Game is really slow on Mac OS and crashes a lot

[Gennady Trafimenkov]

Game is really slow on Mac OS X (tested on 10.8.2) and also it crashes a lot.

[Gennady Trafimenkov]

Slow game should be fixed by now (see #21). Need to repeat crashes and fix them.

[Gennady Trafimenkov]

Example of the crash:

Exception Type:  EXC_CRASH (SIGSEGV)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Thread 0:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib          0x9972e3ba __kill + 10
1   libsystem_kernel.dylib          0x9972d4bc kill$UNIX2003 + 32
2   libsystem_c.dylib               0x93ff7713 raise + 26
3   libsystem_c.dylib               0x93f9086b _sigtramp + 43
4   ???                             0xffffffff 0 + 4294967295
5   ja2                             0x0034e650 SDL_UninstallParachute + 112
6   ja2                             0x003448d1 Blt16BPPTo16BPP(unsigned short*, unsigned int, unsigned short*, unsigned int, int, int, int, int, unsigned int, unsigned int) + 177
7   ja2                             0x002e1471 RestoreShiftedVideoOverlays(short, short) + 929
8   ja2                             0x0034845f ScrollJA2Background(short, short) + 1071
9   ja2                             0x00348ea1 RefreshScreen() + 593
10  ja2                             0x0004c853 GameLoop() + 1155
11  ja2                             0x003326c1 MainLoop() + 273
12  ja2                             0x003327ff SDL_main + 191
13  ja2                             0x0034dc4c -[SDLMain applicationDidFinishLaunching:] + 76
14  com.apple.Foundation            0x94129c52 __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_0 + 

[Gennady Trafimenkov]

v0.12.138 seems to work fine