op: remove operation list argument from MacroOp.Add

The ability to invoke other operation lists belongs in the new CallOp.

While we're here, make MacroOp.Add use a pointer receiver to match the
other methods.

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

internal/opconst/ops.go

@@ -31,7 +31,7 @@ const (
 
 const (
 	TypeMacroDefLen     = 1 + 4 + 4
-	TypeMacroLen        = 1 + 4 + 4 + 4
+	TypeMacroLen        = 1 + 4 + 4
 	TypeTransformLen    = 1 + 4*2
 	TypeLayerLen        = 1
 	TypeRedrawLen       = 1 + 8
@@ -77,7 +77,7 @@ func (t OpType) Size() int {
 
 func (t OpType) NumRefs() int {
 	switch t {
-	case TypeMacro, TypeKeyInput, TypePointerInput, TypeProfile, TypeCall:
+	case TypeKeyInput, TypePointerInput, TypeProfile, TypeCall:
 		return 1
 	case TypeImage:
 		return 2

internal/ops/reader.go

@@ -33,9 +33,7 @@ type Key struct {
 
 // Shadow of op.MacroOp.
 type macroOp struct {
-	ops     *op.Ops
-	version int
-	pc      pc
+	pc pc
 }
 
 // Shadow of op.CallOp.
@@ -119,16 +117,11 @@ func (r *Reader) Decode() (EncodedOp, bool) {
 			continue
 		case opconst.TypeMacro:
 			var op macroOp
-			op.decode(data, refs)
-			macroOps := op.ops
-			macroData := macroOps.Data()
-			macroData = macroData[op.pc.data:]
+			op.decode(data)
+			macroData := r.ops.Data()[op.pc.data:]
 			if opconst.OpType(macroData[0]) != opconst.TypeMacroDef {
 				panic("invalid macro reference")
 			}
-			if op.version != op.ops.Version() {
-				panic("invalid MacroOp reference to reset Ops")
-			}
 			var opDef opMacroDef
 			opDef.decode(macroData[:opconst.TypeMacroDef.Size()])
 			retPC := r.pc
@@ -139,7 +132,6 @@ func (r *Reader) Decode() (EncodedOp, bool) {
 				retPC: retPC,
 				endPC: opDef.endpc,
 			})
-			r.ops = macroOps
 			r.pc = op.pc
 			r.pc.data += opconst.TypeMacroDef.Size()
 			r.pc.refs += opconst.TypeMacroDef.NumRefs()
@@ -180,20 +172,17 @@ func (m *callOp) decode(data []byte, refs []interface{}) {
 	}
 }
 
-func (m *macroOp) decode(data []byte, refs []interface{}) {
+func (m *macroOp) decode(data []byte) {
 	if opconst.OpType(data[0]) != opconst.TypeMacro {
 		panic("invalid op")
 	}
 	bo := binary.LittleEndian
 	dataIdx := int(int32(bo.Uint32(data[1:])))
 	refsIdx := int(int32(bo.Uint32(data[5:])))
-	version := int(int32(bo.Uint32(data[9:])))
 	*m = macroOp{
-		ops: refs[0].(*op.Ops),
 		pc: pc{
 			data: dataIdx,
 			refs: refsIdx,
 		},
-		version: version,
 	}
 }

layout/flex.go

@@ -173,7 +173,7 @@ func (f *Flex) Layout(gtx *Context, children ...FlexChild) {
 		var stack op.StackOp
 		stack.Push(gtx.Ops)
 		op.TransformOp{}.Offset(toPointF(axisPoint(f.Axis, mainSize, cross))).Add(gtx.Ops)
-		child.macro.Add(gtx.Ops)
+		child.macro.Add()
 		stack.Pop()
 		mainSize += axisMain(f.Axis, dims.Size)
 		if i < len(children)-1 {

layout/layout.go

@@ -173,7 +173,7 @@ func (a Align) Layout(gtx *Context, w Widget) {
 	var stack op.StackOp
 	stack.Push(gtx.Ops)
 	op.TransformOp{}.Offset(toPointF(p)).Add(gtx.Ops)
-	macro.Add(gtx.Ops)
+	macro.Add()
 	stack.Pop()
 	gtx.Dimensions = Dimensions{
 		Size:     sz,

layout/list.go

@@ -262,7 +262,7 @@ func (l *List) layout() Dimensions {
 		stack.Push(ops)
 		clip.Rect{Rect: toRectF(r)}.Op(ops).Add(ops)
 		op.TransformOp{}.Offset(toPointF(axisPoint(l.Axis, pos, cross))).Add(ops)
-		child.macro.Add(ops)
+		child.macro.Add()
 		stack.Pop()
 		pos += childSize
 	}
@@ -276,7 +276,7 @@ func (l *List) layout() Dimensions {
 	l.macro.Stop()
 	pointer.Rect(image.Rectangle{Max: dims}).Add(ops)
 	l.scroll.Add(ops)
-	l.macro.Add(ops)
+	l.macro.Add()
 	return Dimensions{Size: dims}
 }
 

layout/stack.go

@@ -97,7 +97,7 @@ func (s *Stack) Layout(gtx *Context, children ...StackChild) {
 		var stack op.StackOp
 		stack.Push(gtx.Ops)
 		op.TransformOp{}.Offset(toPointF(p)).Add(gtx.Ops)
-		ch.macro.Add(gtx.Ops)
+		ch.macro.Add()
 		stack.Pop()
 		if baseline == 0 {
 			if b := ch.dims.Baseline; b != 0 {

op/clip/clip.go

@@ -40,7 +40,7 @@ type Op struct {
 }
 
 func (p Op) Add(o *op.Ops) {
-	p.macro.Add(o)
+	p.macro.Add()
 	data := o.Write(opconst.TypeClipLen)
 	data[0] = byte(opconst.TypeClip)
 	bo := binary.LittleEndian

op/op.go

@@ -63,7 +63,7 @@ The MacroOp records a list of operations to be executed later:
 	macro.Stop()
 
 	// replay the recorded operations by calling Add:
-	macro.Add(ops)
+	macro.Add()
 
 */
 package op
@@ -106,7 +106,6 @@ type StackOp struct {
 type MacroOp struct {
 	recording bool
 	ops       *Ops
-	version   int
 	id        stackID
 	pc        pc
 }
@@ -255,25 +254,21 @@ func (m *MacroOp) fill() {
 	bo := binary.LittleEndian
 	bo.PutUint32(data[1:], uint32(pc.data))
 	bo.PutUint32(data[5:], uint32(pc.refs))
-	m.version = m.ops.version
 }
 
-// Add the recorded list of operations. The Ops
-// argument may be different than the Ops argument
-// passed to Record.
-func (m MacroOp) Add(o *Ops) {
+// Add the recorded list of operations.
+func (m *MacroOp) Add() {
 	if m.recording {
 		panic("a recording is in progress")
 	}
 	if m.ops == nil {
 		return
 	}
-	data := o.Write(opconst.TypeMacroLen, m.ops)
+	data := m.ops.Write(opconst.TypeMacroLen)
 	data[0] = byte(opconst.TypeMacro)
 	bo := binary.LittleEndian
 	bo.PutUint32(data[1:], uint32(m.pc.data))
 	bo.PutUint32(data[5:], uint32(m.pc.refs))
-	bo.PutUint32(data[9:], uint32(m.version))
 }
 
 func (r InvalidateOp) Add(o *Ops) {

widget/material/editor.go

@@ -56,7 +56,7 @@ func (e Editor) Layout(gtx *layout.Context, editor *widget.Editor) {
 		paint.ColorOp{Color: e.Color}.Add(gtx.Ops)
 		editor.PaintText(gtx)
 	} else {
-		macro.Add(gtx.Ops)
+		macro.Add()
 	}
 	paint.ColorOp{Color: e.Color}.Add(gtx.Ops)
 	editor.PaintCaret(gtx)