发布于 2015-09-11 16:12:53 | 132 次阅读 | 评论: 0 | 来源: 网络整理
#
# 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.
#
try:
import tkinter
except ImportError:
import Tkinter
tkinter = Tkinter
del Tkinter
from PIL import Image
# --------------------------------------------------------------------
# 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
[docs]class PhotoImage:
"""
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.
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.
: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.
:keyword file: A filename to load the image from (using
``Image.open(file)``).
:keyword 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 "file" in kw:
image = Image.open(kw["file"])
del kw["file"]
elif "data" in kw:
from io import BytesIO
image = Image.open(BytesIO(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 = 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
def __str__(self):
"""
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).
"""
return str(self.__photo)
[docs] def width(self):
"""
Get the width of the image.
:return: The width, in pixels.
"""
return self.__size[0]
[docs] def height(self):
"""
Get the height of the image.
:return: The height, in pixels.
"""
return self.__size[1]
[docs] def paste(self, im, box=None):
"""
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.
"""
# 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 as v:
# activate Tkinter hook
try:
from PIL 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
[docs]class BitmapImage:
"""
A Tkinter-compatible bitmap image. This can be used everywhere Tkinter
expects an image object.
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 color for the
non-transparent parts. See the Tkinter documentation for information on
how to specify colours.
:param image: A PIL image.
"""
def __init__(self, image=None, **kw):
# Tk compatibility: file or data
if image is None:
if "file" in kw:
image = Image.open(kw["file"])
del kw["file"]
elif "data" in kw:
from io import BytesIO
image = Image.open(BytesIO(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 = 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
[docs] def width(self):
"""
Get the width of the image.
:return: The width, in pixels.
"""
return self.__size[0]
[docs] def height(self):
"""
Get the height of the image.
:return: The height, in pixels.
"""
return self.__size[1]
def __str__(self):
"""
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).
"""
return str(self.__photo)
def getimage(photo):
"""Copies the contents of a PhotoImage to a PIL image memory."""
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()