1 files changed, 22 insertions, 0 deletions
diff --git a/src/3rdparty/autotrace/epsilon-equal.c b/src/3rdparty/autotrace/epsilon-equal.c
new file mode 100644
index 0000000..8d26886
--- /dev/null
+++ b/src/3rdparty/autotrace/epsilon-equal.c
@@ -0,0 +1,22 @@
+/* epsilon-equal.c: define a error resist compare. */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* Def: HAVE_CONFIG_H */
+
+#include "types.h"
+#include "epsilon-equal.h"
+#include <math.h>
+
+/* Numerical errors sometimes make a floating point number just slightly
+   larger or smaller than its TRUE value.  When it matters, we need to
+   compare with some tolerance, REAL_EPSILON, defined in kbase.h.  */
+
+gboolean epsilon_equal(gfloat v1, gfloat v2)
+{
+  if (v1 == v2                  /* Usually they'll be exactly equal, anyway.  */
+      || fabs(v1 - v2) <= REAL_EPSILON)
+    return TRUE;
+
+  return FALSE;
+}