FOP-2945: Don't use change ipd on columns where it won't fit

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1878744 13f79535-47bb-0310-9956-ffa450edef68

fop-core/src/main/java/org/apache/fop/layoutmgr/AbstractBreaker.java

@@ -412,7 +412,7 @@ public abstract class AbstractBreaker {
                 boolean ipdChangesOnNextPage = (alg.getIPDdifference() != 0);
                 boolean onLastPageAndIPDChanges = false;
                 if (!ipdChangesOnNextPage) {
-                    onLastPageAndIPDChanges = (lastPageHasIPDChange() && !thereIsANonRestartableLM(alg)
+                    onLastPageAndIPDChanges = (lastPageHasIPDChange(optimalPageCount) && !thereIsANonRestartableLM(alg)
                             && (shouldRedoLayout() || (wasLayoutRedone() && optimalPageCount > 1)));
                 }
                 if ((ipdChangesOnNextPage || hasMoreContent() || optimalPageCount > 1)
@@ -774,7 +774,7 @@ public abstract class AbstractBreaker {
         return false;
     }
 
-    protected boolean lastPageHasIPDChange() {
+    protected boolean lastPageHasIPDChange(int optimalPageCount) {
         return false;
     }
 

fop-core/src/main/java/org/apache/fop/layoutmgr/PageBreaker.java

@@ -707,16 +707,18 @@ public class PageBreaker extends AbstractBreaker {
         return layoutRedone;
     }
 
-    protected boolean lastPageHasIPDChange() {
+    protected boolean lastPageHasIPDChange(int optimalPageCount) {
         boolean lastPageMasterDefined = pslm.getPageSequence().hasPagePositionLast();
         boolean onlyPageMasterDefined = pslm.getPageSequence().hasPagePositionOnly();
         if (lastPageMasterDefined && !onlyPageMasterDefined) {
             // code not very robust and unable to handle situations were only and last are defined
+            if (pageProvider.getCurrentColumnCount() > 1
+                    && optimalPageCount % pageProvider.getCurrentColumnCount() == 0) {
+                return false;
+            }
             int currentIPD = this.pageProvider.getCurrentIPD();
             int lastPageIPD = this.pageProvider.getLastPageIPD();
-            if (lastPageIPD != -1 && currentIPD != lastPageIPD) {
-                return true;
-            }
+            return lastPageIPD != -1 && currentIPD != lastPageIPD;
         }
         return false;
     }

fop-core/src/main/java/org/apache/fop/layoutmgr/PageProvider.java

@@ -394,8 +394,13 @@ public class PageProvider implements Constants {
     }
 
     public int getCurrentIPD() {
-        return getPageFromColumnIndex(startColumnOfCurrentElementList).getPageViewport().getBodyRegion()
-                .getColumnIPD();
+        Page page = getPageFromColumnIndex(startColumnOfCurrentElementList);
+        return page.getPageViewport().getBodyRegion().getColumnIPD();
+    }
+
+    public int getCurrentColumnCount() {
+        Page page = getPageFromColumnIndex(startColumnOfCurrentElementList);
+        return page.getPageViewport().getCurrentSpan().getColumnCount();
     }
 
     /**

fop/test/layoutengine/standard-testcases/flow_changing-ipd_last-page_16.xml

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<!-- $Id$ -->
+<testcase>
+  <info>
+    <p>
+      This test checks that the definition of a special page-master for the last page with a
+      different width that the previous "rest" page causes FOP to redo the line breaking layout.
+    </p>
+  </info>
+  <fo>
+<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:fox="http://xmlgraphics.apache.org/fop/extensions">
+  <fo:layout-master-set>
+    <fo:simple-page-master margin-top="0.25in" margin-right="0.25in" margin-left="0.25in" margin-bottom="0.25in" page-width="8.5in" master-name="RestPages" page-height="11in">
+      <fo:region-body margin-top="60pt" margin-bottom="10.8pt" column-count="2" region-name="letterPageBody"/>
+    </fo:simple-page-master>
+    <fo:simple-page-master margin-right="0.25in" margin-left="0.25in" margin-top="0.25in" margin-bottom="0.25in" page-width="8.5in" master-name="PageLast" page-height="11in">
+      <fo:region-body margin-top="39.6pt" margin-bottom="10.8pt" region-name="letterPageBody"/>
+    </fo:simple-page-master>
+    <fo:page-sequence-master master-name="LetterPages">
+      <fo:repeatable-page-master-alternatives>
+        <fo:conditional-page-master-reference page-position="rest" master-reference="PageLast" blank-or-not-blank="blank"/>
+        <fo:conditional-page-master-reference page-position="last" master-reference="PageLast"/>
+        <fo:conditional-page-master-reference page-position="any" master-reference="RestPages"/>
+      </fo:repeatable-page-master-alternatives>
+    </fo:page-sequence-master>
+  </fo:layout-master-set>
+  <fo:page-sequence format="1" id="th_default_sequence1" initial-page-number="1" force-page-count="end-on-even" master-reference="LetterPages">
+    <fo:flow flow-name="letterPageBody" font-size="40pt">
+      <fo:block>1 test test test test test test</fo:block>
+      <fo:block>2 test test test test test test</fo:block>
+      <fo:block>3 test test test test test test</fo:block>
+      <fo:block>4 test test test test test test</fo:block>
+      <fo:block>5 test test test test test test</fo:block>
+      <fo:block>6 test test test test test test</fo:block>
+      <fo:block>7 test test test test test test</fo:block>
+      <fo:block>8 test test test test test test</fo:block>
+      <fo:block>9 test test test test test test</fo:block>
+      <fo:block>10 test test test test test test</fo:block>
+      <fo:block>11 test test test test test test</fo:block>
+      <fo:block>12 test test test test test test</fo:block>
+      <fo:block>13 test test test test test test</fo:block>
+      <fo:block>14 test test test test test test</fo:block>         
+    </fo:flow>
+  </fo:page-sequence>
+</fo:root>
+</fo>
+  <checks>
+    <eval expected="1" xpath="//pageViewport[1]//lineArea[1]//text[1]/word[1]"/>
+  </checks>
+</testcase>