From 082b09038d9834f8dccde97733eab6f3d90b7016 Mon Sep 17 00:00:00 2001
From: Tim Segers <tsegers@pm.me>
Date: Mon, 3 Oct 2022 15:50:45 +0200
Subject: Optimize stoplen calculation

Find the length of a stop in 10 minute increments before refining it
with 1 minute increments.
---
 schedule.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/schedule.c b/schedule.c
index b737453..4c111f2 100644
--- a/schedule.c
+++ b/schedule.c
@@ -90,6 +90,23 @@ double calc_ndl(decostate_t *ds, const double depth, const double ascrate, const
     return ndl;
 }
 
+double calc_stoplen_rough(decostate_t *ds, const double depth, const double current_gf, const gas_t *gas)
+{
+    decostate_t ds_ = *ds;
+    double stoplen = 0;
+
+    while (1) {
+        double tmp = add_segment_const(&ds_, depth, 10, gas);
+
+        if (ceiling(&ds_, current_gf) != depth)
+            break;
+
+        stoplen += tmp;
+    }
+
+    return stoplen;
+}
+
 int should_switch(const gas_t **next, double *switch_depth, const decostate_t *ds, const double depth,
                   const double next_stop, const gas_t *deco_gasses, const int nof_gasses)
 {
@@ -222,6 +239,15 @@ decoinfo_t calc_deco(decostate_t *ds, const double start_depth, const gas_t *sta
         /* stop */
         double stoplen = 0;
 
+        /* rough steps */
+        double stoplen_rough = calc_stoplen_rough(ds, depth, current_gf, gas);
+
+        if (stoplen_rough) {
+            add_segment_const(ds, depth, stoplen_rough, gas);
+            stoplen += stoplen_rough;
+        }
+
+        /* fine steps */
         while (ceiling(ds, current_gf) == depth)
             stoplen += add_segment_const(ds, depth, 1, gas);
 
-- 
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