mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
// Copyright 2019 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package jsutil
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import (
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"fmt"
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"reflect"
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"runtime"
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"syscall/js"
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"unsafe"
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)
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func Uint8ArrayToSlice(value js.Value, length int) []byte {
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if l := value.Get("byteLength").Int(); length > l {
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length = l
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}
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s := make([]byte, length)
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js.CopyBytesToGo(s, value)
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return s
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}
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func sliceToByteSlice(s interface{}) (bs []byte) {
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switch s := s.(type) {
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case []int8:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []int16:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 2
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h.Cap *= 2
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []int32:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 4
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h.Cap *= 4
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []int64:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 8
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h.Cap *= 8
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []uint8:
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return s
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case []uint16:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 2
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h.Cap *= 2
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []uint32:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 4
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h.Cap *= 4
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []uint64:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 8
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h.Cap *= 8
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []float32:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 4
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h.Cap *= 4
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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case []float64:
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 8
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h.Cap *= 8
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bs = *(*[]byte)(unsafe.Pointer(h))
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runtime.KeepAlive(s)
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default:
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panic(fmt.Sprintf("jsutil: unexpected value at sliceToBytesSlice: %T", s))
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}
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return
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}
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func copySliceToTemporaryArrayBuffer(src interface{}) {
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switch s := src.(type) {
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case []uint8:
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js.CopyBytesToJS(temporaryUint8Array, s)
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case []int8, []int16, []int32, []uint16, []uint32, []float32, []float64:
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js.CopyBytesToJS(temporaryUint8Array, sliceToByteSlice(s))
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default:
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panic(fmt.Sprintf("jsutil: unexpected value at CopySliceToJS: %T", s))
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}
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}
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