Crash at function Blit_3or4_to_3or4__same_rgb

[arnzel]

Hi i tried ton run some old dos game The Clou (https://github.com/vcosta/derclou) with jnr-ffi. This game use SDL libary for graphics and other functions (https://www.libsdl.org/) . I try to run this game with Java and the jnr-ffi library (https://github.com/jnr/jnr-ffi Java Abstracted Foreign Function Layer). But it seems to crash when invoking the function "Blit_3or4_to_3or4__same_rgb".

Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [libSDL2-2.0.0.dylib+0x86367] Blit_3or4_to_3or4__same_rgb+0x1ff
C [libSDL2-2.0.0.dylib+0x6c4ac] SDL_SoftBlit+0x135
C [libSDL2-2.0.0.dylib+0xa0725] SDL_ConvertPixels_REAL+0x2b4
C [base.so+0x12651] gfxSetRGB+0x91
C [base.so+0x12012] gfxInit+0x6f2
C [base.so+0x8266] main+0x336

Exception Type: EXC_BAD_ACCESS (SIGABRT)
Exception Codes: KERN_PROTECTION_FAILURE at 0x000000010927d128
Exception Codes: 0x0000000000000002, 0x000000010927d128

Maybe you can help me to understand where the problem can be. I have completely no idea if this is a problem of the JVM,jnr-ffi or the sdl library.

See also jnr/jnr-ffi#344

[slouken]

SDL should never crash internally with valid input. What version of SDL are you using? Are you able to build a debug version of the latest release and try it with that?

[1bsyl]

you can force to use the slow_blit_function by modifying SDL
https://github.com/libsdl-org/SDL/blob/main/src/video/SDL_blit.c#L280
(#define TEST_SLOW_BLIT 1)
and see if this still crashes ...

[slouken]

No response, I'll go ahead and close this for now. Please let us know if it's still an issue.