模糊工具类

文章目录

https://github.com/SeniorZhai/BlurAndroid

public class Blur{
	private static final String TAG = "Blur";

	public static Bitmap fastblur(Context context,Bitmap sentBitmap,int radius) {
		if (VERSION.SDK_INT > 16) {
			Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(),true);
			final RenderScript rs = RenderScript.create(context);
			final Allocation input = Allocation.createFromBitmap(rs,sentBitmap,Allocation.MipmapControl.MIPMAP_NONE,Allocation.USAGE_SCRIPT);
			final Allocation output = Allocation.createTyped(rs,input.getType());
			final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs,Element.U8_4(rs));
			script.setRadius(radius);
			script.setInput(input);
			script.forEach(output);
			output.copyTo(Bitmap);
			return bitmap;
		}

		Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(),true);
		if (radius < 1) {
			return (null);
		}

		int w = bitmap.getWith();
		int h = bitmap.getHight();

		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 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++) {
			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);
	}
}