1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
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4 Introduction
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7 Some video capture devices can sample a subsec
8 shrink or enlarge it to an image of arbitrary
9 can insert the image into larger one. Some vid
10 part of an input image, scale it up or down an
11 arbitrary scan line and horizontal offset into
12 these abilities cropping, scaling and composin
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14 On a video *capture* device the source is a vi
15 cropping target determine the area actually sa
16 image stored in a memory buffer. The composing
17 of the buffer is actually written to by the ha
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19 On a video *output* device the source is an im
20 and the cropping target is a part of an image
21 The sink is the display or the graphics screen
22 select the part of display where the image sho
23 and position of such a window is controlled by
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25 Rectangles for all cropping and composing targ
26 the device does supports neither cropping nor
27 position will be fixed in such a case. If the
28 scaling then the cropping and composing rectan
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