Add initial `BLI_math_time` with a 'seconds decompose' function.

Allows to decompose a given amount of seconds into a random set of
days/hours/minutes/seconds/milliseconds values.

Also add matching test.

Differential Revision: https://developer.blender.org/D11581

1 files changed, 35 insertions, 0 deletions

diff --git a/source/blender/blenlib/tests/BLI_math_time_test.cc b/source/blender/blenlib/tests/BLI_math_time_test.cc
new file mode 100644
index 00000000000..4743c11b95f
--- /dev/null
+++ b/source/blender/blenlib/tests/BLI_math_time_test.cc
@@ -0,0 +1,35 @@
+/* Apache License, Version 2.0 */
+
+#include "testing/testing.h"
+
+#include "BLI_math.h"
+
+TEST(math_time, SecondsExplode)
+{
+  const double seconds = 2.0 * SECONDS_IN_DAY + 13.0 * SECONDS_IN_HOUR + 33.0 * SECONDS_IN_MINUTE +
+                         9.0 + 369.0 * SECONDS_IN_MILLISECONDS;
+  const double epsilon = 1e-8;
+
+  double r_days, r_hours, r_minutes, r_seconds, r_milliseconds;
+
+  BLI_math_time_seconds_decompose(
+      seconds, &r_days, &r_hours, &r_minutes, &r_seconds, &r_milliseconds);
+  EXPECT_NEAR(2.0, r_days, epsilon);
+  EXPECT_NEAR(13.0, r_hours, epsilon);
+  EXPECT_NEAR(33.0, r_minutes, epsilon);
+  EXPECT_NEAR(9.0, r_seconds, epsilon);
+  EXPECT_NEAR(369.0, r_milliseconds, epsilon);
+
+  BLI_math_time_seconds_decompose(seconds, NULL, &r_hours, &r_minutes, &r_seconds, NULL);
+  EXPECT_NEAR(61.0, r_hours, epsilon);
+  EXPECT_NEAR(33.0, r_minutes, epsilon);
+  EXPECT_NEAR(9.369, r_seconds, epsilon);
+
+  BLI_math_time_seconds_decompose(seconds, NULL, NULL, NULL, &r_seconds, NULL);
+  EXPECT_NEAR(seconds, r_seconds, epsilon);
+
+  BLI_math_time_seconds_decompose(seconds, &r_days, NULL, &r_minutes, NULL, &r_milliseconds);
+  EXPECT_NEAR(2.0, r_days, epsilon);
+  EXPECT_NEAR(813.0, r_minutes, epsilon);
+  EXPECT_NEAR(9369.0, r_milliseconds, epsilon);
+}