android 使用 Renderscript 模糊的问题

Issues with android blur using Renderscript

我正在使用以下代码为我的 imageview 构建模糊背景。

public class BlurBuilder {
    private static final float BITMAP_SCALE = 0.2f;
    private static final float BLUR_RADIUS = 25f;

    public static Bitmap blur(Context context, Bitmap image) {
        int width = Math.round(image.getWidth() * BITMAP_SCALE);
        int height = Math.round(image.getHeight() * BITMAP_SCALE);

        Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
        Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);

        RenderScript rs = RenderScript.create(context);
        ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
        Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
        theIntrinsic.setRadius(BLUR_RADIUS);
        theIntrinsic.setInput(tmpIn);
        theIntrinsic.forEach(tmpOut);
        tmpOut.copyTo(outputBitmap);

        return outputBitmap;
    }
}

Blur 在大多数情况下构建良好,但随着时间的推移会变得糟糕,最终我的应用程序崩溃而没有任何崩溃日志。在模拟器 运行 上,经过严格测试后,我看到以下错误:

09-01 15:05:03.230 4624-9758/? E/RenderScript: rsAssert failed: ret == bytes || mShutdown, in frameworks/rs/rsFifoSocket.cpp at 83
09-01 15:05:03.238 4624-9781/? E/RenderScript: rsAssert failed: ret == bytes || mShutdown, in frameworks/rs/rsFifoSocket.cpp at 83
09-01 15:05:03.242 4624-10128/? E/RenderScript: rsAssert failed: ret == bytes || mShutdown, in frameworks/rs/rsFifoSocket.cpp at 83
09-01 15:05:03.242 4624-9610/? E/RenderScript: rsAssert failed: ret == bytes || mShutdown, in frameworks/rs/rsFifoSocket.cpp at 83
09-01 15:05:03.242 4624-9781/? E/RenderScript: rsAssert failed: ret == bytes || mShutdown, in frameworks/rs/rsFifoSocket.cpp at 83
09-01 15:05:03.250 4624-9767/? E/RenderScript: rsAssert failed: ret == bytes || mShutdown, in frameworks/rs/rsFifoSocket.cpp at 83
09-01 15:05:03.254 4624-9758/? E/RenderScript: rsAssert failed: ret == bytes || mShutdown, in frameworks/rs/rsFifoSocket.cpp at 83
... (same error - many more times and then crash)

我有以下这方面的疑问:

  1. 我正在为渲染脚本使用以下 gradle 配置:

    compileSdkVersion 23 buildToolsVersion "23.0.3"

    默认配置{ 应用程序 ID "package " minSdkVersion 19 targetSdk版本 23 multiDexEnabled 真 renderscriptTargetApi 19 renderscriptSupportModeEnabled 真 }

renderscript 库的推荐版本是什么? 我应该从 android.support.v8.renderscript.Allocation orandroid.renderscript` 包中导入依赖项吗?

  1. 不使用 renderscript 库可以实现模糊效果吗?

经过一天多的时间,我明白了以下几点:

  1. 应用程序崩溃,因为 Renderscript 库抛出异常。这通常发生在处理能力低的设备中。此异常不是 Java 异常,无法捕获。

  2. 使用以下代码作为另一种方式来发出模糊(不使用 renderscript 库):

    public static Bitmap fastblur(Bitmap sentBitmap) {
    
    int radius = (int) BLUR_RADIUS;
    
    int width = Math.round(sentBitmap.getWidth() * BITMAP_SCALE);
    int height = Math.round(sentBitmap.getHeight() * BITMAP_SCALE);
    sentBitmap = Bitmap.createScaledBitmap(sentBitmap, width, height, false);
    
    Bitmap 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];
    Log.e("pix", w + " " + h + " " + pix.length);
    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;
        }
    }
    
    Log.e("pix", w + " " + h + " " + pix.length);
    bitmap.setPixels(pix, 0, w, 0, 0, w, h);
    
    return (bitmap);
    }