forked from joejulian/gio
Egon Elbre
f39245df99
It's relatively common to create a widget and then add a background to
it. Using layout.Stack causes bunch of heap allocs, which we would like
to avoid whenever we can.
This adds layout.Background which is roughly the same as:
layout.Stack{Alignment: layout.C}.Layout(gtx,
layout.Expanded(background),
layout.Stacked(widget)
)
goos: windows
goarch: amd64
pkg: gioui.org/layout
cpu: AMD Ryzen Threadripper 2950X 16-Core Processor
│ Stack │ Background │
│ sec/op │ sec/op vs base │
*-32 203.80n ± 1% 83.36n ± 3% -59.09% (p=0.000 n=10)
│ Stack │ Background │
│ B/op │ B/op vs base │
*-32 48.00 ± 0% 0.00 ± 0% -100.00% (p=0.000 n=10)
│ Stack │ Background │
│ allocs/op │ allocs/op vs base │
*-32 2.000 ± 0% 0.000 ± 0% -100.00% (p=0.000 n=10)
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
67 lines
1.0 KiB
Go
67 lines
1.0 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package layout
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import (
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"image"
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"testing"
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"gioui.org/op"
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)
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func BenchmarkStack(b *testing.B) {
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gtx := Context{
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Ops: new(op.Ops),
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Constraints: Constraints{
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Max: image.Point{X: 100, Y: 100},
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},
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}
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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gtx.Ops.Reset()
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Stack{}.Layout(gtx,
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Expanded(emptyWidget{
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Size: image.Point{X: 60, Y: 60},
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}.Layout),
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Stacked(emptyWidget{
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Size: image.Point{X: 30, Y: 30},
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}.Layout),
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)
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}
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}
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func BenchmarkBackground(b *testing.B) {
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gtx := Context{
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Ops: new(op.Ops),
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Constraints: Constraints{
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Max: image.Point{X: 100, Y: 100},
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},
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}
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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gtx.Ops.Reset()
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Background{}.Layout(gtx,
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emptyWidget{
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Size: image.Point{X: 60, Y: 60},
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}.Layout,
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emptyWidget{
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Size: image.Point{X: 30, Y: 30},
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}.Layout,
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)
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}
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}
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type emptyWidget struct {
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Size image.Point
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}
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func (w emptyWidget) Layout(gtx Context) Dimensions {
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return Dimensions{Size: w.Size}
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}
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