void Modifier_pinceau(int Largeur, int Hauteur);
void Retrecir_pinceau(void);
void Grossir_pinceau(void);

void Special_Next_forecolor(void);
void Special_Previous_forecolor(void);
void Special_Next_backcolor(void);
void Special_Previous_backcolor(void);

void Scroller_ecran(short Decalage_en_X,short Decalage_en_Y);
void Scroller_loupe(short Decalage_en_X,short Decalage_en_Y);

void Zoom(short Sens);