From 3919198e4d58c79e63d77fad6758cd140b925c5c Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Wed, 22 Nov 2006 14:14:02 +0000
Subject: (svn r7237) -Fix: TGP landscape generation could leak memory if
 aborted during the generation of the heightmap.

---
 genworld.c | 13 +++++++++++++
 genworld.h |  3 +++
 tgp.c      |  3 +++
 3 files changed, 19 insertions(+)

diff --git a/genworld.c b/genworld.c
index 55f7bb590..2e1f003d5 100644
--- a/genworld.c
+++ b/genworld.c
@@ -164,6 +164,15 @@ void GenerateWorldSetCallback(gw_done_proc *proc)
 	_gw.proc = proc;
 }
 
+/**
+ * Set here the function, if any, that you want to be called when landscape
+ *  generation is aborted.
+ */
+void GenerateWorldSetAbortCallback(gw_abort_proc *proc)
+{
+	_gw.abortp = proc;
+}
+
 /**
  * This will wait for the thread to finish up his work. It will not continue
  *  till the work is done.
@@ -201,12 +210,15 @@ void HandleGeneratingWorldAbortion(void)
 	/* Clean up - in SE create an empty map, otherwise, go to intro menu */
 	_switch_mode = (_game_mode == GM_EDITOR) ? SM_EDITOR : SM_MENU;
 
+	if (_gw.abortp != NULL) _gw.abortp();
+
 	if (_cursor.sprite == SPR_CURSOR_ZZZ) SetMouseCursor(SPR_CURSOR_MOUSE);
 	/* Show all vital windows again, because we have hidden them */
 	if (_gw.threaded && _game_mode != GM_MENU) ShowVitalWindows();
 	_gw.active   = false;
 	_gw.thread   = NULL;
 	_gw.proc     = NULL;
+	_gw.abortp   = NULL;
 	_gw.threaded = false;
 
 	DeleteWindowById(WC_GENERATE_PROGRESS_WINDOW, 0);
@@ -229,6 +241,7 @@ void GenerateWorld(int mode, uint size_x, uint size_y)
 	_gw.size_y = size_y;
 	_gw.active = true;
 	_gw.abort  = false;
+	_gw.abortp = NULL;
 	_gw.lp     = _local_player;
 	_gw.wait_for_draw = false;
 	_gw.quit_thread   = false;
diff --git a/genworld.h b/genworld.h
index bb882b1c1..0cf67cbe6 100644
--- a/genworld.h
+++ b/genworld.h
@@ -25,6 +25,7 @@ enum {
 };
 
 typedef void gw_done_proc(void);
+typedef void gw_abort_proc(void);
 
 typedef struct gw_info {
 	bool active;           //! Is generating world active
@@ -37,6 +38,7 @@ typedef struct gw_info {
 	uint size_x;           //! X-size of the map
 	uint size_y;           //! Y-size of the map
 	gw_done_proc *proc;    //! Proc that is called when done (can be NULL)
+	gw_abort_proc *abortp; //! Proc that is called when aborting (can be NULL)
 	OTTDThread *thread;    //! The thread we are in (can be NULL)
 } gw_info;
 
@@ -74,6 +76,7 @@ void SetGeneratingWorldPaintStatus(bool status);
 bool IsGeneratingWorldReadyForPaint(void);
 bool IsGenerateWorldThreaded(void);
 void GenerateWorldSetCallback(gw_done_proc *proc);
+void GenerateWorldSetAbortCallback(gw_abort_proc *proc);
 void WaitTillGeneratedWorld(void);
 void GenerateWorld(int mode, uint size_x, uint size_y);
 void AbortGeneratingWorld(void);
diff --git a/tgp.c b/tgp.c
index 8c99856f6..d7f9722f9 100644
--- a/tgp.c
+++ b/tgp.c
@@ -798,6 +798,8 @@ void GenerateTerrainPerlin(void)
 	uint x, y;
 
 	if (!AllocHeightMap()) return;
+	GenerateWorldSetAbortCallback(FreeHeightMap);
+
 	HeightMapGenerate();
 
 	IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
@@ -823,4 +825,5 @@ void GenerateTerrainPerlin(void)
 	for (x = 0; x < _height_map.size_x;     x++) MakeVoid(_height_map.size_x * y + x);
 
 	FreeHeightMap();
+	GenerateWorldSetAbortCallback(NULL);
 }
-- 
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