internal/ops: avoid bounds check in OpType.Size()

Signed-off-by: Egon Elbre <egonelbre@gmail.com>

internal/ops/ops.go

@@ -380,48 +380,50 @@ func DecodeLoad(data []byte) int {
 	return int(bo.Uint32(data[1:]))
 }
 
+var opSize = [0x100]byte{
+	TypeMacro:            TypeMacroLen,
+	TypeCall:             TypeCallLen,
+	TypeDefer:            TypeDeferLen,
+	TypePushTransform:    TypePushTransformLen,
+	TypeTransform:        TypeTransformLen,
+	TypePopTransform:     TypePopTransformLen,
+	TypeInvalidate:       TypeRedrawLen,
+	TypeImage:            TypeImageLen,
+	TypePaint:            TypePaintLen,
+	TypeColor:            TypeColorLen,
+	TypeLinearGradient:   TypeLinearGradientLen,
+	TypePass:             TypePassLen,
+	TypePopPass:          TypePopPassLen,
+	TypePointerInput:     TypePointerInputLen,
+	TypeClipboardRead:    TypeClipboardReadLen,
+	TypeClipboardWrite:   TypeClipboardWriteLen,
+	TypeSource:           TypeSourceLen,
+	TypeTarget:           TypeTargetLen,
+	TypeOffer:            TypeOfferLen,
+	TypeKeyInput:         TypeKeyInputLen,
+	TypeKeyFocus:         TypeKeyFocusLen,
+	TypeKeySoftKeyboard:  TypeKeySoftKeyboardLen,
+	TypeSave:             TypeSaveLen,
+	TypeLoad:             TypeLoadLen,
+	TypeAux:              TypeAuxLen,
+	TypeClip:             TypeClipLen,
+	TypePopClip:          TypePopClipLen,
+	TypeProfile:          TypeProfileLen,
+	TypeCursor:           TypeCursorLen,
+	TypePath:             TypePathLen,
+	TypeStroke:           TypeStrokeLen,
+	TypeSemanticLabel:    TypeSemanticLabelLen,
+	TypeSemanticDesc:     TypeSemanticDescLen,
+	TypeSemanticClass:    TypeSemanticClassLen,
+	TypeSemanticSelected: TypeSemanticSelectedLen,
+	TypeSemanticDisabled: TypeSemanticDisabledLen,
+	TypeSnippet:          TypeSnippetLen,
+	TypeSelection:        TypeSelectionLen,
+	TypeActionInput:      TypeActionInputLen,
+}
+
 func (t OpType) Size() int {
-	return [...]int{
+	return int(opSize[t])
-		TypeMacroLen,
-		TypeCallLen,
-		TypeDeferLen,
-		TypePushTransformLen,
-		TypeTransformLen,
-		TypePopTransformLen,
-		TypeRedrawLen,
-		TypeImageLen,
-		TypePaintLen,
-		TypeColorLen,
-		TypeLinearGradientLen,
-		TypePassLen,
-		TypePopPassLen,
-		TypePointerInputLen,
-		TypeClipboardReadLen,
-		TypeClipboardWriteLen,
-		TypeSourceLen,
-		TypeTargetLen,
-		TypeOfferLen,
-		TypeKeyInputLen,
-		TypeKeyFocusLen,
-		TypeKeySoftKeyboardLen,
-		TypeSaveLen,
-		TypeLoadLen,
-		TypeAuxLen,
-		TypeClipLen,
-		TypePopClipLen,
-		TypeProfileLen,
-		TypeCursorLen,
-		TypePathLen,
-		TypeStrokeLen,
-		TypeSemanticLabelLen,
-		TypeSemanticDescLen,
-		TypeSemanticClassLen,
-		TypeSemanticSelectedLen,
-		TypeSemanticDisabledLen,
-		TypeSnippetLen,
-		TypeSelectionLen,
-		TypeActionInputLen,
-	}[t-firstOpIndex]
 }
 
 func (t OpType) NumRefs() int {