libsysprof-gtk: start on GTK widgetry library

This is ultimately to replace libsysprof-ui, and will focus on the display
of capture files. Recording will be left to the sysprof application in
terms of UI, and other applications like IDEs will use the
libsysprof-profile API directly along with libsysprof-gtk for visualizing.

src/libsysprof-gtk/sysprof-weighted-callgraph-view.c

@@ -0,0 +1,85 @@
+/* sysprof-weighted-callgraph-view.c
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include "sysprof-callgraph-view-private.h"
+#include "sysprof-weighted-callgraph-view.h"
+
+struct _SysprofWeightedCallgraphView
+{
+  SysprofCallgraphView parent_instance;
+};
+
+struct _SysprofWeightedCallgraphViewClass
+{
+  SysprofCallgraphViewClass parent_class;
+};
+
+typedef struct _AugmentWeight
+{
+  guint size;
+  guint total;
+} AugmentWeight;
+
+G_DEFINE_FINAL_TYPE (SysprofWeightedCallgraphView, sysprof_weighted_callgraph_view, SYSPROF_TYPE_CALLGRAPH_VIEW)
+
+static void
+augment_weight (SysprofCallgraph     *callgraph,
+                SysprofCallgraphNode *node,
+                SysprofDocumentFrame *frame,
+                gpointer              user_data)
+{
+  AugmentWeight *aug;
+
+  g_assert (SYSPROF_IS_CALLGRAPH (callgraph));
+  g_assert (node != NULL);
+  g_assert (SYSPROF_IS_DOCUMENT_SAMPLE (frame));
+  g_assert (user_data == NULL);
+
+  aug = sysprof_callgraph_get_augment (callgraph, node);
+  aug->size += 1;
+
+  for (; node; node = sysprof_callgraph_node_parent (node))
+    {
+      aug = sysprof_callgraph_get_augment (callgraph, node);
+      aug->total += 1;
+    }
+}
+
+static void
+sysprof_weighted_callgraph_view_class_init (SysprofWeightedCallgraphViewClass *klass)
+{
+  SysprofCallgraphViewClass *callgraph_view_class = SYSPROF_CALLGRAPH_VIEW_CLASS (klass);
+
+  callgraph_view_class->augment_size = sizeof (AugmentWeight);
+  callgraph_view_class->augment_func = augment_weight;
+}
+
+static void
+sysprof_weighted_callgraph_view_init (SysprofWeightedCallgraphView *self)
+{
+}
+
+GtkWidget *
+sysprof_weighted_callgraph_view_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_WEIGHTED_CALLGRAPH_VIEW, NULL);
+}