Android 高斯模糊頭像

    本人圖片加載用了Glide，模糊用了一個git上面的效果，叫Fglass,整體來講還能夠，效果圖以下：

下面開始個人代碼了：（獲取到圖片路徑，用Glide）

Glide.with(mcontext).load(url).asBitmap().error(R.drawable.pic_nologinbg).into(new SimpleTarget<Bitmap>() {
    @Override
    public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
        iv_head.setImageBitmap(resource);
        Fglass.blur(resource,rt_headbg,4,12);
    }
});

下面是Fglass的工具類

public class Fglass {

    //第一次設置的是吧不顯示，因此放棄了
    /**
     * 設置高斯模糊
     *
     * ps:
     * 設置高斯模糊是依靠scaleFactor和radius配合使用的，好比這裏默認設置是：scaleFactor = 8;radius = 2; 模糊效果和scaleFactor = 1;radius = 20;是同樣的，並且效率高
     * @param toView 高斯模糊設置到某個View上
     * @param radius 模糊度
     * @param scaleFactor 縮放比例
     */
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    public static void blur(Bitmap bkg, View toView,float radius,float scaleFactor) {
        //獲取View的截圖
//        Bitmap b = Bitmap.createBitmap(fromView.getWidth(),fromView.getHeight(),Bitmap.Config.ARGB_8888);
//        Drawable drawable = fromView.getDrawable();
//        Bitmap bkg = ((BitmapDrawable) drawable).getBitmap();
//        fromView.buildDrawingCache();
//        Bitmap bkg = fromView.getDrawingCache();
        int width = bkg.getWidth();
        int height = bkg.getHeight();
        int newWidth = toView.getMeasuredWidth();
        int newHeight = toView.getMeasuredHeight();
        float scaleWidth = ((float)newWidth)/width;
        float scaleHeight = ((float)newHeight)/height;
        //縮放的matrix參數
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth,scaleHeight);

        if (radius<1||radius>26) {
            scaleFactor = 8;
            radius = 2;
        }
        Bitmap overlay = Bitmap.createBitmap((int) (toView.getMeasuredWidth()/scaleFactor),
                (int) (toView.getMeasuredHeight()/scaleFactor), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(overlay);
        canvas.translate(-toView.getLeft()/scaleFactor, -toView.getTop()/scaleFactor);
        canvas.scale(1 / scaleFactor, 1 / scaleFactor);
        Paint paint = new Paint();
        paint.setFlags(Paint.FILTER_BITMAP_FLAG);

        bkg = Bitmap.createBitmap(bkg,0,0,width,height,matrix,true);
        canvas.drawBitmap(bkg, 0, 0, paint);

        overlay = Fglass.doBlur(overlay, (int) radius, true);
        toView.setBackground(new BitmapDrawable(overlay));
    }

    /**
     * 高斯模糊操做
     * @param sentBitmap
     * @param radius
     * @param canReuseInBitmap
     * @return
     */
    public static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {
        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);
    }
}

ok了，效果就出來了。