crash on drawing a miniature

[dougmencken]

When the room miniatures are on, the game crashes while drawing some rooms

(gdb) run --args --head-room=blacktooth5.xml

built room blacktooth4.xml
constructed Miniature( room "blacktooth4.xml", leftX=70, topY=-2, sizeOfTile=3 )
drawing two pixels at 95,40 and 94,40

Thread 13 "headoverheels" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffee0006c0 (LWP 8985)]
0x0000555555587471 in allegro::Pict::drawPixelAt(int, int, AllegroColor) const () at WrappersAllegro.cpp:330
330	void Pict::drawPixelAt( int x, int y, AllegroColor color ) const

(gdb) bt
#0  0x0000555555587471 in allegro::Pict::drawPixelAt(int, int, AllegroColor) const () at WrappersAllegro.cpp:330
#1  0x000055555560a64d in Miniature::drawIsoTile (this=this@entry=0x7fffedfffbc0, where=..., x0=x0@entry=112, y0=y0@entry=13, tileX=tileX@entry=3, tileY=tileY@entry=6, color=..., 
    loX=false, loY=true, hiX=false, hiY=false) at Miniature.cpp:751
#2  0x000055555560afcc in Miniature::drawIsoTile (this=0x7fffedfffbc0, where=..., x0=112, y0=13, tileX=3, tileY=6, color=..., loX=false, loY=true, hiX=false, hiY=false)
    at Miniature.cpp:727
#3  Miniature::drawWestDoorOnMiniature (this=0x7fffedfffbc0, where=..., x0=112, y0=13, tilesX=4, tilesY=6, color=...) at Miniature.cpp:609
#4  0x0000555555610ec7 in Miniature::drawWestDoorOnMiniature (this=0x7fffedfffbc0, where=..., x0=112, y0=13, tilesX=4, tilesY=6, color=...)
    at /home/dougmencken/boo/source/Color.hpp:33
#5  Miniature::draw (this=this@entry=0x7fffedfffbc0) at Miniature.cpp:134
#6  0x00005555556178c5 in Isomot::updateMe (this=this@entry=0x5555556dbe48 <GameManager::instance+264>) at Isomot.cpp:258
#7  0x00005555555fe74c in GameManager::update (this=0x5555556dbd40 <GameManager::instance>) at GameManager.cpp:174
#8  0x00005555555feb6c in GameManager::begin (this=<optimized out>) at GameManager.cpp:139
#9  0x00005555555fec45 in GameManager::beginOrResume (pointerToBoolean=<optimized out>) at /home/dougmencken/boo/source/GameManager.hpp:49
#10 0x00007ffff76a1e2e in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447

[dougmencken]

after 12bbd56 the backtrace turned out to be

Thread 13 "headoverheels" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffee0006c0 (LWP 15327)]
0x00005555555885bf in draw_sprite (bmp=0x7fffd1eeff40, sprite=0x7fffd1fbe790, x=70, y=13) at /home/dougmencken/boo/_rootdir/allegro-4.4.3.1/include/allegro/inline/draw.inl:238
238	AL_INLINE(void, draw_sprite, (BITMAP *bmp, BITMAP *sprite, int x, int y),

(gdb) bt
#0  0x00005555555885bf in draw_sprite (bmp=0x7fffd1eeff40, sprite=0x7fffd1fbe790, x=70, y=13) at /home/dougmencken/boo/_rootdir/allegro-4.4.3.1/include/allegro/inline/draw.inl:238
#1  allegro::drawSprite (sprite=..., x=70, y=13) at WrappersAllegro.cpp:1741
#2  0x0000555555610c8c in Miniature::draw (this=0x7fffd1fbffe0) at Miniature.cpp:478
#3  0x000055555561850b in Isomot::updateMe (this=this@entry=0x5555556dde48 <GameManager::instance+264>) at Isomot.cpp:248
#4  0x00005555555fea4c in GameManager::update (this=0x5555556ddd40 <GameManager::instance>) at GameManager.cpp:174
#5  0x00005555555fee6c in GameManager::begin (this=<optimized out>) at GameManager.cpp:139
#6  0x00005555555fef45 in GameManager::beginOrResume (pointerToBoolean=<optimized out>) at /home/dougmencken/boo/source/GameManager.hpp:49
#7  0x00007ffff76a1e2e in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447