图片高斯模糊

blurBitmap.java

/**
     * Blur a bitmap by specified radius
     * @param context
     * @param src
     * @param radius
     * @return
     */
    public static Bitmap blurBitmap(Context context, Bitmap src, float radius)
            throws RSIllegalArgumentException {
        if (radius <= 0f) {
            return src;
        } else if (radius > 25f) {
            throw new RSIllegalArgumentException("Radius out of range (0 < r <= 25).");
        }
        MyLog.d(TAG, "bitmap width: "+src.getWidth()+"bitmap height: "+src.getHeight());
        Bitmap bluredBitmap = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig());
        RenderScript renderScript = RenderScript.create(context);
        ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(renderScript,
                Element.U8_4(renderScript));
        Allocation memorySrc = Allocation.createFromBitmap(renderScript, src);
        Allocation memoryBlur = Allocation.createFromBitmap(renderScript, bluredBitmap);

        blurScript.setRadius(radius);
        blurScript.setInput(memorySrc);
        blurScript.forEach(memoryBlur);
        memoryBlur.copyTo(bluredBitmap);
        renderScript.destroy();

        return bluredBitmap;
    }