import com.badlogic.gdx.graphics.Pixmap;
public class Blur {
public static void blurImage(int radius, Pixmap pixmap, int width,
int height, int rectx, int recty, int rectw, int recth) {
int w = pixmap.getWidth();
int h = pixmap.getHeight();
int xoffset = 0;
int yoffset = 0;
if (width > w) {
width = w;
}
if (height > h) {
height = h;
}
w = width;
h = height;
if (rectx > width) {
rectx = 0;
}
if (recty > height) {
recty = 0;
}
if (rectx + rectw > width) {
rectw = width - rectx;
}
if (recty + recth > height) {
recth = height - recty;
}
xoffset = rectx;
yoffset = recty;
w = rectw;
h = recth;
// mwxx red border around
//pixmap.setColor(1, 0, 0, 1);
pixmap.drawRectangle(xoffset, yoffset, 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[(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++) {
int index = yi + Math.min(wm, (int) Math.max(i, 0));
int yy = (int) (index / w);
int xx = (int) (index % h);
// 32-bit RGBA8888
p = pixmap.getPixel(xx + xoffset, yy + yoffset);
int mask = p & 0xFFFFFFFF;
int rr = (mask >> 24) & 0xff;
int gg = (mask >> 16) & 0xff;
int bb = (mask >> 8) & 0xff;
sir = stack[i + radius];
sir[0] = rr;
sir[1] = gg;
sir[2] = bb;
rbs = r1 - (int) 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);
}
int index = yw + vmin[x];
int yy = (int) (index / w);
int xx = (int) (index % h);
// 32-bit RGBA8888
p = pixmap.getPixel(xx + xoffset, yy + yoffset);
int mask = p & 0xFFFFFFFF;
int rr = (mask >> 24) & 0xff;
int gg = (mask >> 16) & 0xff;
int bb = (mask >> 8) & 0xff;
sir[0] = rr;
sir[1] = gg;
sir[2] = bb;
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 = (int) Math.max(0, yp) + x;
sir = stack[i + radius];
sir[0] = r[yi];
sir[1] = g[yi];
sir[2] = b[yi];
rbs = r1 - (int) 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++) {
int rr = dv[rsum];
int gg = dv[gsum];
int bb = dv[bsum];
pixmap.setColor(rr / 255f, gg / 255f, bb / 255f, 1f);
int yy = (int) (yi / w);
int xx = (int) (yi % h);
pixmap.drawPixel(xx + xoffset, yy + yoffset);
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;
}
}
}
}