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39e4aa3c57
Apart from being less code, this actually gives us a nice 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 bigger optimizations. In case you also want va_marshallers for more complex signals, you can use `g_signal_set_va_marshaller()`.
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpcancelable.c
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* Copyright (C) 2018 Ell
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "core-types.h"
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#include "gimpcancelable.h"
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#include "gimpmarshal.h"
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enum
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{
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CANCEL,
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LAST_SIGNAL
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};
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G_DEFINE_INTERFACE (GimpCancelable, gimp_cancelable, G_TYPE_OBJECT)
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static guint cancelable_signals[LAST_SIGNAL] = { 0 };
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/* private functions */
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static void
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gimp_cancelable_default_init (GimpCancelableInterface *iface)
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{
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cancelable_signals[CANCEL] =
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g_signal_new ("cancel",
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G_TYPE_FROM_CLASS (iface),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GimpCancelableInterface, cancel),
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NULL, NULL, NULL,
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G_TYPE_NONE, 0);
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}
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/* public functions */
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void
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gimp_cancelable_cancel (GimpCancelable *cancelable)
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{
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g_return_if_fail (GIMP_IS_CANCELABLE (cancelable));
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g_signal_emit (cancelable, cancelable_signals[CANCEL], 0);
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}
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