X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fpbd%2Fmsvc%2Fmsvc_pbd.cc;h=ab79d8f45de8950213ef467112d5e8879c34a600;hb=a7df009de73ad38026ff97d9aeafb8e2aa22e627;hp=5b9c9d449af94bfc57eec0d2f0fcc7fe6a595a39;hpb=23e7cf10191270d70357ccf0ed9294f020c7b7ab;p=ardour.git

diff --git a/libs/pbd/msvc/msvc_pbd.cc b/libs/pbd/msvc/msvc_pbd.cc
index 5b9c9d449a..ab79d8f45d 100644
--- a/libs/pbd/msvc/msvc_pbd.cc
+++ b/libs/pbd/msvc/msvc_pbd.cc
@@ -241,6 +241,46 @@ round(double x)
 	return (floor(x));
 }
 
+//***************************************************************
+//
+//	trunc()
+//
+// Emulates trunc() using floor() and ceil().
+//
+//	Returns:
+//
+//    On Success: The largest integer whose magnitude is less
+//                than or equal to 'x' (regardless of sign).
+//    On Failure: None
+//
+LIBPBD_API double PBD_APICALLTYPE
+trunc(double x)
+{
+	if (x < 0)
+		return (ceil(x));
+
+	return (floor(x));
+}
+
+//***************************************************************
+//
+//	log2()
+//
+// Emulates C99 log2() using log().
+//
+//	Returns:
+//
+//    On Success: The binary (base-2) logarithm of 'x'
+//                (e.g. log2(1024) == 10).
+//    On Failure: None, except that calling log(x) should generate
+//                an appropriate error for us (such as ERANGE etc).
+//
+LIBPBD_API double PBD_APICALLTYPE
+log2(double x)
+{
+	return (log(x) / log((double)2.0));
+}
+
 namespace PBD {
 
 //***************************************************************