GstGLWindow

GstGLWindow — window/surface abstraction

Functions

GQuark gst_gl_window_error_quark ()
#define GST_GL_WINDOW_ERROR
void (*GstGLWindowResizeCB) ()
#define GST_GL_WINDOW_RESIZE_CB()
void (*GstGLWindowCB) ()
#define GST_GL_WINDOW_CB()
GstGLWindow * gst_gl_window_new ()
void gst_gl_window_draw ()
gboolean gst_gl_window_is_running ()
void gst_gl_window_quit ()
void gst_gl_window_run ()
GstGLContext * gst_gl_window_get_context ()
guintptr gst_gl_window_get_display ()
void gst_gl_window_send_message ()
void gst_gl_window_send_message_async ()
void gst_gl_window_set_close_callback ()
void gst_gl_window_set_draw_callback ()
void gst_gl_window_set_resize_callback ()
void gst_gl_window_set_window_handle ()
guintptr gst_gl_window_get_window_handle ()
void gst_gl_window_set_preferred_size ()
void gst_gl_window_show ()
void gst_gl_window_get_surface_dimensions ()
void gst_gl_window_handle_events ()

Signals

void key-event Run Last
void mouse-event Run Last

Types and Values

enum GstGLWindowError
  GstGLWindow
  GstGLWindowClass

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstGLWindow

Description

GstGLWindow represents a window that elements can render into. A window can either be a user visible window (onscreen) or hidden (offscreen).

Functions

gst_gl_window_error_quark ()

GQuark
gst_gl_window_error_quark (void);

GST_GL_WINDOW_ERROR

#define GST_GL_WINDOW_ERROR (gst_gl_window_error_quark ())

GstGLWindowResizeCB ()

void
(*GstGLWindowResizeCB) (gpointer data,
                        guint width,
                        guint height);

GST_GL_WINDOW_RESIZE_CB()

#define GST_GL_WINDOW_RESIZE_CB(f)		 ((GstGLWindowResizeCB) (f))

GstGLWindowCB ()

void
(*GstGLWindowCB) (gpointer data);

GST_GL_WINDOW_CB()

#define GST_GL_WINDOW_CB(f)			 ((GstGLWindowCB) (f))

gst_gl_window_new ()

GstGLWindow *
gst_gl_window_new (GstGLDisplay *display);

Parameters

display

a GstGLDisplay

  

Returns

a new GstGLWindow using display 's connection.

[transfer full]

Since: 1.4

gst_gl_window_draw ()

void
gst_gl_window_draw (GstGLWindow *window);

Redraw the window contents. Implementations should invoke the draw callback.

Parameters

window

a GstGLWindow

  

Since: 1.4

gst_gl_window_is_running ()

gboolean
gst_gl_window_is_running (GstGLWindow *window);

Whether the runloop is running

Parameters

window

a GstGLWindow

  

Since: 1.4

gst_gl_window_quit ()

void
gst_gl_window_quit (GstGLWindow *window);

Quit the runloop's execution.

Parameters

window

a GstGLWindow

  

Since: 1.4

gst_gl_window_run ()

void
gst_gl_window_run (GstGLWindow *window);

Start the execution of the runloop.

Parameters

window

a GstGLWindow

  

Since: 1.4

gst_gl_window_get_context ()

GstGLContext *
gst_gl_window_get_context (GstGLWindow *window);

Parameters

window

a GstGLWindow

  

Returns

the GstGLContext associated with this window .

[transfer full]

Since: 1.4

gst_gl_window_get_display ()

guintptr
gst_gl_window_get_display (GstGLWindow *window);

Parameters

window

a GstGLWindow

  

Returns

the windowing system display handle for this window

Since: 1.4

gst_gl_window_send_message ()

void
gst_gl_window_send_message (GstGLWindow *window,
                            GstGLWindowCB callback,
                            gpointer data);

Invoke callback with data on the window thread. callback is guarenteed to have executed when this function returns.

Parameters

window

a GstGLWindow

  

callback

function to invoke.

[scope async]

data

data to invoke callback with.

[closure]

Since: 1.4

gst_gl_window_send_message_async ()

void
gst_gl_window_send_message_async (GstGLWindow *window,
                                  GstGLWindowCB callback,
                                  gpointer data,
                                  GDestroyNotify destroy);

Invoke callback with data on the window thread. The callback may not have been executed when this function returns.

Parameters

window

a GstGLWindow

  

callback

function to invoke.

[scope async]

data

data to invoke callback with.

[closure]

destroy

called when data is not needed anymore.

[destroy]

Since: 1.4

gst_gl_window_set_close_callback ()

void
gst_gl_window_set_close_callback (GstGLWindow *window,
                                  GstGLWindowCB callback,
                                  gpointer data,
                                  GDestroyNotify destroy_notify);

Sets the callback called when the window is about to close.

Parameters

window

a GstGLWindow

  

callback

function to invoke.

[scope notified]

data

data to invoke callback with.

[closure]

destroy_notify

called when data is not needed any more.

[destroy]

Since: 1.4

gst_gl_window_set_draw_callback ()

void
gst_gl_window_set_draw_callback (GstGLWindow *window,
                                 GstGLWindowCB callback,
                                 gpointer data,
                                 GDestroyNotify destroy_notify);

Sets the draw callback called everytime gst_gl_window_draw() is called

Parameters

window

a GstGLWindow

  

callback

function to invoke.

[scope notified]

data

data to invoke callback with.

[closure]

destroy_notify

called when data is not needed any more.

[destroy]

Since: 1.4

gst_gl_window_set_resize_callback ()

void
gst_gl_window_set_resize_callback (GstGLWindow *window,
                                   GstGLWindowResizeCB callback,
                                   gpointer data,
                                   GDestroyNotify destroy_notify);

Sets the resize callback called everytime a resize of the window occurs.

Parameters

window

a GstGLWindow

  

callback

function to invoke.

[scope notified]

data

data to invoke callback with.

[closure]

destroy_notify

called when data is not needed any more.

[destroy]

Since: 1.4

gst_gl_window_set_window_handle ()

void
gst_gl_window_set_window_handle (GstGLWindow *window,
                                 guintptr handle);

Sets the window that this window should render into. Some implementations require this to be called with a valid handle before drawing can commence.

Parameters

window

a GstGLWindow

  

handle

handle to the window

  

Since: 1.4

gst_gl_window_get_window_handle ()

guintptr
gst_gl_window_get_window_handle (GstGLWindow *window);

Parameters

window

a GstGLWindow

  

Returns

the window handle we are currently rendering into

Since: 1.4

gst_gl_window_set_preferred_size ()

void
gst_gl_window_set_preferred_size (GstGLWindow *window,
                                  gint width,
                                  gint height);

Set the preferred width and height of the window. Implementations are free to ignore this information.

Parameters

window

a GstGLWindow

  

width

new preferred width

  

height

new preferred height

  

Since: 1.6

gst_gl_window_show ()

void
gst_gl_window_show (GstGLWindow *window);

Present the window to the screen.

Parameters

window

a GstGLWindow

  

Since: 1.6

gst_gl_window_get_surface_dimensions ()

void
gst_gl_window_get_surface_dimensions (GstGLWindow *window,
                                      guint *width,
                                      guint *height);

Parameters

window

a GstGLWindow

  

width

resulting surface width.

[out]

height

resulting surface height.

[out]

Since: 1.6

gst_gl_window_handle_events ()

void
gst_gl_window_handle_events (GstGLWindow *window,
                             gboolean handle_events);

Tell a window that it should handle events from the window system. These events are forwarded upstream as navigation events. In some window systems events are not propagated in the window hierarchy if a client is listening for them. This method allows you to disable events handling completely from the window .

Parameters

window

a GstGLWindow

  

handle_events

a gboolean indicating if events should be handled or not.

  

Types and Values

enum GstGLWindowError

Members

GST_GL_WINDOW_ERROR_FAILED

    

GST_GL_WINDOW_ERROR_OLD_LIBS

    

GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE

    

GstGLWindow

typedef struct _GstGLWindow GstGLWindow;

GstGLWindow is an opaque struct and should only be accessed through the provided api.

GstGLWindowClass

typedef struct {
  GstObjectClass parent_class;

  guintptr (*get_display)        (GstGLWindow *window);
  void     (*set_window_handle)  (GstGLWindow *window, guintptr id);
  guintptr (*get_window_handle)  (GstGLWindow *window);
  void     (*draw)               (GstGLWindow *window);
  void     (*run)                (GstGLWindow *window);
  void     (*quit)               (GstGLWindow *window);
  void     (*send_message)       (GstGLWindow *window, GstGLWindowCB callback, gpointer data);
  void     (*send_message_async) (GstGLWindow *window, GstGLWindowCB callback, gpointer data, GDestroyNotify destroy);

  gboolean (*open)               (GstGLWindow *window, GError **error);
  void     (*close)              (GstGLWindow *window);
  void     (*handle_events)      (GstGLWindow *window, gboolean handle_events);
  void     (*set_preferred_size) (GstGLWindow *window, gint width, gint height);
  void     (*show)               (GstGLWindow *window);
  gboolean (*set_render_rectangle)(GstGLWindow *window, gint x, gint y, gint width, gint height);
  void     (*queue_resize)       (GstGLWindow *window);
} GstGLWindowClass;

Members

GstObjectClass parent_class;

Parent class

  

get_display ()

Gets the current windowing system display connection

  

set_window_handle ()

Set a window to render into

  

get_window_handle ()

Gets the current window that this GstGLWindow is rendering into

  

draw ()

redraw the window with the specified dimensions

  

run ()

run the mainloop

  

quit ()

send a quit to the mainloop

  

send_message ()

invoke a function on the window thread. Required to be reentrant.

  

send_message_async ()

invoke a function on the window thread. run may or may not have been called. Required to be reentrant.

  

open ()

open the connection to the display

  

close ()

close the connection to the display

  

handle_events ()

whether to handle 'extra' events from the windowing system. Basic events like surface moves and resizes are still valid things to listen for.

  

set_preferred_size ()

request that the window change surface size. The implementation is free to ignore this information.

  

show ()

    

set_render_rectangle ()

    

queue_resize ()

    

Signal Details

The “key-event” signal

void
user_function (GstGLWindow *object,
               gchar       *id,
               gchar       *key,
               gpointer     user_data)

Will be emitted when a key event is received by the GstGLwindow.

Parameters

object

the GstGLWindow

  

id

the name of the event

  

key

the id of the key pressed

  

user_data

user data set when the signal handler was connected.

  

Flags: Run Last

Since: 1.6

The “mouse-event” signal

void
user_function (GstGLWindow *object,
               gchar       *id,
               gint         button,
               gdouble      x,
               gdouble      y,
               gpointer     user_data)

Will be emitted when a mouse event is received by the GstGLwindow.

Parameters

object

the GstGLWindow

  

id

the name of the event

  

button

the id of the button

  

x

the x coordinate of the mouse event

  

y

the y coordinate of the mouse event

  

user_data

user data set when the signal handler was connected.

  

Flags: Run Last

Since: 1.6

See Also

GstGLContext, GstGLDisplay

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