From 4e839aacf650f65cd8aeeece91fa038b3c68ffdb Mon Sep 17 00:00:00 2001
From: maedhros <maedhros@openttd.org>
Date: Sun, 10 Feb 2008 14:49:44 +0000
Subject: (svn r12102) -Feature: Allow locking individual transparency settings
 so they will not be changed by pressing 'x'. (Roujin)

---
 src/transparency.h | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

(limited to 'src/transparency.h')

diff --git a/src/transparency.h b/src/transparency.h
index 344946769..8f4dbbeeb 100644
--- a/src/transparency.h
+++ b/src/transparency.h
@@ -28,6 +28,7 @@ enum TransparencyOption {
 
 typedef byte TransparencyOptionBits; ///< transparency option bits
 extern TransparencyOptionBits _transparency_opt;
+extern TransparencyOptionBits _transparency_lock;
 
 /**
  * Check if the transparency option bit is set
@@ -43,26 +44,33 @@ static inline bool IsTransparencySet(TransparencyOption to)
 /**
  * Toggle the transparency option bit
  *
- * @param to the structure which transparency option is toggle
+ * @param to the transparency option to be toggled
  */
 static inline void ToggleTransparency(TransparencyOption to)
 {
 	ToggleBit(_transparency_opt, to);
 }
 
-/** Toggle all transparency options (except signs) or restore the stored transparencies */
-static inline void ResetRestoreAllTransparency()
+/**
+ * Toggle the transparency lock bit
+ *
+ * @param to the transparency option to be locked or unlocked
+ */
+static inline void ToggleTransparencyLock(TransparencyOption to)
 {
-	/* backup of the original transparencies or if all transparencies false toggle them to true */
-	static TransparencyOptionBits trans_opt = ~0;
+	ToggleBit(_transparency_lock, to);
+}
 
-	if (_transparency_opt == 0) {
-		/* no structure is transparent, so restore the old transparency if present otherwise set all true */
-		_transparency_opt = trans_opt;
+/** Set or clear all non-locked transparency options */
+static inline void ResetRestoreAllTransparency()
+{
+	/* if none of the non-locked options are set */
+	if ((_transparency_opt & ~_transparency_lock) == 0) {
+		/* set all non-locked options */
+		_transparency_opt |= ~_transparency_lock;
 	} else {
-		/* any structure is transparent, so store current transparency settings and reset it */
-		trans_opt = _transparency_opt;
-		_transparency_opt = 0;
+		/* clear all non-locked options */
+		_transparency_opt &= _transparency_lock;
 	}
 
 	MarkWholeScreenDirty();
-- 
cgit v1.2.3-54-g00ecf