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navigation: Add coordinate helper functions

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Add a function to get x/y coordinates from suitable navigation events,
and one to create a copy with given coordinate values.

For e.g. translating event coordinates, this avoids having to either
switch on the event type to select the right parse function, or
having to rely on implementation details of the underlying event
structure.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1633>
This commit is contained in:
Vivienne Watermeier 2022-02-14 14:22:29 +01:00 committed by GStreamer Marge Bot
parent 8648275601
commit f402b2e180
2 changed files with 83 additions and 0 deletions
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75
subprojects/gst-plugins-base/gst-libs/gst/video/navigation.c
View file

@ -1103,3 +1103,78 @@ gst_navigation_event_parse_command (GstEvent * event,
return ret;
}
/**
* gst_navigation_event_get_coordinates:
* @event: The #GstEvent to inspect.
* @x: (out) (optional): Pointer to a gdouble to receive the x coordinate of the
* navigation event.
* @y: (out) (optional): Pointer to a gdouble to receive the y coordinate of the
* navigation event.
*
* Try to retrieve x and y coordinates of a #GstNavigation event.
*
* Returns: A boolean indicating success.
*
* Since: 1.22
*/
gboolean
gst_navigation_event_get_coordinates (GstEvent * event,
gdouble * x, gdouble * y)
{
GstNavigationEventType e_type;
const GstStructure *s;
gboolean ret = TRUE;
e_type = gst_navigation_event_get_type (event);
if (e_type != GST_NAVIGATION_EVENT_MOUSE_MOVE
&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS
&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE) {
return FALSE;
}
s = gst_event_get_structure (event);
if (x)
ret &= gst_structure_get_double (s, "pointer_x", x);
if (y)
ret &= gst_structure_get_double (s, "pointer_y", y);
WARN_IF_FAIL (ret, "Couldn't extract coordinates from the event");
return ret;
}
/**
* gst_navigation_event_set_coordinates:
* @event: The #GstEvent to modify.
* @x: The x coordinate to set.
* @y: The y coordinate to set.
*
* Try to set x and y coordinates on a #GstNavigation event. The event must
* be writable.
*
* Returns: A boolean indicating success.
*
* Since: 1.22
*/
gboolean
gst_navigation_event_set_coordinates (GstEvent * event, gdouble x, gdouble y)
{
GstNavigationEventType e_type;
GstStructure *s;
g_return_val_if_fail (gst_event_is_writable (event), FALSE);
e_type = gst_navigation_event_get_type (event);
if (e_type != GST_NAVIGATION_EVENT_MOUSE_MOVE
&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS
&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE) {
return FALSE;
}
s = gst_event_writable_structure (event);
gst_structure_set (s, "pointer_x", G_TYPE_DOUBLE, x,
"pointer_y", G_TYPE_DOUBLE, y, NULL);
return TRUE;
}

8
subprojects/gst-plugins-base/gst-libs/gst/video/navigation.h
View file

@ -353,6 +353,14 @@ GST_VIDEO_API
gboolean gst_navigation_event_parse_command (GstEvent *event,
GstNavigationCommand *command);
GST_VIDEO_API
gboolean gst_navigation_event_get_coordinates (GstEvent * event,
gdouble * x, gdouble * y);
GST_VIDEO_API
gboolean gst_navigation_event_set_coordinates (GstEvent * event,
gdouble x, gdouble y);
/* interface virtual function wrappers */
GST_VIDEO_DEPRECATED_FOR(gst_navigation_send_event_simple)