Fixing imagecache (etternagame#194)

Author: Jousway

src/ImageCache.cpp

@@ -1,8 +1,9 @@
-#include "global.h"
+#include "global.h"
 
 #include "ImageCache.h"
 #include "Foreach.h"
 #include "PrefsManager.h"
+#include "RageFileManager.h"
 #include "RageDisplay.h"
 #include "RageLog.h"
 #include "RageSurface.h"
@@ -14,6 +15,7 @@
 #include "RageTexture.h"
 #include "RageTextureManager.h"
 #include "RageUtil.h"
+#include "CommonMetrics.h"
 #include "SongCacheIndex.h"
 #include "SpecialFiles.h"
 #include "Sprite.h"
@@ -27,6 +29,8 @@ static Preference<bool> g_bPalettedImageCache( "PalettedImageCache", false );
 //const std::string IMAGE_CACHE_INDEX = SpecialFiles::CACHE_DIR + "images.cache";
 #define IMAGE_CACHE_INDEX (SpecialFiles::CACHE_DIR + "images.cache")
 
+#define IMAGE_CACHE_VERSION 1
+
 /* Call CacheImage to cache a image by path.  If the image is already
  * cached, it'll be recreated.  This is efficient if the image hasn't changed,
  * but we still only do this in TidyUpData for songs.
@@ -174,9 +178,36 @@ ImageCache::~ImageCache()
 	UnloadAllImages();
 }
 
+static void EmptyDir(RString dir)
+{
+	ASSERT(dir[dir.size() - 1] == '/');
+
+	vector<RString> asCacheFileNames;
+	GetDirListing(dir, asCacheFileNames);
+	for (unsigned i = 0; i<asCacheFileNames.size(); i++)
+	{
+		if (!IsADirectory(dir + asCacheFileNames[i]))
+			FILEMAN->Remove(dir + asCacheFileNames[i]);
+	}
+}
+
 void ImageCache::ReadFromDisk()
 {
 	ImageData.ReadFile( IMAGE_CACHE_INDEX );	// don't care if this fails
+	
+	int iCacheVersion = -1;
+	ImageData.GetValue("Cache", "CacheVersion", iCacheVersion);
+	if (iCacheVersion == IMAGE_CACHE_VERSION)
+		return;
+
+	LOG->Trace( "Cache format is out of date.  Deleting all cache files." );	
+	vector<RString> ImageDir;
+	split( CommonMetrics::IMAGES_TO_CACHE, ",", ImageDir );
+	for( std::string Image : ImageDir )
+		EmptyDir( SpecialFiles::CACHE_DIR+Image+"/" );
+	
+	ImageData.SetValue( "Cache", "CacheVersion", IMAGE_CACHE_VERSION);
+	ImageData.WriteFile( IMAGE_CACHE_INDEX );
 }
 
 struct ImageTexture: public RageTexture

src/SongCacheIndex.cpp

@@ -36,7 +36,7 @@
  * path; we don't have to actually look in the directory (to find out the directory hash)
  * in order to find the cache file.
  */
-const string CACHE_INDEX = SpecialFiles::CACHE_DIR + "index.cache";
+const string CACHE_INDEX = SpecialFiles::CACHE_DIR + "images.cache";
 const string CACHE_DB = SpecialFiles::CACHE_DIR + "cache.db";
 const unsigned int CACHE_DB_VERSION = 236;
 
@@ -714,33 +714,31 @@ static void EmptyDir(RString dir)
 
 void SongCacheIndex::ReadCacheIndex()
 {
-	CacheIndex.ReadFile(CACHE_INDEX);	// don't care if this fails
+	return;
+	/*CacheIndex.ReadFile(CACHE_INDEX);	// don't care if this fails
 
 	int iCacheVersion = -1;
 	CacheIndex.GetValue("Cache", "CacheVersion", iCacheVersion);
 	if (iCacheVersion == FILE_CACHE_VERSION)
 		return; // OK
 
 	LOG->Trace( "Cache format is out of date.  Deleting all cache files." );
+	EmptyDir(SpecialFiles::CACHE_DIR + "Banners/");
 	EmptyDir( SpecialFiles::CACHE_DIR+"Songs/" );
 	EmptyDir( SpecialFiles::CACHE_DIR+"Courses/" );
 	
-
-	// comment out until we stop being really bad at dealing with cache versions (revisit asap) - mina
-	/*
 	vector<RString> ImageDir;
 	split( CommonMetrics::IMAGES_TO_CACHE, ",", ImageDir );
 	for( std::string Image : ImageDir )
-		EmptyDir( SpecialFiles::CACHE_DIR+Image+"/" );
-	*/ 
+		EmptyDir( SpecialFiles::CACHE_DIR+Image+"/" );*/
 
-	CacheIndex.Clear();
+	//CacheIndex.Clear();
 	/* This is right now in place because our song file paths are apparently being
 	* cached in two distinct areas, and songs were loading from paths in FILEMAN.
 	* This is admittedly a hack for now, but this does bring up a good question on
 	* whether we really need a dedicated cache for future versions of StepMania.
 	*/
-	FILEMAN->FlushDirCache();
+	//FILEMAN->FlushDirCache();
 }
 
 void SongCacheIndex::SaveCacheIndex()