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jsutil: Enable to specify length at Uint8ArrayToSlice

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This commit is contained in:
Hajime Hoshi 2020-12-15 01:09:40 +09:00
parent b40a9cf7a2
commit 146357c298
2 changed files with 11 additions and 6 deletions
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10
internal/graphicsdriver/opengl/context_js.go
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@ -201,10 +201,11 @@ func (c *context) framebufferPixels(f *framebuffer, width, height int) []byte {
c.bindFramebuffer(f.native)
p := jsutil.TemporaryUint8Array(4 * width * height)
l := 4 * width * height
p := jsutil.TemporaryUint8Array(l)
gl.Call("readPixels", 0, 0, width, height, gles.RGBA, gles.UNSIGNED_BYTE, p)
return jsutil.Uint8ArrayToSlice(p)
return jsutil.Uint8ArrayToSlice(p, l)
}
func (c *context) framebufferPixelsToBuffer(f *framebuffer, buffer buffer, width, height int) {
@ -574,8 +575,9 @@ func (c *context) replacePixelsWithPBO(buffer buffer, t textureNative, width, he
func (c *context) getBufferSubData(buffer buffer, width, height int) []byte {
gl := c.gl
gl.Call("bindBuffer", gles.PIXEL_UNPACK_BUFFER, buffer)
arr := jsutil.TemporaryUint8Array(4 * width * height)
l := 4 * width * height
arr := jsutil.TemporaryUint8Array(l)
gl.Call("getBufferSubData", gles.PIXEL_UNPACK_BUFFER, 0, arr)
gl.Call("bindBuffer", gles.PIXEL_UNPACK_BUFFER, 0)
return jsutil.Uint8ArrayToSlice(arr)
return jsutil.Uint8ArrayToSlice(arr, l)
}

7
internal/jsutil/slice_js.go
View File

@ -22,8 +22,11 @@ import (
"unsafe"
)
func Uint8ArrayToSlice(value js.Value) []byte {
s := make([]byte, value.Get("byteLength").Int())
func Uint8ArrayToSlice(value js.Value, length int) []byte {
if l := value.Get("byteLength").Int(); length > l {
length = l
}
s := make([]byte, length)
js.CopyBytesToGo(s, value)
return s
}