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 Mask (computing) - Wikipedia, the free encyclopedia In computer science, a mask is some data that, along with an operation, are used in order to extract information stored elsewhere. The most common mask used, also known as a bitmask, extracts the status of certain bits in a binary string or number. For example, if we have the binary string 100111010 and we want to extract the status of the fifth bit counting along from the most significant bit, we would use a bitmask such as 000010000 and use the bitwise AND operator. en.wikipedia.org /wiki/Bitmask   (264 words)

 The BitMask datatype.   (Site not responding. Last check: 2007-10-29) BitMask value = 13 # As a decimal number. BitMask value = 0b1101 # As a binary number. BitMask value = b0 + b2 + b3 # As bits. www.astro.caltech.edu /~mcs/CBI/cbiscript/BitMask.html   (96 words)

 [No title] As with bitmasks, a triage mask subdivides a given region into a regular 8x8 grid. The triage mask consists of 3 8x8 bitmasks: The 'C' mask - denotes subregions that are completely covered by a polygon The 'V' mask - denotes subregions that are completely disjoint from a polygon The 'A' mask - denotes subregions that are partially covered by a polygon. First, triage masks for the edges are constructed (we use the same 512-interval perimeter discretization as the Bitmask class), then the edge masks are combined, this time using the + or += operators. www.dgp.toronto.edu /~jrmeredi/RenderDude/Source/TriageMask.h   (463 words)

 Chapter 18 Access Control Lists   (Site not responding. Last check: 2007-10-29) Address bitmasks are similar to a subnet mask, containing four integers from 0 to 255, each separated by a period. The binary mask uses 1 bits to indicate "match" and 0 bits to indicate "ignore." The bitmask is bitwise ANDed with the specified source IP address, and then compared with the address for each IP packet entering the port(s) to which this ACL has been assigned. The control bitmask is a decimal number (for an equivalent binary bit mask) that is applied to the control code. www.foundrynet.com /services/documentation/EIUserProj/b18_ACLs.html   (3113 words)

 [No title] But to be scalable, we need something else; the bitmasks need to be dynamically and automatically adjustable, so that as more blocks are added to a server with a given bitmask, it lengthens its bitmask as it starts running out of space in its blockstore. I propose that metatrackers be given a bitmask just as blockservers are and that metatrackers advertise their bitmasks the same way that blockservers do, which is to say by publishing them on the metatrackers. That partitions the blockspace into one million bitmasks, each of which will be contain as much data as a single average blockserver can hold (although it will be replicated onto as many blockservers as there are within a single bitmask). web.mit.edu /arma/Public/mn2   (4702 words)

 Sprites algorithm   (Site not responding. Last check: 2007-10-29) The bits in the bitmask are 0 for pixels where collisions must not occur (i.e. Basically, you "superimpose" the two bitmasks over one another, and test if a "1" occurs in the same place on both bitmasks - this means a collision. For each sprite of dimension (m, n) pixels, you create a bitmask of size (m/8, n) bytes, where each bit in the bitmask typically corresponds to 0 for transparent pixels in the sprite and 1 for opaque pixels in the sprite. www.scorpioncity.com /dg_sprites.html   (1095 words)

 14.11.2 Mixer Device Objects Returns a bitmask specifying the mixer controls that may be used to record. Note that this may not be exactly the same as the volume specified, because of the limited resolution of some soundcard's mixers. This method returns a bitmask indicating which channel or channels are currently being used as a recording source. www.lassp.cornell.edu /sethna/DM/Documentation/Python/lib/mixer-device-objects.html   (317 words)

 An Efficient Scheme for Query Processing on Peer-to-Peer Networks The maximum size of the bitmask will remain fixed, but the size of the uplinked data may be larger because of the loss of coding/compression efficiency. The introduction of hash-based bitmasks allows a signature of each node's data to be propagated up the network tree where it can be used determine whether or not that node should receive a given query. The implementation of CQR requires the selection of a universal hashing scheme, the handshake protocol to facilitate the uplink of the resulting bitmask, a sane keep-alive schedule for the updating/deletion of the bitmask, and an appropriate encoding scheme to reduce uplink data requirements. aeolusres.homestead.com /files   (5114 words)

 Linux Valley - ENCYCLOPEDIA When bind(2) is called on the socket, the nl_groups field in the sockaddr_nl should be set to a bitmask of the groups which it wishes to listen to. A socket may multicast messages to any of the multicast groups by setting nl_groups to a bitmask of the groups it wishes to send to when it calls sendmsg(2) or does a connect(2). nl_groups is a bitmask with every bit representing a netlink group number. www.linuxvalley.it /encyclopedia/ldp/manpage/man7/netlink.7.php   (921 words)

 ZStyleGroup OLE DB driver - Supported Properties   (Site not responding. Last check: 2007-10-29) A bitmask defining the valid clauses for the definition of a column. A bitmask specifying the ways in which the provider supports access to BLOBs and COM objects stored in columns. A bitmask specifying whether the notification phase is cancelable. www.zstyle.dp.ua /eng/iboledb_doc3.htm   (1190 words)

 SQLGetInfo An SQLUINTEGER bitmask enumerating the numeric value scalar functions that are supported by the driver and the associated data source, as defined in SQL-92. An SQLUINTEGER bitmask enumerating the string scalar functions that are supported by the driver and the associated data source, as defined in SQL-92. The bitmask for each option is used in conjunction with the flag to determine whether the option is supported. www.vieka.com /esqldoc/esqlref/htm/odbcsqlgetinfo.htm   (12763 words)

 Tutorial #4 — Simple Display and Programming Techniques   (Site not responding. Last check: 2007-10-29) The bitmask has only one bit that is set, since you are displaying only one pixel. The bitmask is used in conjunction with the byte to modify the display. The bitmask only has one bit set, for example: %01000000 which is the second bit. ti86.acz.org /coding/z80ti864.htm   (2344 words)

 The Old Joel on Software Forum - Use of Bitmask appropriate in DB? I chose the Bitmask because it prevents the size of the Access file from growing when appointments are rescheduled. The problem with a bitmask is that what each bit means is somewhere else (it's not in the data). I just implemented two bitmask fields in a table as the simplest way I could think of to track 1) which facilities of three will be charged, and 2) which departments of 14 will be charged. discuss.fogcreek.com /joelonsoftware?cmd=show&ixPost=110671   (2615 words)

 2d Collision Detection   (Site not responding. Last check: 2007-10-29) The code is copyright (c) 2001-2004 Ulf EkstrĂ¶m, and is released under the LGPL licence. This is the data structure holding the bitmask. The general way to create a bitmask for a given sprite image is to examine each pixel in the image and use www.ifm.liu.se /~ulfek/projects/2d_Collision_Detection.html   (321 words)

 MSI Programmer's Guide for UNIX: ms_setevtmsk( )   (Site not responding. Last check: 2007-10-29) The bitmask determines which transitions will cause an event to be generated. The current bitmask can be examined by using the ms_getevtmsk( ) function. The event to be enabled by setting the bitmask for that event. resource.intel.com /telecom/support/documentation/unix/rel2_openserver/htmlfiles/msi/0362-03-53.html   (281 words)

 pfm_get_impl_pmcs.3 man page They all return a bitmask of registers corresponding to the query. The pfm_get_impl_counters returns in impl_counters a bitmask of the PMD/PMC pairs which can be used as counters. The counters are used to accumulate the number of occurrences of events and are typically the one used by monitoring tools. www.hpl.hp.com /research/linux/perfmon/libpfm3-man3/pfm_get_impl_pmcs.3.php4   (429 words)

 Tekkotsu: ERS220Info Namespace Reference Bitmasks for use when specifying combinations of LEDs (see LedEngine) Note that left/right are robot's point of view So you can be clear when you're refering to a LED bitmask. Right now all binary joints are slow, but perhaps this won't always be the case... ugweb.cs.ualberta.ca /~c412/tekkotsu/namespaceERS220Info.html   (1717 words)

 [No title] A particular bitmask specifies a particular > blockspace that is a subset of the entire blockspace; the size of the > bitmask determines the size of its blockspace. One first bitmask (the one that pubblicize the blocks the blockstore will accept to store from publishers) and a dinamiccaly varialble bitmask create to fit to the blocks that not fit in the first. This will be useful when resizing the first bitmask and we will not that all the blocks that don't fit the new (first) bitmask are dropped. web.mit.edu /arma/Public/mn4   (1379 words)

 WeberDev.com : Use of bitmasks to represent permissions   (Site not responding. Last check: 2007-10-29) *When using the bitwise AND(&) all bits that are set in both \$bitMask and the *return value of pow(2(\$i) are set to 1. *The bitmask of 5 would be passed into the function *so \$bitmask is set to 5 or in binary(00000101). To use you would want to set the fields in \$permissions to true for the permissions you want to grant. www.weberdev.com /PrintExample.php?count=3809&mode=color   (756 words)

 RXTE Cook Book: BITMASKS For your convenience, we provide sets of common bitmasks for almost all of the PCA event modes**. You should check carefully that you are using the correct bitmask for your data configuration; often, the tools will be perfectly happy to operate with a bitmask which is not what you intended. If the bitmask you need has an asterisk next to it, then the data will have to be filtered with fselect before extraction as explained in the selection recipe. heasarc.gsfc.nasa.gov /docs/xte/recipes/bitmasks.html   (429 words)

 TUsbcEndpointCaps in USB client The packet size to be converted to a bitmask. The bitmask can have any of the values listed in USB endpoint packet size constants. The bitmask can have any of the values listed in USB endpoint type and direction constants. www.symbian.com /developer/techlib/v70sdocs/doc_source/reference/cpp/USBClient/TUsbcEndpointCapsClass.html   (164 words)

 What is a bitmask?   (Site not responding. Last check: 2007-10-29) A bitmask is, to be blunt, an integer (usually an int or a long int). Integers used as bitmasks are typically used with a bitwise operator, such as & (AND), Depending on the operator, the bits in the bitmask are chosen to be 0 or 1 according to this table: & (AND): 0 means "clear this bit", 1 means "leave this bit as it is". www.codecomments.com /message154338.html   (552 words)

 RksCfgSrc::PreProcessLineComments An escape state bitmask is set to FALSE in its entirety. The escape state bitmask is shifted left 1 bit. If the quotation state variable is TRUE, or if bit 1 of the escape state bitmask is TRUE, then the remaining actions are skipped and execution continues with the next enumerated character. www.grc.nasa.gov /WWW/price000/rsa/hts/rkscfgsrc_preprocesslinecomments.html   (335 words)

 ON PERFORMANCE CONSIDERATIONS CONTAMINATING LOGICAL DESIGN In addition, it is argued that using this bitmask field would not slow down insert/update performance or introduce the possibility of inaccurate data, because if I needed to change the rights a user had, all I would need to do is perform an addition or subtraction operation on that one single field. The bitmask column of the users table for a user who had these 2 rights would be 12. The bit field for record 1 would be 1, record 2 would be 2, record 10 would be 512, etc., and with only 30 or so records, you would end up with bit values that might be too large for the column's data type. www.dbdebunk.com /page/page/622161.htm   (1898 words)

 adam machanic :: data manipulation for fun and profit : Bitmask Handling, part 4: Left-shift and right-shift Left-shift and right-shift are integral to binary mathematical operations as they have two important qualities: Left-shifting a bitmask once multiplies by two. Remember that 0011 (base 2) is 3 (base 10) or 0x0003 (base 16), and has bits 1 and 2 turned on. But that's not an issue, because the bitmask re-constitution pattern uses the bitmaskNumbers table, which conveniently doesn't contain a 0. sqljunkies.com /WebLog/amachanic/archive/2005/02/10/7651.aspx   (386 words)

 Bitmask Collision Detection Library The Bitmask library provides C functions for 2D pixel-perfect collision detection. In addition to just collision detection the library can also calculate a point of intersection and the number of overlapping pixels in an efficient way. The Bitmask library was written by Ulf Ekström 2001-2005. www.ifm.liu.se /~ulfek/bitmask   (615 words)

 Programming   (Site not responding. Last check: 2007-10-29) I knew what a bitmask was, but generally regarded them as voodoo magic left to crazy C hackers. If the result is 0 (zero) then the single bitmask value is not present in the sum of the bitmask. If you don't understand bitmasks and permissions you're going to spend days figuring out why you can't write and read files and when you DO figure out how to manipulate permissions you'll most likely just chmod 777 because it works without any regards to security. www.joestump.net /archives/487451368/programming.html   (2223 words)

 [No title]   (Site not responding. Last check: 2007-10-29) KPA for Highway mode Fuel mode (Disable af) */ { /*startAddr =480, /*columns =1, /*rows =1, /*elementSize =1, /*bitMask =0, /*offset =0, /*mulOrDivOrBit =0, /*factor =0.92308, /*map_name =Highway mode Fuel max. RPM */ { /*startAddr =20A, /*columns =1, /*rows =1, /*elementSize =1, /*bitMask =0, /*offset =0, /*mulOrDivOrBit =0, /*factor =12.5, /*map_name =Knock rtd min. MPH */ { /*startAddr =20B, /*columns =1, /*rows =1, /*elementSize =1, /*bitMask =0, /*offset =0, /*mulOrDivOrBit =0, /*factor =1, /*map_name =Knock rtd min. pweb.uunet.de /pr-meyer.h/binaries/CM7730.ECU   (850 words)

 Warning during GC, resulting in to Magic Bitmask Error for JFFS2.   (Site not responding. Last check: 2007-10-29) Warning during GC, resulting in to Magic Bitmask Error for JFFS2. Previous message: Warning during GC, resulting in to Magic Bitmask Error for JFFS2. Next message: Warning during GC, resulting in to Magic Bitmask Error for JFFS2. lists.infradead.org /pipermail/linux-mtd/2005-May/012555.html   (292 words)

 Koders - miams-libraries-segmented-arrays.adb procedure Delete(Item : in out Node_Ptr; Data : in Element; Bitmask : in Index; Depth : in Depth_Index) is -- This recursive decent procedure deletes all the childern -- of Item and then Item. Ptr, Data, Bitmask, Depth); Item := (Kind => Value, Data => Data); end if; -- exception -- when others => -- Put_Line ("In Write."); -- raise; end Write; pragma Inline(Write); procedure Expand(From : in out Node_Value) is -- Guaruntees that From is a pointer to a node containing childern. Child(Choice)); -- Depth and Bitmask must go down the tree if T_Flag then Decend(Mask => C_Bitmask, Depth => C_Depth, Child => Choice); else T_Flag := True; -- This is to properly stagger the depth. www.koders.com /ada/fid65B9211A4079D121128F2F79174B987161CC7BCE.aspx   (1315 words)

 Bitmask Solutions: Home   (Site not responding. Last check: 2007-10-29) Bitmask Solutions is committed to establishing itself as a leading provider of practical advice and solutions in information technology to home, small, and medium businesses in the Greater Vancouver area. Bitmask Solutions is a Vancouver-based information technology consulting organization committed to providing home, small, and medium businesses with the right technological solutions to the right problems. Bitmask Solutions is an end-to-end solution provider for home, small, and medium business. www.bitmasksolutions.com   (298 words)

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