Source code for PIL.ImageWin

#
# 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.
#

from . import Image


[docs]class HDC(object): """ 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
[docs]class HWND(object): """ 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
[docs]class Dib(object): """ 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)
[docs] 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
[docs] 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
[docs] 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
[docs] 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. See :ref:`coordinate-system`. 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)
[docs] 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)
[docs] def tobytes(self): """ Copy display memory contents to bytes object. :return: A bytes object containing display data. """ return self.image.tobytes()
class Window(object): """Create a Window with the given title size.""" 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() class ImageWindow(Window): """Create an image window which displays the given image.""" 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))