func (E *Imp) Push(c col.Colour) {
//
B := make([]byte, zl())
a := 0
copy(B[a:a+8], E.origin.Encode())
a += 8
for d := D0; d < NDirs; d++ {
copy(B[a:a+8], E.vec[d].Encode())
a += 8
}
copy(B[a:a+97], col.Encode(c))
stack = append(stack, B)
}
func (f *Imp) Encode() []byte {
//
B := make([]byte, f.Codelen())
a := uint(0)
B[a] = byte(f.sort)
a++
copy(B[a:a+3], col.Encode(f.colour))
a += 3
var n uint
if f.sort < Text {
n = uint(len(f.x))
} else {
n = uint(len(f.tx))
}
copy(B[a:a+clz], Encode(n))
a += clz
if f.sort < Text {
for i := uint(0); i < n; i++ {
copy(B[a:a+clz], Encode(f.x[i]))
a += clz
copy(B[a:a+clz], Encode(f.y[i]))
a += clz
}
} else { // Text, Image
copy(B[a:a+clz], Encode(f.x[0]))
a += clz
copy(B[a:a+clz], Encode(f.y[0]))
a += clz
if f.sort == Image {
copy(B[a:a+clz], Encode(f.x[1]))
a += clz
copy(B[a:a+clz], Encode(f.y[1]))
a += clz
}
copy(B[a:a+n], []byte(f.tx))
a += n
}
B[a] = 0
if f.filled {
B[a]++
}
if f.marked {
B[a] += 2
}
return B
}