mirror of
https://git.sr.ht/~eliasnaur/gio
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Dominik Honnef
b4d93379c4
When storing a string in an interface value that escapes, Go has to heap allocate space for the string header, as interface values can only store pointers. In text-heavy applications, this can lead to hundreds of allocations per frame due to semantic.LabelOp, the primary user of string-typed references in ops. Instead of allocating each string header individually, provide a slice of strings to store string-typed references in, and store pointers into this slice as the actual references. This only allocates when resizing the slice's backing array, and averages out to no allocations, as the backing array gets reused between calls to Ops.Reset. We introduce two new functions, Write1String and Write2String, which make use of this new slice for their last argument. We could've automated this in the existing Write1 and Write2 methods, but that would require type assertions on each call, and the vast majority of ops do not make use of strings. Signed-off-by: Dominik Honnef <dominik@honnef.co>
38 lines
784 B
Go
38 lines
784 B
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package clipboard
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import (
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"gioui.org/internal/ops"
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"gioui.org/io/event"
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"gioui.org/op"
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)
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// Event is generated when the clipboard content is requested.
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type Event struct {
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Text string
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}
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// ReadOp requests the text of the clipboard, delivered to
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// the current handler through an Event.
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type ReadOp struct {
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Tag event.Tag
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}
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// WriteOp copies Text to the clipboard.
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type WriteOp struct {
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Text string
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}
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func (h ReadOp) Add(o *op.Ops) {
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data := ops.Write1(&o.Internal, ops.TypeClipboardReadLen, h.Tag)
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data[0] = byte(ops.TypeClipboardRead)
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}
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func (h WriteOp) Add(o *op.Ops) {
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data := ops.Write1String(&o.Internal, ops.TypeClipboardWriteLen, h.Text)
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data[0] = byte(ops.TypeClipboardWrite)
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}
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func (Event) ImplementsEvent() {}
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