297 lines
9 KiB
Python
297 lines
9 KiB
Python
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#
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# The Python Imaging Library.
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# $Id$
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#
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# a Tk display interface
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#
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# History:
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# 96-04-08 fl Created
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# 96-09-06 fl Added getimage method
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# 96-11-01 fl Rewritten, removed image attribute and crop method
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# 97-05-09 fl Use PyImagingPaste method instead of image type
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# 97-05-12 fl Minor tweaks to match the IFUNC95 interface
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# 97-05-17 fl Support the "pilbitmap" booster patch
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# 97-06-05 fl Added file= and data= argument to image constructors
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# 98-03-09 fl Added width and height methods to Image classes
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# 98-07-02 fl Use default mode for "P" images without palette attribute
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# 98-07-02 fl Explicitly destroy Tkinter image objects
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# 99-07-24 fl Support multiple Tk interpreters (from Greg Couch)
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# 99-07-26 fl Automatically hook into Tkinter (if possible)
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# 99-08-15 fl Hook uses _imagingtk instead of _imaging
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#
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# Copyright (c) 1997-1999 by Secret Labs AB
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# Copyright (c) 1996-1997 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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import Tkinter, Image
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##
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# The <b>ImageTk</b> module contains support to create and modify
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# Tkinter <b>BitmapImage</b> and <b>PhotoImage</b> objects.
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# <p>
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# For examples, see the demo programs in the <i>Scripts</i>
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# directory.
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##
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# --------------------------------------------------------------------
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# Check for Tkinter interface hooks
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_pilbitmap_ok = None
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def _pilbitmap_check():
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global _pilbitmap_ok
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if _pilbitmap_ok is None:
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try:
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im = Image.new("1", (1,1))
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Tkinter.BitmapImage(data="PIL:%d" % im.im.id)
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_pilbitmap_ok = 1
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except Tkinter.TclError:
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_pilbitmap_ok = 0
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return _pilbitmap_ok
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# --------------------------------------------------------------------
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# PhotoImage
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##
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# Creates a Tkinter-compatible photo image. This can be used
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# everywhere Tkinter expects an image object. If the image is an RGBA
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# image, pixels having alpha 0 are treated as transparent.
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class PhotoImage:
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##
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# Create a photo image object. The constructor takes either
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# a PIL image, or a mode and a size. Alternatively, you can
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# use the <b>file</b> or <b>data</b> options to initialize
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# the photo image object.
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# <p>
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# @def __init__(image=None, size=None, **options)
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# @param image Either a PIL image, or a mode string. If a
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# mode string is used, a size must also be given.
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# @param size If the first argument is a mode string, this
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# defines the size of the image.
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# @keyparam file A filename to load the image from (using
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# Image.open(file)).
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# @keyparam data An 8-bit string containing image data (as
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# loaded from an image file).
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def __init__(self, image=None, size=None, **kw):
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# Tk compatibility: file or data
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if image is None:
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if kw.has_key("file"):
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image = Image.open(kw["file"])
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del kw["file"]
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elif kw.has_key("data"):
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from StringIO import StringIO
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image = Image.open(StringIO(kw["data"]))
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del kw["data"]
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if hasattr(image, "mode") and hasattr(image, "size"):
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# got an image instead of a mode
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mode = image.mode
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if mode == "P":
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# palette mapped data
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image.load()
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try:
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mode = image.palette.mode
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except AttributeError:
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mode = "RGB" # default
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size = image.size
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kw["width"], kw["height"] = size
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else:
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mode = image
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image = None
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if mode not in ["1", "L", "RGB", "RGBA"]:
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mode = Image.getmodebase(mode)
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self.__mode = mode
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self.__size = size
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self.__photo = apply(Tkinter.PhotoImage, (), kw)
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self.tk = self.__photo.tk
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if image:
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self.paste(image)
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def __del__(self):
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name = self.__photo.name
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self.__photo.name = None
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try:
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self.__photo.tk.call("image", "delete", name)
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except:
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pass # ignore internal errors
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##
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# Get the Tkinter photo image identifier. This method is
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# automatically called by Tkinter whenever a PhotoImage object is
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# passed to a Tkinter method.
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#
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# @return A Tkinter photo image identifier (a string).
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def __str__(self):
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return str(self.__photo)
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##
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# Get the width of the image.
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#
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# @return The width, in pixels.
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def width(self):
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return self.__size[0]
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##
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# Get the height of the image.
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#
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# @return The height, in pixels.
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def height(self):
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return self.__size[1]
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##
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# Paste a PIL image into the photo image. Note that this can
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# be very slow if the photo image is displayed.
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#
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# @param im A PIL image. The size must match the target region.
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# If the mode does not match, the image is converted to the
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# mode of the bitmap image.
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# @param box A 4-tuple defining the left, upper, right, and
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# lower pixel coordinate. If None is given instead of a
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# tuple, all of the image is assumed.
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def paste(self, im, box=None):
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# convert to blittable
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im.load()
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image = im.im
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if image.isblock() and im.mode == self.__mode:
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block = image
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else:
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block = image.new_block(self.__mode, im.size)
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image.convert2(block, image) # convert directly between buffers
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tk = self.__photo.tk
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try:
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tk.call("PyImagingPhoto", self.__photo, block.id)
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except Tkinter.TclError, v:
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# activate Tkinter hook
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try:
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import _imagingtk
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try:
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_imagingtk.tkinit(tk.interpaddr(), 1)
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except AttributeError:
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_imagingtk.tkinit(id(tk), 0)
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tk.call("PyImagingPhoto", self.__photo, block.id)
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except (ImportError, AttributeError, Tkinter.TclError):
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raise # configuration problem; cannot attach to Tkinter
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# --------------------------------------------------------------------
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# BitmapImage
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##
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# Create a Tkinter-compatible bitmap image. This can be used
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# everywhere Tkinter expects an image object.
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class BitmapImage:
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##
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# Create a Tkinter-compatible bitmap image.
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# <p>
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# The given image must have mode "1". Pixels having value 0 are
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# treated as transparent. Options, if any, are passed on to
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# Tkinter. The most commonly used option is <b>foreground</b>,
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# which is used to specify the colour for the non-transparent
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# parts. See the Tkinter documentation for information on how to
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# specify colours.
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#
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# @def __init__(image=None, **options)
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# @param image A PIL image.
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def __init__(self, image=None, **kw):
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# Tk compatibility: file or data
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if image is None:
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if kw.has_key("file"):
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image = Image.open(kw["file"])
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del kw["file"]
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elif kw.has_key("data"):
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from StringIO import StringIO
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image = Image.open(StringIO(kw["data"]))
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del kw["data"]
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self.__mode = image.mode
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self.__size = image.size
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if _pilbitmap_check():
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# fast way (requires the pilbitmap booster patch)
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image.load()
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kw["data"] = "PIL:%d" % image.im.id
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self.__im = image # must keep a reference
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else:
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# slow but safe way
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kw["data"] = image.tobitmap()
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self.__photo = apply(Tkinter.BitmapImage, (), kw)
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def __del__(self):
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name = self.__photo.name
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self.__photo.name = None
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try:
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self.__photo.tk.call("image", "delete", name)
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except:
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pass # ignore internal errors
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##
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# Get the width of the image.
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#
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# @return The width, in pixels.
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def width(self):
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return self.__size[0]
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##
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# Get the height of the image.
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#
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# @return The height, in pixels.
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def height(self):
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return self.__size[1]
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##
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# Get the Tkinter bitmap image identifier. This method is
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# automatically called by Tkinter whenever a BitmapImage object
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# is passed to a Tkinter method.
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#
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# @return A Tkinter bitmap image identifier (a string).
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def __str__(self):
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return str(self.__photo)
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##
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# Copies the contents of a PhotoImage to a PIL image memory.
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def getimage(photo):
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photo.tk.call("PyImagingPhotoGet", photo)
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# --------------------------------------------------------------------
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# Helper for the Image.show method.
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def _show(image, title):
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class UI(Tkinter.Label):
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def __init__(self, master, im):
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if im.mode == "1":
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self.image = BitmapImage(im, foreground="white", master=master)
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else:
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self.image = PhotoImage(im, master=master)
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Tkinter.Label.__init__(self, master, image=self.image,
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bg="black", bd=0)
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if not Tkinter._default_root:
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raise IOError, "tkinter not initialized"
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top = Tkinter.Toplevel()
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if title:
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top.title(title)
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UI(top, image).pack()
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