16a17,19
> 
> To compile:
> g++ -pipe  -O3 -s -fomit-frame-pointer -funroll-loops fv.cpp -o fv
33c36,37
< const int HSIZE=0x8000000;  
---
> //const int HSIZE=0x8000000;
> const int HSIZE=0x2000000; // reduced memory for a 256 MB PC
156,157c160,167
<   fprintf(stderr, "Drawing fv.bmp %d by %d from %s (%1.0f bytes)\n", 
<     width, height, argv[1], size);
---
> 
>   char suffix[] = "_fv.bmp";
>   char* outfile_name = (char*) malloc(strlen(argv[1]) + strlen(suffix) + 1);
>   strcpy(outfile_name, argv[1]);
>   strcat(outfile_name, suffix);
> 
>   fprintf(stderr, "Drawing %s %d by %d from %s (%1.0f bytes)\n",
>     outfile_name, width, height, argv[1], size);
212,213c222,226
<   g.saveBMP("fv.bmp");
<   fprintf(stderr, "Created fv.bmp in %1.2f seconds\n", 
---
>   //g.saveBMP("fv.bmp");
>   g.saveBMP(outfile_name);
> 
>   fprintf(stderr, "Created %s in %1.2f seconds\n",
>     outfile_name,
224d236
<