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300 lines
9.1 KiB
300 lines
9.1 KiB
#
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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
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from io import BytesIO
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from . import Image
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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=f"PIL:{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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def _get_image_from_kw(kw):
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source = None
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if "file" in kw:
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source = kw.pop("file")
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elif "data" in kw:
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source = BytesIO(kw.pop("data"))
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if source:
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return Image.open(source)
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# --------------------------------------------------------------------
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# PhotoImage
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class PhotoImage:
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"""
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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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The constructor takes either a PIL image, or a mode and a size.
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Alternatively, you can use the ``file`` or ``data`` options to initialize
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the photo image object.
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:param image: Either a PIL image, or a mode string. If a mode string is
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used, a size must also be given.
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:param size: If the first argument is a mode string, this defines the size
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of the image.
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:keyword file: A filename to load the image from (using
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``Image.open(file)``).
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:keyword data: An 8-bit string containing image data (as loaded from an
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image file).
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"""
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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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image = _get_image_from_kw(kw)
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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 = 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 Exception:
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pass # ignore internal errors
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def __str__(self):
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"""
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Get the Tkinter photo image identifier. This method is automatically
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called by Tkinter whenever a PhotoImage object is passed to a Tkinter
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method.
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:return: A Tkinter photo image identifier (a string).
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"""
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return str(self.__photo)
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def width(self):
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"""
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Get the width of the image.
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:return: The width, in pixels.
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"""
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return self.__size[0]
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def height(self):
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"""
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Get the height of the image.
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:return: The height, in pixels.
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"""
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return self.__size[1]
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def paste(self, im, box=None):
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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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:param im: A PIL image. The size must match the target region. If the
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mode does not match, the image is converted to the mode of
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the bitmap image.
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:param box: A 4-tuple defining the left, upper, right, and lower pixel
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coordinate. See :ref:`coordinate-system`. If None is given
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instead of a tuple, all of the image is assumed.
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"""
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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:
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# activate Tkinter hook
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try:
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from . import _imagingtk
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try:
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if hasattr(tk, "interp"):
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# Required for PyPy, which always has CFFI installed
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from cffi import FFI
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ffi = FFI()
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# PyPy is using an FFI CDATA element
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# (Pdb) self.tk.interp
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# <cdata 'Tcl_Interp *' 0x3061b50>
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_imagingtk.tkinit(int(ffi.cast("uintptr_t", tk.interp)), 1)
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else:
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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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class BitmapImage:
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"""
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A Tkinter-compatible bitmap image. This can be used everywhere Tkinter
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expects an image object.
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The given image must have mode "1". Pixels having value 0 are treated as
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transparent. Options, if any, are passed on to Tkinter. The most commonly
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used option is ``foreground``, which is used to specify the color for the
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non-transparent parts. See the Tkinter documentation for information on
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how to specify colours.
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:param image: A PIL image.
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"""
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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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image = _get_image_from_kw(kw)
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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"] = f"PIL:{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 = 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 Exception:
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pass # ignore internal errors
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def width(self):
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"""
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Get the width of the image.
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:return: The width, in pixels.
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"""
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return self.__size[0]
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def height(self):
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"""
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Get the height of the image.
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:return: The height, in pixels.
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"""
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return self.__size[1]
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def __str__(self):
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"""
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Get the Tkinter bitmap image identifier. This method is automatically
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called by Tkinter whenever a BitmapImage object is passed to a Tkinter
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method.
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:return: A Tkinter bitmap image identifier (a string).
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"""
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return str(self.__photo)
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def getimage(photo):
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"""Copies the contents of a PhotoImage to a PIL image memory."""
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im = Image.new("RGBA", (photo.width(), photo.height()))
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block = im.im
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photo.tk.call("PyImagingPhotoGet", photo, block.id)
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return im
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def _show(image, title):
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"""Helper for the Image.show method."""
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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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super().__init__(master, image=self.image, bg="black", bd=0)
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if not tkinter._default_root:
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raise OSError("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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