shared: introduce timespec-util.h

Copyright is set according to the moved code from compositor.c.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

Makefile.am

@@ -90,6 +90,7 @@ weston_SOURCES =					\
 	shared/helpers.h				\
 	shared/matrix.c					\
 	shared/matrix.h					\
+	shared/timespec-util.h				\
 	shared/zalloc.h					\
 	shared/platform.h				\
 	src/weston-egl-ext.h

shared/timespec-util.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright © 2014 - 2015 Collabora, Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef TIMESPEC_UTIL_H
+#define TIMESPEC_UTIL_H
+
+#define NSEC_PER_SEC 1000000000
+
+/* Subtract timespecs
+ *
+ * \param r[out] result: a - b
+ * \param a[in] operand
+ * \param b[in] operand
+ */
+static inline void
+timespec_sub(struct timespec *r,
+	     const struct timespec *a, const struct timespec *b)
+{
+	r->tv_sec = a->tv_sec - b->tv_sec;
+	r->tv_nsec = a->tv_nsec - b->tv_nsec;
+	if (r->tv_nsec < 0) {
+		r->tv_sec--;
+		r->tv_nsec += NSEC_PER_SEC;
+	}
+}
+
+/* Convert timespec to nanoseconds
+ *
+ * \param a timespec
+ * \return nanoseconds
+ */
+static inline int64_t
+timespec_to_nsec(const struct timespec *a)
+{
+	return (int64_t)a->tv_sec * NSEC_PER_SEC + a->tv_nsec;
+}
+
+
+#endif /* TIMESPEC_UTIL_H */

src/compositor.c

@@ -58,31 +58,12 @@
 #include "presentation_timing-server-protocol.h"
 #include "shared/helpers.h"
 #include "shared/os-compatibility.h"
+#include "shared/timespec-util.h"
 #include "git-version.h"
 #include "version.h"
 
 #define DEFAULT_REPAINT_WINDOW 7 /* milliseconds */
 
-#define NSEC_PER_SEC 1000000000
-
-static void
-timespec_sub(struct timespec *r,
-	     const struct timespec *a, const struct timespec *b)
-{
-	r->tv_sec = a->tv_sec - b->tv_sec;
-	r->tv_nsec = a->tv_nsec - b->tv_nsec;
-	if (r->tv_nsec < 0) {
-		r->tv_sec--;
-		r->tv_nsec += NSEC_PER_SEC;
-	}
-}
-
-static int64_t
-timespec_to_nsec(const struct timespec *a)
-{
-	return (int64_t)a->tv_sec * NSEC_PER_SEC + a->tv_nsec;
-}
-
 static void
 weston_output_transform_scale_init(struct weston_output *output,
 				   uint32_t transform, uint32_t scale);