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Add QEMU Extended Key Event for layout-independent input
This commit is contained in:
Viktor Liu
272
client/vnc/server/scancodes.go
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272
client/vnc/server/scancodes.go
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package server
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// QEMU Extended Key Event carries hardware scancodes encoded as PC AT Set 1.
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// Single-byte codes cover the standard keys; the "extended" prefix 0xE0 is
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// merged into the high byte (so 0xE048 is the extended-Up arrow). This file
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// translates those scancodes into the per-platform identifiers each input
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// backend wants:
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//
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// - Linux uinput wants Linux KEY_* codes (defined in
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// linux/input-event-codes.h). uinput is what we use for virtual Xvfb
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// sessions on Linux.
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// - X11 XTest wants XKB keycodes, which on a standard layout equal
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// Linux KEY_* + 8 (the per-server offset between the Linux event code
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// and the X server's keycode space).
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// - Windows SendInput accepts the PC AT scancode directly via
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// KEYEVENTF_SCANCODE, so no mapping table is needed there; the
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// extended-key bit is set when the QEMU scancode high byte is 0xE0.
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// - macOS CGEventCreateKeyboardEvent takes a "virtual keycode" from
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// Apple's HID set, which is unrelated to PC AT and needs its own
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// table (see qemuToMacVK in input_darwin.go).
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//
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// Linux KEY_* codes. Only the ones we reference, since the full
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// linux/input-event-codes.h list isn't useful here. Naming mirrors the
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// existing constants in input_uinput_unix.go (mixed case, no underscores).
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const (
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keyEsc = 1
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key1 = 2
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key2 = 3
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key3 = 4
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key4 = 5
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key5 = 6
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key6 = 7
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key7 = 8
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key8 = 9
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key9 = 10
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key0 = 11
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keyMinus = 12
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keyEqual = 13
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keyBackspace = 14
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keyTab = 15
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keyQ = 16
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keyW = 17
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keyE = 18
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keyR = 19
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keyT = 20
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keyY = 21
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keyU = 22
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keyI = 23
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keyO = 24
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keyP = 25
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keyLeftBracket = 26
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keyRightBracket = 27
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keyEnter = 28
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keyLeftCtrl = 29
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keyA = 30
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keyS = 31
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keyD = 32
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keyF = 33
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keyG = 34
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keyH = 35
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keyJ = 36
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keyK = 37
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keyL = 38
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keySemicolon = 39
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keyApostrophe = 40
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keyGrave = 41
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keyLeftShift = 42
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keyBackslash = 43
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keyZ = 44
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keyX = 45
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keyC = 46
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keyV = 47
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keyB = 48
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keyN = 49
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keyM = 50
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keyComma = 51
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keyDot = 52
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keySlash = 53
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keyRightShift = 54
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keyKPAsterisk = 55
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keyLeftAlt = 56
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keySpace = 57
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keyCapsLock = 58
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keyF1 = 59
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keyF2 = 60
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keyF3 = 61
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keyF4 = 62
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keyF5 = 63
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keyF6 = 64
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keyF7 = 65
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keyF8 = 66
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keyF9 = 67
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keyF10 = 68
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keyNumLock = 69
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keyScrollLock = 70
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keyKP7 = 71
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keyKP8 = 72
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keyKP9 = 73
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keyKPMinus = 74
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keyKP4 = 75
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keyKP5 = 76
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keyKP6 = 77
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keyKPPlus = 78
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keyKP1 = 79
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keyKP2 = 80
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keyKP3 = 81
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keyKP0 = 82
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keyKPDot = 83
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key102nd = 86
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keyF11 = 87
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keyF12 = 88
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keyKPEnter = 96
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keyRightCtrl = 97
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keyKPSlash = 98
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keySysRq = 99
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keyRightAlt = 100
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keyHome = 102
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keyUp = 103
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keyPageUp = 104
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keyLeft = 105
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keyRight = 106
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keyEnd = 107
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keyDown = 108
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keyPageDown = 109
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keyInsert = 110
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keyDelete = 111
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keyMute = 113
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keyVolumeDown = 114
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keyVolumeUp = 115
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keyLeftMeta = 125
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keyRightMeta = 126
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keyCompose = 127
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)
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// qemuToLinuxKey maps the PC AT Set 1 scancode QEMU sends to a Linux KEY_*
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// code. The high byte 0xE0 marks "extended" scancodes (arrows, the right-
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// side modifier keys, keypad enter/divide, browser keys, etc.).
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//
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// Keep this table dense so a reviewer sees the whole keyboard at a glance,
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// and so adding a new key is a single line.
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var qemuToLinuxKey = map[uint32]int{
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// Single-byte (non-extended) scancodes.
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0x01: keyEsc,
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0x02: key1,
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0x03: key2,
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0x04: key3,
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0x05: key4,
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0x06: key5,
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0x07: key6,
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0x08: key7,
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0x09: key8,
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0x0A: key9,
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0x0B: key0,
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0x0C: keyMinus,
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0x0D: keyEqual,
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0x0E: keyBackspace,
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0x0F: keyTab,
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0x10: keyQ,
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0x11: keyW,
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0x12: keyE,
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0x13: keyR,
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0x14: keyT,
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0x15: keyY,
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0x16: keyU,
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0x17: keyI,
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0x18: keyO,
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0x19: keyP,
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0x1A: keyLeftBracket,
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0x1B: keyRightBracket,
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0x1C: keyEnter,
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0x1D: keyLeftCtrl,
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0x1E: keyA,
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0x1F: keyS,
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0x20: keyD,
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0x21: keyF,
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0x22: keyG,
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0x23: keyH,
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0x24: keyJ,
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0x25: keyK,
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0x26: keyL,
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0x27: keySemicolon,
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0x28: keyApostrophe,
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0x29: keyGrave,
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0x2A: keyLeftShift,
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0x2B: keyBackslash,
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0x2C: keyZ,
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0x2D: keyX,
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0x2E: keyC,
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0x2F: keyV,
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0x30: keyB,
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0x31: keyN,
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0x32: keyM,
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0x33: keyComma,
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0x34: keyDot,
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0x35: keySlash,
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0x36: keyRightShift,
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0x37: keyKPAsterisk,
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0x38: keyLeftAlt,
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0x39: keySpace,
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0x3A: keyCapsLock,
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0x3B: keyF1,
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0x3C: keyF2,
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0x3D: keyF3,
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0x3E: keyF4,
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0x3F: keyF5,
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0x40: keyF6,
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0x41: keyF7,
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0x42: keyF8,
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0x43: keyF9,
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0x44: keyF10,
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0x45: keyNumLock,
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0x46: keyScrollLock,
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0x47: keyKP7,
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0x48: keyKP8,
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0x49: keyKP9,
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0x4A: keyKPMinus,
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0x4B: keyKP4,
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0x4C: keyKP5,
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0x4D: keyKP6,
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0x4E: keyKPPlus,
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0x4F: keyKP1,
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0x50: keyKP2,
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0x51: keyKP3,
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0x52: keyKP0,
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0x53: keyKPDot,
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0x56: key102nd,
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0x57: keyF11,
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0x58: keyF12,
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// Extended (0xE0-prefixed) scancodes.
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0xE01C: keyKPEnter,
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0xE01D: keyRightCtrl,
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0xE020: keyMute,
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0xE02E: keyVolumeDown,
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0xE030: keyVolumeUp,
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0xE035: keyKPSlash,
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0xE037: keySysRq, // PrintScreen
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0xE038: keyRightAlt,
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0xE047: keyHome,
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0xE048: keyUp,
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0xE049: keyPageUp,
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0xE04B: keyLeft,
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0xE04D: keyRight,
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0xE04F: keyEnd,
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0xE050: keyDown,
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0xE051: keyPageDown,
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0xE052: keyInsert,
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0xE053: keyDelete,
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0xE05B: keyLeftMeta,
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0xE05C: keyRightMeta,
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0xE05D: keyCompose,
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}
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// qemuScancodeToLinuxKey is the lookup the uinput and X11 paths use.
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// Returns 0 (which Linux treats as KEY_RESERVED) when the scancode has no
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// mapping, signalling "fall back to the keysym path".
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func qemuScancodeToLinuxKey(scancode uint32) int {
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return qemuToLinuxKey[scancode]
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}
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// qemuScancodeIsExtended reports whether a QEMU scancode is in the
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// 0xE0-prefixed extended range. Used by Windows SendInput to set the
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// KEYEVENTF_EXTENDEDKEY flag.
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func qemuScancodeIsExtended(scancode uint32) bool {
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return scancode&0xFF00 == 0xE000
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}
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// qemuScancodeLowByte returns the byte SendInput's wScan field actually
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// stores: the low byte of the scancode regardless of any extended prefix.
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func qemuScancodeLowByte(scancode uint32) uint16 {
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return uint16(scancode & 0xFF)
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}
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