alist defines an association list. An association list is a sequence, containing zero or more repetitions of the given elements with each of the elements expressed as (type name).

angle defines an angle in units of radians and is bounded by (-2%pi;) and (2%pi;). Note that we are explicitly using a different angle representation than what is actually transmitted in the protocol.

arc-seq defines a six-tuple sequence of the form (x, y, width, height, angle1, angle2). The points x and y are signed, 16-bit quantities with a range from -32,768 to 32,767. The width and height values are unsigned, 16-bit quantities and range from 0 to 65,535. angle1 and angle2 are in units of radians, and bounded by (-2%pi;) and (2%pi;).

array-index defines a type which is a subtype of the integers and can be used to describe all variables that can be array indices. The range is inclusive because start and end array index specifiers can be one (1) past the end.

A keyword that specifies which region of a window should be retained when the window is resized.

gravity -- One of the following:

If a window is reconfigured without changing its inside width or height, then the contents of the window moves with the window and are not lost. Otherwise, the contents of a resized window are either moved or lost, depending on its bit-gravity attribute. See window-bit-gravity, in paragrpah 4.3, Window Attributes, for additional information.

Specifies a two-dimensional array of bits.

A structure that describes the storage format of a bitmap.

The bitmap-format structure contains slots for unit, pad, and lsb-first-p. The unit member indicates the unit of increments used to maintain the bitmap data. The units available for use are 8, 16, or 32 bits. The pad member indicates how many bits are needed to pad the left edge of the scan-line. The lsb-first-p member is a predicate which indicates the ordering of bits with the bitmap unit.

Type: (member 8 16 32).

The size of a contiguous grouping of bits, which can be 8, 16, or 32. The default is 8.

Type: (member 8 16 32).

The number of bits to left-pad the scan-line, which can be 8, 16, or 32. The default is 8.

Type: boolean.

A predicate indicating whether the least significant bit comes first (true) or not (nil).

boolean defines a type which is all inclusive. It is used for variables that can take on a true (non-nil) or false (nil) value.

boole-constant defines a type that is a set of the values associated with the 16 boolean operation-code constants for the Common Lisp language. It is used for the set of allowed source and destination combination functions in a graphics context.

value -- One of the following:

An unsigned integer value that is a maximum of eight bits long. This gives a number of this type a range from 0 to 255.

An unsigned integer value that is a maximum of 16 bits long. This gives a number of this type a range from 0 to 65,535.

An unsigned integer value that is a maximum of 29 bits long. This gives a number of this type a range from 0 to 536,870,911.

An unsigned integer value that is a maximum of 32 bits long. This gives a number of this type a range from 0 to 4,294,967,295.

A color. See paragrpah 9.2, Color Functions, for additional information.

A colormap. See paragrpah 9.3, Colormap Functions, for additional information.

A cursor. See section 10, Cursors, for additional information.

Provides a way to specify a set of bits for an event bitmask. Two ways of specifying the bits are allowed: by setting the event bits in a 32 bit mask, or by listing the keyword names of the device related event bits in a list.

A keyword name, for a device related event, that corresponds to a particular bit in an event bitmask. The set of names is a subset of the names in the type event-mask-class.

event -- One of the following:

A connection to an X server. See section 2, Displays, for additional information.

Both windows and pixmaps can be used as sources and destinations in graphics operations. windows and pixmaps together are known as drawables. However, an :input-only window cannot be used as a source or destination in a graphics operation.

Defines a list of rotation directions for drawing arcs and fonts. draw-direction can have the values of :left-to-right or :right-to-left.

Defines a list of all predefined errors. All errors (synchronous and asynchronous) are processed by calling an error handler in the display. The handler is called with the display as the first argument and the error-key as its second argument.

error -- One of the following:

Defines a list that specifies all predefined event-types. Clients are informed of information asynchronously by means of events. These events can be either asynchronously generated from devices or generated as side effects of client requests.

event-type -- One of the following:

Provides a way to specify a set of bits for an event bitmask. Two ways of specifying the bits are allowed: by setting the event bits in a 32 bit mask, or by listing the keyword names of the event bits in a list.

The elements of the type event-mask-class are keyword names that correspond to a particular bit in an event bitmask.

event -- One of the following:

event-mask

An event mask (type mask32).

Returns a list of event-mask-class keyword names for the event bits that are set in the specified event mask.

keys

event-mask-class keywords.

Constructs an event mask from a set of event-mask-class keyword names.

event-mask

Type mask32.

A text font. See section 8, Font and Characters, for additional information.

A fontable is either a font object or the name of one of the fonts in the font database.

A list that contains alternating keywords and integers.

A graphics context. See section 5, Graphics Contexts, for additional information.

A list of predefined types for use in gcontext processing. Various information for graphics output is stored in a graphics context (GC or GContext), such as foreground pixel, background pixel, line width, clipping region, and so forth.

type -- One of the following:

There are two kinds of grabs: active and passive. An active grab occurs when a single client grabs the keyboard and/or pointer explicitly. Clients can also grab a particular keyboard key or pointer button in a window. The grab activates when the key or button is actually pressed, and is called a passive grab. Passive grabs can be very convenient for implementing reliable pop-up menus.

grab-type -- One of the following:

Used in determining the depth of a pixmap, window, or image. The value specifies the number of bits deep that a given pixel has within a given pixmap, window, or image.

Used to control the element size of the destination buffer given to the translate function when drawing glyphs. If :default is specified, the size is based on the current font, if known; otherwise, 16 is used.

A signed integer value that is a maximum of eight bits long. A number of this type can have a range from -128 to 127.

A signed integer value that is a maximum of 16 bits long. A number of this type can have a range from -32,768 to 32,767.

A signed integer value that is a maximum of 32 bits long. A number of this type can have a range from -2,147,483,648 to 2,147,483,647.

Used as an encoding of a symbol on a keycap on a keyboard. It is an unsigned integer value represented in a maximum of 32 bits long. A keysym type can have a range from 0 to 4,294,967,295.

A positional bitmask that contains 16 boolean flags.

A positional bitmask that contains 32 boolean flags.

A keyword identifying one of the modifier keys on the keyboard device.

modifier -- One of the following:

A bitmask or list of keywords that specifies a set of modifier keys. The keyword :any is equivalent to any subset of modifier key.

Specifies a two-dimensional array of pixels.

An unsigned integer value that is a maximum of 32 bits long. This gives a pixel type a value range from 0 to 4,294,967,295. Useful values are dependent on the class of colormap being used.

A pixmap. See paragrpah 4.8, Pixmaps, for additional information.

A structure that describes the storage format of a pixmap.

The pixmap-format structure contains slots for depth, bits-per-pixel, and scanline-pad. The depth member indicates the number of bit planes in the pixmap. The bits-per-pixel member indicates the number of bits used to represent a single pixel. For X, a pixel can be 1, 4, 8, 16, 24, or 32 bits wide. As for bitmap-format, the scanline-pad member indicates how many pixels are needed to pad the left edge of the scan-line.

Type: image-depth.

The number of bit planes in the pixmap.

Type: (member 1 4 8 16 24 32).

The number of consecutive bits used to encode a single pixel. The default is 8.

Type: (member 8 16 32).

The number of bits to left-pad the scan-line, which can be 8, 16, or 32. The default is 8.

The point-seq type is used to define sequences of (x,y) pairs of points. The paired values are 16-bit, signed integer quantities. This gives the points in this type a range from -32,768 to 32,767.

Provides a way to specify a set of bits for an event bitmask. Two ways of specifying the bits are allowed: by setting the event bits in a 32 bit mask, or by listing the keyword names of the pointer related event bits in a list.

A keyword name, for a pointer related event, that corresponds to a particular bit in an event bitmask. The set of names is a subset of the names in the type event-mask-class.

event -- One of the following:

rect-seq defines a four-tuple sequence of the form (x, y, width, height). The points x and y are signed, 16-bit quantities with a range from -32,768 to 32,767. The width and height values are unsigned, 16-bit quantities and range from 0 to 65,535.

A subtype used to define repeating sequences.

A numeric identifier that is assigned by the server to a server resource object.

An rgb-val is a floating-point value between 0 and 1 that specifies a saturation for a red, green, or blue additive primary. The 0 value indicates no saturation and 1 indicates full saturation.

A display screen. See section 3, Screens, for further information.

Defines sequences of (x1, y1, x2, y2) sets of points. The point values are 16-bit, signed integer quantities. This gives the points in this type a range from -32,768 to 32,767.

A keyword identifying one of the display modifier keys or pointer buttons whose state is reported in device events.

button -- One of the following:

state-mask

A 16-bit mask of type mask16.

state-keywords

Type list.

keys

A list of state-mask-key symbols.

mask

Type mask16.

Type: card29.

A unique identification number.

Type: (member :direct-color :gray-scale :pseudo-color :static-color :static-gray :true-color).

The class of the visual type.

Type: pixel.

The red-mask, green-mask, and blue-mask elements are only meaningful for the :direct-color and :true-color classes. Each mask has one contiguous set of bits with no intersections.

Type: card8.

Specifies the log base 2 of the approximate number of distinct color values ( individually) of red, green, and blue. Actual RGB values are unsigned 16-bit numbers.

Type: card16.

Defines the number of available colormap entries in a newly created colormap. For :direct-color and :true-color, this is the size of an individual pixel subfield.

A keyword that specifies how to reposition a window when its parent is resized.

gravity -- One of the following:

If a parent window is reconfigured without changing its inside width or height, then all child windows move with the parent and are not changed. Otherwise, each child of the resized parent is moved, depending on the child's gravity attribute. See window-gravity, in paragrpah 4.3, Window Attributes, for additional information.