From d95492a6eefc35868065fd0685b119c0e683f7d2 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 28 Dec 2019 18:51:39 +0100
Subject: transfer: slightly relax the domain overlap check

Allow the destination domain to be outside the source by a small margin
(1e-12).
---
 transfer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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;
     }
 
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