all: remove exported Decode methods on operations

Add decode functions to the packages that need them instead. For
TransformOp that is used in multiple packages, add the decode
function to the internal ops package.

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

ui/app/internal/input/router.go

@@ -3,6 +3,7 @@
 package input
 
 import (
+	"encoding/binary"
 	"time"
 
 	"gioui.org/ui"
@@ -74,15 +75,13 @@ func (q *Router) collect() {
 	for encOp, ok := q.reader.Decode(); ok; encOp, ok = q.reader.Decode() {
 		switch opconst.OpType(encOp.Data[0]) {
 		case opconst.TypeInvalidate:
-			var op ui.InvalidateOp
-			op.Decode(encOp.Data)
+			op := decodeInvalidateOp(encOp.Data)
 			if !q.wakeup || op.At.Before(q.wakeupTime) {
 				q.wakeup = true
 				q.wakeupTime = op.At
 			}
 		case opconst.TypeProfile:
-			var op system.ProfileOp
-			op.Decode(encOp.Data, encOp.Refs)
+			op := decodeProfileOp(encOp.Data, encOp.Refs)
 			q.profHandlers = append(q.profHandlers, op.Key)
 		}
 	}
@@ -141,3 +140,24 @@ func (h *handlerEvents) Clear() {
 		delete(h.handlers, k)
 	}
 }
+
+func decodeProfileOp(d []byte, refs []interface{}) system.ProfileOp {
+	if opconst.OpType(d[0]) != opconst.TypeProfile {
+		panic("invalid op")
+	}
+	return system.ProfileOp{
+		Key: refs[0].(input.Key),
+	}
+}
+
+func decodeInvalidateOp(d []byte) ui.InvalidateOp {
+	bo := binary.LittleEndian
+	if opconst.OpType(d[0]) != opconst.TypeInvalidate {
+		panic("invalid op")
+	}
+	var o ui.InvalidateOp
+	if nanos := bo.Uint64(d[1:]); nanos > 0 {
+		o.At = time.Unix(0, int64(nanos))
+	}
+	return o
+}