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jsutil: Avoid allocating ArrayBuffer unnecessarily
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@ -96,44 +96,56 @@ func sliceToByteSlice(s interface{}) (bs []byte) {
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return
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return
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}
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}
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var temporaryBuffer = js.Global().Get("ArrayBuffer").New(16)
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func getTemporaryUint8Array(size int) js.Value {
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if l := temporaryBuffer.Get("byteLength").Int(); l < size {
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for l < size {
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l *= 2
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}
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temporaryBuffer = js.Global().Get("ArrayBuffer").New(l)
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}
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return js.Global().Get("Uint8Array").New(temporaryBuffer, 0, size)
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}
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func SliceToTypedArray(s interface{}) (js.Value, func()) {
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func SliceToTypedArray(s interface{}) (js.Value, func()) {
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switch s := s.(type) {
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switch s := s.(type) {
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case []int8:
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case []int8:
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a := js.Global().Get("Uint8Array").New(len(s))
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a := getTemporaryUint8Array(len(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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buf := a.Get("buffer")
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buf := a.Get("buffer")
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return js.Global().Get("Int8Array").New(buf, a.Get("byteOffset"), a.Get("byteLength")), func() {}
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return js.Global().Get("Int8Array").New(buf, a.Get("byteOffset"), a.Get("byteLength")), func() {}
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case []int16:
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case []int16:
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a := js.Global().Get("Uint8Array").New(len(s) * 2)
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a := getTemporaryUint8Array(len(s) * 2)
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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buf := a.Get("buffer")
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buf := a.Get("buffer")
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return js.Global().Get("Int16Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/2), func() {}
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return js.Global().Get("Int16Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/2), func() {}
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case []int32:
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case []int32:
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a := js.Global().Get("Uint8Array").New(len(s) * 4)
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a := getTemporaryUint8Array(len(s) * 4)
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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buf := a.Get("buffer")
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buf := a.Get("buffer")
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return js.Global().Get("Int32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
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return js.Global().Get("Int32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
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case []uint8:
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case []uint8:
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a := js.Global().Get("Uint8Array").New(len(s))
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a := getTemporaryUint8Array(len(s))
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js.CopyBytesToJS(a, s)
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js.CopyBytesToJS(a, s)
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return a, func() {}
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return a, func() {}
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case []uint16:
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case []uint16:
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a := js.Global().Get("Uint8Array").New(len(s) * 2)
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a := getTemporaryUint8Array(len(s) * 2)
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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buf := a.Get("buffer")
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buf := a.Get("buffer")
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return js.Global().Get("Uint16Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/2), func() {}
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return js.Global().Get("Uint16Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/2), func() {}
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case []uint32:
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case []uint32:
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a := js.Global().Get("Uint8Array").New(len(s) * 4)
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a := getTemporaryUint8Array(len(s) * 4)
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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buf := a.Get("buffer")
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buf := a.Get("buffer")
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return js.Global().Get("Uint32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
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return js.Global().Get("Uint32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
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case []float32:
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case []float32:
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a := js.Global().Get("Uint8Array").New(len(s) * 4)
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a := getTemporaryUint8Array(len(s) * 4)
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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buf := a.Get("buffer")
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buf := a.Get("buffer")
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return js.Global().Get("Float32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
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return js.Global().Get("Float32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
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case []float64:
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case []float64:
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a := js.Global().Get("Uint8Array").New(len(s) * 8)
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a := getTemporaryUint8Array(len(s) * 8)
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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js.CopyBytesToJS(a, sliceToByteSlice(s))
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buf := a.Get("buffer")
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buf := a.Get("buffer")
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return js.Global().Get("Float64Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/8), func() {}
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return js.Global().Get("Float64Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/8), func() {}
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