hide 0 index

src/UI/Canvas/color_index.gd

@@ -23,19 +23,26 @@ func _draw() -> void:
 	if zoom_percentage < Global.pixel_grid_show_at_zoom:
 		return
 	var project = ExtensionsApi.project.current_project
-	var size: Vector2i = project.size
 	var cel: BaseCel = project.frames[project.current_frame].cels[project.current_layer]
 	if not cel is PixelCel:
 		return
 	var index_image: Image = cel.image.indices_image
-	if index_image.get_size() != size or not cel.image.is_indexed:
+	if index_image.get_size() != project.size or not cel.image.is_indexed:
 		return
 
+	var used_rect: Rect2i = cel.image.get_used_rect()
+	if used_rect.size != Vector2i.ZERO:
+		# use smaller image for optimization
+		index_image = index_image.get_region(used_rect)
+
 	var font: Font = ExtensionsApi.theme.get_theme().default_font
-	draw_set_transform(position, rotation, Vector2(0.05, 0.05))
-	for x in range(size.x):
-		for y in range(size.y):
+	var offset = position + Vector2(used_rect.position)
+	draw_set_transform(offset, rotation, Vector2(0.05, 0.05))
+	for x in range(index_image.get_size().x):
+		for y in range(index_image.get_size().y):
 			var index := index_image.get_pixel(x, y).r8
+			if index == 0:
+				continue
 			draw_string(
 				font,
 				Vector2(x, y) * 20 + Vector2.DOWN * 16,