From 66aa881b0c4e349f9cd59e5e2c35c20f10387979 Mon Sep 17 00:00:00 2001
From: wizjany <wizjany@gmail.com>
Date: Fri, 6 Jan 2017 19:00:29 -0500
Subject: [PATCH] Copy Kernel class to WorldEdit to avoid loading AWT.

Java 8's Kernel statically loads the AWT library, which
can apparently cause some issues on some systems, for some reason.

Either way, there is no need to load AWT if it's not needed (Java pls).
---
 .../math/convolution/GaussianKernel.java      |  2 -
 .../math/convolution/HeightMapFilter.java     |  2 -
 .../worldedit/math/convolution/Kernel.java    | 75 +++++++++++++++++++
 .../math/convolution/LinearKernel.java        |  2 -
 4 files changed, 75 insertions(+), 6 deletions(-)
 create mode 100644 worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/Kernel.java

diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/GaussianKernel.java b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/GaussianKernel.java
index bc8b647f7..bb38201d2 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/GaussianKernel.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/GaussianKernel.java
@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.math.convolution;
 
-import java.awt.image.Kernel;
-
 /**
  * A Gaussian Kernel generator (2D bellcurve).
  */
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/HeightMapFilter.java b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/HeightMapFilter.java
index 93f4f7c06..f58899fb4 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/HeightMapFilter.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/HeightMapFilter.java
@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.math.convolution;
 
-import java.awt.image.Kernel;
-
 import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/Kernel.java b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/Kernel.java
new file mode 100644
index 000000000..efc051b63
--- /dev/null
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/Kernel.java
@@ -0,0 +1,75 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.math.convolution;
+
+/*
+ * This class was originally part of the JDK, java.awt.image.Kernel,
+ * and has been modified to not load the entire AWT toolkit, since
+ * that was apparently added in Java 8, even though this class
+ * is completely standalone.
+ */
+public class Kernel {
+
+    private int width;
+    private int height;
+    private int xOrigin;
+    private int yOrigin;
+    private float[] data;
+
+    public Kernel(int width, int height, float[] data) {
+        this.width = width;
+        this.height = height;
+        this.xOrigin = (width - 1) >> 1;
+        this.yOrigin = (height - 1) >> 1;
+        int len = width * height;
+        if (data.length < len) {
+            throw new IllegalArgumentException("Data array too small (is " + data.length + " and should be " + len);
+        }
+        this.data = new float[len];
+        System.arraycopy(data, 0, this.data, 0, len);
+    }
+
+    public final int getXOrigin() {
+        return xOrigin;
+    }
+
+    public final int getYOrigin() {
+        return yOrigin;
+    }
+
+    public final int getWidth() {
+        return width;
+    }
+
+    public final int getHeight() {
+        return height;
+    }
+
+    public final float[] getKernelData(float[] data) {
+        if (data == null) {
+            data = new float[this.data.length];
+        } else if (data.length < this.data.length) {
+            throw new IllegalArgumentException("Data array too small (should be " + this.data.length + " but is " + data.length + " )");
+        }
+        System.arraycopy(this.data, 0, data, 0, this.data.length);
+        return data;
+    }
+
+}
\ No newline at end of file
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/LinearKernel.java b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/LinearKernel.java
index 3e31c199e..1de8dec57 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/LinearKernel.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/math/convolution/LinearKernel.java
@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.math.convolution;
 
-import java.awt.image.Kernel;
-
 /**
  * A linear Kernel generator (all cells weight the same)
  */