到目前为止我尝试过的：
将每一帧转换为位图，然后用library https://github.com/wasabeef/Blurry并将其放入ImageView这是在相机预览前。显然太慢了 - 就像1 fps.
然后我开始使用渲染脚本这会模糊每一帧，处理结果应该放在TextureView这是封面相机预览。
该方法的基本代码片段：
模糊滤镜
ScriptIntrinsicBlur.create(rs, Element.RGBA_8888(rs)).apply {
setRadius(BLUR_RADIUS)
}
private val yuvToRgb = ScriptIntrinsicYuvToRGB.create(rs, Element.RGBA_8888(rs))
private var surface: SurfaceTexture? = null
private fun setupSurface() {
if (surface != null) {
aBlurOut?.surface = Surface(surface)
}
}
fun reset(width: Int, height: Int) {
aBlurOut?.destroy()
this.width = width
this.height = height
val tbConvIn = Type.Builder(rs, Element.U8(rs))
.setX(width)
.setY(height)
.setYuvFormat(android.graphics.ImageFormat.NV21)
aConvIn = Allocation.createTyped(rs, tbConvIn.create(), Allocation.USAGE_SCRIPT)
val tbConvOut = Type.Builder(rs, Element.RGBA_8888(rs))
.setX(width)
.setY(height)
aConvOut = Allocation.createTyped(rs, tbConvOut.create(), Allocation.USAGE_SCRIPT)
val tbBlurOut = Type.Builder(rs, Element.RGBA_8888(rs))
.setX(width)
.setY(height)
aBlurOut = Allocation.createTyped(rs, tbBlurOut.create(),
Allocation.USAGE_SCRIPT or Allocation.USAGE_IO_OUTPUT)
setupSurface()
}
fun execute(yuv: ByteArray) {
if (surface != null) {
//YUV -> RGB
aConvIn!!.copyFrom(yuv)
yuvToRgb.setInput(aConvIn)
yuvToRgb.forEach(aConvOut)
//RGB -> BLURED RGB
blurRc.setInput(aConvOut)
blurRc.forEach(aBlurOut)
aBlurOut!!.ioSend()
}
}
主要活动
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
initQrScanner()
}
override fun onStart() {
super.onStart()
fotoapparat.start()
}
override fun onStop() {
fotoapparat.stop()
super.onStop()
}
private fun initQrScanner() {
val filter = BlurFilter(RenderScript.create(this))
tvWholeOverlay.surfaceTextureListener = filter
fotoapparat = Fotoapparat
.with(this)
.into(cvQrScanner)
.frameProcessor({
if (it.size.width != filter.width || it.size.height != filter.height) {
filter.reset(it.size.width, it.size.height)
}
filter.execute(it.image)
})
.build()
}
活动主文件
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.blur.andrey.blurtest.MainActivity">
<io.fotoapparat.view.CameraView
android:id="@+id/cvQrScanner"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextureView
android:id="@+id/tvWholeOverlay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
不幸的是它仍然很慢 -3-4 FPS。模糊叠加也被旋转，但这是另一个问题。
我已经创建了Github 上的测试项目 https://github.com/kidinov/BlurTest您可以在其中快速重现问题并检查如何优化。期待您的想法。
UPD我能够通过在模糊之前缩小输入日期来提高性能。我将这些更改推送到测试仓库。现在我已经很好了（15-20 帧/秒）即使在低端设备上也能表现出色，但分辨率较低（例如高清），并且在 FHD 和 UHD 上也不够好（（8-12 帧/秒）.
