int ysize = MAX(1, g->anim_frames / xsize);
int xoffset = g->anim_start_frame % xsize;
int yoffset = g->anim_start_frame % ysize;
int ysize = MAX(1, g->anim_frames / xsize);
int xoffset = g->anim_start_frame % xsize;
int yoffset = g->anim_start_frame % ysize;