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mixer-control: Don't specify default c_marshaller

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Apart from being less code, this actually gives us a tiny performance
improvement. Up until a few years ago, if you pass `NULL` as the
marshaller for a signal, GLib would fall back to
`g_cclosure_marshal_generic` which uses libffi to pack/unpack its
arguments. One could avoid this by specifying a more specific
marshaller which would then be used to immediately pack and unpack into
GValues with the correct type.

Lately however, as a way of optimizing signal emission (which can be
quite expensive), GLib added a possibility to set a `va_marshaller`,
which skips the unnecessary GValue packing and unpacking and just uses a
valist variant.

Since the performance difference is big enough, if the marshaller
argument is NULL, `g_signal_new()` will now check for the simple
marshallers (return type NONE and a single argument) and set both the
generic and the valist marshaller. In other words, less code for us with
behind-the-scenes optimizations.

In case you also want va_marshallers for more complex signals, you can
use `g_signal_set_va_marshaller()`.
This commit is contained in:
Niels De Graef 2022-05-29 13:47:33 +02:00 committed by Bastien Nocera
parent dc5fd4f15e
commit 9fa985ca25
1 changed files with 15 additions and 30 deletions
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45
gvc-mixer-control.c
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@ -3707,120 +3707,105 @@ gvc_mixer_control_class_init (GvcMixerControlClass *klass)
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, state_changed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [STREAM_ADDED] =
g_signal_new ("stream-added",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, stream_added),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [STREAM_REMOVED] =
g_signal_new ("stream-removed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, stream_removed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [STREAM_CHANGED] =
g_signal_new ("stream-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, stream_changed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [AUDIO_DEVICE_SELECTION_NEEDED] =
g_signal_new ("audio-device-selection-needed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
g_cclosure_marshal_generic,
NULL, NULL, NULL,
G_TYPE_NONE, 3, G_TYPE_UINT, G_TYPE_BOOLEAN, G_TYPE_UINT);
signals [CARD_ADDED] =
g_signal_new ("card-added",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, card_added),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [CARD_REMOVED] =
g_signal_new ("card-removed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, card_removed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [DEFAULT_SINK_CHANGED] =
g_signal_new ("default-sink-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, default_sink_changed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [DEFAULT_SOURCE_CHANGED] =
g_signal_new ("default-source-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, default_source_changed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [ACTIVE_OUTPUT_UPDATE] =
g_signal_new ("active-output-update",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, active_output_update),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [ACTIVE_INPUT_UPDATE] =
g_signal_new ("active-input-update",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, active_input_update),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [OUTPUT_ADDED] =
g_signal_new ("output-added",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, output_added),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [INPUT_ADDED] =
g_signal_new ("input-added",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, input_added),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [OUTPUT_REMOVED] =
g_signal_new ("output-removed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, output_removed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
signals [INPUT_REMOVED] =
g_signal_new ("input-removed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GvcMixerControlClass, input_removed),
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
}