685 lines
15 KiB
Plaintext
685 lines
15 KiB
Plaintext
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XKM File Format Description
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Version 15
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1. Introduction
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The XKM file format is the exchange format for XKB keyboard descriptions
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between the server and xkbcomp. Usually, the server forks off xkbcomp,
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xkbcomp compiles the XKM format from the given parameters.
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The resulting XKM file is put into a directory readable by the server and
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then parsed.
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The XKM format is little more than a binary dump of various XKB-specific
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structures and hence tied to the ABI of the server.
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❧❧❧❧❧❧❧❧❧❧❧
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1.1 About this file format description
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This description was produced by analyzing the XKM parsing code. Parts of
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the file description present in the original format specification may be
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missing. This description thus cannot be a reference document for XKM
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implementations.
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No description of the meaning of the various fields is given here. Refer to
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the XKB protocol specification for more details.
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❧❧❧❧❧❧❧❧❧❧❧
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2. Notations used in this document
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Notation for structures:
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┌───
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Name of struct
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name of field: type or fixed value of field
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name of field: type or fixed value of field
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└───
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Data types are identical to those used in the X Protocol specification
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except where noted otherwise. Structs specific to XKM are prefixed with XKM,
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defines specific to the XKB protocol specification are prefixed with Xkb and
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their value is equivalent to that in the protocol specification.
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Multiple instances of a given type are denoted in the following form:
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name of field: LISTofFIELDTYPE
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Length specifiers for such fields are usually prefixed with num_. For
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example, a struct containing a num_foo of 8 and a 'foo' field contains 8
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structures of type 'foo'.
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Variable length padding is specified as pad(x), where x is the length of the
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data to be padded out to a multiple of 4 bytes. For example, given an x of
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10, pad(x) would be the remaining 2 bytes to pad the whole struct to 12
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bytes.
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A special notation is a variable content struct. In this case, the contents
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of the struct depend on the value of one or more specific fields.
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┌───
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Name of struct
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field: type or fixed value of field
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field: type or fixed value of field
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───
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field ⇒ value 1
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⇒
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specific field: type
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specific field: type
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───
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field ⇒ value 2
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⇒
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specific field: type
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specific field: type
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└───
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This notation denotes that if field is of value 1, this struct contains the
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specific fields listed underneath value 1.
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❧❧❧❧❧❧❧❧❧❧❧
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3. XKM Format
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The XKM format is a binary format with structs usually being padded to a
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multiple of 4 bytes. No provisions for endianess are provided, the parser is
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left to guess the endianess of the XKM file.
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❧❧❧❧❧❧❧❧❧❧❧
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3.1 Common data types
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┌───
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XKMCountedString
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count: CARD16
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string: count * CHAR
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pad: pad(count + 2)
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└───
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XKMCountedString is used for user-readable identifiers. Prime example are
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the level names and the section names ("complete", "evdev(inet)", etc.)
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┌───
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XKMGroupBits: CARD8
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group1 0x1
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group2 0x2
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group3 0x4
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group4 0x8
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└───
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❧❧❧❧❧❧❧❧❧❧❧
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3.2 Header and Table of Contents
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┌───
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XKMHeader
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version: CARD8
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identifier1: 'm'
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identifier2: 'k'
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idenfifier3: 'x'
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└───
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The XKM file format has a 4 byte header identifying the file and the XKM
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version. The header is followed by the table of contents indicating the
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sections present in this file.
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┌───
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XKMFileInfo
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type: CARD8
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min_keycode: CARD8
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max_keycode: CARD8
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num_sectioninfo: CARD8
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present: CARD16
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pad: CARD16
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sectioninfo: LISTofXKMSectionInfo
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└───
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min_keycode and max_keycode specify the keycode range for this keyboard
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descriptions. The core protocol requires min_keycode always be equal to or
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greater than 8.
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┌───
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XKMSectionInfo
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type: CARD16
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XkmTypesIndex 0
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XkmCompatMapIndex 1
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XkmSymbolsIndex 2
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XkmIndicatorsIndex 3
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XkmKeyNamesIndex 4
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XkmGeometryIndex 5
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XkmVirtualModsIndex 6
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format: CARD16
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size: CARD16
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offset: CARD16
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└───
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Describes the section found in a chunk of a file. This struct is found
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_twice_ in the file per section, once as part of the XKMFileInfo, once at
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the beginning of the actual section (see offset).
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The type specifies the type of the section, the section is to be parsed
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according to this type.
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Size and offset specify the size in bytes and the offset into the file in
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bytes, respectively.
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3.3 Sections
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Each section resides at the offset specified in the XKMFileInfo sectioninfo.
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❧❧❧❧❧❧❧❧❧❧❧
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3.3.1 XKMTypes
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An XKMTypes section describes the key types defined in a layout. Roughly
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speaking, a key type defines how many levels a given key has and which
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modifiers change to a particular level.
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┌───
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XKMTypesSection
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section_info: XKMSectionInfo
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name: XKMCountedString
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num_types: CARD16
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pad: CARD16
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types: LISTofXKMKeyType
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└───
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┌───
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XKMKeyType
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real_mods: CARD8
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num_levels: CARD8
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virt_mods: CARD16
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num_map_entries: CARD8
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num_level_names: CARD8
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perserve: CARD8
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pad: CARD8
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map_entries: LISTofXKMKTMapEntry
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name: XKMCountedString
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mods: LISTofXKMModsDesc
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level_names: LISXTofXKMCountedString
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└───
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The num_map_entries specifies the number of structs in both map_entries and mods. mods is only present if preserve is TRUE.
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┌───
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XKMKTMapEntry
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level: CARD8
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real_mods: CARD8
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virt_mods: CARD16
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└───
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┌───
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XKMModsDesc
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real_mods: CARD8
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pad: CARD8
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virt_mods: CARD16
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└───
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❧❧❧❧❧❧❧❧❧❧❧
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3.3.2 XKMCompatMap
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An XKMCompatMap section describes the actions a keyboard may trigger. This
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ranges from the TerminateServer action to simple modifier bits.
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┌───
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XKMCompatMap
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section_info: XKMSectionInfo
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name: XKMCountedString
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num_si: CARD16
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group_mask: XKMGroupBits
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pad: CARD8
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si: LISTofXKMSymInterpreterDesc
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groups: LISTofXKMModsDesc
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└───
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One XKMModsDesc is present for each bit set in group_mask.
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┌───
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XKMSymInterpretDesc
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sym: CARD32
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mods: CARD8
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match: CARD8
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virtual_mod: CARD8
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flags: CARD8
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action_type: CARD8
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action_data: XKMActionData
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└───
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Where the action is 7 bytes of CARD8 whose content is determined by
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action_type.
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┌───
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XKMActionData:
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pad0: CARD8
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pad1: CARD16
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pad2: CARD32
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───
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action_type ⇒ XkbSA_SetMods ||
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action_type ⇒ XkbSA_LatchMods ||
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action_type ⇒ XkbSA_LockMods
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⇒
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flags: CARD8
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mask: CARD8
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real_mods: CARD8
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vmods1: CARD8
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vmods2: CARD8
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pad: CARD16
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───
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action_type ⇒ XkbSA_SetGroup ||
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action_type ⇒ XkbSA_LatchGroup ||
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action_type ⇒ XkbSA_LockGroup
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⇒
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flags: CARD8
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group_XXX: CARD8
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pad0: CARD8
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pad1: CARD32
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───
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action_type ⇒ XkbSA_MovePtr
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⇒
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flags: CARD8
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high_XXX: CARD8
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low_XXX: CARD8
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high_YYY: CARD8
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low_YYY: CARD8
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pad: CARD16
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───
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action_type ⇒ XkbSA_PtrBtn ||
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action_type ⇒ XkbSA_LockPtrBtn
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⇒
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flags: CARD8
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count: CARD8
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button: CARD8
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pad: CARD32
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───
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action_type ⇒ XkbSA_DeviceBtn ||
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action_type ⇒ XkbSA_LockLockPtrBtn
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⇒
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flags: CARD8
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count: CARD8
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button: CARD8
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device: CARD8
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pad0: CARD8
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pad1: CARD16
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───
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action_type ⇒ XkbSA_SetPtrDflt
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⇒
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flags: CARD8
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affect: CARD8
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valueXXX: CARD8
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pad0: CARD32
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───
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action_type ⇒ XkbSA_ISOLock
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⇒
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flags: CARD8
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mask: CARD8
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real_mods: CARD8
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group_XXX: CARD8
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affect: CARD8
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vmods1: CARD8
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vmods1: CARD8
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───
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action_type ⇒ XkbSA_SwitchScreen
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⇒
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flags: CARD8
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screenXXX: CARD8
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pad0: CARD8
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pad1: CARD32
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───
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action_type ⇒ XkbSA_SetControls ||
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action_type ⇒ XkbSA_LockControls
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⇒
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flags: CARD8
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ctrls3: CARD8
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ctrls2: CARD8
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ctrls1: CARD8
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ctrls0: CARD8
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pad: CARD16
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───
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action_type ⇒ XkbSA_RedirectKey
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⇒
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new_key: CARD8
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mods_mask: CARD8
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mods: CARD8
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vmods_mask0: CARD8
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vmods_mask1: CARD8
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vmods0: CARD8
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vmods1: CARD8
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───
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action_type ⇒ XkbSA_DeviceValuator
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⇒
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device: CARD8
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v1_what: CARD8
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v1_idx: CARD8
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v1_value: CARD8
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v2_what: CARD8
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v2_idx: CARD8
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v2_value: CARD8
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pad: CARD8
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───
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action_type ⇒ XkbSA_XFree86Private ||
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action_type ⇒ XkbSA_Terminate
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⇒
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pad0: CARD8
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pad1: CARD16
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pad2: CARD32
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───
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action_type ⇒ XkbSA_ActionMessage
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⇒
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press_msg: BOOL
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release_msg: BOOL
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gen_event: BOOL
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message: 4 * CHAR
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└───
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Note: XkbSA_ActionMessage is currently unsupported and the contents are
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ignored.
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❧❧❧❧❧❧❧❧❧❧❧
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3.3.3 XkmSymbols
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|
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The symbols in a keymap define the actual keysyms each key may produce.
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┌───
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XKMSymbols
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section_info: XKMSectionInfo
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name: XKMCountedString
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min_keycode: CARD8
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max_keycode: CARD8
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group_names_mask: XKMGroupBits
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num_vmod_maps: CARD8
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group_names: LISTofXKMCountedString
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keysyms: XKMKeysymMapDesc
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vmod_maps: XKMVModMapDesc
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└───
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One group_name is present for each bit set in group_names_mask.
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The number of keysyms present is max_keycode - min_keycode + 1.
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┌───
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|
|
XKMKeysymMapDesc
|
||
|
|
width: CARD8
|
||
|
|
num_groups: CARD8
|
||
|
|
modifier_map: CARD8
|
||
|
|
flags: CARD8
|
||
|
|
names: LISTofXKMCountedString
|
||
|
|
syms: LISTofCARD32
|
||
|
|
behavior: XKMBehaviorDesc
|
||
|
|
└───
|
||
|
|
|
||
|
|
Presence of names is conditional on the XkmKeyHasTypes flag. The number of
|
||
|
|
strings is equal to the number of group bits in group_names_mask in the
|
||
|
|
preceeding XKMSymbols section.
|
||
|
|
The number of elements in syms is equal to width * num_groups.
|
||
|
|
Presence of behavior is conditional on the XkmKeyHasBehavior flag.
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMKeyBehaviorDesc
|
||
|
|
type: CARD8
|
||
|
|
data: CARD8
|
||
|
|
pad: CARD16
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMVModMapDesc
|
||
|
|
key: CARD8
|
||
|
|
pad: CARD8
|
||
|
|
vmods: CARD16
|
||
|
|
└───
|
||
|
|
|
||
|
|
❧❧❧❧❧❧❧❧❧❧❧
|
||
|
|
|
||
|
|
3.3.4 XKMIndicators
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMIndicators
|
||
|
|
section_info: XKMSectionInfo
|
||
|
|
name: XKMCountedString
|
||
|
|
num_indicators: CARD8
|
||
|
|
pad0: CARD8
|
||
|
|
pad1: CARD16
|
||
|
|
indicators: LISTofXKMIndicatorMapDesc
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMIndicatorMapDesc
|
||
|
|
name: XKMCountedString
|
||
|
|
indicator: CARD8
|
||
|
|
flags: CARD8
|
||
|
|
which_mods: CARD8
|
||
|
|
real_mods: CARD8
|
||
|
|
vmods: CARD16
|
||
|
|
which_groups: CARD8
|
||
|
|
groups: CARD8
|
||
|
|
ctrls: CARD32
|
||
|
|
└───
|
||
|
|
❧❧❧❧❧❧❧❧❧❧❧
|
||
|
|
|
||
|
|
3.3.5 XKMKeyNames
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMKeyNames
|
||
|
|
section_info: XKMSectionInfo
|
||
|
|
name: XKMCountedString
|
||
|
|
min_keycode: CARD8
|
||
|
|
max_keycode: CARD8
|
||
|
|
num_aliases: CARD8
|
||
|
|
pad: CARD8
|
||
|
|
keynames: LISTofXKMKeyname
|
||
|
|
aliases: LISTofXKMKeyAlias
|
||
|
|
└───
|
||
|
|
|
||
|
|
keynames contains max_keycode - min_keycode + 1 entries.
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XkmKeyname
|
||
|
|
name: 4 * CHAR8
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XkmKeyAlias
|
||
|
|
real: XkmKeyname
|
||
|
|
alias: XkmKeyname
|
||
|
|
└───
|
||
|
|
|
||
|
|
❧❧❧❧❧❧❧❧❧❧❧
|
||
|
|
|
||
|
|
3.3.5 XKMGeometry
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMGeometry
|
||
|
|
section_info: XKMSectionInfo
|
||
|
|
name: XKMCountedString
|
||
|
|
width_mm: CARD16
|
||
|
|
height_mm: CARD16
|
||
|
|
base_color_ndx: CARD8
|
||
|
|
label_color_ndx: CARD8
|
||
|
|
num_properties: CARD16
|
||
|
|
num_colors: CARD16
|
||
|
|
num_shapes: CARD16
|
||
|
|
num_sections: CARD16
|
||
|
|
num_doodads: CARD16
|
||
|
|
num_key_aliases: CARD16
|
||
|
|
pad: CARD16
|
||
|
|
label_font: XKMCountedString
|
||
|
|
properties: LISTofXKMGeomProperty
|
||
|
|
colors: LISTofXKMCountedString
|
||
|
|
shapes: LISTofXKMGeomShape
|
||
|
|
sections: LISTofXKMGeomSection
|
||
|
|
doodads: LISTofXKMGeomDoodad
|
||
|
|
key_aliases: LISTofXKMKeyAlias
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMGeomProperty
|
||
|
|
name: XKMCountedString
|
||
|
|
value: XKMCountedString
|
||
|
|
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMGeomShape
|
||
|
|
name: XKMCountedString
|
||
|
|
num_outlines: CARD8
|
||
|
|
primary_idx: CARD8
|
||
|
|
approx_idx: CARD8
|
||
|
|
pad: CARD8
|
||
|
|
outlines: LISTofXKMOutlineDesc
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMOutlineDesc
|
||
|
|
num_points: CARD8
|
||
|
|
corner_radius: CARD8
|
||
|
|
pad: CARD16
|
||
|
|
points: LISTofXKMPointDesc
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMPointDesc
|
||
|
|
x: INT16
|
||
|
|
y: INT16
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMGeomSection
|
||
|
|
name: XKMCountedString
|
||
|
|
top: INT16
|
||
|
|
left: INT16
|
||
|
|
width: CARD16
|
||
|
|
height: CARD16
|
||
|
|
angle: INT16
|
||
|
|
priority: CARD8
|
||
|
|
num_rows: CARD8
|
||
|
|
num_doodads: CARD8
|
||
|
|
num_overlays: CARD8
|
||
|
|
pad: CARD16
|
||
|
|
rows: LISTofXKMRowDesc
|
||
|
|
doodads: LISTofXKMGeomDoodad
|
||
|
|
overlays: LISTofXKMGeomOverlay
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMRowDesc
|
||
|
|
top: INT16
|
||
|
|
left: INT16
|
||
|
|
num_keys: CARD8
|
||
|
|
vertical: BOOL
|
||
|
|
pad: CARD16
|
||
|
|
keys: XKMKeyDesc
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMKeyDesc
|
||
|
|
name: XKMKeyname
|
||
|
|
gap: INT16
|
||
|
|
shape_idx: CARD8
|
||
|
|
color_idx: CARD8
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMGeomDoodad
|
||
|
|
name: XKMCountedString
|
||
|
|
type: CARD8
|
||
|
|
priority: CARD8
|
||
|
|
top: INT16
|
||
|
|
left: INT16
|
||
|
|
pad1: CARD16
|
||
|
|
pad2: CARD32
|
||
|
|
pad3: CARD32
|
||
|
|
───
|
||
|
|
type ⇒ XkbOutlineDoodad ||
|
||
|
|
type ⇒ XkbSolideDoodad
|
||
|
|
⇒
|
||
|
|
type: CARD8
|
||
|
|
priority: CARD8
|
||
|
|
top: INT16
|
||
|
|
left: INT16
|
||
|
|
angle: INT16
|
||
|
|
color_idx: CARD8
|
||
|
|
shape_idx: CARD8
|
||
|
|
pad0: CARD16
|
||
|
|
pad1: CARD32
|
||
|
|
───
|
||
|
|
type ⇒ XkbTextDoodad
|
||
|
|
⇒
|
||
|
|
type: CARD8
|
||
|
|
priority: CARD8
|
||
|
|
top: INT16
|
||
|
|
left: INT16
|
||
|
|
angle: INT16
|
||
|
|
width: CARD16
|
||
|
|
height: CARD16
|
||
|
|
color_idx: CARD8
|
||
|
|
pad0: CARD8
|
||
|
|
pad1: CARD16
|
||
|
|
text: XKMCountedString
|
||
|
|
font: XKMCountedString
|
||
|
|
───
|
||
|
|
type ⇒ XkbIndicatorDoodad
|
||
|
|
⇒
|
||
|
|
type: CARD8
|
||
|
|
priority: CARD8
|
||
|
|
top: INT16
|
||
|
|
left: INT16
|
||
|
|
shape_idx: CARD8
|
||
|
|
on_color_idx: CARD8
|
||
|
|
off_color_idx: CARD8
|
||
|
|
pad0: CARD8
|
||
|
|
pad1: CARD16
|
||
|
|
pad2: CARD32
|
||
|
|
───
|
||
|
|
type ⇒ XkbLogoDoodad
|
||
|
|
⇒
|
||
|
|
type: CARD8
|
||
|
|
priority: CARD8
|
||
|
|
top: INT16
|
||
|
|
left: INT16
|
||
|
|
angle: INT16
|
||
|
|
color_idx: CARD8
|
||
|
|
shape_idx: CARD8
|
||
|
|
pad0: CARD16
|
||
|
|
pad1: CARD32
|
||
|
|
logo_name: XKMCountedString
|
||
|
|
└───
|
||
|
|
|
||
|
|
WARNING: XKMGeomDoodad has variable length depending on the type.
|
||
|
|
NOTE: The current server implementation does not use all fields of all
|
||
|
|
structures.
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMOverlayDesc
|
||
|
|
name: XKMCountedString
|
||
|
|
num_rows: CARD8
|
||
|
|
pad0: CARD8
|
||
|
|
pad1: CARD16
|
||
|
|
rows: LISTofXKMOverlayRowDesc
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMOverlayRowDesc
|
||
|
|
name: XKMCountedString
|
||
|
|
row_under: CARD8
|
||
|
|
num_keys: CARD8
|
||
|
|
pad: CARD16
|
||
|
|
keys: LISTofXKMOverlayKeyDesc
|
||
|
|
└───
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMOverlayKeyDesc
|
||
|
|
over: XKMKeyname
|
||
|
|
under: XKMKeyname
|
||
|
|
└───
|
||
|
|
|
||
|
|
❧❧❧❧❧❧❧❧❧❧❧
|
||
|
|
|
||
|
|
3.3.6 XKMVirtualMods
|
||
|
|
|
||
|
|
┌───
|
||
|
|
XKMOverlayRowDesc
|
||
|
|
section_info: XKMSectionInfo
|
||
|
|
name: XKMCountedString
|
||
|
|
bound_mask: SETofVMODBITS
|
||
|
|
named_mask: SETofVMODBITS
|
||
|
|
vmods: LISTofCARD8
|
||
|
|
pad: pad(vmods)
|
||
|
|
names: LISTofXKMCountedString
|
||
|
|
└───
|
||
|
|
|
||
|
|
VMODBITS: CARD16
|
||
|
|
|
||
|
|
Number of elements in vmods is equal to the number of bits set in
|
||
|
|
bound_mask. The padding completes vmods to a multiple of 4 byte units.
|
||
|
|
Number of elements in names is equal to the number of bits set in
|
||
|
|
named_mask.
|