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lib/python3.5/site-packages/PIL/ImageTransform.py

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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 PIL 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)
+
+
+##
+# Define an affine image transform.
+# <p>
+# This function takes a 6-tuple (<i>a, b, c, d, e, f</i>) which
+# contain the first two rows from an affine transform matrix. For
+# each pixel (<i>x, y</i>) in the output image, the new value is
+# taken from a position (a <i>x</i> + b <i>y</i> + c,
+# d <i>x</i> + e <i>y</i> + f) in the input image, rounded to
+# nearest pixel.
+# <p>
+# This function can be used to scale, translate, rotate, and shear the
+# original image.
+#
+# @def AffineTransform(matrix)
+# @param matrix A 6-tuple (<i>a, b, c, d, e, f</i>) containing
+#    the first two rows from an affine transform matrix.
+# @see Image#Image.transform
+
+
+class AffineTransform(Transform):
+    method = Image.AFFINE
+
+
+##
+# Define a transform to extract a subregion from an image.
+# <p>
+# 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 (<i>x0, y0</i>)
+# in the input image will end up at (0,0) in the output image,
+# and (<i>x1, y1</i>) at <i>size</i>.
+# <p>
+# This method can be used to crop, stretch, shrink, or mirror an
+# arbitrary rectangle in the current image. It is slightly slower than
+# <b>crop</b>, but about as fast as a corresponding <b>resize</b>
+# operation.
+#
+# @def ExtentTransform(bbox)
+# @param bbox A 4-tuple (<i>x0, y0, x1, y1</i>) which specifies
+#    two points in the input image's coordinate system.
+# @see Image#Image.transform
+
+class ExtentTransform(Transform):
+    method = Image.EXTENT
+
+
+##
+# Define an quad image transform.
+# <p>
+# Maps a quadrilateral (a region defined by four corners) from the
+# image to a rectangle of the given size.
+#
+# @def QuadTransform(xy)
+# @param xy An 8-tuple (<i>x0, y0, x1, y1, x2, y2, y3, y3</i>) which
+#   contain the upper left, lower left, lower right, and upper right
+#   corner of the source quadrilateral.
+# @see Image#Image.transform
+
+class QuadTransform(Transform):
+    method = Image.QUAD
+
+
+##
+# Define an mesh image transform.  A mesh transform consists of one
+# or more individual quad transforms.
+#
+# @def MeshTransform(data)
+# @param data A list of (bbox, quad) tuples.
+# @see Image#Image.transform
+
+class MeshTransform(Transform):
+    method = Image.MESH