53     uchar **stack_top, **stack_bottom = 0;  in cvCanny()  local
135     CV_CALL( stack_top = stack_bottom = (uchar**)cvAlloc( maxsize*sizeof(stack_top[0]) ));  in cvCanny()
153     #define CANNY_PUSH(d)    *(d) = (uchar)2, *stack_top++ = (d)  in cvCanny()
154     #define CANNY_POP(d)     (d) = *--stack_top  in cvCanny()
219         if( (stack_top - stack_bottom) + size.width > maxsize )  in cvCanny()
223             CV_CALL( new_stack_bottom = (uchar**)cvAlloc( maxsize * sizeof(stack_top[0])) );  in cvCanny()
224 …         memcpy( new_stack_bottom, stack_bottom, (stack_top - stack_bottom)*sizeof(stack_top[0]) );  in cvCanny()
225             stack_top = new_stack_bottom + (stack_top - stack_bottom);  in cvCanny()
305     while( stack_top > stack_bottom )  in cvCanny()
308         if( (stack_top - stack_bottom) + 8 > maxsize )  in cvCanny()
312             CV_CALL( new_stack_bottom = (uchar**)cvAlloc( maxsize * sizeof(stack_top[0])) );  in cvCanny()
313 …         memcpy( new_stack_bottom, stack_bottom, (stack_top - stack_bottom)*sizeof(stack_top[0]) );  in cvCanny()
314             stack_top = new_stack_bottom + (stack_top - stack_bottom);  in cvCanny()