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[gimp-help] Create long-shadow filter

commit ba92d60491691811a71ba28801953a9f073352bb
Author: Julien Hardelin <jhardlin orange fr>
Date:   Sat Jan 5 18:18:42 2019 +0100

    Create long-shadow filter

 .../light-and-shadow/long-shadow-ex-angle.png      | Bin 0 -> 5983 bytes
 .../light-and-shadow/long-shadow-ex-default.png    | Bin 0 -> 4331 bytes
 .../light-and-shadow/long-shadow-ex-fading.png     | Bin 0 -> 10279 bytes
 .../light-and-shadow/long-shadow-ex-fixlength.png  | Bin 0 -> 8234 bytes
 .../light-and-shadow/long-shadow-ex-infinite.png   | Bin 0 -> 3549 bytes
 .../light-and-shadow/long-shadow-ex-length.png     | Bin 0 -> 5263 bytes
 .../light-and-shadow/long-shadow-ex-orig.png       | Bin 0 -> 7789 bytes
 .../light-and-shadow/long-shadow-ex-shadminus.png  | Bin 0 -> 2160 bytes
 .../light-and-shadow/long-shadow-ex-shadonly.png   | Bin 0 -> 3977 bytes
 .../light-and-shadow/long-shadow-dialog.png        | Bin 0 -> 22798 bytes
 src/filters/light-and-shadow.xml                   |   2 +-
 src/filters/light-and-shadow/long-shadow.xml       | 189 +++++++++++++++++++++
 12 files changed, 190 insertions(+), 1 deletion(-)
---
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-angle.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-angle.png
new file mode 100644
index 000000000..857322759
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-angle.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-default.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-default.png
new file mode 100644
index 000000000..deddfd38a
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-default.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-fading.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-fading.png
new file mode 100644
index 000000000..368e075c5
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-fading.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-fixlength.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-fixlength.png
new file mode 100644
index 000000000..6be3219a3
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-fixlength.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-infinite.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-infinite.png
new file mode 100644
index 000000000..b36e2ab60
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-infinite.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-length.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-length.png
new file mode 100644
index 000000000..3f204cf25
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-length.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-orig.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-orig.png
new file mode 100644
index 000000000..eb306e834
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-orig.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-shadminus.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-shadminus.png
new file mode 100644
index 000000000..9e325b091
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-shadminus.png differ
diff --git a/images/C/filters/examples/light-and-shadow/long-shadow-ex-shadonly.png 
b/images/C/filters/examples/light-and-shadow/long-shadow-ex-shadonly.png
new file mode 100644
index 000000000..157cd4631
Binary files /dev/null and b/images/C/filters/examples/light-and-shadow/long-shadow-ex-shadonly.png differ
diff --git a/images/C/filters/light-and-shadow/long-shadow-dialog.png 
b/images/C/filters/light-and-shadow/long-shadow-dialog.png
new file mode 100644
index 000000000..69ed9dfa2
Binary files /dev/null and b/images/C/filters/light-and-shadow/long-shadow-dialog.png differ
diff --git a/src/filters/light-and-shadow.xml b/src/filters/light-and-shadow.xml
index 0f70df1b2..938eef8e5 100644
--- a/src/filters/light-and-shadow.xml
+++ b/src/filters/light-and-shadow.xml
@@ -25,7 +25,7 @@
   
   <!-- Shadows -->
   <xi:include href="light-and-shadow/drop-shadow.xml"/>
-  <!--<xi:include href="light-and-shadow/long-shadow.xml"/>-->
+  <xi:include href="light-and-shadow/long-shadow.xml"/>
   <!--<xi:include href="light-and-shadow/vignette.xml"/>-->
   <xi:include href="light-and-shadow/drop-shadow-legacy.xml"/>
   <xi:include href="light-and-shadow/perspective-shadow.xml"/>
diff --git a/src/filters/light-and-shadow/long-shadow.xml b/src/filters/light-and-shadow/long-shadow.xml
new file mode 100644
index 000000000..25c795f89
--- /dev/null
+++ b/src/filters/light-and-shadow/long-shadow.xml
@@ -0,0 +1,189 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+                       "http://www.docbook.org/xml/4.3/docbookx.dtd";>
+<!-- section history:
+  2019-01-01 j.h: create
+-->
+<sect2 xmlns:xi="http://www.w3.org/2001/XInclude"; id="gimp-filter-long-shadow">
+  <title>Long Shadow</title>
+
+  <indexterm>
+    <primary>Filters</primary>
+    <secondary>Long Shadow</secondary>
+  </indexterm>
+  <indexterm>
+    <primary>Long Shadow</primary>
+  </indexterm>
+  
+  <sect3>
+    <title>Overview</title>
+    <para>
+      This GEGL-based filter appeared with GIMP-2.10.6. It simplifies creating 
+      long shadows in several visual styles.
+    </para>
+  </sect3>
+
+  <sect3>
+    <title>Activate the filter</title>
+    <para>
+      You can find this filter in the image menu menu through
+      <menuchoice>
+        <guimenu>Filters</guimenu>
+        <guisubmenu>Light and Shadow</guisubmenu>
+        <guimenuitem>Long Shadow…</guimenuitem>
+      </menuchoice>.
+    </para>
+    <para>
+      This filter is normally disabled. You must add an Alpha channel to your 
+      image to use it.
+    </para>
+  </sect3>
+  
+  <sect3>
+    <title>Options</title>
+    <figure>
+      <title><quote>Long Shadow</quote> filter options</title>
+      <mediaobject>
+        <imageobject>
+    <imagedata 
+fileref="images/filters/light-and-shadow/long-shadow-dialog.png" 
+format="PNG"/>
+        </imageobject>
+      </mediaobject>
+    </figure>
+    <variablelist>
+      <varlistentry>
+        <term>Presets, Preview, Split view</term>
+        <listitem>
+          <xi:include href="../about-common-features.xml"/>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>Style</term>
+        <listitem>
+          <mediaobject>
+            <imageobject>
+              <imagedata format="PNG"
+  fileref="images/filters/examples/light-and-shadow/long-shadow-ex-orig.png"/>
+            </imageobject>
+            <caption>
+              Original: the text layer is Menus/layer/Layer to Image Size
+            </caption>
+          </mediaobject>
+          <para>
+            You can use different styles <guilabel>Finite</guilabel> that is 
+            default, <guilabel>Infinite</guilabel>, <guilabel>Fading</guilabel>, 
+            and <guilabel>Fading (fixed length)</guilabel>.
+          </para>
+          <figure>
+            <title><quote>Style</quote> option examples</title>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="PNG"
+  fileref="images/filters/examples/light-and-shadow/long-shadow-ex-default.png"/>
+              </imageobject>
+              <caption>
+                Finite (default)
+              </caption>
+            </mediaobject>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="PNG"
+fileref="images/filters/examples/light-and-shadow/long-shadow-ex-infinite.png"/>
+              </imageobject>
+              <caption>
+                Infinite
+              </caption>
+            </mediaobject>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="PNG"
+  
+fileref="images/filters/examples/light-and-shadow/long-shadow-ex-fading.png"/>
+              </imageobject>
+              <caption>
+                Fading
+              </caption>
+            </mediaobject>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="PNG"
+fileref="images/filters/examples/light-and-shadow/long-shadow-ex-fixlength.png"/>
+              </imageobject>
+              <caption>
+                Fading (fixed length); length = 30
+              </caption>
+            </mediaobject>
+          </figure>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>Angle</term>
+        <listitem>
+          <para>
+            Shadow angle, in degrees.
+          </para>
+          <mediaobject>
+            <imageobject>
+              <imagedata format="PNG"
+fileref="images/filters/examples/light-and-shadow/long-shadow-ex-angle.png"/>
+            </imageobject>
+            <caption>
+              Angle = 110°
+            </caption>
+          </mediaobject>
+          </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>Length</term>
+        <listitem>
+          <para>
+            Shadow length, in pixels
+           </para>
+          <mediaobject>
+            <imageobject>
+              <imagedata format="PNG"
+fileref="images/filters/examples/light-and-shadow/long-shadow-ex-length.png"/>
+            </imageobject>
+            <caption>
+              Length = 30
+            </caption>
+          </mediaobject>
+         </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>Composition</term>
+        <listitem>
+          <para>
+            <guilabel>Shadow plus image</guilabel> is default.
+          </para>
+          <figure>
+            <title><quote>Composition</quote> option examples</title>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="PNG"
+fileref="images/filters/examples/light-and-shadow/long-shadow-ex-shadonly.png"/>
+              </imageobject>
+              <caption>
+                <para>
+                  Shadow only
+                </para>
+              </caption>
+            </mediaobject>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="PNG"
+fileref="images/filters/examples/light-and-shadow/long-shadow-ex-shadminus.png"/>
+              </imageobject>
+              <caption>
+                <para>
+                  Shadow minus image
+                </para>
+              </caption>
+            </mediaobject>
+          </figure>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </sect3>
+</sect2>
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