From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001
From: upstream source tree <ports@midipix.org>
Date: Sun, 15 Mar 2015 20:14:05 -0400
Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified
 gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream
 tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
---
 .../gnu/java/awt/color/GrayScaleConverter.java     | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 libjava/classpath/gnu/java/awt/color/GrayScaleConverter.java

(limited to 'libjava/classpath/gnu/java/awt/color/GrayScaleConverter.java')

diff --git a/libjava/classpath/gnu/java/awt/color/GrayScaleConverter.java b/libjava/classpath/gnu/java/awt/color/GrayScaleConverter.java
new file mode 100644
index 000000000..beea9d287
--- /dev/null
+++ b/libjava/classpath/gnu/java/awt/color/GrayScaleConverter.java
@@ -0,0 +1,110 @@
+/* GrayScaleConverter.java -- Linear grayscale conversion class
+   Copyright (C) 2004 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.awt.color;
+
+
+/**
+ * Linear Grayscale converter
+ *
+ * @author Sven de Marothy
+ */
+public class GrayScaleConverter implements ColorSpaceConverter
+{
+  // intensity factors (ITU Rec. BT.709)
+  double[] coeff = { 0.2125f, 0.7154f, 0.0721f };
+
+  /**
+   * CIE 1931 D50 white point (in Lab coordinates)
+   */
+  private static float[] D50 = { 0.96422f, 1.00f, 0.82521f };
+
+  public float[] toCIEXYZ(float[] in)
+  {
+    float g = in[0];
+    if (g < 0)
+      g = 1 + g;
+    float[] out = { g * D50[0], g * D50[1], g * D50[2] }; // White spot
+    return out;
+  }
+
+  public float[] toRGB(float[] in)
+  {
+    float[] out = new float[3];
+    if (in[0] <= 0.00304f)
+      out[0] = in[0] * 12.92f;
+    else
+      out[0] = 1.055f * ((float) Math.exp((1 / 2.4) * Math.log(in[0])))
+               - 0.055f;
+    out[1] = out[2] = out[0];
+    return out;
+  }
+
+  public float[] fromCIEXYZ(float[] in)
+  {
+    float[] temp = new float[3];
+    temp[0] = 3.1338f * in[0] - 1.6171f * in[1] - 0.4907f * in[2];
+    temp[1] = -0.9785f * in[0] + 1.9160f * in[1] + 0.0334f * in[2];
+    temp[2] = 0.0720f * in[0] - 0.2290f * in[1] + 1.4056f * in[2];
+    float[] out = new float[1];
+    for (int i = 0; i < 3; i++)
+      out[0] = (float) (temp[i] * coeff[i]);
+    return out;
+  }
+
+  public float[] fromRGB(float[] in)
+  {
+    float[] out = new float[1];
+
+    // Convert non-linear RGB coordinates to linear ones,
+    //  numbers from the w3 spec.
+    out[0] = 0;
+    for (int i = 0; i < 3; i++)
+      {
+        float n = in[i];
+        if (n < 0)
+          n = 0f;
+        if (n > 1)
+          n = 1f;
+        if (n <= 0.03928f)
+          out[0] += (float) (coeff[i] * n / 12.92);
+        else
+          out[0] += (float) (coeff[i] * Math.exp(2.4 * Math.log((n + 0.055) / 1.055)));
+      }
+    return out;
+  }
+}
-- 
cgit v1.2.3