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https://git.sr.ht/~eliasnaur/gio
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Elias Naur
f7902f299b
Push/Pop only allows saving and restoring operation state in a stack-like manner. We're going to need restoring arbitrary state for implementing deferred operations. Generalize state save/restore and implement Push and Pop on top of that. Signed-off-by: Elias Naur <mail@eliasnaur.com>
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package ops
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import (
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"encoding/binary"
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"math"
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"gioui.org/f32"
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"gioui.org/internal/opconst"
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)
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const QuadSize = 4 * 2 * 3
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type Quad struct {
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From, Ctrl, To f32.Point
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}
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func (q Quad) Transform(t f32.Affine2D) Quad {
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q.From = t.Transform(q.From)
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q.Ctrl = t.Transform(q.Ctrl)
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q.To = t.Transform(q.To)
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return q
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}
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func EncodeQuad(d []byte, q Quad) {
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d = d[:24]
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bo := binary.LittleEndian
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bo.PutUint32(d[0:], math.Float32bits(q.From.X))
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bo.PutUint32(d[4:], math.Float32bits(q.From.Y))
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bo.PutUint32(d[8:], math.Float32bits(q.Ctrl.X))
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bo.PutUint32(d[12:], math.Float32bits(q.Ctrl.Y))
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bo.PutUint32(d[16:], math.Float32bits(q.To.X))
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bo.PutUint32(d[20:], math.Float32bits(q.To.Y))
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}
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func DecodeQuad(d []byte) (q Quad) {
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d = d[:24]
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bo := binary.LittleEndian
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q.From.X = math.Float32frombits(bo.Uint32(d[0:]))
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q.From.Y = math.Float32frombits(bo.Uint32(d[4:]))
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q.Ctrl.X = math.Float32frombits(bo.Uint32(d[8:]))
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q.Ctrl.Y = math.Float32frombits(bo.Uint32(d[12:]))
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q.To.X = math.Float32frombits(bo.Uint32(d[16:]))
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q.To.Y = math.Float32frombits(bo.Uint32(d[20:]))
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return
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}
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func DecodeTransform(data []byte) (t f32.Affine2D) {
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if opconst.OpType(data[0]) != opconst.TypeTransform {
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panic("invalid op")
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}
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data = data[1:]
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data = data[:4*6]
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bo := binary.LittleEndian
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a := math.Float32frombits(bo.Uint32(data))
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b := math.Float32frombits(bo.Uint32(data[4*1:]))
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c := math.Float32frombits(bo.Uint32(data[4*2:]))
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d := math.Float32frombits(bo.Uint32(data[4*3:]))
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e := math.Float32frombits(bo.Uint32(data[4*4:]))
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f := math.Float32frombits(bo.Uint32(data[4*5:]))
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return f32.NewAffine2D(a, b, c, d, e, f)
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}
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// DecodeSave decodes the state id of a save op.
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func DecodeSave(data []byte) int {
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if opconst.OpType(data[0]) != opconst.TypeSave {
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panic("invalid op")
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}
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bo := binary.LittleEndian
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return int(bo.Uint32(data[1:]))
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}
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// DecodeLoad decodes the state id of a restore op.
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func DecodeLoad(data []byte) int {
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if opconst.OpType(data[0]) != opconst.TypeLoad {
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panic("invalid op")
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}
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bo := binary.LittleEndian
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return int(bo.Uint32(data[1:]))
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}
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