From 0f0bdee4acf9475844207e0eb18bdd6c3b9e2234 Mon Sep 17 00:00:00 2001
From: Christian Hergert <chergert@redhat.com>
Date: Tue, 14 May 2019 13:07:09 -0700
Subject: [PATCH] libsysprof-ui: add some helpers to zoom manager

This should be able to help us cleanup some duplicated code in various
places so that we keep our timings associated amongst different visualizing
widgets.
---
 src/libsysprof-ui/sysprof-zoom-manager.c | 39 +++++++++++++++---------
 src/libsysprof-ui/sysprof-zoom-manager.h |  6 ++++
 2 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/src/libsysprof-ui/sysprof-zoom-manager.c b/src/libsysprof-ui/sysprof-zoom-manager.c
index ed7b0456..cdb0665e 100644
--- a/src/libsysprof-ui/sysprof-zoom-manager.c
+++ b/src/libsysprof-ui/sysprof-zoom-manager.c
@@ -27,6 +27,9 @@
 
 #include "sysprof-zoom-manager.h"
 
+#define DEFAULT_PIXELS_PER_SEC (20.0)
+#define NSEC_PER_SEC G_GINT64_CONSTANT(1000000000)
+
 struct _SysprofZoomManager
 {
   GObject parent_instance;
@@ -56,21 +59,9 @@ G_DEFINE_TYPE_EXTENDED (SysprofZoomManager, sysprof_zoom_manager, G_TYPE_OBJECT,
 
 static GParamSpec *properties [N_PROPS];
 static gdouble zoom_levels[] = {
-  0.3,
-  0.5,
-  0.67,
-  0.80,
-  0.90,
-  1.0,
-  1.5,
-  2.0,
-  2.5,
-  3.0,
-  5.0,
-  10.0,
-  20.0,
-  30.0,
-  50.0,
+  0.3, 0.5, 0.67, 0.80, 0.90,
+  1.0, 1.5, 2.0, 2.5, 3.0,
+  5.0, 10.0, 20.0, 30.0, 50.0,
 };
 
 static void
@@ -506,3 +497,21 @@ sysprof_zoom_manager_get_zoom_label (SysprofZoomManager *self)
   else
     return g_strdup_printf ("%d%%", (gint)percent);
 }
+
+gint64
+sysprof_zoom_manager_get_duration_for_width (SysprofZoomManager *self,
+                                             gint                width)
+{
+  g_return_val_if_fail (SYSPROF_IS_ZOOM_MANAGER (self), 0);
+
+  return NSEC_PER_SEC * ((gdouble)width / (DEFAULT_PIXELS_PER_SEC * self->zoom));
+}
+
+gint
+sysprof_zoom_manager_get_width_for_duration (SysprofZoomManager *self,
+                                             gint64              duration)
+{
+  g_return_val_if_fail (SYSPROF_IS_ZOOM_MANAGER (self), 0);
+
+  return (gdouble)duration / (gdouble)NSEC_PER_SEC * DEFAULT_PIXELS_PER_SEC * self->zoom;
+}
diff --git a/src/libsysprof-ui/sysprof-zoom-manager.h b/src/libsysprof-ui/sysprof-zoom-manager.h
index 62aa45e6..4c7859b7 100644
--- a/src/libsysprof-ui/sysprof-zoom-manager.h
+++ b/src/libsysprof-ui/sysprof-zoom-manager.h
@@ -64,5 +64,11 @@ void                sysprof_zoom_manager_set_zoom         (SysprofZoomManager *s
                                                            gdouble             zoom);
 SYSPROF_AVAILABLE_IN_ALL
 gchar              *sysprof_zoom_manager_get_zoom_label   (SysprofZoomManager *self);
+SYSPROF_AVAILABLE_IN_ALL
+gint                sysprof_zoom_manager_get_width_for_duration (SysprofZoomManager *self,
+                                                                 gint64              duration);
+SYSPROF_AVAILABLE_IN_ALL
+gint64              sysprof_zoom_manager_get_duration_for_width (SysprofZoomManager *self,
+                                                                 gint                width);
 
 G_END_DECLS