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ops.go
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ops.go
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// SPDX-License-Identifier: Unlicense OR MIT
package ops
import (
"encoding/binary"
"image"
"math"
"github.com/kanryu/mado/f32"
"github.com/kanryu/mado/internal/byteslice"
"github.com/kanryu/mado/internal/scene"
)
type Ops struct {
// version is incremented at each Reset.
version uint32
// data contains the serialized operations.
data []byte
// refs hold external references for operations.
refs []interface{}
// stringRefs provides space for string references, pointers to which will
// be stored in refs. Storing a string directly in refs would cause a heap
// allocation, to store the string header in an interface value. The backing
// array of stringRefs, on the other hand, gets reused between calls to
// reset, making string references free on average.
//
// Appending to stringRefs might reallocate the backing array, which will
// leave pointers to the old array in refs. This temporarily causes a slight
// increase in memory usage, but this, too, amortizes away as the capacity
// of stringRefs approaches its stable maximum.
stringRefs []string
// nextStateID is the id allocated for the next
// StateOp.
nextStateID uint32
// multipOp indicates a multi-op such as clip.Path is being added.
multipOp bool
macroStack stack
stacks [_StackKind]stack
}
type OpType byte
type Shape byte
// Start at a high number for easier debugging.
const firstOpIndex = 200
const (
TypeMacro OpType = iota + firstOpIndex
TypeCall
TypeDefer
TypeTransform
TypePopTransform
TypePushOpacity
TypePopOpacity
TypeImage
TypePaint
TypeColor
TypeLinearGradient
TypePass
TypePopPass
TypeInput
TypeKeyInputHint
TypeSave
TypeLoad
TypeAux
TypeClip
TypePopClip
TypeCursor
TypePath
TypeStroke
TypeSemanticLabel
TypeSemanticDesc
TypeSemanticClass
TypeSemanticSelected
TypeSemanticEnabled
TypeActionInput
)
type StackID struct {
id uint32
prev uint32
}
// StateOp represents a saved operation snapshot to be restored
// later.
type StateOp struct {
id uint32
macroID uint32
ops *Ops
}
// stack tracks the integer identities of stack operations to ensure correct
// pairing of their push and pop methods.
type stack struct {
currentID uint32
nextID uint32
}
type StackKind uint8
// ClipOp is the shadow of clip.Op.
type ClipOp struct {
Bounds image.Rectangle
Outline bool
Shape Shape
}
const (
ClipStack StackKind = iota
TransStack
PassStack
OpacityStack
_StackKind
)
const (
Path Shape = iota
Ellipse
Rect
)
const (
TypeMacroLen = 1 + 4 + 4
TypeCallLen = 1 + 4 + 4 + 4 + 4
TypeDeferLen = 1
TypeTransformLen = 1 + 1 + 4*6
TypePopTransformLen = 1
TypePushOpacityLen = 1 + 4
TypePopOpacityLen = 1
TypeRedrawLen = 1 + 8
TypeImageLen = 1 + 1
TypePaintLen = 1
TypeColorLen = 1 + 4
TypeLinearGradientLen = 1 + 8*2 + 4*2
TypePassLen = 1
TypePopPassLen = 1
TypeInputLen = 1
TypeKeyInputHintLen = 1 + 1
TypeSaveLen = 1 + 4
TypeLoadLen = 1 + 4
TypeAuxLen = 1
TypeClipLen = 1 + 4*4 + 1 + 1
TypePopClipLen = 1
TypeCursorLen = 2
TypePathLen = 8 + 1
TypeStrokeLen = 1 + 4
TypeSemanticLabelLen = 1
TypeSemanticDescLen = 1
TypeSemanticClassLen = 2
TypeSemanticSelectedLen = 2
TypeSemanticEnabledLen = 2
TypeActionInputLen = 1 + 1
)
func (op *ClipOp) Decode(data []byte) {
if len(data) < TypeClipLen || OpType(data[0]) != TypeClip {
panic("invalid op")
}
data = data[:TypeClipLen]
bo := binary.LittleEndian
op.Bounds.Min.X = int(int32(bo.Uint32(data[1:])))
op.Bounds.Min.Y = int(int32(bo.Uint32(data[5:])))
op.Bounds.Max.X = int(int32(bo.Uint32(data[9:])))
op.Bounds.Max.Y = int(int32(bo.Uint32(data[13:])))
op.Outline = data[17] == 1
op.Shape = Shape(data[18])
}
func Reset(o *Ops) {
o.macroStack = stack{}
o.stacks = [_StackKind]stack{}
// Leave references to the GC.
for i := range o.refs {
o.refs[i] = nil
}
for i := range o.stringRefs {
o.stringRefs[i] = ""
}
o.data = o.data[:0]
o.refs = o.refs[:0]
o.stringRefs = o.stringRefs[:0]
o.nextStateID = 0
o.version++
}
func Write(o *Ops, n int) []byte {
if o.multipOp {
panic("cannot mix multi ops with single ones")
}
o.data = append(o.data, make([]byte, n)...)
return o.data[len(o.data)-n:]
}
func BeginMulti(o *Ops) {
if o.multipOp {
panic("cannot interleave multi ops")
}
o.multipOp = true
}
func EndMulti(o *Ops) {
if !o.multipOp {
panic("cannot end non multi ops")
}
o.multipOp = false
}
func WriteMulti(o *Ops, n int) []byte {
if !o.multipOp {
panic("cannot use multi ops in single ops")
}
o.data = append(o.data, make([]byte, n)...)
return o.data[len(o.data)-n:]
}
func PushMacro(o *Ops) StackID {
return o.macroStack.push()
}
func PopMacro(o *Ops, id StackID) {
o.macroStack.pop(id)
}
func FillMacro(o *Ops, startPC PC) {
pc := PCFor(o)
// Fill out the macro definition reserved in Record.
data := o.data[startPC.data:]
data = data[:TypeMacroLen]
data[0] = byte(TypeMacro)
bo := binary.LittleEndian
bo.PutUint32(data[1:], uint32(pc.data))
bo.PutUint32(data[5:], uint32(pc.refs))
}
func AddCall(o *Ops, callOps *Ops, pc PC, end PC) {
data := Write1(o, TypeCallLen, callOps)
data[0] = byte(TypeCall)
bo := binary.LittleEndian
bo.PutUint32(data[1:], uint32(pc.data))
bo.PutUint32(data[5:], uint32(pc.refs))
bo.PutUint32(data[9:], uint32(end.data))
bo.PutUint32(data[13:], uint32(end.refs))
}
func PushOp(o *Ops, kind StackKind) (StackID, uint32) {
return o.stacks[kind].push(), o.macroStack.currentID
}
func PopOp(o *Ops, kind StackKind, sid StackID, macroID uint32) {
if o.macroStack.currentID != macroID {
panic("stack push and pop must not cross macro boundary")
}
o.stacks[kind].pop(sid)
}
func Write1(o *Ops, n int, ref1 interface{}) []byte {
o.data = append(o.data, make([]byte, n)...)
o.refs = append(o.refs, ref1)
return o.data[len(o.data)-n:]
}
func Write1String(o *Ops, n int, ref1 string) []byte {
o.data = append(o.data, make([]byte, n)...)
o.stringRefs = append(o.stringRefs, ref1)
o.refs = append(o.refs, &o.stringRefs[len(o.stringRefs)-1])
return o.data[len(o.data)-n:]
}
func Write2(o *Ops, n int, ref1, ref2 interface{}) []byte {
o.data = append(o.data, make([]byte, n)...)
o.refs = append(o.refs, ref1, ref2)
return o.data[len(o.data)-n:]
}
func Write2String(o *Ops, n int, ref1 interface{}, ref2 string) []byte {
o.data = append(o.data, make([]byte, n)...)
o.stringRefs = append(o.stringRefs, ref2)
o.refs = append(o.refs, ref1, &o.stringRefs[len(o.stringRefs)-1])
return o.data[len(o.data)-n:]
}
func Write3(o *Ops, n int, ref1, ref2, ref3 interface{}) []byte {
o.data = append(o.data, make([]byte, n)...)
o.refs = append(o.refs, ref1, ref2, ref3)
return o.data[len(o.data)-n:]
}
func PCFor(o *Ops) PC {
return PC{data: uint32(len(o.data)), refs: uint32(len(o.refs))}
}
func (s *stack) push() StackID {
s.nextID++
sid := StackID{
id: s.nextID,
prev: s.currentID,
}
s.currentID = s.nextID
return sid
}
func (s *stack) check(sid StackID) {
if s.currentID != sid.id {
panic("unbalanced operation")
}
}
func (s *stack) pop(sid StackID) {
s.check(sid)
s.currentID = sid.prev
}
// Save the effective transformation.
func Save(o *Ops) StateOp {
o.nextStateID++
s := StateOp{
ops: o,
id: o.nextStateID,
macroID: o.macroStack.currentID,
}
bo := binary.LittleEndian
data := Write(o, TypeSaveLen)
data[0] = byte(TypeSave)
bo.PutUint32(data[1:], uint32(s.id))
return s
}
// Load a previously saved operations state given
// its ID.
func (s StateOp) Load() {
bo := binary.LittleEndian
data := Write(s.ops, TypeLoadLen)
data[0] = byte(TypeLoad)
bo.PutUint32(data[1:], uint32(s.id))
}
func DecodeCommand(d []byte) scene.Command {
var cmd scene.Command
copy(byteslice.Uint32(cmd[:]), d)
return cmd
}
func EncodeCommand(out []byte, cmd scene.Command) {
copy(out, byteslice.Uint32(cmd[:]))
}
func DecodeTransform(data []byte) (t f32.Affine2D, push bool) {
if OpType(data[0]) != TypeTransform {
panic("invalid op")
}
push = data[1] != 0
data = data[2:]
data = data[:4*6]
bo := binary.LittleEndian
a := math.Float32frombits(bo.Uint32(data))
b := math.Float32frombits(bo.Uint32(data[4*1:]))
c := math.Float32frombits(bo.Uint32(data[4*2:]))
d := math.Float32frombits(bo.Uint32(data[4*3:]))
e := math.Float32frombits(bo.Uint32(data[4*4:]))
f := math.Float32frombits(bo.Uint32(data[4*5:]))
return f32.NewAffine2D(a, b, c, d, e, f), push
}
func DecodeOpacity(data []byte) float32 {
if OpType(data[0]) != TypePushOpacity {
panic("invalid op")
}
bo := binary.LittleEndian
return math.Float32frombits(bo.Uint32(data[1:]))
}
// DecodeSave decodes the state id of a save op.
func DecodeSave(data []byte) int {
if OpType(data[0]) != TypeSave {
panic("invalid op")
}
bo := binary.LittleEndian
return int(bo.Uint32(data[1:]))
}
// DecodeLoad decodes the state id of a load op.
func DecodeLoad(data []byte) int {
if OpType(data[0]) != TypeLoad {
panic("invalid op")
}
bo := binary.LittleEndian
return int(bo.Uint32(data[1:]))
}
type opProp struct {
Size byte
NumRefs byte
}
var opProps = [0x100]opProp{
TypeMacro: {Size: TypeMacroLen, NumRefs: 0},
TypeCall: {Size: TypeCallLen, NumRefs: 1},
TypeDefer: {Size: TypeDeferLen, NumRefs: 0},
TypeTransform: {Size: TypeTransformLen, NumRefs: 0},
TypePopTransform: {Size: TypePopTransformLen, NumRefs: 0},
TypePushOpacity: {Size: TypePushOpacityLen, NumRefs: 0},
TypePopOpacity: {Size: TypePopOpacityLen, NumRefs: 0},
TypeImage: {Size: TypeImageLen, NumRefs: 2},
TypePaint: {Size: TypePaintLen, NumRefs: 0},
TypeColor: {Size: TypeColorLen, NumRefs: 0},
TypeLinearGradient: {Size: TypeLinearGradientLen, NumRefs: 0},
TypePass: {Size: TypePassLen, NumRefs: 0},
TypePopPass: {Size: TypePopPassLen, NumRefs: 0},
TypeInput: {Size: TypeInputLen, NumRefs: 1},
TypeKeyInputHint: {Size: TypeKeyInputHintLen, NumRefs: 1},
TypeSave: {Size: TypeSaveLen, NumRefs: 0},
TypeLoad: {Size: TypeLoadLen, NumRefs: 0},
TypeAux: {Size: TypeAuxLen, NumRefs: 0},
TypeClip: {Size: TypeClipLen, NumRefs: 0},
TypePopClip: {Size: TypePopClipLen, NumRefs: 0},
TypeCursor: {Size: TypeCursorLen, NumRefs: 0},
TypePath: {Size: TypePathLen, NumRefs: 0},
TypeStroke: {Size: TypeStrokeLen, NumRefs: 0},
TypeSemanticLabel: {Size: TypeSemanticLabelLen, NumRefs: 1},
TypeSemanticDesc: {Size: TypeSemanticDescLen, NumRefs: 1},
TypeSemanticClass: {Size: TypeSemanticClassLen, NumRefs: 0},
TypeSemanticSelected: {Size: TypeSemanticSelectedLen, NumRefs: 0},
TypeSemanticEnabled: {Size: TypeSemanticEnabledLen, NumRefs: 0},
TypeActionInput: {Size: TypeActionInputLen, NumRefs: 0},
}
func (t OpType) props() (size, numRefs uint32) {
v := opProps[t]
return uint32(v.Size), uint32(v.NumRefs)
}
func (t OpType) Size() uint32 {
return uint32(opProps[t].Size)
}
func (t OpType) NumRefs() uint32 {
return uint32(opProps[t].NumRefs)
}
func (t OpType) String() string {
switch t {
case TypeMacro:
return "Macro"
case TypeCall:
return "Call"
case TypeDefer:
return "Defer"
case TypeTransform:
return "Transform"
case TypePopTransform:
return "PopTransform"
case TypePushOpacity:
return "PushOpacity"
case TypePopOpacity:
return "PopOpacity"
case TypeImage:
return "Image"
case TypePaint:
return "Paint"
case TypeColor:
return "Color"
case TypeLinearGradient:
return "LinearGradient"
case TypePass:
return "Pass"
case TypePopPass:
return "PopPass"
case TypeInput:
return "Input"
case TypeKeyInputHint:
return "KeyInputHint"
case TypeSave:
return "Save"
case TypeLoad:
return "Load"
case TypeAux:
return "Aux"
case TypeClip:
return "Clip"
case TypePopClip:
return "PopClip"
case TypeCursor:
return "Cursor"
case TypePath:
return "Path"
case TypeStroke:
return "Stroke"
case TypeSemanticLabel:
return "SemanticDescription"
default:
panic("unknown OpType")
}
}