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package xgb
// getExtensionOpcode retrieves the extension opcode from the extensions map.
// If one doesn't exist, just return 0. An X error will likely result.
func (c *Conn) getExtensionOpcode(name string) byte {
return c.extensions[name]
}
func (c *Conn) bytesPadding(buf []byte) []byte {
return append(buf, make([]byte, pad(len(buf))-len(buf))...)
}
func (c *Conn) bytesString(str string) []byte {
return c.bytesPadding([]byte(str))
}
func (c *Conn) bytesStrList(list []Str, length int) []byte {
buf := make([]byte, 0)
for _, str := range list {
buf = append(buf, []byte(str.Name)...)
}
return c.bytesPadding(buf)
}
func (c *Conn) bytesUInt32List(list []uint32) []byte {
buf := make([]byte, len(list)*4)
for i, item := range list {
put32(buf[i*4:], item)
}
return c.bytesPadding(buf)
}
func (c *Conn) bytesIdList(list []Id, length int) []byte {
buf := make([]byte, length*4)
for i, item := range list {
put32(buf[i*4:], uint32(item))
}
return c.bytesPadding(buf)
}
// Pad a length to align on 4 bytes.
func pad(n int) int { return (n + 3) & ^3 }
func put16(buf []byte, v uint16) {
buf[0] = byte(v)
buf[1] = byte(v >> 8)
}
func put32(buf []byte, v uint32) {
buf[0] = byte(v)
buf[1] = byte(v >> 8)
buf[2] = byte(v >> 16)
buf[3] = byte(v >> 24)
}
func get16(buf []byte) uint16 {
v := uint16(buf[0])
v |= uint16(buf[1]) << 8
return v
}
func get32(buf []byte) uint32 {
v := uint32(buf[0])
v |= uint32(buf[1]) << 8
v |= uint32(buf[2]) << 16
v |= uint32(buf[3]) << 24
return v
}
// Voodoo to count the number of bits set in a value list mask.
func popCount(mask0 int) int {
mask := uint32(mask0)
n := 0
for i := uint32(0); i < 32; i++ {
if mask&(1<<i) != 0 {
n++
}
}
return n
}
// DefaultScreen returns the Screen info for the default screen, which is
// 0 or the one given in the display argument to Dial.
func (c *Conn) DefaultScreen() *ScreenInfo { return &c.Setup.Roots[c.defaultScreen] }
// ClientMessageData holds the data from a client message,
// duplicated in three forms because Go doesn't have unions.
// type ClientMessageData struct {
// Data8 [20]byte
// Data16 [10]uint16
// Data32 [5]uint32
// }
//
// func getClientMessageData(b []byte, v *ClientMessageData) int {
// copy(v.Data8[:], b)
// for i := 0; i < 10; i++ {
// v.Data16[i] = get16(b[i*2:])
// }
// for i := 0; i < 5; i++ {
// v.Data32[i] = get32(b[i*4:])
// }
// return 20
// }
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