Merge pull request #13290 from VOREStation/upstream-merge-8660

[MIRROR] Adds some core behavior code, uses it to fix a small bug (ABLE TO BE MERGED)

code/core/image/Transform.dm

@@ -0,0 +1,53 @@
+/// The image's base transform scale for width.
+/image/var/tf_scale_x
+
+/// The image's base transform scale for height.
+/image/var/tf_scale_y
+
+/// The image's base transform scale for rotation.
+/image/var/tf_rotation
+
+/// The image's base transform scale for horizontal offset.
+/image/var/tf_offset_x
+
+/// The image's base transform scale for vertical offset.
+/image/var/tf_offset_y
+
+
+/// Clear the image's tf_* variables and the current transform state.
+/image/proc/ClearTransform()
+	tf_scale_x = null
+	tf_scale_y = null
+	tf_rotation = null
+	tf_offset_x = null
+	tf_offset_y = null
+	transform = null
+
+
+/// Sets the image's tf_* variables and the current transform state, also applying others if supplied.
+/image/proc/SetTransform(
+	scale,
+	scale_x = tf_scale_x,
+	scale_y = tf_scale_y,
+	rotation = tf_rotation,
+	offset_x = tf_offset_x,
+	offset_y = tf_offset_y,
+	list/others
+)
+	if (!isnull(scale))
+		tf_scale_x = scale
+		tf_scale_y = scale
+	else
+		tf_scale_x = scale_x
+		tf_scale_y = scale_y
+	tf_rotation = rotation
+	tf_offset_x = offset_x
+	tf_offset_y = offset_y
+	transform = matrix().Update(
+		scale_x = tf_scale_x,
+		scale_y = tf_scale_y,
+		rotation = tf_rotation,
+		offset_x = tf_offset_x,
+		offset_y = tf_offset_y,
+		others = others
+	)