Fix loading defaults from image object def

Content.Tests/DMProject/Tests/Image/subclass.dm

@@ -0,0 +1,14 @@
+/image/subclass
+	plane = 123
+	icon_state = "subclass"
+
+/proc/RunTest()
+	var/image/test = new /image/subclass
+	ASSERT(test.plane == 123)
+	ASSERT(test.icon_state == "subclass")
+	var/image/subclass/test2 = new(icon())
+	ASSERT(test2.plane == FLOAT_PLANE)
+	ASSERT(test2.icon_state == null)
+	var/image/subclass/test3 = new(icon_state="test")
+	ASSERT(test3.plane == 123)
+	ASSERT(test3.icon_state == "test")

DMCompiler/DMStandard/Types/Image.dm

@@ -7,8 +7,11 @@
 	var/appearance_flags = 0
 	var/blend_mode = 0
 	var/color = null
+	var/list/contents as opendream_unimplemented
+	var/density = 0 as opendream_unimplemented
 	var/desc = null
 	var/gender = "neuter" as opendream_unimplemented
+	var/glide_size = 0 as opendream_unimplemented
 	var/infra_luminosity = 0 as opendream_unimplemented
 	var/invisibility as opendream_unimplemented
 	var/list/filters = list()
@@ -25,9 +28,10 @@
 	var/mouse_drop_zone = 0 as opendream_unimplemented
 	var/mouse_opacity = 1
 	var/name = "image"
-	var/opacity as opendream_unimplemented
+	var/opacity = 0 as opendream_unimplemented
 	var/list/overlays = null
 	var/override = 0
+	var/pixel_step_size = 0 as opendream_unimplemented
 	var/pixel_x = 0
 	var/pixel_y = 0
 	var/pixel_w = 0 as opendream_unimplemented
@@ -39,6 +43,8 @@
 	var/text = "i" as opendream_unimplemented
 	var/matrix/transform
 	var/list/underlays = null
+	var/list/verbs as opendream_unimplemented
+	var/visibility = 1 as opendream_unimplemented
 	var/vis_flags = 0 as opendream_unimplemented
 
 	var/bound_width as opendream_unimplemented

OpenDreamClient/Rendering/DreamPlane.cs

@@ -70,6 +70,8 @@ public void Draw(DreamViewOverlay overlay, DrawingHandleWorld handle, Box2 world
     /// Draws this plane's mouse map onto the current render target
     /// </summary>
     public void DrawMouseMap(DrawingHandleWorld handle, DreamViewOverlay overlay, Vector2i renderTargetSize, Box2 worldAABB) {
+        if (Master?.MouseOpacity == MouseOpacity.Transparent)
+            return;
         handle.UseShader(overlay.BlockColorInstance);
         foreach (var sprite in Sprites) {
             if (sprite.MouseOpacity == MouseOpacity.Transparent || sprite.ShouldPassMouse)

OpenDreamRuntime/Objects/Types/DreamObjectImage.cs

@@ -39,9 +39,9 @@ public override void Initialize(DreamProcArguments args) {
         base.Initialize(args);
 
         DreamValue icon = args.GetArgument(0);
-        if (!AtomManager.TryCreateAppearanceFrom(icon, out Appearance)) {
+        if (icon.IsNull || !AtomManager.TryCreateAppearanceFrom(icon, out Appearance)) {
             // Use a default appearance, but log a warning about it if icon wasn't null
-            Appearance = new IconAppearance();
+            Appearance = AtomManager.GetAppearanceFromDefinition(ObjectDefinition);
             if (!icon.IsNull)
                 Logger.GetSawmill("opendream.image")
                     .Warning($"Attempted to create an /image from {icon}. This is invalid and a default image was created instead.");