tcod.image_from_console segfaults

Ape commented 5 years ago

I tried to use tcod.image_from_console to take screenshots, but it just segfaults. I am using python-tcod 10.0.5 on Arch Linux and the SDL2 renderer.

Thread 1 "python" received signal SIGSEGV, Segmentation fault.
#0  0x00007ffff70d6180 in _Z26TCOD_sys_console_to_bitmapP11SDL_SurfaceP12TCOD_ConsoleS2_ (
    vbitmap=0x555556e82ae0, console=0x5555565837d0, cache=0x0)
    at libtcod/src/libtcod/sys_sdl_c.cpp:567
#1  0x00007ffff70e5c54 in TCOD_image_from_console (console=0x0)
    at libtcod/src/libtcod/image_c.cpp:445
#2  0x00007ffff7136d8f in _cffi_f_TCOD_image_from_console (self=<optimized out>, 
    arg0=0x7ffff72e08f0) at build/temp.linux-x86_64-3.7/tcod._libtcod.c:38699
#3  0x00007ffff7b83db8 in _PyMethodDef_RawFastCallKeywords ()
   from /usr/lib/libpython3.7m.so.1.0
#4  0x00007ffff7b84101 in _PyCFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#5  0x00007ffff7bf4d19 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#6  0x00007ffff7b3ddbb in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#7  0x00007ffff7bf183e in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#8  0x00007ffff7b3cd09 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#9  0x00007ffff7b83882 in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#10 0x00007ffff7bf46ea in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#11 0x00007ffff7b836db in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#12 0x00007ffff7bf022d in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#13 0x00007ffff7b3cd09 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#14 0x00007ffff7b3dc64 in PyEval_EvalCodeEx () from /usr/lib/libpython3.7m.so.1.0
#15 0x00007ffff7b3dc8c in PyEval_EvalCode () from /usr/lib/libpython3.7m.so.1.0
#16 0x00007ffff7c06a0d in ?? () from /usr/lib/libpython3.7m.so.1.0
#17 0x00007ffff7b83ef3 in _PyMethodDef_RawFastCallKeywords ()
   from /usr/lib/libpython3.7m.so.1.0
#18 0x00007ffff7b84101 in _PyCFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#19 0x00007ffff7bf4552 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#20 0x00007ffff7b3cd09 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#21 0x00007ffff7b83882 in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#22 0x00007ffff7bf022d in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#23 0x00007ffff7b3cd09 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#24 0x00007ffff7b3df8c in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#25 0x00007ffff7c6bdd7 in ?? () from /usr/lib/libpython3.7m.so.1.0
#26 0x00007ffff7c6d172 in ?? () from /usr/lib/libpython3.7m.so.1.0
#27 0x00007ffff7c6d4ec in _Py_UnixMain () from /usr/lib/libpython3.7m.so.1.0
#28 0x00007ffff7dcace3 in __libc_start_main () from /usr/lib/libc.so.6
#29 0x000055555555505e in _start ()

(gdb) info locals
charmap_backup = 0x0
bitmap = 0x555556e82ae0
sdl_back = 0
sdl_fore = 0
fading_color = {r = 0 '\000', g = 0 '\000', b = 0 '\000'}
fade = 255
track_changes = false
bpp = <optimized out>
hdelta = <optimized out>

(gdb) info args
vbitmap = 0x555556e82ae0
console = 0x5555565837d0
cache = 0x0

Ape commented 5 years ago

I guess the interesting bit in that backtrace is:

1 in TCOD_image_from_console (console=0x0)

Also the global SDL_Surface* charmap in sys_sdl_c.cpp is null when the crash happens.

HexDecimal commented 5 years ago

This is one of the functions not converted to the newer rendering yet. The old renderer doesn't support loading TrueType fonts so it won't have a tileset when invoked.

I'll need to write a new software renderer to fix this.

Ape commented 5 years ago

Good to know. This is not super important function for me, but it could be handy at times.

libtcod / python-tcod

tcod.image_from_console segfaults #77