gstreamer/gst-libs/gst/gl/x11/gstgldisplay_x11.c
Matthew Waters d79d742492 gl/display: Add thread-safe retrieve_window
Returning a transfer none value for a value checked by a lock is not
thread safe as the reference could disappear before the caller can take
its reference.
2019-11-06 01:07:26 +00:00

255 lines
7.3 KiB
C

/*
* GStreamer
* Copyright (C) 2013 Matthew Waters <ystreet00@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstgldisplay_x11
* @short_description: X11 Display connection
* @title: GstGLDisplayX11
* @see_also: #GstGLDisplay
*
* #GstGLDisplayX11 represents a connection to an X11 `Display` handle created
* internally (gst_gl_display_x11_new()) or wrapped by the application
* (gst_gl_display_x11_new_with_display())
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gl/x11/gstgldisplay_x11.h>
#include <gst/gl/x11/gstglwindow_x11.h>
#include "xcb_event_source.h"
GST_DEBUG_CATEGORY_STATIC (gst_gl_display_debug);
#define GST_CAT_DEFAULT gst_gl_display_debug
G_DEFINE_TYPE (GstGLDisplayX11, gst_gl_display_x11, GST_TYPE_GL_DISPLAY);
static void gst_gl_display_x11_finalize (GObject * object);
static guintptr gst_gl_display_x11_get_handle (GstGLDisplay * display);
static gboolean gst_gl_display_x11_get_foreign_display (GstGLDisplay * display);
G_GNUC_INTERNAL
gboolean gst_gl_display_x11_handle_event (GstGLDisplayX11 * display_x11);
extern gboolean gst_gl_window_x11_handle_event (GstGLWindowX11 * window_x11,
xcb_generic_event_t * event);
static void
gst_gl_display_x11_class_init (GstGLDisplayX11Class * klass)
{
GST_GL_DISPLAY_CLASS (klass)->get_handle =
GST_DEBUG_FUNCPTR (gst_gl_display_x11_get_handle);
GST_GL_DISPLAY_CLASS (klass)->get_foreign_display =
GST_DEBUG_FUNCPTR (gst_gl_display_x11_get_foreign_display);
G_OBJECT_CLASS (klass)->finalize = gst_gl_display_x11_finalize;
}
static void
gst_gl_display_x11_init (GstGLDisplayX11 * display_x11)
{
GstGLDisplay *display = (GstGLDisplay *) display_x11;
display->type = GST_GL_DISPLAY_TYPE_X11;
display_x11->foreign_display = FALSE;
}
static void
gst_gl_display_x11_finalize (GObject * object)
{
GstGLDisplayX11 *display_x11 = GST_GL_DISPLAY_X11 (object);
g_free (display_x11->name);
if (!display_x11->foreign_display && display_x11->display) {
XSync (display_x11->display, FALSE);
XCloseDisplay (display_x11->display);
}
G_OBJECT_CLASS (gst_gl_display_x11_parent_class)->finalize (object);
}
/**
* gst_gl_display_x11_new:
* @name: (allow-none): a display name
*
* Create a new #GstGLDisplayX11 from the x11 display name. See `XOpenDisplay`()
* for details on what is a valid name.
*
* Returns: (transfer full): a new #GstGLDisplayX11 or %NULL
*/
GstGLDisplayX11 *
gst_gl_display_x11_new (const gchar * name)
{
GstGLDisplayX11 *ret;
GST_DEBUG_CATEGORY_GET (gst_gl_display_debug, "gldisplay");
ret = g_object_new (GST_TYPE_GL_DISPLAY_X11, NULL);
gst_object_ref_sink (ret);
ret->name = g_strdup (name);
ret->display = XOpenDisplay (ret->name);
if (!ret->display) {
GST_INFO ("Failed to open X11 display connection with name, \'%s\'", name);
gst_object_unref (ret);
return NULL;
}
ret->xcb_connection = XGetXCBConnection (ret->display);
if (!ret->xcb_connection) {
GST_ERROR ("Failed to retrieve XCB connection from X11 Display");
gst_object_unref (ret);
return NULL;
}
XSetEventQueueOwner (ret->display, XCBOwnsEventQueue);
GST_GL_DISPLAY (ret)->event_source = xcb_event_source_new (ret);
g_source_attach (GST_GL_DISPLAY (ret)->event_source,
GST_GL_DISPLAY (ret)->main_context);
return ret;
}
/**
* gst_gl_display_x11_new_with_display:
* @display: an existing, x11 display
*
* Creates a new display connection from a X11 Display.
*
* Returns: (transfer full): a new #GstGLDisplayX11
*/
GstGLDisplayX11 *
gst_gl_display_x11_new_with_display (Display * display)
{
GstGLDisplayX11 *ret;
g_return_val_if_fail (display != NULL, NULL);
GST_DEBUG_CATEGORY_GET (gst_gl_display_debug, "gldisplay");
ret = g_object_new (GST_TYPE_GL_DISPLAY_X11, NULL);
gst_object_ref_sink (ret);
ret->name = g_strdup (DisplayString (display));
ret->display = display;
ret->xcb_connection = XGetXCBConnection (ret->display);
if (!ret->xcb_connection) {
GST_ERROR ("Failed to retrieve XCB connection from X11 Display");
gst_object_unref (ret);
return NULL;
}
ret->foreign_display = TRUE;
return ret;
}
static guintptr
gst_gl_display_x11_get_handle (GstGLDisplay * display)
{
return (guintptr) GST_GL_DISPLAY_X11 (display)->display;
}
static gboolean
gst_gl_display_x11_get_foreign_display (GstGLDisplay * display)
{
return GST_GL_DISPLAY_X11 (display)->foreign_display;
}
static int
_compare_xcb_window (GstGLWindowX11 * window_x11, xcb_window_t * window_id)
{
return window_x11->internal_win_id - *window_id;
}
static GstGLWindowX11 *
_find_window_from_xcb_window (GstGLDisplayX11 * display_x11,
xcb_window_t window_id)
{
GstGLDisplay *display = GST_GL_DISPLAY (display_x11);
GstGLWindow *window = NULL;
if (!window_id)
return NULL;
window = gst_gl_display_retrieve_window (display, &window_id,
(GCompareFunc) _compare_xcb_window);
return (GstGLWindowX11 *) window;
}
static GstGLWindowX11 *
_window_from_event (GstGLDisplayX11 * display_x11, xcb_generic_event_t * event)
{
uint8_t event_code = event->response_type & 0x7f;
switch (event_code) {
/* *INDENT-OFF* */
#define WIN_FROM_EVENT(case_val,event_type,window_field) \
case case_val:{ \
event_type * real_event = (event_type *) event; \
return _find_window_from_xcb_window (display_x11, real_event->window_field); \
}
WIN_FROM_EVENT (XCB_CLIENT_MESSAGE, xcb_client_message_event_t, window)
WIN_FROM_EVENT (XCB_CONFIGURE_NOTIFY, xcb_configure_notify_event_t, window)
WIN_FROM_EVENT (XCB_EXPOSE, xcb_expose_event_t, window)
WIN_FROM_EVENT (XCB_KEY_PRESS, xcb_key_press_event_t, event)
WIN_FROM_EVENT (XCB_KEY_RELEASE, xcb_key_release_event_t, event)
WIN_FROM_EVENT (XCB_BUTTON_PRESS, xcb_button_press_event_t, event)
WIN_FROM_EVENT (XCB_BUTTON_RELEASE, xcb_button_release_event_t, event)
WIN_FROM_EVENT (XCB_MOTION_NOTIFY, xcb_motion_notify_event_t, event)
#undef WIN_FROM_EVENT
/* *INDENT-ON* */
default:
return NULL;
}
}
gboolean
gst_gl_display_x11_handle_event (GstGLDisplayX11 * display_x11)
{
xcb_connection_t *connection = display_x11->xcb_connection;
xcb_generic_event_t *event;
gboolean ret = TRUE;
while ((event = xcb_poll_for_event (connection))) {
GstGLWindowX11 *window_x11 = _window_from_event (display_x11, event);
GST_TRACE_OBJECT (display_x11, "got event %p to window %" GST_PTR_FORMAT,
event, window_x11);
if (window_x11) {
ret = gst_gl_window_x11_handle_event (window_x11, event);
} else {
/* unknown window, ignore */
ret = TRUE;
}
if (window_x11)
gst_object_unref (window_x11);
g_free (event);
}
return ret;
}