GESTION DE LA PALETTE ET AFFICHAGE D'UN .PCX EN 8BITS SOUS DJGPP EN C

void taille_pcx(char * fichier, unsigned * largeur, unsigned * hauteur)
{
	FILE * flot;
	unsigned width = 0, height = 0;

	flot = fopen(fichier,"rb");
	fseek(flot,8,SEEK_SET);
	fread(&width,2,1,flot);
	fread(&height,2,1,flot);
	width++;
	height++;

	*largeur = width;
	*hauteur = height;

	fclose(flot);
}

void charge_palette_pcx(char * fichier)
{	unsigned char pal[256][3]; 
	int i,j;
	FILE * flot;

	if(!(sauve_palette("palette.dat")))
	{
		printf("Erreur dans la sauvegarde de la palette.\n");
		exit(1);
	}

	flot = fopen(fichier,"rb");
	fseek(flot,-768L,SEEK_END);
	for(i = 0; i <256 ; i ++)
	{
		pal_rouge[i] = fgetc(flot)>>2;
		pal_vert[i] = fgetc(flot)>>2;
		pal_bleu[i] = fgetc(flot)>>2;
	}
	fclose(flot);
	applique_palette();
}

void charge_pcx(char * fichier, unsigned char * buffer, unsigned taille)
{
	FILE * flot;

	unsigned long position;
	unsigned num;
	unsigned char ch;

	flot = fopen(fichier,"rb");
	fseek(flot,128,SEEK_SET);

	position=0;
	do
	{
		ch = fgetc(flot);
		if ((ch & 0xC0) == 0xC0)
		{
			num = ch & 0x3F;
			ch = fgetc(flot);
			while(num--)
				buffer[position++]=ch;
		}
		else
			buffer[position++]=ch;
	}
	while(position < (taille));
	fclose(flot);
}

void affiche_pcx_transparent(unsigned char * buffersource, unsigned char * bufferdest, unsigned width, unsigned height, unsigned X, unsigned Y)
{
	int u, z;
	for (u=0; u<=height-1; u++)
		for (z=0; z<=width-1; z++)
		{
			if((int)buffersource[u*width+z] && ((table_mode.resolution_horizontale*(Y+u)+X+z) < (table_mode.resolution_horizontale*table_mode.resolution_verticale)) && ((X+z) < table_mode.resolution_horizontale))
				(unsigned char *)bufferdest[table_mode.resolution_horizontale*(Y+u)+X+z] = buffersource[u*width+z];
		}
}

void affiche_pcx(unsigned char * buffersource, unsigned char * bufferdest, unsigned width, unsigned height, unsigned X, unsigned Y)
{	int u, z;
	for (u=0; u<=height-1; u++)
		for (z=0; z<=width-1; z++)
		{
			if(((table_mode.resolution_horizontale*(Y+u)+X+z) < (table_mode.resolution_horizontale*table_mode.resolution_verticale)) && ((X+z) < table_mode.resolution_horizontale))
				(unsigned char *)bufferdest[table_mode.resolution_horizontale*(Y+u)+X+z] = buffersource[u*width+z];
		}
}