(svn r10042) -Codechange: Replace hardcoded spritecache size with a configuration

option, sprite_cache_size. The default size is 2MB and the value can 
range from 1 to 64MB. If you experience slow-downs when scrolling the 
map, try increasing this setting.

src/settings.cpp

@@ -46,6 +46,7 @@
 #include "gfx.h"
 #include "fontcache.h"
 #endif
+#include "spritecache.h"
 
 /** The patch values that are used for new games and/or modified in config file */
 Patches _patches_newgame;
@@ -1257,6 +1258,7 @@ static const SettingDescGlobVarList _misc_settings[] = {
 	  SDTG_VAR("medium_size",      SLE_UINT, S, 0, _freetype.medium_size, 10, 0, 72, 0, STR_NULL, NULL),
 	  SDTG_VAR("large_size",       SLE_UINT, S, 0, _freetype.large_size,  16, 0, 72, 0, STR_NULL, NULL),
 #endif
+	  SDTG_VAR("sprite_cache_size",SLE_UINT, S, 0, _sprite_cache_size,     2, 1, 64, 0, STR_NULL, NULL),
 	  SDTG_END()
 };
 

src/spritecache.cpp

@@ -12,9 +12,9 @@
 #include "fileio.h"
 #include "helpers.hpp"
 
-#ifndef SPRITE_CACHE_SIZE
-# define SPRITE_CACHE_SIZE 2*1024*1024
-#endif /* SPRITE_CACHE_SIZE */
+
+/* Default of 2MB spritecache */
+uint _sprite_cache_size = 2;
 
 
 struct SpriteCache {
@@ -409,10 +409,10 @@ const void *GetRawSprite(SpriteID sprite)
 void GfxInitSpriteMem()
 {
 	/* initialize sprite cache heap */
-	if (_spritecache_ptr == NULL) _spritecache_ptr = (MemBlock*)malloc(SPRITE_CACHE_SIZE);
+	if (_spritecache_ptr == NULL) _spritecache_ptr = (MemBlock*)malloc(_sprite_cache_size * 1024 * 1024);
 
 	/* A big free block */
-	_spritecache_ptr->size = (SPRITE_CACHE_SIZE - sizeof(MemBlock)) | S_FREE_MASK;
+	_spritecache_ptr->size = ((_sprite_cache_size * 1024 * 1024) - sizeof(MemBlock)) | S_FREE_MASK;
 	/* Sentinel block (identified by size == 0) */
 	NextBlock(_spritecache_ptr)->size = 0;
 

src/spritecache.h

@@ -14,6 +14,8 @@ struct Sprite {
 	byte data[VARARRAY_SIZE];
 };
 
+extern uint _sprite_cache_size;
+
 const void *GetRawSprite(SpriteID sprite);
 bool SpriteExists(SpriteID sprite);