transfer: slightly relax the domain overlap check

Allow the destination domain to be outside the source by a small margin
(1e-12).

1 files changed, 3 insertions, 1 deletions

diff --git a/transfer.c b/transfer.c
index a43c596..01b9efc 100644
--- a/transfer.c
+++ b/transfer.c
@@ -482,7 +482,9 @@ int mg2di_gt_init(GridTransferContext *ctx)
         dst_start = ctx->dst.start[i] * ctx->dst.step[i];
         dst_end   = (ctx->dst.start[i] + ctx->dst.size[i] - 1) * ctx->dst.step[i];
 
-        if (src_start >= src_end || dst_start < src_start || dst_end > src_end)
+        if (src_start >= src_end           ||
+            dst_start - src_start < -1e-12 ||
+            src_end   - dst_end   < -1e-12)
             return -EINVAL;
     }