i have an Image , and with a mask on it .
the code some like this :
my_image:setMaskImage(ditherMask)
now , i hope to add another mask on it , so i can do some more extra drawing . what shoud i do ?
(that is why lead me to : can i merge the last mask to the image , so i can get an image without a mask , so i can add a new mask on it )