gdk_pixbuf: allow per feature registration

Split plugin into features including
dynamic types which can be indiviually
registered during a static build.

More details here:

https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/199
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/661

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/876>

ext/gdk_pixbuf/gstgdkpixbufdec.c

@@ -27,6 +27,7 @@
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <string.h>
 
+#include "gstgdkpixbufelements.h"
 #include "gstgdkpixbufdec.h"
 
 GST_DEBUG_CATEGORY_STATIC (gdkpixbufdec_debug);
@@ -74,6 +75,9 @@ static gboolean gst_gdk_pixbuf_dec_sink_event (GstPad * pad, GstObject * parent,
 
 #define gst_gdk_pixbuf_dec_parent_class parent_class
 G_DEFINE_TYPE (GstGdkPixbufDec, gst_gdk_pixbuf_dec, GST_TYPE_ELEMENT);
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (gdkpixbufdec, "gdkpixbufdec",
+    GST_RANK_SECONDARY, GST_TYPE_GDK_PIXBUF_DEC,
+    gdk_pixbuf_element_init (plugin));
 
 static gboolean
 gst_gdk_pixbuf_dec_sink_setcaps (GstGdkPixbufDec * filter, GstCaps * caps)

ext/gdk_pixbuf/gstgdkpixbufelement.c

@@ -0,0 +1,89 @@
+/* GStreamer GdkPixbuf plugin
+ * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2003 David A. Schleef <ds@schleef.org>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+
+#include "gstgdkpixbufelements.h"
+
+#if 0
+static void gst_gdk_pixbuf_type_find (GstTypeFind * tf, gpointer ignore);
+
+#define GST_GDK_PIXBUF_TYPE_FIND_SIZE 1024
+
+static void
+gst_gdk_pixbuf_type_find (GstTypeFind * tf, gpointer ignore)
+{
+  guint8 *data;
+  GdkPixbufLoader *pixbuf_loader;
+  GdkPixbufFormat *format;
+
+  data = gst_type_find_peek (tf, 0, GST_GDK_PIXBUF_TYPE_FIND_SIZE);
+  if (data == NULL)
+    return;
+
+  GST_DEBUG ("creating new loader");
+
+  pixbuf_loader = gdk_pixbuf_loader_new ();
+
+  gdk_pixbuf_loader_write (pixbuf_loader, data, GST_GDK_PIXBUF_TYPE_FIND_SIZE,
+      NULL);
+
+  format = gdk_pixbuf_loader_get_format (pixbuf_loader);
+
+  if (format != NULL) {
+    GstCaps *caps;
+    gchar **p;
+    gchar **mlist = gdk_pixbuf_format_get_mime_types (format);
+
+    for (p = mlist; *p; ++p) {
+      GST_DEBUG ("suggesting mime type %s", *p);
+      caps = gst_caps_new_simple (*p, NULL);
+      gst_type_find_suggest (tf, GST_TYPE_FIND_MINIMUM, caps);
+      gst_caps_free (caps);
+    }
+    g_strfreev (mlist);
+  }
+
+  GST_DEBUG ("closing pixbuf loader, hope it doesn't hang ...");
+  /* librsvg 2.4.x has a bug where it triggers an endless loop in trying
+     to close a gzip that's not an svg; fixed upstream but no good way
+     to work around it */
+  gdk_pixbuf_loader_close (pixbuf_loader, NULL);
+  GST_DEBUG ("closed pixbuf loader");
+  g_object_unref (G_OBJECT (pixbuf_loader));
+}
+#endif
+
+void
+gdk_pixbuf_element_init (GstPlugin * plugin)
+{
+  static gsize res = FALSE;
+  if (g_once_init_enter (&res)) {
+#if 0
+    gst_type_find_register (plugin, "image/*", GST_RANK_MARGINAL,
+        gst_gdk_pixbuf_type_find, NULL, GST_CAPS_ANY, NULL);
+#endif
+    g_once_init_leave (&res, TRUE);
+  }
+}

ext/gdk_pixbuf/gstgdkpixbufelements.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2003 David A. Schleef <ds@schleef.org>
+ * Copyright (C) 2020 Huawei Technologies Co., Ltd.
+ *   @Author: Julian Bouzas <julian.bouzas@collabora.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.
+ */
+
+#ifndef __GST_GDK_PIXBUF_ELEMENTS_H__
+#define __GST_GDK_PIXBUF_ELEMENTS_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+void gdk_pixbuf_element_init (GstPlugin * plugin);
+
+GST_ELEMENT_REGISTER_DECLARE (gdkpixbufdec);
+GST_ELEMENT_REGISTER_DECLARE (gdkpixbufoverlay);
+GST_ELEMENT_REGISTER_DECLARE (gdkpixbufsink);
+
+G_END_DECLS
+
+#endif /* __GST_GDK_PIXBUF_ELEMENTS_H__ */

ext/gdk_pixbuf/gstgdkpixbufoverlay.c

@@ -49,6 +49,7 @@
 #include <gst/gst.h>
 #include "gstgdkpixbufoverlay.h"
 
+#include "gstgdkpixbufelements.h"
 #include <gst/video/gstvideometa.h>
 
 GST_DEBUG_CATEGORY_STATIC (gdkpixbufoverlay_debug);
@@ -113,6 +114,9 @@ static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
 
 G_DEFINE_TYPE (GstGdkPixbufOverlay, gst_gdk_pixbuf_overlay,
     GST_TYPE_VIDEO_FILTER);
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (gdkpixbufoverlay, "gdkpixbufoverlay",
+    GST_RANK_NONE, GST_TYPE_GDK_PIXBUF_OVERLAY,
+    gdk_pixbuf_element_init (plugin));
 
 #define GST_TYPE_GDK_PIXBUF_POSITIONING_MODE \
     (gst_gdk_pixbuf_positioning_mode_get_type())

ext/gdk_pixbuf/gstgdkpixbufplugin.c

@@ -24,81 +24,19 @@
 
 #include <gst/gst.h>
 
-#include "gstgdkpixbufdec.h"
-#include "gstgdkpixbufoverlay.h"
-#include "gstgdkpixbufsink.h"
+#include "gstgdkpixbufelements.h"
 
 
-#if 0
-static void gst_gdk_pixbuf_type_find (GstTypeFind * tf, gpointer ignore);
-
-#define GST_GDK_PIXBUF_TYPE_FIND_SIZE 1024
-
-static void
-gst_gdk_pixbuf_type_find (GstTypeFind * tf, gpointer ignore)
-{
-  guint8 *data;
-  GdkPixbufLoader *pixbuf_loader;
-  GdkPixbufFormat *format;
-
-  data = gst_type_find_peek (tf, 0, GST_GDK_PIXBUF_TYPE_FIND_SIZE);
-  if (data == NULL)
-    return;
-
-  GST_DEBUG ("creating new loader");
-
-  pixbuf_loader = gdk_pixbuf_loader_new ();
-
-  gdk_pixbuf_loader_write (pixbuf_loader, data, GST_GDK_PIXBUF_TYPE_FIND_SIZE,
-      NULL);
-
-  format = gdk_pixbuf_loader_get_format (pixbuf_loader);
-
-  if (format != NULL) {
-    GstCaps *caps;
-    gchar **p;
-    gchar **mlist = gdk_pixbuf_format_get_mime_types (format);
-
-    for (p = mlist; *p; ++p) {
-      GST_DEBUG ("suggesting mime type %s", *p);
-      caps = gst_caps_new_simple (*p, NULL);
-      gst_type_find_suggest (tf, GST_TYPE_FIND_MINIMUM, caps);
-      gst_caps_free (caps);
-    }
-    g_strfreev (mlist);
-  }
-
-  GST_DEBUG ("closing pixbuf loader, hope it doesn't hang ...");
-  /* librsvg 2.4.x has a bug where it triggers an endless loop in trying
-     to close a gzip that's not an svg; fixed upstream but no good way
-     to work around it */
-  gdk_pixbuf_loader_close (pixbuf_loader, NULL);
-  GST_DEBUG ("closed pixbuf loader");
-  g_object_unref (G_OBJECT (pixbuf_loader));
-}
-#endif
-
 static gboolean
 plugin_init (GstPlugin * plugin)
 {
-  if (!gst_element_register (plugin, "gdkpixbufdec", GST_RANK_SECONDARY,
-          GST_TYPE_GDK_PIXBUF_DEC))
-    return FALSE;
+  gboolean ret = FALSE;
 
-#if 0
-  gst_type_find_register (plugin, "image/*", GST_RANK_MARGINAL,
-      gst_gdk_pixbuf_type_find, NULL, GST_CAPS_ANY, NULL);
-#endif
+  ret |= GST_ELEMENT_REGISTER (gdkpixbufdec, plugin);
+  ret |= GST_ELEMENT_REGISTER (gdkpixbufoverlay, plugin);
+  ret |= GST_ELEMENT_REGISTER (gdkpixbufsink, plugin);
 
-  if (!gst_element_register (plugin, "gdkpixbufoverlay", GST_RANK_NONE,
-          GST_TYPE_GDK_PIXBUF_OVERLAY))
-    return FALSE;
-
-  if (!gst_element_register (plugin, "gdkpixbufsink", GST_RANK_NONE,
-          GST_TYPE_GDK_PIXBUF_SINK))
-    return FALSE;
-
-  return TRUE;
+  return ret;
 }
 
 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,

ext/gdk_pixbuf/gstgdkpixbufsink.c

@@ -84,6 +84,7 @@
 #include "config.h"
 #endif
 
+#include "gstgdkpixbufelements.h"
 #include "gstgdkpixbufsink.h"
 
 #include <gst/video/video.h>
@@ -101,6 +102,8 @@ enum
 
 
 G_DEFINE_TYPE (GstGdkPixbufSink, gst_gdk_pixbuf_sink, GST_TYPE_VIDEO_SINK);
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (gdkpixbufsink, "gdkpixbufsink",
+    GST_RANK_NONE, GST_TYPE_GDK_PIXBUF_SINK, gdk_pixbuf_element_init (plugin));
 
 static void gst_gdk_pixbuf_sink_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);

ext/gdk_pixbuf/meson.build

@@ -1,6 +1,7 @@
 pixbuf_sources = [
   'gstgdkpixbufdec.c',
   'gstgdkpixbufoverlay.c',
+  'gstgdkpixbufelement.c',
   'gstgdkpixbufplugin.c',
   'gstgdkpixbufsink.c',
 ]