2615    int btoa[4]={0,0,0,0};  in compare_two_images()  local
2824             btoa[bloc[i]] = aloc[i]; /* may be '4' for alpha */  in compare_two_images()
2847       btoa[3] = btoa[2] = btoa[1] = btoa[0] = 4; /* 4 == not present */  in compare_two_images()
2886                      if (pua[btoa[3]] != pub[3]) break;  in compare_two_images()
2889                      if (pua[btoa[2]] != pub[2]) break;  in compare_two_images()
2892                      if (pua[btoa[1]] != pub[1]) break;  in compare_two_images()
2895                      if (pua[btoa[0]] != pub[0]) break;  in compare_two_images()
2908                      if (psa[btoa[3]] != psb[3]) break;  in compare_two_images()
2911                      if (psa[btoa[2]] != psb[2]) break;  in compare_two_images()
2914                      if (psa[btoa[1]] != psb[1]) break;  in compare_two_images()
2917                      if (psa[btoa[0]] != psb[0]) break;  in compare_two_images()