# # The Python Imaging Library. # $Id$ # # a Tk display interface # # History: # 96-04-08 fl Created # 96-09-06 fl Added getimage method # 96-11-01 fl Rewritten, removed image attribute and crop method # 97-05-09 fl Use PyImagingPaste method instead of image type # 97-05-12 fl Minor tweaks to match the IFUNC95 interface # 97-05-17 fl Support the "pilbitmap" booster patch # 97-06-05 fl Added file= and data= argument to image constructors # 98-03-09 fl Added width and height methods to Image classes # 98-07-02 fl Use default mode for "P" images without palette attribute # 98-07-02 fl Explicitly destroy Tkinter image objects # 99-07-24 fl Support multiple Tk interpreters (from Greg Couch) # 99-07-26 fl Automatically hook into Tkinter (if possible) # 99-08-15 fl Hook uses _imagingtk instead of _imaging # # Copyright (c) 1997-1999 by Secret Labs AB # Copyright (c) 1996-1997 by Fredrik Lundh # # See the README file for information on usage and redistribution. # import Tkinter, Image ## # The ImageTk module contains support to create and modify # Tkinter BitmapImage and PhotoImage objects. #

# For examples, see the demo programs in the Scripts # directory. ## # -------------------------------------------------------------------- # Check for Tkinter interface hooks _pilbitmap_ok = None def _pilbitmap_check(): global _pilbitmap_ok if _pilbitmap_ok is None: try: im = Image.new("1", (1,1)) Tkinter.BitmapImage(data="PIL:%d" % im.im.id) _pilbitmap_ok = 1 except Tkinter.TclError: _pilbitmap_ok = 0 return _pilbitmap_ok # -------------------------------------------------------------------- # PhotoImage ## # Creates a Tkinter-compatible photo image. This can be used # everywhere Tkinter expects an image object. If the image is an RGBA # image, pixels having alpha 0 are treated as transparent. class PhotoImage: ## # Create a photo image object. The constructor takes either # a PIL image, or a mode and a size. Alternatively, you can # use the file or data options to initialize # the photo image object. #

# @def __init__(image=None, size=None, **options) # @param image Either a PIL image, or a mode string. If a # mode string is used, a size must also be given. # @param size If the first argument is a mode string, this # defines the size of the image. # @keyparam file A filename to load the image from (using # Image.open(file)). # @keyparam data An 8-bit string containing image data (as # loaded from an image file). def __init__(self, image=None, size=None, **kw): # Tk compatibility: file or data if image is None: if kw.has_key("file"): image = Image.open(kw["file"]) del kw["file"] elif kw.has_key("data"): from StringIO import StringIO image = Image.open(StringIO(kw["data"])) del kw["data"] if hasattr(image, "mode") and hasattr(image, "size"): # got an image instead of a mode mode = image.mode if mode == "P": # palette mapped data image.load() try: mode = image.palette.mode except AttributeError: mode = "RGB" # default size = image.size kw["width"], kw["height"] = size else: mode = image image = None if mode not in ["1", "L", "RGB", "RGBA"]: mode = Image.getmodebase(mode) self.__mode = mode self.__size = size self.__photo = apply(Tkinter.PhotoImage, (), kw) self.tk = self.__photo.tk if image: self.paste(image) def __del__(self): name = self.__photo.name self.__photo.name = None try: self.__photo.tk.call("image", "delete", name) except: pass # ignore internal errors ## # Get the Tkinter photo image identifier. This method is # automatically called by Tkinter whenever a PhotoImage object is # passed to a Tkinter method. # # @return A Tkinter photo image identifier (a string). def __str__(self): return str(self.__photo) ## # Get the width of the image. # # @return The width, in pixels. def width(self): return self.__size[0] ## # Get the height of the image. # # @return The height, in pixels. def height(self): return self.__size[1] ## # Paste a PIL image into the photo image. Note that this can # be very slow if the photo image is displayed. # # @param im A PIL image. The size must match the target region. # If the mode does not match, the image is converted to the # mode of the bitmap image. # @param box A 4-tuple defining the left, upper, right, and # lower pixel coordinate. If None is given instead of a # tuple, all of the image is assumed. def paste(self, im, box=None): # convert to blittable im.load() image = im.im if image.isblock() and im.mode == self.__mode: block = image else: block = image.new_block(self.__mode, im.size) image.convert2(block, image) # convert directly between buffers tk = self.__photo.tk try: tk.call("PyImagingPhoto", self.__photo, block.id) except Tkinter.TclError, v: # activate Tkinter hook try: import _imagingtk try: _imagingtk.tkinit(tk.interpaddr(), 1) except AttributeError: _imagingtk.tkinit(id(tk), 0) tk.call("PyImagingPhoto", self.__photo, block.id) except (ImportError, AttributeError, Tkinter.TclError): raise # configuration problem; cannot attach to Tkinter # -------------------------------------------------------------------- # BitmapImage ## # Create a Tkinter-compatible bitmap image. This can be used # everywhere Tkinter expects an image object. class BitmapImage: ## # Create a Tkinter-compatible bitmap image. #

# The given image must have mode "1". Pixels having value 0 are # treated as transparent. Options, if any, are passed on to # Tkinter. The most commonly used option is foreground, # which is used to specify the colour for the non-transparent # parts. See the Tkinter documentation for information on how to # specify colours. # # @def __init__(image=None, **options) # @param image A PIL image. def __init__(self, image=None, **kw): # Tk compatibility: file or data if image is None: if kw.has_key("file"): image = Image.open(kw["file"]) del kw["file"] elif kw.has_key("data"): from StringIO import StringIO image = Image.open(StringIO(kw["data"])) del kw["data"] self.__mode = image.mode self.__size = image.size if _pilbitmap_check(): # fast way (requires the pilbitmap booster patch) image.load() kw["data"] = "PIL:%d" % image.im.id self.__im = image # must keep a reference else: # slow but safe way kw["data"] = image.tobitmap() self.__photo = apply(Tkinter.BitmapImage, (), kw) def __del__(self): name = self.__photo.name self.__photo.name = None try: self.__photo.tk.call("image", "delete", name) except: pass # ignore internal errors ## # Get the width of the image. # # @return The width, in pixels. def width(self): return self.__size[0] ## # Get the height of the image. # # @return The height, in pixels. def height(self): return self.__size[1] ## # Get the Tkinter bitmap image identifier. This method is # automatically called by Tkinter whenever a BitmapImage object # is passed to a Tkinter method. # # @return A Tkinter bitmap image identifier (a string). def __str__(self): return str(self.__photo) ## # Copies the contents of a PhotoImage to a PIL image memory. def getimage(photo): photo.tk.call("PyImagingPhotoGet", photo) # -------------------------------------------------------------------- # Helper for the Image.show method. def _show(image, title): class UI(Tkinter.Label): def __init__(self, master, im): if im.mode == "1": self.image = BitmapImage(im, foreground="white", master=master) else: self.image = PhotoImage(im, master=master) Tkinter.Label.__init__(self, master, image=self.image, bg="black", bd=0) if not Tkinter._default_root: raise IOError, "tkinter not initialized" top = Tkinter.Toplevel() if title: top.title(title) UI(top, image).pack()