clip_edge: 20000 cases, 0 mismatches, 0 div0 (both), 0 near-ret bug, flag values 10 distinct
edge_dda: 4000 cases, 0 mismatches
line_M: 1000 cases, 0 mismatches
polygon (0333+003E+010A+1359 M): 2000 cases, 0 mismatches, 0 div0
  cov bisect_in 32 iters fail                  9
  cov bisect_in corner fail                    3191
  cov bisect_out 32 iters                      21
  cov bisect_out on border                     1325
  cov f16 85C0 -> 32                           2
  cov f16 clipped                              2822
  cov f16 dx overflow -> 32                    175
  cov f16 fail end0 5                          986
  cov f16 fail end0 a                          970
  cov f16 fail end1 5                          1
  cov f16 fail end1 a                          1
  cov f16 reject x side                        2906
  cov f16 reject y                             7975
  cov finish 85BE=0                            1468
  cov finish 85BE=1                            130
  cov finish 85BE=3                            158
  cov finish closing edge                      244
  cov finish nothing rasterised, both walls    211
  cov half quirk -1                            145
  cov half quirk unhalved                      320
  cov half quirk zero                          314
  cov p32 both out ok                          604
  cov p32 end0 out                             70
  cov p32 end1 out                             68
  cov p32 trivial reject                       10167
  cov wall drawn                               1734
  cov wall single row skipped                  1
