...>(obj, func);
}
 
 
template<typename R,unsigned int N>
struct get_args_impl_2
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static R apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
        return get_args_impl_2<R,N-1>::apply(function, E, std::get<N-1>(E), finis...);
    }
};
 
template<typename R>
struct get_args_impl_2<R,0>
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static R apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
             return function(finis...);
    }
};
 
template<typename R,unsigned int N>
struct get_args_impl
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static R apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        return get_args_impl<R,N-1>::apply(function, t, E, std::get<N-1>(t), argsfait...);
    }
};
 
template<typename R>
struct get_args_impl<R,0>
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static R apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        return get_args_impl_2<R,sizeof...(ArgsE)>::apply(std::bind(function, argsfait...), E);
    }
};
 
template<typename R,typename Fc,typename ...ArgsE>
struct stupid
{
    template<typename ...Args>
    static R my_bind(Fc function,const std::tuple<Args...>& t, std::tuple<ArgsE...> te)
    {
        return get_args_impl<R,sizeof...(Args)>::apply(function, t, te);
    }
};
 
 
 
 
template<unsigned int N>
struct get_args_impl_2_v2
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static void apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
        get_args_impl_2_v2<N-1>::apply(function, E, std::get<N-1>(E), finis...);
    }
};
 
template<>
struct get_args_impl_2_v2<0>
{
    template<typename Fc, typename ...Args, typename ...ArgsFE>
    static void apply(Fc function, std::tuple<Args...> E,ArgsFE...finis )
    {
             function(finis...);
    }
};
 
template<unsigned int N>
struct get_args_impl_v2
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static void apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        get_args_impl_v2<N-1>::apply(function, t, E, std::get<N-1>(t), argsfait...);
    }
};
 
template<>
struct get_args_impl_v2<0>
{
    template<typename Fc, typename ...Args, typename ...ArgsF, typename ...ArgsE>
    static void apply(Fc function, std::tuple<Args...> t, std::tuple<ArgsE...> E, ArgsF...argsfait)
    {
        get_args_impl_2_v2<sizeof...(ArgsE)>::apply(std::bind(function, argsfait...), E);
    }
};
 
template<typename Fc,typename ...ArgsE>
struct stupid_v2
{
    template<typename ...Args>
    static void my_bind(Fc function,const std::tuple<Args...>& t, std::tuple<ArgsE...> te)
    {
        get_args_impl_v2<sizeof...(Args)>::apply(function, t, te);
    }
};
 
 
#endif // BINDING_HPP_INCLUDED

image.h

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#ifndef IMAGE_H_INCLUDED
#define IMAGE_H_INCLUDED
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <vector>
#include <string>
 
class Image
{
    private :
        SDL_Surface *img;
    public :
        Image (SDL_Surface *image=NULL, bool copier=true);
        Image (const char *chm_img);
        Image (const Image &image);
        ~Image ();
 
        void blit (SDL_Surface *image, unsigned int x=0, unsigned int y=0) const;
        void blit (Image &image, unsigned int x=0, unsigned int y=0) const;
 
        void redim (double rapport);
        void redim (double rapport_x, double rapport_y);
        void redim (unsigned int nouv_taille);
        void redim (unsigned int nouv_l, unsigned int nouv_h);
 
        Image copier_redim (double rapport) const ;
        Image copier_redim (double rapport_x, double rapport_y) const;
        Image copier_redim (unsigned int nouv_taille) const;
        Image copier_redim_h (unsigned int nouv_taille) const;
        Image copier_redim (unsigned int nouv_l, unsigned int nouv_h) const;
        Image copier_redim_propor (unsigned int nouv_l, unsigned int nouv_h) const;
 
        void set_transparency(unsigned int);
        void set_transparency(unsigned int alpha, SDL_Rect zone);
        inline const SDL_Surface *obt_image () const
        { return img; }
 
        void delete_color(std::vector<Uint32> col);
        void delete_color(Uint32 col);
 
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b, Uint8 a));
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b));
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b, Uint8 a, unsigned int x, unsigned int y));
        void delete_color(bool (*fc)(Uint8 r, Uint8 v, Uint8 b, unsigned int x, unsigned int y));
 
 
        void delete_transparent_borders();
        void keep_rectangle(unsigned int ,unsigned int , unsigned int , unsigned int);
        Image operator= (SDL_Surface *image);
        Image operator= (const Image &image);
        //bool saveAsPNG(const std::string filename);
        void set_alpha_perpixel();
 
        void set_color(unsigned int x, unsigned int y, Uint32 col);
        void set_color(unsigned int x, unsigned int y, Uint8 r, Uint8 v, Uint8 b, Uint8 a=0);
 
        Uint32 get_color(unsigned int x, unsigned int y)const;
        void get_color(unsigned int x, unsigned int y, Uint8& r, Uint8& v, Uint8& b, Uint8& a)const;
};
 
 
 
#endif // IMAGE_H_INCLUDED

app.cpp

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#include "app.hpp"
#include "Object.hpp"
#include <SDL/SDL.h>
 
app::~app()
{
    quit();
}
 
SDL_Surface* app::get_screen()const
{
    return screen;
}
 
app::app() : Emittable<app>()
{
    SDL_Init( SDL_INIT_EVERYTHING );
    freopen("CON", "w", stdout);//"Fait marcher" la console
    freopen("CON", "r", stdin);
    freopen("CON", "w", stderr);
    screen=SDL_SetVideoMode( 640, 480, 32, SDL_HWSURFACE|SDL_RESIZABLE );
    add_event("resize",Evenement<int,int>::make_callback(screen,SDL_SetVideoMode, std::placeholders::_1, std::placeholders::_2,32, SDL_HWSURFACE|SDL_RESIZABLE));
    add_event("resize",Evenement<int,int>::make_callback_void(SDL_Flip, screen));
    add_event("delete_screen",Evenement<>::make_callback_void(SDL_FreeSurface,screen));
    add_event("sdl_quit",Evenement<>::make_callback_void(SDL_FreeSurface,screen));
    add_event("sdl_quit",Evenement<>::make_callback_void(make_member(this,&app::quit)));
    add_event("application_closed",Evenement<>::make_callback_void(SDL_FreeSurface,screen));
}
 
void app::wait()
{
    SDL_Event event;
    exit=false;
    while(!exit)
    {
        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_VIDEORESIZE :
                emit("resize", Evenement<int,int>(event.resize.w,event.resize.h));
                break;
            case SDL_KEYDOWN :
                emit("keyboard", Evenement<bool, SDL_keysym>(true,event.key.keysym));
                break;
            case SDL_KEYUP :
                emit("keyboard", Evenement<bool, SDL_keysym>(false,event.key.keysym));
                break;
            case SDL_MOUSEBUTTONDOWN :
                emit("mouse_button", Evenement<bool, Uint8,Uint16,Uint16>(true,event.button.which,event.button.x,event.button.y));
                break;
            case SDL_MOUSEBUTTONUP :
                emit("mouse_button", Evenement<bool, Uint8,Uint16,Uint16>(false,event.button.which,event.button.x,event.button.y));
                break;
            case SDL_MOUSEMOTION :
                emit("mouse_motion", Evenement<bool, Uint16,Uint16,Uint16,Uint16>(event.motion.state==SDL_PRESSED,event.motion.x,event.motion.y,event.motion.xrel,event.motion.yrel));
                break;
            case SDL_VIDEOEXPOSE :
                emit("video_expose");
                break;
            case SDL_ACTIVEEVENT :
                emit("window_sate",Evenement<bool>(event.active.gain==1));
                break;
            case SDL_QUIT :
                emit("sdl_quit");
                break;
        }
    }
    emit("application_closed");
}
 
 
void app::show_callbacks()
{
    std::cout<<"showing callbacks";
    std::unordered_map<std::string,std::vector<Callback>>::iterator it;
    for(it=Callbacks.begin();it!=Callbacks.end();it++)
    {
        std::cout<<"\n"<<(*it).first<<" nb_func= "<<(*it).second.size();
    }
}

Image.cpp

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#include "Image.h"
#include <SDL/SDL_image.h>
#include <iostream>
#include <windows.h>
#include <SDL/SDL_rotozoom.h>
#include <limits.h>
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
 
    #define MASQUE_ROUGE 0xff000000
    #define MASQUE_VERT  0x00ff0000
    #define MASQUE_BLEU  0x0000ff00
    #define MASQUE_ALPHA 0x000000ff
 
#else
 
    #define MASQUE_ROUGE 0x000000ff
    #define MASQUE_VERT  0x0000ff00
    #define MASQUE_BLEU  0x00ff0000
    #define MASQUE_ALPHA 0xff000000
 
#endif
 
 
Image::Image (SDL_Surface *image, bool copier)
{
    if (image)
    {
        if (copier)
            img=SDL_DisplayFormatAlpha(image);
        else
            img=image;
    }
    else
    {
        img=SDL_CreateRGBSurface(SDL_HWSURFACE, 100,100,32,0,0,0,0);
        SDL_SetAlpha (img,SDL_SRCALPHA,0);
    }
}
Image::Image (const char *chm_img)
{
    SDL_Surface*tmp=IMG_Load(chm_img);
    if (!tmp)
    {
        img=SDL_CreateRGBSurface(SDL_HWSURFACE, 100,100,32,0,0,0,0);
        SDL_SetAlpha (img,SDL_SRCALPHA,0);
    }
    else
    {
        img=SDL_DisplayFormatAlpha( tmp );
        SDL_FreeSurface(tmp);
    }
}
 
Image::Image (const Image &image)
{
    img=SDL_DisplayFormatAlpha( image.img );
 
}
 
Image::~Image ()
{
    SDL_FreeSurface (img);
}
 
void Image::blit (SDL_Surface *image, unsigned int x, unsigned int y) const
{
    if (image)
    {
        SDL_Rect tmp={(Uint16)x,(Uint16)y,0,0};
        SDL_BlitSurface (img,NULL,image,&tmp);
    }
}
void Image::blit (Image &image, unsigned int x, unsigned int y)const
{
    SDL_Rect tmp={(Uint16)x,(Uint16)y,(Uint16)img->w,(Uint16)img->h};
    SDL_BlitSurface (img,NULL,image.img,&tmp);
}
 
void Image::redim (double rapport)
{ redim (rapport,rapport); }
void Image::redim (double rapport_x, double rapport_y)
{
    if(img->format->alpha==255 || img->format->Amask!=0)
    {
        SDL_Surface *tampon=zoomSurface(img,rapport_x,rapport_y,0);
        SDL_FreeSurface (img);
        img=tampon;
    }
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        SDL_Surface *tampon=zoomSurface(tmp,rapport_x,rapport_y,0);
        SDL_FreeSurface (img);
        SDL_FreeSurface (tmp);
        img=tampon;
    }
}
void Image::redim (unsigned int nouv_taille)
{ redim (nouv_taille,img->h*nouv_taille/img->w); }
 
 
void Image::redim (unsigned int nouv_l, unsigned int nouv_h)
{
    if(img->format->alpha==255 || img->format->Amask!=0)
    {
        SDL_Surface *tampon=zoomSurface(img,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
        SDL_FreeSurface (img);
        img=tampon;
    }
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        SDL_Surface *tampon=zoomSurface(tmp,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
        SDL_FreeSurface (img);
        SDL_FreeSurface (tmp);
        img=tampon;
    }
}
 
Image Image::copier_redim (double rapport)const
{ return copier_redim(rapport,rapport); }
Image Image::copier_redim (double rapport_x, double rapport_y)const
{
    SDL_Surface*tampon;
    if(img->format->alpha==255 || img->format->Amask!=0)
        tampon=zoomSurface(img,rapport_x,rapport_y,0);
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        tampon=zoomSurface(tmp,rapport_x,rapport_y,0);
        SDL_FreeSurface (tmp);
    }
    //Image tmp(tampon,false);
    Image tmp(tampon,true);
    SDL_FreeSurface(tampon);
    return tmp;
}
Image Image::copier_redim (unsigned int nouv_taille)const
{ return copier_redim(nouv_taille,img->h*nouv_taille/img->w); }
 
Image Image::copier_redim_h (unsigned int nouv_taille)const
{ return copier_redim(img->w*nouv_taille/img->h,nouv_taille); }
 
Image Image::copier_redim (unsigned int nouv_l, unsigned int nouv_h)const
{
    SDL_Surface*tampon;
    if(img->format->alpha==255 || img->format->Amask!=0)
        tampon=zoomSurface(img,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
    else
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        tampon=zoomSurface(tmp,(double)nouv_l/img->w,(double)nouv_h/img->h,0);
        SDL_FreeSurface (tmp);
    }
    //Image tmp(tampon,false);
    Image tmp(tampon,true);
    SDL_FreeSurface(tampon);
    return tmp;
}
 
Image Image::operator= (SDL_Surface *image)
{
    if (image)
    {
        SDL_FreeSurface (img);
        img=SDL_DisplayFormatAlpha(image);
    }
    return *this;
}
/*Image Image::operator= (Image &image)
{
    SDL_FreeSurface (img);
    img=SDL_CreateRGBSurface(SDL_HWSURFACE,image.img->w,image.img->h,fenetre->ecran->format->BitsPerPixel,0,0,0,0);
    SDL_BlitSurface (image.img,NULL,img,NULL);
    return *this;
}*/
 
Image Image::operator= (const Image& image)
{
    SDL_FreeSurface (img);
    img=SDL_DisplayFormatAlpha(image.img);
    return *this;
}
 
Uint32 obtenirPixel(const SDL_Surface *surface, unsigned int x, unsigned int y)
{
    /*nbOctetsParPixel représente le nombre d'octets utilisés pour stocker un pixel.
    En multipliant ce nombre d'octets par 8 (un octet = 8 bits), on obtient la profondeur de couleur
    de l'image : 8, 16, 24 ou 32 bits.*/
    int nbOctetsParPixel = surface->format->BytesPerPixel;
    /* Ici p est l'adresse du pixel que l'on veut connaitre */
    /*surface->pixels contient l'adresse du premier pixel de l'image*/
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * nbOctetsParPixel;
 
    /*Gestion différente suivant le nombre d'octets par pixel de l'image*/
    switch(nbOctetsParPixel)
    {
        case 1:
            return *p;
 
        case 2:
            return *(Uint16 *)p;
 
        case 3:
            /*Suivant l'architecture de la machine*/
            if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
                return p[0] << 16 | p[1] << 8 | p[2];
            else
                return p[0] | p[1] << 8 | p[2] << 16;
 
        case 4:
            return *(Uint32 *)p;
 
        /*Ne devrait pas arriver, mais évite les erreurs*/
        default:
            return 0;
    }
}
 
void definirPixel(SDL_Surface *surface, unsigned int x, unsigned int y, Uint32 pixel)
{
    /*nbOctetsParPixel représente le nombre d'octets utilisés pour stocker un pixel.
    En multipliant ce nombre d'octets par 8 (un octet = 8 bits), on obtient la profondeur de couleur
    de l'image : 8, 16, 24 ou 32 bits.*/
    int nbOctetsParPixel = surface->format->BytesPerPixel;
    /*Ici p est l'adresse du pixel que l'on veut modifier*/
    /*surface->pixels contient l'adresse du premier pixel de l'image*/
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * nbOctetsParPixel;
 
    /*Gestion différente suivant le nombre d'octets par pixel de l'image*/
    switch(nbOctetsParPixel)
    {
        case 1:
            *p = pixel;
            break;
 
        case 2:
            *(Uint16 *)p = pixel;
            break;
 
        case 3:
            /*Suivant l'architecture de la machine*/
            if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
            {
                p[0] = (pixel >> 16) & 0xff;
                p[1] = (pixel >> 8) & 0xff;
                p[2] = pixel & 0xff;
            }
            else
            {
                p[0] = pixel & 0xff;
                p[1] = (pixel >> 8) & 0xff;
                p[2] = (pixel >> 16) & 0xff;
            }
            break;
 
        case 4:
            *(Uint32 *)p = pixel;
            break;
    }
}
 
 
 
void Image::delete_color(Uint32 col)
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs,rc,vc,bc;
        SDL_GetRGB(col, img->format, &rc, &vc, &bc);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        if(SDL_MUSTLOCK(tmp))
        {
            for(x=0;x<tmp->w;x++)
            {
                for(y=0;y<tmp->h;y++)
                {
                    pixel=obtenirPixel(tmp,x,y);
                    SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(tmp,x,y,invisible);
                }
            }
            SDL_UnlockSurface(tmp);
        }
        else
        {
            for(x=0;x<tmp->w;x++)
            {
                for(y=0;y<tmp->h;y++)
                {
                    pixel=obtenirPixel(tmp,x,y);
                    SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(tmp,x,y,invisible);
                }
            }
        }
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs,rc,vc,bc;
        SDL_GetRGB(col, img->format, &rc, &vc, &bc);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        if(SDL_MUSTLOCK(img))
        {
            SDL_LockSurface(img);
            for(x=0;x<img->w;x++)
            {
                for(y=0;y<img->h;y++)
                {
                    pixel=obtenirPixel(img,x,y);
                    SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(img,x,y,invisible);
                }
            }
            SDL_UnlockSurface(img);
        }
        else
        {
            for(x=0;x<img->w;x++)
            {
                for(y=0;y<img->h;y++)
                {
                    pixel=obtenirPixel(img,x,y);
                    SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                    if(rs==rc && vc==vs && bc==bs)
                        definirPixel(img,x,y,invisible);
                }
            }
        }
    }
}
 
 
 
void Image::delete_color(std::vector<Uint32>col)
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y,i;
        Uint8 rs,vs,bs,*rc=new Uint8[col.size()],*vc=new Uint8[col.size()],*bc=new Uint8[col.size()];
        for(i=0;i<col.size();i++)
            SDL_GetRGB(col[i], img->format, &rc[i], &vc[i], &bc[i]);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                for(i=0;i<col.size();i++)
                {
                    if(rs==rc[i] && vc[i]==vs && bc[i]==bs)
                    {
                        definirPixel(tmp,x,y,invisible);
                        break;
                    }
                }
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
        delete rc;
        delete vc;
        delete bc;
    }
    else
    {
        unsigned int x,y,i;
        Uint8 rs,vs,bs,*rc=new Uint8[col.size()],*vc=new Uint8[col.size()],*bc=new Uint8[col.size()];
        for(i=0;i<col.size();i++)
            SDL_GetRGB(col[i], img->format, &rc[i], &vc[i], &bc[i]);
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                for(i=0;i<col.size();i++)
                {
                    if(rs==rc[i] && vc[i]==vs && bc[i]==bs)
                    {
                        definirPixel(img,x,y,invisible);
                        break;
                    }
                }
            }
        }
        SDL_UnlockSurface(img);
        delete rc;
        delete vc;
        delete bc;
    }
}
 
 
void Image::set_transparency(unsigned int i)
{
    if(img->format->Amask==0)
        SDL_SetAlpha(img,SDL_SRCALPHA,i);
    else
    {
        unsigned int x,y;
        Uint32 pixel,pixel1;
        Uint8 rs,bs,vs,as;
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixel, img->format,&rs,&vs,&bs,&as);
                if(as!=0)
                {
                    pixel1=SDL_MapRGBA(img->format,rs,vs,bs,i);
                    definirPixel(img,x,y,pixel1);
                }
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
void Image::set_transparency(unsigned int i, SDL_Rect zone)
{
    set_alpha_perpixel();
    SDL_LockSurface(img);
    Uint8 r,v,b,a;
    unsigned int x,y;
    Uint32 pixel;
    for(x=zone.x;x<=zone.x+zone.w;x++)
    {
        for(y=zone.y;y<=zone.y+zone.h;y++)
        {
            pixel=obtenirPixel(img,x,y);
            SDL_GetRGBA(pixel, img->format,&r,&v,&b,&a);
            if(a!=0)
                definirPixel(img,x,y,SDL_MapRGBA(img->format,r,v,b,i));
        }
    }
    SDL_UnlockSurface(img);
}
 
 
 
 
 
 
 
 
 
 
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8,Uint8))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGBA(pixel, tmp->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixel, img->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8,Uint8, unsigned int, unsigned int))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGBA(pixel, tmp->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as,x,y))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs,as;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixel, img->format, &rs, &vs, &bs,&as);
                if(fc(rs,vs,bs,as,x,y))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
 
void Image::delete_color(bool (*fc)(Uint8 ,Uint8,Uint8,unsigned int, unsigned int))
{
    if(img->format->Amask==0&&img->format->alpha==255)
    {
        SDL_Surface*tmp=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,32,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        blit(tmp);
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(tmp->format,0,0,0,0);
        SDL_LockSurface(tmp);
        for(x=0;x<tmp->w;x++)
        {
            for(y=0;y<tmp->h;y++)
            {
                pixel=obtenirPixel(tmp,x,y);
                SDL_GetRGB(pixel, tmp->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs,x,y))
                    definirPixel(tmp,x,y,invisible);
            }
        }
        SDL_UnlockSurface(tmp);
        SDL_FreeSurface(img);
        img=tmp;
    }
    else
    {
        unsigned int x,y;
        Uint8 rs,vs,bs;
        Uint32 pixel;
        Uint32 invisible=SDL_MapRGBA(img->format,0,0,0,0);
        SDL_LockSurface(img);
        for(x=0;x<img->w;x++)
        {
            for(y=0;y<img->h;y++)
            {
                pixel=obtenirPixel(img,x,y);
                SDL_GetRGB(pixel, img->format, &rs, &vs, &bs);
                if(fc(rs,vs,bs,x,y))
                    definirPixel(img,x,y,invisible);
            }
        }
        SDL_UnlockSurface(img);
    }
}
 
 
void Image::keep_rectangle(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2)
{
    if(img->format->Amask==0)
    {
        SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,x2-x1,y2-y1,32,0,0,0,0);
        SDL_Rect rect={(Uint16)x1,(Uint16)y1,(Uint16)(x2-1),(Uint16)(y2-1)};
        SDL_BlitSurface(img,&rect,tampon,NULL);
        tampon->format->alpha=img->format->alpha;
        SDL_FreeSurface(img);
        img=tampon;
    }
    else
    {
        SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,x2-x1,y2-y1,img->format->BitsPerPixel,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
        unsigned int x,y;
        Uint8 r,v,b,a;
        Uint32 pixelS,pixel;
        SDL_LockSurface(img);
        SDL_LockSurface(tampon);
        for(x=x1;x<x2;x++)
        {
            for(y=y1;y<y2;y++)
            {
                pixelS=obtenirPixel(img,x,y);
                SDL_GetRGBA(pixelS,img->format,&r,&v,&b,&a);
                pixel=SDL_MapRGBA(tampon->format,r,v,b,a);
                definirPixel(tampon,x-x1,y-y1,pixel);
            }
        }
        SDL_UnlockSurface(img);
        SDL_UnlockSurface(tampon);
        SDL_FreeSurface(img);
        img=tampon;
    }
}
 
 
 
void Image::delete_transparent_borders()
{
    unsigned int i,j;
    Uint32 Pixel;
    Uint8 t1,t2,t3,a;
    bool empty=true;
    SDL_LockSurface(img);
    for(i=0;i<img->h&&empty;i++)
    {
        for(j=0;j<img->w;j++)
        {
            Pixel=obtenirPixel(img,j,i);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(0,i-1,img->w,img->h);
    empty=true;
    SDL_LockSurface(img);
    for(i=0;i<img->w&&empty;i++)
    {
        for(j=0;j<img->h;j++)
        {
            Pixel=obtenirPixel(img,i,j);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(i-1,0,img->w,img->h);
    empty=true;
    SDL_LockSurface(img);
    for(i=img->h-1;i!=INT_MAX&&empty;i--)
    {
        for(j=0;j<img->w;j++)
        {
            Pixel=obtenirPixel(img,j,i);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(0,0,img->w,i+1);
    empty=true;
    SDL_LockSurface(img);
    for(i=img->w-1;i!=INT_MAX&&empty;i--)
    {
        for(j=0;j<img->h;j++)
        {
            Pixel=obtenirPixel(img,i,j);
            SDL_GetRGBA(Pixel,img->format,&t1,&t2,&t3,&a);
            if(a!=0)
            {
                empty=false;
                break;
            }
        }
    }
    SDL_UnlockSurface(img);
    keep_rectangle(0,0,i+1,img->h);
 
}
 
 
 
 
 
 
 
 
 
 
Uint32 getPixel(SDL_Surface *surface, int x, int y)
{
    int bpp = surface->format->BytesPerPixel;
    //Here p is the address to the pixel we want to retrieve
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
 
    switch(bpp) {
    case 1:
        return *p;
 
    case 2:
        return *(Uint16 *)p;
 
    case 3:
        if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
            return p[0] << 16 | p[1] << 8 | p[2];
        else
            return p[0] | p[1] << 8 | p[2] << 16;
 
    case 4:
        return *(Uint32 *)p;
 
    default:
        return 0; //shouldn't happen, but avoids warnings
    }
}
 
using namespace std;
 
/*bool Image::saveAsPNG(string fileName)
{
    set_alpha_perpixel();
    SDL_Surface*toSave=img;
 
     FILE* file = fopen(fileName.c_str(), "wb");
 
     if(!file)
     {
          cout<<"Impossible d'ouvrir le fichier "<<fileName<<" pour enregistrer le screenshot"<<endl;
          return false;
     }
 
     png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
     if(!png_ptr)
     {
          fclose(file);
          cout<<"Error1";
          return false;
     }
 
     png_infop   png_info = png_create_info_struct(png_ptr);
 
     if(!png_info)
     {
          png_destroy_write_struct(&png_ptr, &png_info);
          fclose(file);
          cout<<"Error2";
          return false;
     }
 
     if(setjmp(png_jmpbuf(png_ptr)))
     {
          png_destroy_write_struct(&png_ptr, &png_info);
          fclose(file);
          cout<<"Error3";
          return false;
     }
 
     //données de l'image
     png_init_io(png_ptr, file);
 
     // type de compression
     png_set_compression_level(png_ptr, Z_BEST_SPEED);
 
     // infos de l'image
     png_set_IHDR(png_ptr, png_info, static_cast<png_uint_32>(toSave->w),
                  static_cast<png_uint_32>(toSave->h), 8,
                  PNG_COLOR_TYPE_RGBA, PNG_INTERLACE_NONE,
                  PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
     // date de création
     png_time  modtime;
     png_convert_from_time_t(&modtime, time(NULL));
     png_set_tIME(png_ptr, png_info, &modtime);
 
     // commentaires de l'image
     png_text text[6];
 
     text[0].key = "Title";
     text[0].text = "";
     text[0].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[1].key = "Author";
     text[1].text = "";
     text[1].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[2].key = "Description";
     text[2].text = "";
     text[2].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[3].key = "Copyright";
     text[3].text = "";
     text[3].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[4].key = "E-mail";
     text[4].text = "";
     text[4].compression = PNG_TEXT_COMPRESSION_NONE;
 
     text[5].key = "Url";
     text[5].text = "";
     text[5].compression = PNG_TEXT_COMPRESSION_NONE;
 
     png_set_text(png_ptr, png_info, text, 6);
 
     // écriture de l'image
     png_write_info(png_ptr, png_info);
 
     png_byte* line;
     line = new png_byte[toSave->w * 4];
     Uint8 r,v,b,a;
     SDL_LockSurface(toSave);
     for(int i = 0; i < toSave->h; ++i)
     {
          for(int p = 0, j = 0; j < toSave->w; ++j)
          {
               // extraction du pixel de la SDL_Surface*
               Uint32 pixel = getPixel(toSave, j, i);
               SDL_GetRGBA(pixel,toSave->format,&r,&v,&b,&a);
               line[p++]=r;
               line[p++]=v;
               line[p++]=b;
               line[p++]=a;
          }
          // écriture de la ligne dans le fichier
          png_write_row(png_ptr, line);
     }
     SDL_UnlockSurface(toSave);
     delete[] line;
 
     png_write_end(png_ptr, png_info);
 
     png_destroy_write_struct(&png_ptr, &png_info);
     fclose(file);
     return true;
}*/
 
void Image::set_alpha_perpixel()
{
    if(img->format->Amask==0)
    {
        if(img->format->alpha==0)
        {
            SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,img->format->BitsPerPixel,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
            SDL_BlitSurface(img,NULL,tampon,NULL);
            SDL_FreeSurface(img);
            img=tampon;
        }
        else
        {
            SDL_Surface*tampon=SDL_CreateRGBSurface(SDL_HWSURFACE,img->w,img->h,img->format->BitsPerPixel,MASQUE_ROUGE,MASQUE_VERT,MASQUE_BLEU,MASQUE_ALPHA);
            unsigned int x,y;
            Uint8 r,v,b,a=img->format->alpha;
            Uint32 pixel;
            SDL_LockSurface(img);
            SDL_LockSurface(tampon);
            for(x=0;x<img->w;x++)
            {
                for(y=0;y<img->h;y++)
                {
                    pixel=obtenirPixel(img,x,y);
                    SDL_GetRGB(pixel,img->format,&r,&v,&b);
                    definirPixel(tampon,x,y,SDL_MapRGBA(tampon->format,r,v,b,a));
                }
            }
            SDL_UnlockSurface(img);
            SDL_UnlockSurface(tampon);
            SDL_FreeSurface(img);
            img=tampon;
        }
    }
}
 
 
void Image::set_color(unsigned int x, unsigned int y, Uint32 col)
{
    Uint8 d,b,c,a;
    SDL_GetRGBA(col,img->format,&d,&c,&b,&a);
    if(a>0)
        set_alpha_perpixel();
    definirPixel(img,x,y,col);
}
 
void Image::set_color(unsigned int x, unsigned int y, Uint8 r, Uint8 v, Uint8 b, Uint8 a)
{
    if(a>0)
    {
        set_alpha_perpixel();
        definirPixel(img,x,y,SDL_MapRGBA(img->format,r,v,b,a));
    }
    else
    {
        definirPixel(img,x,y,SDL_MapRGB(img->format,r,v,b));
    }
}
 
 
Uint32 Image::get_color(unsigned int x, unsigned int y)const
{
    return obtenirPixel(img,x,y);
}
 
void Image::get_color(unsigned int x, unsigned int y, Uint8& r, Uint8& v, Uint8& b, Uint8& a)const
{
    Uint32 pixel=obtenirPixel(img,x,y);
    SDL_GetRGBA(pixel,img->format,&r,&v,&b,&a);
}
 
 
 
Image Image::copier_redim_propor (unsigned int nouv_l, unsigned int nouv_h) const
{
    if(nouv_l*img->h>img->w*nouv_h)
        return copier_redim_h(nouv_h);
    else
        return copier_redim(nouv_l);
}

Merci d'avance.

De plus, me conseillez-vous de migrer a SFML ou de rester avec SDL ?