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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. | |
| # | |
| from __future__ import annotations | |
| from . 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 graylevels | |
| are allocated. For an "RGB" image, a 6x6x6 colour cube is used, together | |
| with 20 graylevels. | |
| 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 | |
| ``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. 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) | |
| def frombytes(self, buffer): | |
| """ | |
| Load display memory contents from byte data. | |
| :param buffer: A buffer containing display data (usually | |
| data returned from :py:func:`~PIL.ImageWin.Dib.tobytes`) | |
| """ | |
| 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() | |
| class Window: | |
| """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 | |
| super().__init__(title, width=width, height=height) | |
| def ui_handle_repair(self, dc, x0, y0, x1, y1): | |
| self.image.draw(dc, (x0, y0, x1, y1)) | |