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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
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+#
+# The Python Imaging Library.
+# $Id$
+#
+# transform wrappers
+#
+# History:
+# 2002-04-08 fl Created
+#
+# Copyright (c) 2002 by Secret Labs AB
+# Copyright (c) 2002 by Fredrik Lundh
+#
+# See the README file for information on usage and redistribution.
+#
+
+from . import Image
+
+
+class Transform(Image.ImageTransformHandler):
+ def __init__(self, data):
+ self.data = data
+
+ def getdata(self):
+ return self.method, self.data
+
+ def transform(self, size, image, **options):
+ # can be overridden
+ method, data = self.getdata()
+ return image.transform(size, method, data, **options)
+
+
+class AffineTransform(Transform):
+ """
+ Define an affine image transform.
+
+ This function takes a 6-tuple (a, b, c, d, e, f) which contain the first
+ two rows from an affine transform matrix. For each pixel (x, y) in the
+ output image, the new value is taken from a position (a x + b y + c,
+ d x + e y + f) in the input image, rounded to nearest pixel.
+
+ This function can be used to scale, translate, rotate, and shear the
+ original image.
+
+ See :py:meth:`~PIL.Image.Image.transform`
+
+ :param matrix: A 6-tuple (a, b, c, d, e, f) containing the first two rows
+ from an affine transform matrix.
+ """
+
+ method = Image.Transform.AFFINE
+
+
+class ExtentTransform(Transform):
+ """
+ Define a transform to extract a subregion from an image.
+
+ Maps a rectangle (defined by two corners) from the image to a rectangle of
+ the given size. The resulting image will contain data sampled from between
+ the corners, such that (x0, y0) in the input image will end up at (0,0) in
+ the output image, and (x1, y1) at size.
+
+ This method can be used to crop, stretch, shrink, or mirror an arbitrary
+ rectangle in the current image. It is slightly slower than crop, but about
+ as fast as a corresponding resize operation.
+
+ See :py:meth:`~PIL.Image.Image.transform`
+
+ :param bbox: A 4-tuple (x0, y0, x1, y1) which specifies two points in the
+ input image's coordinate system. See :ref:`coordinate-system`.
+ """
+
+ method = Image.Transform.EXTENT
+
+
+class QuadTransform(Transform):
+ """
+ Define a quad image transform.
+
+ Maps a quadrilateral (a region defined by four corners) from the image to a
+ rectangle of the given size.
+
+ See :py:meth:`~PIL.Image.Image.transform`
+
+ :param xy: An 8-tuple (x0, y0, x1, y1, x2, y2, x3, y3) which contain the
+ upper left, lower left, lower right, and upper right corner of the
+ source quadrilateral.
+ """
+
+ method = Image.Transform.QUAD
+
+
+class MeshTransform(Transform):
+ """
+ Define a mesh image transform. A mesh transform consists of one or more
+ individual quad transforms.
+
+ See :py:meth:`~PIL.Image.Image.transform`
+
+ :param data: A list of (bbox, quad) tuples.
+ """
+
+ method = Image.Transform.MESH