尝试在 Android 手机上使用 RenderScript 支持库模糊图像时出错

Question

我正在尝试模糊我的图像，并使用 RenderScript 在 RelativeLayout 的背景上显示它，该应用在模拟器中运行，但我在手机中的应用不断崩溃并出现此错误：

08-05 22:21:36.543：E/RenderScript_jni(11549)：没有 GC 方法 08-05 22:21:36.553: D/dalvikvm(11549): 在 /system/lib/libRSSupport.so 0x41803ab8 中找不到 JNI_OnLoad，跳过初始化 08-05 22:21:36.557: E/dalvikvm(11549): 错误: 找不到本地方法 08-05 22:21:36.557: E/dalvikvm(11549): 请求: Landroid/support/v8/renderscript/RenderScript;._nInit:()V 08-05 22:21:36.558：E/JNIHelp(11549)：“android/support/v8/renderscript/RenderScript”的 RegisterNatives 失败，正在中止 08-05 22:21:36.558：A/libc(11549)：致命信号 11 (SIGSEGV) 位于 0xdeadbaad (code=1)，线程 11549 (m.example.login)

这是我在一个单独的类上的模糊代码：

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v8.renderscript.*;

public class Blur {
    public static Bitmap blurBitmap(Context context, Bitmap src) {
        Bitmap outBitmap = src.copy(src.getConfig(), true);

        final RenderScript rs = RenderScript.create(context);
        final Allocation input = Allocation.createFromBitmap(rs, src);
        final Allocation output = Allocation.createFromBitmap(rs, outBitmap);

        final ScriptIntrinsicBlur script =
                ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        script.setRadius(25f);
        script.setInput(input);
        script.forEach(output);
        output.copyTo(outBitmap);

        rs.destroy();

        return outBitmap;
    }
}

这是 MainActivity 中的任何代码（我从图库中获取位图）：

Uri selectedImageUri = data.getData();
Blur blur = new Blur();
imagepath = getRealPathFromURI(selectedImageUri);
Bitmap bmImg = BitmapFactory.decodeFile(imagepath);
Bitmap BlurredIMG = Blur.blurBitmap(getApplicationContext(), bmImg);
BitmapDrawable background = new BitmapDrawable(BlurredIMG);
rl.setBackgroundDrawable(background);

Answer 1

我有同样的问题。经过数小时的研究，我发现了另一个solution。如果在垂直和水平方向预先缩放图像然后应用此算法，它的工作速度非常快（大约 10-15 毫秒）。
我的解决方案是这样的

//here we scale bitmap and apply blur
private Bitmap blur(Bitmap bkg) {

            float scaleFactor = 8;
            int radius = 2;
            int inputWidth = bkg.getWidth();
            int inputHeight = bkg.getHeight();

            Bitmap overlay = Bitmap.createBitmap((int)(inputWidth/scaleFactor),(int)(inputHeight/scaleFactor), Bitmap.Config.ARGB_8888);

            Canvas canvas = new Canvas(overlay);

            canvas.scale(1 / scaleFactor, 1 / scaleFactor);
            Paint paint = new Paint();
            paint.setFlags(Paint.FILTER_BITMAP_FLAG);

            canvas.drawBitmap(bkg, 0, 0, paint);

            //  bkg.recycle();
            overlay = FastBlur.doBlur(overlay, radius, true);
            return getResizedBitmap(overlay, inputWidth, inputHeight, true);

        }


        public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth, boolean willDelete) {

            int width = bm.getWidth();

            int height = bm.getHeight();

            float scaleWidth = ((float) newWidth) / width;

            float scaleHeight = ((float) newHeight) / height;

            // CREATE A MATRIX FOR THE MANIPULATION

            Matrix matrix = new Matrix();

            // RESIZE THE BIT MAP

            matrix.postScale(scaleWidth, scaleHeight);

            // RECREATE THE NEW BITMAP

            Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);

            //          if(willDelete)
            //              bm.recycle();

            return resizedBitmap;
        }

最后这是我的类，它包含了模糊算法

public class FastBlur {

    public static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {

        // Stack Blur v1.0 from
        // http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
        //
        // Java Author: Mario Klingemann <mario at quasimondo.com>
        // http://incubator.quasimondo.com
        // created Feburary 29, 2004
        // Android port : Yahel Bouaziz <yahel at kayenko.com>
        // http://www.kayenko.com
        // ported april 5th, 2012

        // This is a compromise between Gaussian Blur and Box blur
        // It creates much better looking blurs than Box Blur, but is
        // 7x faster than my Gaussian Blur implementation.
        //
        // I called it Stack Blur because this describes best how this
        // filter works internally: it creates a kind of moving stack
        // of colors whilst scanning through the image. Thereby it
        // just has to add one new block of color to the right side
        // of the stack and remove the leftmost color. The remaining
        // colors on the topmost layer of the stack are either added on
        // or reduced by one, depending on if they are on the right or
        // on the left side of the stack.
        //
        // If you are using this algorithm in your code please add
        // the following line:
        //
        // Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>

        Bitmap bitmap;
        if (canReuseInBitmap) {
            bitmap = sentBitmap;
        } else {
            bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
        }

        if (radius < 1) {
            return (null);
        }

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        int[] pix = new int[w * h];
        bitmap.getPixels(pix, 0, w, 0, 0, w, h);

        int wm = w - 1;
        int hm = h - 1;
        int wh = w * h;
        int div = radius + radius + 1;

        int r[] = new int[wh];
        int g[] = new int[wh];
        int b[] = new int[wh];
        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
        int vmin[] = new int[Math.max(w, h)];

        int divsum = (div + 1) >> 1;
        divsum *= divsum;
        int dv[] = new int[256 * divsum];
        for (i = 0; i < 256 * divsum; i++) {
            dv[i] = (i / divsum);
        }

        yw = yi = 0;

        int[][] stack = new int[div][3];
        int stackpointer;
        int stackstart;
        int[] sir;
        int rbs;
        int r1 = radius + 1;
        int routsum, goutsum, boutsum;
        int rinsum, ginsum, binsum;

        for (y = 0; y < h; y++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            for (i = -radius; i <= radius; i++) {
                p = pix[yi + Math.min(wm, Math.max(i, 0))];
                sir = stack[i + radius];
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rbs = r1 - Math.abs(i);
                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
            }
            stackpointer = radius;

            for (x = 0; x < w; x++) {

                r[yi] = dv[rsum];
                g[yi] = dv[gsum];
                b[yi] = dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (y == 0) {
                    vmin[x] = Math.min(x + radius + 1, wm);
                }
                p = pix[yw + vmin[x]];

                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[(stackpointer) % div];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi++;
            }
            yw += w;
        }
        for (x = 0; x < w; x++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            yp = -radius * w;
            for (i = -radius; i <= radius; i++) {
                yi = Math.max(0, yp) + x;

                sir = stack[i + radius];

                sir[0] = r[yi];
                sir[1] = g[yi];
                sir[2] = b[yi];

                rbs = r1 - Math.abs(i);

                rsum += r[yi] * rbs;
                gsum += g[yi] * rbs;
                bsum += b[yi] * rbs;

                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }

                if (i < hm) {
                    yp += w;
                }
            }
            yi = x;
            stackpointer = radius;
            for (y = 0; y < h; y++) {
                // Preserve alpha channel: ( 0xff000000 & pix[yi] )
                pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (x == 0) {
                    vmin[y] = Math.min(y + r1, hm) * w;
                }
                p = x + vmin[y];

                sir[0] = r[p];
                sir[1] = g[p];
                sir[2] = b[p];

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[stackpointer];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi += w;
            }
        }

        bitmap.setPixels(pix, 0, w, 0, 0, w, h);

        return (bitmap);
    }

}

致以最诚挚的问候

Answer 2

检查您的 build.gradle 文件 (Android Studio) 或 project.properties (Eclipse)。这听起来像您没有将其设置为正确包含 RS 支持模式和目标 API 级别。在这里查看答案：android can't load SupportV8 RenderScript in api <17

Answer 3

这段代码非常适合我。

并且 setRadius 介于 0 到 23 之间。

像“blur.setRadius(21)”

Bitmap tempbg = BitmapFactory.decodeResource(getResources(),R.drawable.b1); //Load a  background.
Bitmap final_Bitmap = BlurImage(tempbg);

@SuppressLint("NewApi")
Bitmap BlurImage (Bitmap input)
{
    try
    {
    RenderScript  rsScript = RenderScript.create(getApplicationContext());
    Allocation alloc = Allocation.createFromBitmap(rsScript, input);

    ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(rsScript, Element.U8_4(rsScript));
    blur.setRadius(21);
    blur.setInput(alloc);

    Bitmap result = Bitmap.createBitmap(input.getWidth(), input.getHeight(), Bitmap.Config.ARGB_8888);
    Allocation outAlloc = Allocation.createFromBitmap(rsScript, result);

    blur.forEach(outAlloc);
    outAlloc.copyTo(result);

    rsScript.destroy();
    return result;
    }
    catch (Exception e) {
        // TODO: handle exception
        return input;
    }

}