100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
package xgb
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import (
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"fmt"
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"strings"
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)
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// getExtensionOpcode retrieves the extension opcode from the extensions map.
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// If one doesn't exist, just return 0. An X error will likely result.
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func (c *Conn) getExtensionOpcode(name string) byte {
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return c.extensions[name]
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}
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func (c *Conn) bytesPadding(buf []byte) []byte {
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return append(buf, make([]byte, pad(len(buf))-len(buf))...)
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}
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func (c *Conn) bytesString(str string) []byte {
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return c.bytesPadding([]byte(str))
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}
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// stringsJoin is an alias to strings.Join. It allows us to avoid having to
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// import 'strings' in each of the generated Go files.
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func stringsJoin(ss []string, sep string) string {
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return strings.Join(ss, sep)
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}
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// sprintf is so we don't need to import 'fmt' in the generated Go files.
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func sprintf(format string, v ...interface{}) string {
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return fmt.Sprintf(format, v...)
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}
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// Pad a length to align on 4 bytes.
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func pad(n int) int { return (n + 3) & ^3 }
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func Put16(buf []byte, v uint16) {
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buf[0] = byte(v)
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buf[1] = byte(v >> 8)
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}
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func Put32(buf []byte, v uint32) {
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buf[0] = byte(v)
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buf[1] = byte(v >> 8)
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buf[2] = byte(v >> 16)
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buf[3] = byte(v >> 24)
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}
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func Put64(buf []byte, v uint64) {
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buf[0] = byte(v)
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buf[1] = byte(v >> 8)
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buf[2] = byte(v >> 16)
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buf[3] = byte(v >> 24)
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buf[4] = byte(v >> 32)
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buf[5] = byte(v >> 40)
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buf[6] = byte(v >> 48)
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buf[7] = byte(v >> 56)
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}
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func Get16(buf []byte) uint16 {
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v := uint16(buf[0])
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v |= uint16(buf[1]) << 8
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return v
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}
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func Get32(buf []byte) uint32 {
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v := uint32(buf[0])
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v |= uint32(buf[1]) << 8
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v |= uint32(buf[2]) << 16
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v |= uint32(buf[3]) << 24
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return v
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}
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func Get64(buf []byte) uint64 {
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v := uint64(buf[0])
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v |= uint64(buf[1]) << 8
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v |= uint64(buf[2]) << 16
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v |= uint64(buf[3]) << 24
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v |= uint64(buf[4]) << 32
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v |= uint64(buf[5]) << 40
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v |= uint64(buf[6]) << 48
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v |= uint64(buf[7]) << 56
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return v
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}
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// Voodoo to count the number of bits set in a value list mask.
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func popCount(mask0 int) int {
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mask := uint32(mask0)
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n := 0
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for i := uint32(0); i < 32; i++ {
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if mask&(1<<i) != 0 {
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n++
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}
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}
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return n
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}
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// DefaultScreen returns the Screen info for the default screen, which is
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// 0 or the one given in the display argument to Dial.
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func (c *Conn) DefaultScreen() *ScreenInfo { return &c.Setup.Roots[c.defaultScreen] }
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