op: add package op for operations

Extract operation types from package ui into package op.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

internal/ops/ops.go

@@ -6,17 +6,17 @@ import (
 	"encoding/binary"
 	"math"
 
-	"gioui.org/ui"
 	"gioui.org/f32"
 	"gioui.org/internal/opconst"
+	"gioui.org/op"
 )
 
-func DecodeTransformOp(d []byte) ui.TransformOp {
+func DecodeTransformOp(d []byte) op.TransformOp {
 	bo := binary.LittleEndian
 	if opconst.OpType(d[0]) != opconst.TypeTransform {
 		panic("invalid op")
 	}
-	return ui.TransformOp{}.Offset(f32.Point{
+	return op.TransformOp{}.Offset(f32.Point{
 		X: math.Float32frombits(bo.Uint32(d[1:])),
 		Y: math.Float32frombits(bo.Uint32(d[5:])),
 	})