houlala

#include <image.h>#include <string.h>#include <iostream>#include <string>#include <GL/gl.h>using namespace std;Image :: Image() : width(0), height(0), depth(0), offset(0), buffer(NULL){}Image :: Image(int _w, int _h, int _d) : width(_w), height(_h), depth(_d), offset(1){	buffer = new unsigned char[width * height * depth];}Image :: Image(const char * _filename) : width(0), height(0), depth(0), offset(0), buffer(NULL){	load(_filename);}Image :: Image(const Image & _i) : width(_i.width), height(_i.height), depth(_i.depth), offset(_i.offset){	memcpy(buffer, _i.buffer, width * height * depth * offset * sizeof(unsigned char));}Image :: ~Image(){	clear();}void Image :: clear(){	if(buffer != NULL)	{		if(offset == 1)			delete [] (unsigned char *)buffer;		else						delete [] (unsigned short *)buffer;				buffer = NULL;	}		width  = 0;	height = 0;		depth  = 0;	offset = 0;}bool Image :: loadPNM(ifstream & _file){	string magic, line;	int type;		_file >> magic;	type = atoi(&magic[1]);	if(magic[0] != 'P' &&  type < 1 && type > 6)	{		cerr << "[Image::loadPNG] Erreur. Le fichier n'est pas au format PNM (format : " << magic << "). Abandon du chargement." << endl;		return false;	}		_file >> std::ws;	while(_file.peek() == '#')		getline(_file, line);		_file >> width;	_file >> height;	_file >> offset;		switch(type)	{		case 3 :		case 6 :			depth = 3;			break;				default :			depth = 1;			break;	}		if(width * height <= 0)	{		cerr << "[Image::loadPNG] Erreur. Les dimensions de l'image sont incorrectes (x : " << width << ", y : " << height << "). Abandon du chargement." << endl;		return false;	}		if(offset <= 256)		offset = 1;	else		offset = 2;		if(offset == 1)	{		buffer = new unsigned char[width * height * depth * offset * sizeof(char)];				for(int j(height - 1); j > 0; j--)			_file.read((char *)&(((unsigned char *)buffer)[j * width * depth]), width * depth * offset * sizeof(char));	}			else	{		buffer = new unsigned short[width * height * depth * offset * sizeof(char)];			for(int j(height - 1); j > 0; j--)			_file.read((char *)&(((unsigned short *)buffer)[j * width * depth]), width * depth * offset * sizeof(char));	}		return true;}bool Image :: load(const char * _filename){	char * extension = strrchr(_filename, '.');	ifstream file(_filename, ios::binary);		if(file.is_open() == false)	{		cerr << "[Image::load] Erreur. Le fichier \"" << _filename << "\" est introuvable." << endl;		return false;	}		if(strcmp(extension, ".pgm") == 0)		return loadPNM(file);			if(strcmp(extension, ".ppm") == 0)		return loadPNM(file);			if(strcmp(extension, ".pnm") == 0)		return loadPNM(file);		file.close();		cerr << "[Image::load] Erreur. Le format du fichier \"" << _filename << "\" est inconnu." << endl;	return false;}void Image :: display() const{	glRasterPos2i(0, 0);	glDrawPixels(width, height, (depth == 1) ? GL_LUMINANCE : GL_RGB, (offset == 1) ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT, buffer);}int Image :: getWidth() const{	return width;}int Image :: getHeight() const{	return height;}