Slight refactor to put ScalingFactor into its own class (mainly because the $ in the class name was wreaking havoc on the build scripts, but also to add a few convenience methods to it) and to create a separate loader class so we can provide a .jar file with the MinGW distribution that loads the correct DLL

java/org/libjpegturbo/turbojpeg/TJScalingFactor.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C)2011 D. R. Commander.  All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - Neither the name of the libjpeg-turbo Project nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.libjpegturbo.turbojpeg;
+
+/**
+ * Fractional scaling factor
+ */
+public class TJScalingFactor {
+
+  public TJScalingFactor(int num, int denom) throws Exception {
+    if(num < 1 || denom < 1)
+      throw new Exception("Numerator and denominator must be >= 1");
+  }
+
+  /**
+   * Returns numerator
+   * @return numerator
+   */
+  public int getNum() {
+    return num;
+  }
+
+  /**
+   * Returns denominator
+   * @return denominator
+   */
+  public int getDenom() {
+    return denom;
+  }
+
+  /**
+   * Returns the scaled value of <code>dimension</code>.  This function
+   * performs the integer equivalent of
+   * <code>ceil(dimension * scalingFactor)</code>.
+   * @return the scaled value of <code>dimension</code>
+   */
+  public int getScaled(int dimension) {
+    return (dimension * num + denom - 1) / denom;
+  }
+
+  /**
+   * Returns true or false, depending on whether this instance and
+   * <code>other</code> have the same numerator and denominator.
+   * @return true or false, depending on whether this instance and
+   * <code>other</code> have the same numerator and denominator
+   */
+  public boolean equals(TJScalingFactor other) {
+    return (this.num == other.num && this.denom == other.denom);
+  }
+
+  /**
+   * Returns true or false, depending on whether this instance is equal to
+   * 1/1.
+   * @return true or false, depending on whether this instance is equal to
+   * 1/1
+   */
+  public boolean isOne() {
+    return (num == 1 && denom == 1);
+  }
+
+  /**
+   * Numerator
+   */
+  private int num = 1;
+
+  /**
+   * Denominator
+   */
+  private int denom = 1;
+};