| slovo | definícia |
aliasing
(encz) | aliasing,schodovitost n: Zdeněk Brož |
aliasing
(foldoc) | aliasing
shadowing
1. When several different identifiers refer to the
same object. The term is very general and is used in many
contexts.
See alias, aliasing bug, anti-aliasing.
2. (Or "shadowing") Where a hardware device
responds at multiple addresses because it only decodes a
subset of the address lines, so different values on the
other lines are ignored.
(1998-03-13)
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| | podobné slovo | definícia |
antialiasing
(mass) | antialiasing
- vyhladzovanieanti-aliasing
- vyhladenie |
antialiasing
(encz) | antialiasing,vyhlazování hran [it.] Zbyněk Šťáva |
antialiasing
(wn) | antialiasing
n 1: (computer graphics) a technique that is used to smooth
jagged distortions in curves and diagonal lines so they
appear smoother |
aliasing bug
(foldoc) | stale pointer bug
aliasing bug
(Or "aliasing bug") A class of subtle
programming errors that can arise in code that does {dynamic
allocation}, especially via malloc or equivalent.
If several pointers address (are "aliases for") a given hunk
of storage, it may happen that the storage is freed or
reallocated (and thus moved) through one alias and then
referenced through another, which may lead to subtle (and
possibly intermittent) lossage depending on the state and the
allocation history of the malloc arena. This bug can be
avoided by never creating aliases for allocated memory, or by
use of a higher-level language, such as Lisp, which
employs a garbage collector.
The term "aliasing bug" is nowadays associated with C
programming, it was already in use in a very similar sense in
the ALGOL 60 and Fortran communities in the 1960s.
See also smash the stack, fandango on core, memory leak,
memory smash, spam.
[Jargon File]
(1995-05-09)
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anti-aliasing
(foldoc) | anti-aliasing
A technique used on a grey-scale or colour
bitmap display to make diagonal edges appear smoother by
setting pixels near the edge to intermediate colours
according to where the edge crosses them.
The most common example is black characters on a white
background. Without anti-aliasing, diagonal edges appear
jagged, like staircases, which may be noticeable on a low
resolution display. If the display can show intermediate
greys then anti-aliasing can be applied. A pixel will be
black if it is completely within the black area, or white if
it is completely outside the black area, or an intermediate
shade of grey according to the proportions of it which overlap
the black and white areas. The technique works similarly with
other foreground and background colours.
"Aliasing" refers to the fact that many points (which would
differ in the real image) are mapped or "aliased" to the same
pixel (with a single value) in the digital representation.
(1998-03-13)
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aliasing bug
(jargon) | aliasing bug
n.
A class of subtle programming errors that can arise in code that does
dynamic allocation, esp. via malloc(3) or equivalent. If several pointers
address (are aliases for) a given hunk of storage, it may happen that the
storage is freed or reallocated (and thus moved) through one alias and then
referenced through another, which may lead to subtle (and possibly
intermittent) lossage depending on the state and the allocation history of
the malloc arena. Avoidable by use of allocation strategies that never
alias allocated core, or by use of higher-level languages, such as LISP,
which employ a garbage collector (see GC). Also called a {stale pointer
bug}. See also precedence lossage, smash the stack, fandango on core,
memory leak, memory smash, overrun screw, spam.
Historical note: Though this term is nowadays associated with C
programming, it was already in use in a very similar sense in the Algol-60
and FORTRAN communities in the 1960s.
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