From 37e18b784e17e5b0dbbc0f0c4481e0e042f5d483 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Thu, 21 Mar 2024 07:15:44 -0400
Subject: [PATCH] gtk-demo: Add a callback cursor

Make one of the GTK logo cursors in the cursors demo use a callback
cursor that follows the cursor theme size, to show that that is
possible.
---
 demos/gtk-demo/cursors.c          |  46 ++++++++++
 demos/gtk-demo/cursors.ui         |  11 +--
 demos/gtk-demo/demo.gresource.xml |   1 +
 demos/gtk-demo/gtk-logo.svg       | 138 ++++++++++++++++++++++++++++++
 4 files changed, 188 insertions(+), 8 deletions(-)
 create mode 100644 demos/gtk-demo/gtk-logo.svg

diff --git a/demos/gtk-demo/cursors.c b/demos/gtk-demo/cursors.c
index 209dfd9b58..572dfb9a15 100644
--- a/demos/gtk-demo/cursors.c
+++ b/demos/gtk-demo/cursors.c
@@ -15,12 +15,54 @@ on_destroy (gpointer data)
   window = NULL;
 }
 
+static GdkTexture *
+cursor_callback (GdkCursor *cursor,
+                 int        cursor_size,
+                 double     scale,
+                 int       *width,
+                 int       *height,
+                 int       *hotspot_x,
+                 int       *hotspot_y,
+                 gpointer   data)
+{
+  GdkPixbuf *pixbuf;
+  GdkTexture *texture;
+  GError *error = NULL;
+  int scaled_size;
+
+  scaled_size = ceil (cursor_size * scale);
+
+  pixbuf = gdk_pixbuf_new_from_resource_at_scale ("/cursors/images/gtk-logo.svg",
+                                                  scaled_size, scaled_size,
+                                                  TRUE,
+                                                  &error);
+  if (!pixbuf)
+    {
+      g_print ("%s\n", error->message);
+      g_error_free (error);
+      return NULL;
+    }
+
+  texture = gdk_texture_new_for_pixbuf (pixbuf);
+
+  g_object_unref (pixbuf);
+
+  *width = cursor_size;
+  *height = cursor_size;
+  *hotspot_x = 18 * cursor_size / 32.0;
+  *hotspot_y = 2 * cursor_size / 32.0;
+
+  return texture;
+}
+
 GtkWidget *
 do_cursors (GtkWidget *do_widget)
 {
   if (!window)
     {
       GtkBuilder *builder;
+      GtkWidget *logo_callback;
+      GdkCursor *cursor;
 
       builder = gtk_builder_new_from_resource ("/cursors/cursors.ui");
       window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
@@ -29,6 +71,10 @@ do_cursors (GtkWidget *do_widget)
                               gtk_widget_get_display (do_widget));
       g_signal_connect (window, "destroy",
                         G_CALLBACK (on_destroy), NULL);
+      logo_callback = GTK_WIDGET (gtk_builder_get_object (builder, "logo_callback"));
+      cursor = gdk_cursor_new_from_callback (cursor_callback, NULL, NULL, NULL);
+      gtk_widget_set_cursor (logo_callback, cursor);
+      g_object_unref (cursor);
       g_object_unref (builder);
     }
 
diff --git a/demos/gtk-demo/cursors.ui b/demos/gtk-demo/cursors.ui
index 45e75724a3..dbcf2ad2dc 100644
--- a/demos/gtk-demo/cursors.ui
+++ b/demos/gtk-demo/cursors.ui
@@ -40,10 +40,6 @@
     <property name="hotspot-x">18</property>
     <property name="hotspot-y">2</property>
   </object>
-  <object class="GdkCursor" id="gtk-logo_cursor_fallback">
-    <property name="name">gtk-logo</property>
-    <property name="fallback">gtk-logo_cursor_image</property>
-  </object>
   <object class="GdkCursor" id="gtk-logo_cursor_image_fallback">
     <property name="texture">resource:///cursors/images/gtk_logo_cursor.png</property>
     <property name="hotspot-x">18</property>
@@ -827,15 +823,14 @@
                                 <property name="width-request">32</property>
                                 <property name="height-request">32</property>
                                 <property name="cursor">gtk-logo_cursor_image</property>
-                                <property name="tooltip-text" translatable="yes">An image cursor</property>
+                                <property name="tooltip-text" translatable="yes">An image cursor for the GTK logo</property>
                               </object>
                             </child>
                             <child>
-                              <object class="GtkFrame">
+                              <object class="GtkFrame" id="logo_callback">
                                 <property name="width-request">32</property>
                                 <property name="height-request">32</property>
-                                <property name="cursor">gtk-logo_cursor_fallback</property>
-                                <property name="tooltip-text" translatable="yes">The &quot;gtk-logo&quot; named cursor falling back to an image cursor</property>
+                                <property name="tooltip-text" translatable="yes">A callback cursor for the GTK logo</property>
                               </object>
                             </child>
                             <child>
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 306ca976c9..2998560b02 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -116,6 +116,7 @@
     <file>w_resize_cursor.png</file>
     <file>zoom_in_cursor.png</file>
     <file>zoom_out_cursor.png</file>
+    <file>gtk-logo.svg</file>
   </gresource>
   <gresource prefix="/dnd">
     <file>dnd.css</file>
diff --git a/demos/gtk-demo/gtk-logo.svg b/demos/gtk-demo/gtk-logo.svg
new file mode 100644
index 0000000000..9edbe2da97
--- /dev/null
+++ b/demos/gtk-demo/gtk-logo.svg
@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="128"
+   height="128"
+   id="svg6843"
+   sodipodi:version="0.32"
+   inkscape:version="0.92.4 5da689c313, 2019-01-14"
+   version="1.0"
+   sodipodi:docname="gtk-logo.svg"
+   inkscape:output_extension="org.inkscape.output.svg.inkscape"
+   inkscape:export-filename="/home/ebassi/Pictures/gtk-logo-256.png"
+   inkscape:export-xdpi="192"
+   inkscape:export-ydpi="192">
+  <defs
+     id="defs6845">
+    <inkscape:perspective
+       sodipodi:type="inkscape:persp3d"
+       inkscape:vp_x="-50 : 600 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_z="700 : 600 : 1"
+       inkscape:persp3d-origin="300 : 400 : 1"
+       id="perspective13" />
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="2.8284271"
+     inkscape:cx="69.874353"
+     inkscape:cy="64.313526"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:document-units="px"
+     inkscape:grid-bbox="true"
+     width="128px"
+     height="128px"
+     showguides="true"
+     inkscape:guide-bbox="true"
+     inkscape:window-width="1920"
+     inkscape:window-height="1016"
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+        <dc:title />
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+        <dc:creator>
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+        <dc:identifier />
+        <dc:source />
+        <dc:relation />
+        <dc:language />
+        <dc:subject>
+          <rdf:Bag />
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+        <dc:coverage />
+        <dc:description />
+        <dc:contributor>
+          <cc:Agent>
+            <dc:title />
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+        </dc:contributor>
+        <cc:license
+           rdf:resource="" />
+      </cc:Work>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
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+    </rdf:RDF>
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+     id="layer1"
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer">
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