kopia lustrzana https://gitlab.com/sane-project/backends
319 wiersze
10 KiB
Groff
319 wiersze
10 KiB
Groff
.TH sane-test 5 "24 Jul 2002" "@PACKAGEVERSION@" "SANE Scanner Access Now Easy"
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.IX sane-test
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.SH NAME
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sane-test \- SANE backend for testing frontends
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.SH DESCRIPTION
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The
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.B sane-test
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library implements a SANE (Scanner Access Now Easy) backend that allows
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testing the SANE installation and SANE frontends. It provides access to a
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(nearly) unlimited number of virtual devices. There is no support for real
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scanners or cameras. However, the backend simulates scanning and setting
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options.
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.PP
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The idea is not only to find bugs in frontends but also to show all
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capabilities of SANE. Therefore
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.B sane-test
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implements functions and options that are not (or seldomly) found in other
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backends.
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.PP
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The backend is commented out in @CONFIGDIR@/dll.conf, so either the comment
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character must be removed or the backend must be called explicitely. E.g.
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`scanimage -d test' or `xscanimage test'.
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.SH SCAN MODE OPTIONS
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Option
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.B mode
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selects the scan mode (Gray or Color).
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.PP
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Option
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.B depth
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determines the number of bits per sample (1. 8, or 16). Keep in mind, that
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this value refers to the sample, not the pixel. So depth=16 results in 48
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bits per pixel in color mode. The most usual combinations are mode=Gray,
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depth=1 for lineart, mode=Gray, depth=8 for gray and mode=Color, depth=8 for
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color mode. The combination of color and 1-bit mode is quite obscure (8
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colors) but allowed in the SANE standard. However, the meaning of bits is not
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defined. Currently 1 = high intensity and 0 = low intensity is used.
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.PP
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Setting option
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.B hand-scanner
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results in the test-backend behaving like a hand-scanner. Hand-scanners do
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not know the image height a priori. Instead, they return a height of -1.
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Setting this option allows to test whether a frontend can handle this
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correctly. This option also enables a fixed width of 11 cm.
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.PP
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Setting option
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.B three-pass
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simulates a three-pass scanner. Older color scanners needed to scan the image
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once per color (reg/green/blue) to get the full image. Therefore, in this mode
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three single frames are transmitted in color mode.
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.PP
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Option
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.B three-pass-order
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provides support for changing the order of the three frames (see option
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three-pass above). A frontend should support all orders.
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.PP
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Option
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.B resolution
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sets the resolution of the image in dots per inch.
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.PP
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.SH SPECIAL OPTIONS
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Option
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.B test-picture
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allows to set the image that's returned to the frontend. While "Solid white"
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and "Solid black" are quite obvious, the other options need some more
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explanation. Color patterns are used to determine if all modes and their
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colors are reprented correctly by the frontend. The grid should look like the
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same in every mode and resolution. A table of all the test pictures can be
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found at: http://www.meier-geinitz.de/sane/test-backend/test-pictures.html.
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.PP
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If option
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.B invert-endianess
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is set, the upper and lower bytes of image data in 16 bit modes are exchanged.
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This option can be used to test the 16 bit modes of frontends, e.g. if the
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frontend uses the correct endianess.
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.PP
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If option
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.B read-limit
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is set, the maximum amount of data tranferred with each call to sane_read() is
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limited.
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.PP
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Option
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.B read-limit-size
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sets the limit for option read-limit. A low limit slows down scanning. It
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can be used to detect errors in frontend that occur because of wrong
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assumptions on the size of the buffer or timing problems.
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.PP
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Option
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.B read-delay
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enables delaying data to the frontend.
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.PP
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Option
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.B read-delay-duration
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selects the number of microseconds the backends waits after each transfer of a
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buffer. This option is useful to find timing-related bugs, especially if
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used over the network.
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.PP
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If option
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.B read-return-value
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is different from "Default", the selected status will be returned by every
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call to sane_read(). This is useful to test the frontend's handling of the
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SANE statii.
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.PP
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If option
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.B ppl-loss
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is different from 0, it determines the number of pixels that are "lost" at the
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end of each line. That means, lines are padded with unused data.
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.PP
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Option
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.B fuzzy-parameters
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selects that fuzzy (inexact) parameters are returned as long as the scan
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hasn't been started. This option can be used to test if the frontend uses the
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parameters it got before the start of the scan (which it shouldn't).
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.PP
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Option
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.B non-blocking
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determines if non-blocking IO for sane_read() should be used if supported by
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the frontend.
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.PP
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If option
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.B select-fd
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is set, the backend offers a select filedescriptor for detecting if
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sane_read() will return data.
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.PP
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If option
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.B enable-test-options
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is set, a fairly big list of options for testing the various SANE option
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types is enabled.
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.PP
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Option
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.B print-options
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can be used to print a list of all options to standard error.
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.PP
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.SH GEOMETRY OPTIONS
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Option
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.B tl-x
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determines the top-left x position of the scan area.
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.PP
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Option
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.B tl-y
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determines the top-left y position of the scan area.
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.PP
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Option
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.B br-x
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determines the bottom-right x position of the scan area.
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.PP
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Option
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.B br-y
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determines the bottom-right y position of the scan area.
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.PP
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.SH BOOL TEST OPTIONS
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There are 6 bool test options in total. Each option is numbered. (3/6)
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means: this is option 3 of 6. The numbering scheme is inetended for easier
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detection of options not displayed by the frontend (bevause of missing support
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or bugs).
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.PP
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Option
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.B bool-soft-select-soft-detect
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(1/6) is a bool test option that has soft select and soft detect (and
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advanced) capabilities. That's just a normal bool option.
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.PP
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Option
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.B bool-hard-select-soft-detect
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(2/6) is a bool test option that has hard select and soft detect (and
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advanced) capabilities. That means the option can't be set by the frontend
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but by the user (e.g. by pressing a button at the device).
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.PP
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Option
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.B bool-hard-select
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(3/6) is a bool test option that has hard select (and advanced) capabilities.
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That means the option can't be set by the frontend but by the user (e.g. by
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pressing a button at the device) and can't be read by the frontend.
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.PP
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Option
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.B bool-soft-detect
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(4/6) is a bool test option that has soft detect (and advanced)
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capabilities. That means the option is read-only.
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.PP
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Option
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.B bool-soft-select-soft-detect-emulated
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(5/6) is a Bool test option that has soft select, soft detect, and emulated
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(and advanced) capabilities.
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.PP
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Option
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.B bool-soft-select-soft-detect-auto
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(6/6) is a Bool test option that has soft select, soft detect, and automatic
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(and advanced) capabilities. This option can be automatically set by the
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backend.
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.PP
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.SH INT TEST OPTIONS
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There are 6 int test options in total.
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.PP
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Option
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.B int
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(1/6) is an int test option with no unit and no constraint set.
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.PP
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Option
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.B int-constraint-range
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(2/6) is an int test option with unit pixel and constraint range set. Minimum
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is 4, maximum 192, and quant is 2.
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.PP
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Option
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.B int-constraint-word-list
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(3/6) is an int test option with unit bits and constraint word list set.
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.PP
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Option
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.B int-constraint-array
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(4/6) is an int test option with unit mm and using an array without
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constraints.
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.PP
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Option
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.B int-constraint-array-constraint-range
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(5/6) is an int test option with unit mm and using an array with a range
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constraint. Minimum is 4, maximum 192, and quant is 2.
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.PP
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Option
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.B int-constraint-array-constraint-word-list
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(6/6) is an int test option with unit percent and using an array a word list
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constraint.
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.SH FIXED TEST OPTIONS
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There are 3 fixed test options in total.
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.PP
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Option
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.B fixed
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(1/3) is a fixed test option with no unit and no constraint set.
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.PP
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Option
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.B fixed-constraint-range
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(2/3) is a fixed test option with unit microsecond and constraint range
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set. Minimum is -42.17, maximum 32767.9999, and quant is 2.0.
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.PP
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Option
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.B fixed-constraint-word-list
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(3/3) is a Fixed test option with no unit and constraint word list set.
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.PP
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.SH STRING TEST OPTIONS
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There are 3 string test options in total.
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.PP
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Option
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.B string
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(1/3) is a string test option without constraint.
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.PP
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Option
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.B string-constraint-string-list
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(2/3) is a string test option with string list constraint.
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.PP
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Option
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.B string-constraint-long-string-list
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(3/3) is a string test option with string list constraint. Contains some more
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entries...
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.PP
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.SH BUTTON TEST OPTION
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Option
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.B button
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(1/1) is a Button test option. Prints some text...
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.PP
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.SH FILES
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.TP
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.I @CONFIGDIR@/test.conf
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The backend configuration file (see also description of
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.B SANE_CONFIG_DIR
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below). The initial values of most of the basic SANE options can be configured
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in this file. A template containing all the default values is provided
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together with this backend. One of the more interesting values may be
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.BR number_of_devices .
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It can be used to check the frontend's ability to show a long list of devices.
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The config values concerning resolution and geometry can be useful to test
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the handling of big file sizes.
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.TP
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.I @LIBDIR@/libsane-test.a
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The static library implementing this backend.
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.TP
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.I @LIBDIR@/libsane-test.so
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The shared library implementing this backend (present on systems that
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support dynamic loading).
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.SH ENVIRONMENT
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.TP
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.B SANE_CONFIG_DIR
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This environment variable specifies the list of directories that may
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contain the configuration file. Under UNIX, the directories are
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separated by a colon (`:'), under OS/2, they are separated by a
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semi-colon (`;'). If this variable is not set, the configuration file
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is searched in two default directories: first, the current working
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directory (".") and then in @CONFIGDIR@. If the value of the
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environment variable ends with the directory separator character, then
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the default directories are searched after the explicitly specified
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directories. For example, setting
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.B SANE_CONFIG_DIR
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to "/tmp/config:" would result in directories "tmp/config", ".", and
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"@CONFIGDIR@" being searched (in this order).
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.TP
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.B SANE_DEBUG_TEST
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If the library was compiled with debug support enabled, this
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environment variable controls the debug level for this backend. Higher
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debug levels increase the verbosity of the output.
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Example:
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export SANE_DEBUG_TEST=4
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.SH "SEE ALSO"
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sane(7),
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.IR http://www.meier-geinitz.de/sane/test-backend/
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.SH AUTHOR
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Henning Meier-Geinitz <henning@meier-geinitz.de>
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.SH BUGS
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- config file values aren't tested for correctness
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