path: root/nexgb/shape/shape.go

// Package shape is the X client API for the SHAPE extension.
package shape

/*
	This file was generated by shape.xml on May 10 2012 8:04:32pm EDT.
	This file is automatically generated. Edit at your peril!
*/

import (
	"github.com/BurntSushi/xgb"

	"github.com/BurntSushi/xgb/xproto"
)

// Init must be called before using the SHAPE extension.
func Init(c *xgb.Conn) error {
	reply, err := xproto.QueryExtension(c, 5, "SHAPE").Reply()
	switch {
	case err != nil:
		return err
	case !reply.Present:
		return xgb.Errorf("No extension named SHAPE could be found on on the server.")
	}

	xgb.ExtLock.Lock()
	c.Extensions["SHAPE"] = reply.MajorOpcode
	for evNum, fun := range xgb.NewExtEventFuncs["SHAPE"] {
		xgb.NewEventFuncs[int(reply.FirstEvent)+evNum] = fun
	}
	for errNum, fun := range xgb.NewExtErrorFuncs["SHAPE"] {
		xgb.NewErrorFuncs[int(reply.FirstError)+errNum] = fun
	}
	xgb.ExtLock.Unlock()

	return nil
}

func init() {
	xgb.NewExtEventFuncs["SHAPE"] = make(map[int]xgb.NewEventFun)
	xgb.NewExtErrorFuncs["SHAPE"] = make(map[int]xgb.NewErrorFun)
}

// Skipping definition for base type 'Card8'

// Skipping definition for base type 'Int16'

// Skipping definition for base type 'Int32'

// Skipping definition for base type 'Void'

// Skipping definition for base type 'Byte'

// Skipping definition for base type 'Int8'

// Skipping definition for base type 'Card16'

// Skipping definition for base type 'Char'

// Skipping definition for base type 'Card32'

// Skipping definition for base type 'Double'

// Skipping definition for base type 'Bool'

// Skipping definition for base type 'Float'

const (
	SoSet       = 0
	SoUnion     = 1
	SoIntersect = 2
	SoSubtract  = 3
	SoInvert    = 4
)

const (
	SkBounding = 0
	SkClip     = 1
	SkInput    = 2
)

type Op byte

type Kind byte

// Event definition Notify (0)
// Size: 32

const Notify = 0

type NotifyEvent struct {
	Sequence       uint16
	ShapeKind      Kind
	AffectedWindow xproto.Window
	ExtentsX       int16
	ExtentsY       int16
	ExtentsWidth   uint16
	ExtentsHeight  uint16
	ServerTime     xproto.Timestamp
	Shaped         bool
	// padding: 11 bytes
}

// Event read Notify
func NotifyEventNew(buf []byte) xgb.Event {
	v := NotifyEvent{}
	b := 1 // don't read event number

	v.ShapeKind = Kind(buf[b])
	b += 1

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.AffectedWindow = xproto.Window(xgb.Get32(buf[b:]))
	b += 4

	v.ExtentsX = int16(xgb.Get16(buf[b:]))
	b += 2

	v.ExtentsY = int16(xgb.Get16(buf[b:]))
	b += 2

	v.ExtentsWidth = xgb.Get16(buf[b:])
	b += 2

	v.ExtentsHeight = xgb.Get16(buf[b:])
	b += 2

	v.ServerTime = xproto.Timestamp(xgb.Get32(buf[b:]))
	b += 4

	if buf[b] == 1 {
		v.Shaped = true
	} else {
		v.Shaped = false
	}
	b += 1

	b += 11 // padding

	return v
}

// Event write Notify
func (v NotifyEvent) Bytes() []byte {
	buf := make([]byte, 32)
	b := 0

	// write event number
	buf[b] = 0
	b += 1

	buf[b] = byte(v.ShapeKind)
	b += 1

	b += 2 // skip sequence number

	xgb.Put32(buf[b:], uint32(v.AffectedWindow))
	b += 4

	xgb.Put16(buf[b:], uint16(v.ExtentsX))
	b += 2

	xgb.Put16(buf[b:], uint16(v.ExtentsY))
	b += 2

	xgb.Put16(buf[b:], v.ExtentsWidth)
	b += 2

	xgb.Put16(buf[b:], v.ExtentsHeight)
	b += 2

	xgb.Put32(buf[b:], uint32(v.ServerTime))
	b += 4

	if v.Shaped {
		buf[b] = 1
	} else {
		buf[b] = 0
	}
	b += 1

	b += 11 // padding

	return buf
}

func (v NotifyEvent) ImplementsEvent() {}

func (v NotifyEvent) SequenceId() uint16 {
	return v.Sequence
}

func (v NotifyEvent) String() string {
	fieldVals := make([]string, 0, 9)
	fieldVals = append(fieldVals, xgb.Sprintf("Sequence: %d", v.Sequence))
	fieldVals = append(fieldVals, xgb.Sprintf("ShapeKind: %d", v.ShapeKind))
	fieldVals = append(fieldVals, xgb.Sprintf("AffectedWindow: %d", v.AffectedWindow))
	fieldVals = append(fieldVals, xgb.Sprintf("ExtentsX: %d", v.ExtentsX))
	fieldVals = append(fieldVals, xgb.Sprintf("ExtentsY: %d", v.ExtentsY))
	fieldVals = append(fieldVals, xgb.Sprintf("ExtentsWidth: %d", v.ExtentsWidth))
	fieldVals = append(fieldVals, xgb.Sprintf("ExtentsHeight: %d", v.ExtentsHeight))
	fieldVals = append(fieldVals, xgb.Sprintf("ServerTime: %d", v.ServerTime))
	fieldVals = append(fieldVals, xgb.Sprintf("Shaped: %t", v.Shaped))
	return "Notify {" + xgb.StringsJoin(fieldVals, ", ") + "}"
}

func init() {
	xgb.NewExtEventFuncs["SHAPE"][0] = NotifyEventNew
}

// Request QueryVersion
// size: 4
type QueryVersionCookie struct {
	*xgb.Cookie
}

func QueryVersion(c *xgb.Conn) QueryVersionCookie {
	cookie := c.NewCookie(true, true)
	c.NewRequest(queryVersionRequest(c), cookie)
	return QueryVersionCookie{cookie}
}

func QueryVersionUnchecked(c *xgb.Conn) QueryVersionCookie {
	cookie := c.NewCookie(false, true)
	c.NewRequest(queryVersionRequest(c), cookie)
	return QueryVersionCookie{cookie}
}

// Request reply for QueryVersion
// size: 12
type QueryVersionReply struct {
	Sequence uint16
	Length   uint32
	// padding: 1 bytes
	MajorVersion uint16
	MinorVersion uint16
}

// Waits and reads reply data from request QueryVersion
func (cook QueryVersionCookie) Reply() (*QueryVersionReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return queryVersionReply(buf), nil
}

// Read reply into structure from buffer for QueryVersion
func queryVersionReply(buf []byte) *QueryVersionReply {
	v := new(QueryVersionReply)
	b := 1 // skip reply determinant

	b += 1 // padding

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	v.MajorVersion = xgb.Get16(buf[b:])
	b += 2

	v.MinorVersion = xgb.Get16(buf[b:])
	b += 2

	return v
}

// Write request to wire for QueryVersion
func queryVersionRequest(c *xgb.Conn) []byte {
	size := 4
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 0 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	return buf
}

// Request Rectangles
// size: xgb.Pad((16 + xgb.Pad((len(Rectangles) * 8))))
type RectanglesCookie struct {
	*xgb.Cookie
}

// Write request to wire for Rectangles
func Rectangles(c *xgb.Conn, Operation Op, DestinationKind Kind, Ordering byte, DestinationWindow xproto.Window, XOffset int16, YOffset int16, Rectangles []xproto.Rectangle) RectanglesCookie {
	cookie := c.NewCookie(false, false)
	c.NewRequest(rectanglesRequest(c, Operation, DestinationKind, Ordering, DestinationWindow, XOffset, YOffset, Rectangles), cookie)
	return RectanglesCookie{cookie}
}

func RectanglesChecked(c *xgb.Conn, Operation Op, DestinationKind Kind, Ordering byte, DestinationWindow xproto.Window, XOffset int16, YOffset int16, Rectangles []xproto.Rectangle) RectanglesCookie {
	cookie := c.NewCookie(true, false)
	c.NewRequest(rectanglesRequest(c, Operation, DestinationKind, Ordering, DestinationWindow, XOffset, YOffset, Rectangles), cookie)
	return RectanglesCookie{cookie}
}

func (cook RectanglesCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for Rectangles
func rectanglesRequest(c *xgb.Conn, Operation Op, DestinationKind Kind, Ordering byte, DestinationWindow xproto.Window, XOffset int16, YOffset int16, Rectangles []xproto.Rectangle) []byte {
	size := xgb.Pad((16 + xgb.Pad((len(Rectangles) * 8))))
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 1 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	buf[b] = byte(Operation)
	b += 1

	buf[b] = byte(DestinationKind)
	b += 1

	buf[b] = Ordering
	b += 1

	b += 1 // padding

	xgb.Put32(buf[b:], uint32(DestinationWindow))
	b += 4

	xgb.Put16(buf[b:], uint16(XOffset))
	b += 2

	xgb.Put16(buf[b:], uint16(YOffset))
	b += 2

	b += xproto.RectangleListBytes(buf[b:], Rectangles)

	return buf
}

// Request Mask
// size: 20
type MaskCookie struct {
	*xgb.Cookie
}

// Write request to wire for Mask
func Mask(c *xgb.Conn, Operation Op, DestinationKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16, SourceBitmap xproto.Pixmap) MaskCookie {
	cookie := c.NewCookie(false, false)
	c.NewRequest(maskRequest(c, Operation, DestinationKind, DestinationWindow, XOffset, YOffset, SourceBitmap), cookie)
	return MaskCookie{cookie}
}

func MaskChecked(c *xgb.Conn, Operation Op, DestinationKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16, SourceBitmap xproto.Pixmap) MaskCookie {
	cookie := c.NewCookie(true, false)
	c.NewRequest(maskRequest(c, Operation, DestinationKind, DestinationWindow, XOffset, YOffset, SourceBitmap), cookie)
	return MaskCookie{cookie}
}

func (cook MaskCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for Mask
func maskRequest(c *xgb.Conn, Operation Op, DestinationKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16, SourceBitmap xproto.Pixmap) []byte {
	size := 20
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 2 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	buf[b] = byte(Operation)
	b += 1

	buf[b] = byte(DestinationKind)
	b += 1

	b += 2 // padding

	xgb.Put32(buf[b:], uint32(DestinationWindow))
	b += 4

	xgb.Put16(buf[b:], uint16(XOffset))
	b += 2

	xgb.Put16(buf[b:], uint16(YOffset))
	b += 2

	xgb.Put32(buf[b:], uint32(SourceBitmap))
	b += 4

	return buf
}

// Request Combine
// size: 20
type CombineCookie struct {
	*xgb.Cookie
}

// Write request to wire for Combine
func Combine(c *xgb.Conn, Operation Op, DestinationKind Kind, SourceKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16, SourceWindow xproto.Window) CombineCookie {
	cookie := c.NewCookie(false, false)
	c.NewRequest(combineRequest(c, Operation, DestinationKind, SourceKind, DestinationWindow, XOffset, YOffset, SourceWindow), cookie)
	return CombineCookie{cookie}
}

func CombineChecked(c *xgb.Conn, Operation Op, DestinationKind Kind, SourceKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16, SourceWindow xproto.Window) CombineCookie {
	cookie := c.NewCookie(true, false)
	c.NewRequest(combineRequest(c, Operation, DestinationKind, SourceKind, DestinationWindow, XOffset, YOffset, SourceWindow), cookie)
	return CombineCookie{cookie}
}

func (cook CombineCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for Combine
func combineRequest(c *xgb.Conn, Operation Op, DestinationKind Kind, SourceKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16, SourceWindow xproto.Window) []byte {
	size := 20
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 3 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	buf[b] = byte(Operation)
	b += 1

	buf[b] = byte(DestinationKind)
	b += 1

	buf[b] = byte(SourceKind)
	b += 1

	b += 1 // padding

	xgb.Put32(buf[b:], uint32(DestinationWindow))
	b += 4

	xgb.Put16(buf[b:], uint16(XOffset))
	b += 2

	xgb.Put16(buf[b:], uint16(YOffset))
	b += 2

	xgb.Put32(buf[b:], uint32(SourceWindow))
	b += 4

	return buf
}

// Request Offset
// size: 16
type OffsetCookie struct {
	*xgb.Cookie
}

// Write request to wire for Offset
func Offset(c *xgb.Conn, DestinationKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16) OffsetCookie {
	cookie := c.NewCookie(false, false)
	c.NewRequest(offsetRequest(c, DestinationKind, DestinationWindow, XOffset, YOffset), cookie)
	return OffsetCookie{cookie}
}

func OffsetChecked(c *xgb.Conn, DestinationKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16) OffsetCookie {
	cookie := c.NewCookie(true, false)
	c.NewRequest(offsetRequest(c, DestinationKind, DestinationWindow, XOffset, YOffset), cookie)
	return OffsetCookie{cookie}
}

func (cook OffsetCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for Offset
func offsetRequest(c *xgb.Conn, DestinationKind Kind, DestinationWindow xproto.Window, XOffset int16, YOffset int16) []byte {
	size := 16
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 4 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	buf[b] = byte(DestinationKind)
	b += 1

	b += 3 // padding

	xgb.Put32(buf[b:], uint32(DestinationWindow))
	b += 4

	xgb.Put16(buf[b:], uint16(XOffset))
	b += 2

	xgb.Put16(buf[b:], uint16(YOffset))
	b += 2

	return buf
}

// Request QueryExtents
// size: 8
type QueryExtentsCookie struct {
	*xgb.Cookie
}

func QueryExtents(c *xgb.Conn, DestinationWindow xproto.Window) QueryExtentsCookie {
	cookie := c.NewCookie(true, true)
	c.NewRequest(queryExtentsRequest(c, DestinationWindow), cookie)
	return QueryExtentsCookie{cookie}
}

func QueryExtentsUnchecked(c *xgb.Conn, DestinationWindow xproto.Window) QueryExtentsCookie {
	cookie := c.NewCookie(false, true)
	c.NewRequest(queryExtentsRequest(c, DestinationWindow), cookie)
	return QueryExtentsCookie{cookie}
}

// Request reply for QueryExtents
// size: 28
type QueryExtentsReply struct {
	Sequence uint16
	Length   uint32
	// padding: 1 bytes
	BoundingShaped bool
	ClipShaped     bool
	// padding: 2 bytes
	BoundingShapeExtentsX      int16
	BoundingShapeExtentsY      int16
	BoundingShapeExtentsWidth  uint16
	BoundingShapeExtentsHeight uint16
	ClipShapeExtentsX          int16
	ClipShapeExtentsY          int16
	ClipShapeExtentsWidth      uint16
	ClipShapeExtentsHeight     uint16
}

// Waits and reads reply data from request QueryExtents
func (cook QueryExtentsCookie) Reply() (*QueryExtentsReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return queryExtentsReply(buf), nil
}

// Read reply into structure from buffer for QueryExtents
func queryExtentsReply(buf []byte) *QueryExtentsReply {
	v := new(QueryExtentsReply)
	b := 1 // skip reply determinant

	b += 1 // padding

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	if buf[b] == 1 {
		v.BoundingShaped = true
	} else {
		v.BoundingShaped = false
	}
	b += 1

	if buf[b] == 1 {
		v.ClipShaped = true
	} else {
		v.ClipShaped = false
	}
	b += 1

	b += 2 // padding

	v.BoundingShapeExtentsX = int16(xgb.Get16(buf[b:]))
	b += 2

	v.BoundingShapeExtentsY = int16(xgb.Get16(buf[b:]))
	b += 2

	v.BoundingShapeExtentsWidth = xgb.Get16(buf[b:])
	b += 2

	v.BoundingShapeExtentsHeight = xgb.Get16(buf[b:])
	b += 2

	v.ClipShapeExtentsX = int16(xgb.Get16(buf[b:]))
	b += 2

	v.ClipShapeExtentsY = int16(xgb.Get16(buf[b:]))
	b += 2

	v.ClipShapeExtentsWidth = xgb.Get16(buf[b:])
	b += 2

	v.ClipShapeExtentsHeight = xgb.Get16(buf[b:])
	b += 2

	return v
}

// Write request to wire for QueryExtents
func queryExtentsRequest(c *xgb.Conn, DestinationWindow xproto.Window) []byte {
	size := 8
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 5 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(DestinationWindow))
	b += 4

	return buf
}

// Request SelectInput
// size: 12
type SelectInputCookie struct {
	*xgb.Cookie
}

// Write request to wire for SelectInput
func SelectInput(c *xgb.Conn, DestinationWindow xproto.Window, Enable bool) SelectInputCookie {
	cookie := c.NewCookie(false, false)
	c.NewRequest(selectInputRequest(c, DestinationWindow, Enable), cookie)
	return SelectInputCookie{cookie}
}

func SelectInputChecked(c *xgb.Conn, DestinationWindow xproto.Window, Enable bool) SelectInputCookie {
	cookie := c.NewCookie(true, false)
	c.NewRequest(selectInputRequest(c, DestinationWindow, Enable), cookie)
	return SelectInputCookie{cookie}
}

func (cook SelectInputCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for SelectInput
func selectInputRequest(c *xgb.Conn, DestinationWindow xproto.Window, Enable bool) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 6 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(DestinationWindow))
	b += 4

	if Enable {
		buf[b] = 1
	} else {
		buf[b] = 0
	}
	b += 1

	b += 3 // padding

	return buf
}

// Request InputSelected
// size: 8
type InputSelectedCookie struct {
	*xgb.Cookie
}

func InputSelected(c *xgb.Conn, DestinationWindow xproto.Window) InputSelectedCookie {
	cookie := c.NewCookie(true, true)
	c.NewRequest(inputSelectedRequest(c, DestinationWindow), cookie)
	return InputSelectedCookie{cookie}
}

func InputSelectedUnchecked(c *xgb.Conn, DestinationWindow xproto.Window) InputSelectedCookie {
	cookie := c.NewCookie(false, true)
	c.NewRequest(inputSelectedRequest(c, DestinationWindow), cookie)
	return InputSelectedCookie{cookie}
}

// Request reply for InputSelected
// size: 8
type InputSelectedReply struct {
	Sequence uint16
	Length   uint32
	Enabled  bool
}

// Waits and reads reply data from request InputSelected
func (cook InputSelectedCookie) Reply() (*InputSelectedReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return inputSelectedReply(buf), nil
}

// Read reply into structure from buffer for InputSelected
func inputSelectedReply(buf []byte) *InputSelectedReply {
	v := new(InputSelectedReply)
	b := 1 // skip reply determinant

	if buf[b] == 1 {
		v.Enabled = true
	} else {
		v.Enabled = false
	}
	b += 1

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	return v
}

// Write request to wire for InputSelected
func inputSelectedRequest(c *xgb.Conn, DestinationWindow xproto.Window) []byte {
	size := 8
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 7 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(DestinationWindow))
	b += 4

	return buf
}

// Request GetRectangles
// size: 12
type GetRectanglesCookie struct {
	*xgb.Cookie
}

func GetRectangles(c *xgb.Conn, Window xproto.Window, SourceKind Kind) GetRectanglesCookie {
	cookie := c.NewCookie(true, true)
	c.NewRequest(getRectanglesRequest(c, Window, SourceKind), cookie)
	return GetRectanglesCookie{cookie}
}

func GetRectanglesUnchecked(c *xgb.Conn, Window xproto.Window, SourceKind Kind) GetRectanglesCookie {
	cookie := c.NewCookie(false, true)
	c.NewRequest(getRectanglesRequest(c, Window, SourceKind), cookie)
	return GetRectanglesCookie{cookie}
}

// Request reply for GetRectangles
// size: (32 + xgb.Pad((int(RectanglesLen) * 8)))
type GetRectanglesReply struct {
	Sequence      uint16
	Length        uint32
	Ordering      byte
	RectanglesLen uint32
	// padding: 20 bytes
	Rectangles []xproto.Rectangle // size: xgb.Pad((int(RectanglesLen) * 8))
}

// Waits and reads reply data from request GetRectangles
func (cook GetRectanglesCookie) Reply() (*GetRectanglesReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return getRectanglesReply(buf), nil
}

// Read reply into structure from buffer for GetRectangles
func getRectanglesReply(buf []byte) *GetRectanglesReply {
	v := new(GetRectanglesReply)
	b := 1 // skip reply determinant

	v.Ordering = buf[b]
	b += 1

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	v.RectanglesLen = xgb.Get32(buf[b:])
	b += 4

	b += 20 // padding

	v.Rectangles = make([]xproto.Rectangle, v.RectanglesLen)
	b += xproto.RectangleReadList(buf[b:], v.Rectangles)

	return v
}

// Write request to wire for GetRectangles
func getRectanglesRequest(c *xgb.Conn, Window xproto.Window, SourceKind Kind) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["SHAPE"]
	b += 1

	buf[b] = 8 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	buf[b] = byte(SourceKind)
	b += 1

	b += 3 // padding

	return buf
}