Question

我尝试使用RenderScript来模糊图像并且它可以正常工作。我想知道RenderScript如何用于模糊部分图像。我试过下面的代码，但它不起作用：

 Bitmap overlay = Bitmap.createBitmap(
            mWidth,
            mHeight,
            Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(overlay);

    canvas.drawBitmap(bitmap, -mletf,
            -mTop, null);

    RenderScript rs = RenderScript.create(mContext);

    Allocation overlayAlloc = Allocation.createFromBitmap(
            rs, overlay);

    ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(
            rs, overlayAlloc.getElement());

    blur.setInput(overlayAlloc);

    blur.setRadius(mRadius);

    blur.forEach(overlayAlloc);

    overlayAlloc.copyTo(overlay);




    rs.destroy();
    return  overlay;

变量mHeight，mWidth是要模糊的部分的高度和宽度，mTop，mletf是模糊开始的地方。

Answer 1

使用LaunchOptions API：

LaunchOptions lo = new LaunchOptions();
lo.setX(mLeft, mLeft+mWidth);
lo.setY(mTop, mTop+mHeight);

blur.forEach(overlayAlloc, lo);

Answer 2

使用此库enter link description here

和

defaultConfig {
applicationId "com.javatechig"
minSdkVersion 14
targetSdkVersion 23
versionCode 1
versionName "1.0"

// Add the following two lines
renderscriptTargetApi 18
renderscriptSupportModeEnabled true

}

以下代码段可用于使用RenderScript API在Android中创建位图模糊效果。

//Set the radius of the Blur. Supported range 0 < radius <= 25
private static final float BLUR_RADIUS = 25f;

public Bitmap blur(Bitmap image) {
    if (null == image) return null;

    Bitmap outputBitmap = Bitmap.createBitmap(image);
    final RenderScript renderScript = RenderScript.create(this);
    Allocation tmpIn = Allocation.createFromBitmap(renderScript, image);
    Allocation tmpOut = Allocation.createFromBitmap(renderScript, outputBitmap);

    //Intrinsic Gausian blur filter
    ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));
    theIntrinsic.setRadius(BLUR_RADIUS);
    theIntrinsic.setInput(tmpIn);
    theIntrinsic.forEach(tmpOut);
    tmpOut.copyTo(outputBitmap);
    return outputBitmap;
}

您可以使用上面的代码段来模糊ImageView，如下所示。

ImageView imageView = (ImageView) findViewById(R.id.imageView);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.nature);
Bitmap blurredBitmap = blur(bitmap);
imageView.setImageBitmap(blurredBitmap);

请点击此链接enter link description here

模糊部分图像

2 个答案: