tests: Add testtexture

a test that simply loads a given file as a texture and renders it.

tests/meson.build

@@ -128,7 +128,8 @@ gtk_tests = [
   ['showrendernode'],
   ['testborderdrawing'],
   ['testoutsetshadowdrawing'],
-  ['testblur']
+  ['testblur'],
+  ['testtexture'],
 ]
 
 if os_linux

tests/testtexture.c

@@ -0,0 +1,144 @@
+#include <gtk/gtk.h>
+
+
+
+typedef struct _GtkTextureView      GtkTextureView;
+typedef struct _GtkTextureViewClass GtkTextureViewClass;
+
+#define GTK_TYPE_TEXTURE_VIEW           (gtk_texture_view_get_type ())
+#define GTK_TEXTURE_VIEW(obj)           (G_TYPE_CHECK_INSTANCE_CAST(obj, GTK_TYPE_TEXTURE_VIEW, GtkTextureView))
+#define GTK_TEXTURE_VIEW_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST(cls, GTK_TYPE_TEXTURE_VIEW, GtkTextureViewClass))
+struct _GtkTextureView
+{
+  GtkWidget parent_instance;
+
+  GdkTexture *texture;
+};
+
+struct _GtkTextureViewClass
+{
+  GtkWidgetClass parent_class;
+};
+
+GType gtk_texture_view_get_type (void) G_GNUC_CONST;
+
+
+G_DEFINE_TYPE(GtkTextureView, gtk_texture_view, GTK_TYPE_WIDGET)
+
+static void
+gtk_texture_view_measure (GtkWidget      *widget,
+                          GtkOrientation  orientation,
+                          int             for_size,
+                          int            *minimum,
+                          int            *natural,
+                          int            *minimum_baseline,
+                          int            *natural_baseline)
+{
+  GtkTextureView *self = GTK_TEXTURE_VIEW (widget);
+
+  if (self->texture == NULL)
+    return;
+
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      *minimum = 0;
+      *natural = gdk_texture_get_width (self->texture);
+    }
+  else /* VERTICAL */
+    {
+      *minimum = 0;
+      *natural = gdk_texture_get_height (self->texture);
+    }
+}
+
+static void
+gtk_texture_view_snapshot (GtkWidget   *widget,
+                           GtkSnapshot *snapshot)
+{
+  GtkTextureView *self = GTK_TEXTURE_VIEW (widget);
+  int width = gtk_widget_get_width (widget);
+  int height = gtk_widget_get_height (widget);
+
+  if (self->texture != NULL)
+    {
+      graphene_rect_t bounds;
+
+      bounds.origin.x = MAX (0, width / 2 - gdk_texture_get_width (self->texture));
+      bounds.origin.y = MAX (0, height / 2 - gdk_texture_get_height (self->texture));
+
+      bounds.size.width = MIN (width, gdk_texture_get_width (self->texture));
+      bounds.size.height = MIN (height, gdk_texture_get_height (self->texture));
+
+      gtk_snapshot_append_texture (snapshot, self->texture, &bounds, "Texture");
+    }
+}
+
+static void
+gtk_texture_view_finalize (GObject *object)
+{
+  GtkTextureView *self = GTK_TEXTURE_VIEW (object);
+
+  g_clear_object (&self->texture);
+
+  G_OBJECT_CLASS (gtk_texture_view_parent_class)->finalize (object);
+}
+
+static void
+gtk_texture_view_init (GtkTextureView *self)
+{
+  gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
+}
+
+static void
+gtk_texture_view_class_init (GtkTextureViewClass *klass)
+{
+  GObjectClass   *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  object_class->finalize = gtk_texture_view_finalize;
+
+  widget_class->measure = gtk_texture_view_measure;
+  widget_class->snapshot = gtk_texture_view_snapshot;
+}
+
+int
+main (int argc, char **argv)
+{
+  GtkWidget *window;
+  GtkWidget *view;
+  GdkTexture *texture;
+  GFile *file;
+  GError *error = NULL;
+
+  gtk_init ();
+
+  if (argc != 2)
+    {
+      g_error ("No texture file path given.");
+      return -1;
+    }
+
+  file = g_file_new_for_path (argv[1]);
+  texture = gdk_texture_new_from_file (file, &error);
+
+  if (error != NULL)
+    {
+      g_error ("Error: %s", error->message);
+      return -1;
+    }
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+  view = g_object_new (GTK_TYPE_TEXTURE_VIEW, NULL);
+  ((GtkTextureView*)view)->texture = g_steal_pointer (&texture);
+
+  gtk_container_add (GTK_CONTAINER (window), view);
+
+  gtk_widget_show (window);
+  gtk_main ();
+
+
+  g_object_unref (file);
+
+  return 0;
+}