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+#
+# The Python Imaging Library.
+# $Id$
+#
+# a Windows DIB display interface
+#
+# History:
+# 1996-05-20 fl Created
+# 1996-09-20 fl Fixed subregion exposure
+# 1997-09-21 fl Added draw primitive (for tzPrint)
+# 2003-05-21 fl Added experimental Window/ImageWindow classes
+# 2003-09-05 fl Added fromstring/tostring methods
+#
+# Copyright (c) Secret Labs AB 1997-2003.
+# Copyright (c) Fredrik Lundh 1996-2003.
+#
+# See the README file for information on usage and redistribution.
+#
+
+import warnings
+from PIL import Image
+
+
+class HDC:
+ """
+ Wraps an HDC integer. The resulting object can be passed to the
+ :py:meth:`~PIL.ImageWin.Dib.draw` and :py:meth:`~PIL.ImageWin.Dib.expose`
+ methods.
+ """
+ def __init__(self, dc):
+ self.dc = dc
+
+ def __int__(self):
+ return self.dc
+
+
+class HWND:
+ """
+ Wraps an HWND integer. The resulting object can be passed to the
+ :py:meth:`~PIL.ImageWin.Dib.draw` and :py:meth:`~PIL.ImageWin.Dib.expose`
+ methods, instead of a DC.
+ """
+ def __init__(self, wnd):
+ self.wnd = wnd
+
+ def __int__(self):
+ return self.wnd
+
+
+class Dib:
+ """
+ A Windows bitmap with the given mode and size. The mode can be one of "1",
+ "L", "P", or "RGB".
+
+ If the display requires a palette, this constructor creates a suitable
+ palette and associates it with the image. For an "L" image, 128 greylevels
+ are allocated. For an "RGB" image, a 6x6x6 colour cube is used, together
+ with 20 greylevels.
+
+ To make sure that palettes work properly under Windows, you must call the
+ **palette** method upon certain events from Windows.
+
+ :param image: Either a PIL image, or a mode string. If a mode string is
+ used, a size must also be given. The mode can be one of "1",
+ "L", "P", or "RGB".
+ :param size: If the first argument is a mode string, this
+ defines the size of the image.
+ """
+
+ def __init__(self, image, size=None):
+ if hasattr(image, "mode") and hasattr(image, "size"):
+ mode = image.mode
+ size = image.size
+ else:
+ mode = image
+ image = None
+ if mode not in ["1", "L", "P", "RGB"]:
+ mode = Image.getmodebase(mode)
+ self.image = Image.core.display(mode, size)
+ self.mode = mode
+ self.size = size
+ if image:
+ self.paste(image)
+
+ def expose(self, handle):
+ """
+ Copy the bitmap contents to a device context.
+
+ :param handle: Device context (HDC), cast to a Python integer, or an
+ HDC or HWND instance. In PythonWin, you can use the
+ :py:meth:`CDC.GetHandleAttrib` to get a suitable handle.
+ """
+ if isinstance(handle, HWND):
+ dc = self.image.getdc(handle)
+ try:
+ result = self.image.expose(dc)
+ finally:
+ self.image.releasedc(handle, dc)
+ else:
+ result = self.image.expose(handle)
+ return result
+
+ def draw(self, handle, dst, src=None):
+ """
+ Same as expose, but allows you to specify where to draw the image, and
+ what part of it to draw.
+
+ The destination and source areas are given as 4-tuple rectangles. If
+ the source is omitted, the entire image is copied. If the source and
+ the destination have different sizes, the image is resized as
+ necessary.
+ """
+ if not src:
+ src = (0, 0) + self.size
+ if isinstance(handle, HWND):
+ dc = self.image.getdc(handle)
+ try:
+ result = self.image.draw(dc, dst, src)
+ finally:
+ self.image.releasedc(handle, dc)
+ else:
+ result = self.image.draw(handle, dst, src)
+ return result
+
+ def query_palette(self, handle):
+ """
+ Installs the palette associated with the image in the given device
+ context.
+
+ This method should be called upon **QUERYNEWPALETTE** and
+ **PALETTECHANGED** events from Windows. If this method returns a
+ non-zero value, one or more display palette entries were changed, and
+ the image should be redrawn.
+
+ :param handle: Device context (HDC), cast to a Python integer, or an
+ HDC or HWND instance.
+ :return: A true value if one or more entries were changed (this
+ indicates that the image should be redrawn).
+ """
+ if isinstance(handle, HWND):
+ handle = self.image.getdc(handle)
+ try:
+ result = self.image.query_palette(handle)
+ finally:
+ self.image.releasedc(handle, handle)
+ else:
+ result = self.image.query_palette(handle)
+ return result
+
+ def paste(self, im, box=None):
+ """
+ Paste a PIL image into the bitmap image.
+
+ :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.
+ """
+ im.load()
+ if self.mode != im.mode:
+ im = im.convert(self.mode)
+ if box:
+ self.image.paste(im.im, box)
+ else:
+ self.image.paste(im.im)
+
+ def frombytes(self, buffer):
+ """
+ Load display memory contents from byte data.
+
+ :param buffer: A buffer containing display data (usually
+ data returned from <b>tobytes</b>)
+ """
+ return self.image.frombytes(buffer)
+
+ def tobytes(self):
+ """
+ Copy display memory contents to bytes object.
+
+ :return: A bytes object containing display data.
+ """
+ return self.image.tobytes()
+
+ ##
+ # Deprecated aliases to frombytes & tobytes.
+
+ def fromstring(self, *args, **kw):
+ warnings.warn(
+ 'fromstring() is deprecated. Please call frombytes() instead.',
+ DeprecationWarning,
+ stacklevel=2
+ )
+ return self.frombytes(*args, **kw)
+
+ def tostring(self):
+ warnings.warn(
+ 'tostring() is deprecated. Please call tobytes() instead.',
+ DeprecationWarning,
+ stacklevel=2
+ )
+ return self.tobytes()
+
+
+##
+# Create a Window with the given title size.
+
+class Window:
+
+ def __init__(self, title="PIL", width=None, height=None):
+ self.hwnd = Image.core.createwindow(
+ title, self.__dispatcher, width or 0, height or 0
+ )
+
+ def __dispatcher(self, action, *args):
+ return getattr(self, "ui_handle_" + action)(*args)
+
+ def ui_handle_clear(self, dc, x0, y0, x1, y1):
+ pass
+
+ def ui_handle_damage(self, x0, y0, x1, y1):
+ pass
+
+ def ui_handle_destroy(self):
+ pass
+
+ def ui_handle_repair(self, dc, x0, y0, x1, y1):
+ pass
+
+ def ui_handle_resize(self, width, height):
+ pass
+
+ def mainloop(self):
+ Image.core.eventloop()
+
+
+##
+# Create an image window which displays the given image.
+
+class ImageWindow(Window):
+
+ def __init__(self, image, title="PIL"):
+ if not isinstance(image, Dib):
+ image = Dib(image)
+ self.image = image
+ width, height = image.size
+ Window.__init__(self, title, width=width, height=height)
+
+ def ui_handle_repair(self, dc, x0, y0, x1, y1):
+ self.image.draw(dc, (x0, y0, x1, y1))