vcl: migrate ImplLayoutRuns to own files

Wrote a set of unit tests for ImplLayoutRuns, and added ImplLayoutRuns
to vcl::text namespace.

Change-Id: Id6ae8882acb8e3d821bb38551e78019cbdcaa662
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/121204
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

7 files changed, 435 insertions, 191 deletions

diff --git a/solenv/clang-format/excludelist b/solenv/clang-format/excludelist
index a484535c29b1..0c69494826dd 100644
--- a/solenv/clang-format/excludelist
+++ b/solenv/clang-format/excludelist
@@ -15049,6 +15049,7 @@ vcl/source/outdev/textline.cxx
 vcl/source/outdev/transparent.cxx
 vcl/source/outdev/vclreferencebase.cxx
 vcl/source/outdev/wallpaper.cxx
+vcl/source/text/ImplLayoutRuns.cxx
 vcl/source/toolkit/group.cxx
 vcl/source/toolkit/morebtn.cxx
 vcl/source/treelist/headbar.cxx
diff --git a/vcl/Library_vcl.mk b/vcl/Library_vcl.mk
index f9403f25b7e9..99632be5c5ef 100644
--- a/vcl/Library_vcl.mk
+++ b/vcl/Library_vcl.mk
@@ -255,6 +255,7 @@ $(eval $(call gb_Library_add_exception_objects,vcl,\
     vcl/source/treelist/svimpbox \
     vcl/source/treelist/svlbitm \
     vcl/source/treelist/uiobject \
+    vcl/source/text/ImplLayoutRuns \
     vcl/source/gdi/configsettings \
     vcl/source/gdi/cvtgrf \
     vcl/source/gdi/embeddedfontshelper \
diff --git a/vcl/inc/ImplLayoutRuns.hxx b/vcl/inc/ImplLayoutRuns.hxx
new file mode 100644
index 000000000000..30ac642f3779
--- /dev/null
+++ b/vcl/inc/ImplLayoutRuns.hxx
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   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 .
+ */
+
+#pragma once
+
+#include <vcl/dllapi.h>
+
+#include <vector>
+
+// used for managing runs e.g. for BiDi, glyph and script fallback
+class VCL_DLLPUBLIC ImplLayoutRuns
+{
+private:
+    int mnRunIndex;
+    std::vector<int> maRuns;
+
+public:
+    ImplLayoutRuns()
+    {
+        mnRunIndex = 0;
+        maRuns.reserve(8);
+    }
+
+    void Clear() { maRuns.clear(); }
+    void AddPos(int nCharPos, bool bRTL);
+    void AddRun(int nMinRunPos, int nEndRunPos, bool bRTL);
+
+    bool IsEmpty() const { return maRuns.empty(); }
+    void ResetPos() { mnRunIndex = 0; }
+    void NextRun() { mnRunIndex += 2; }
+    bool GetRun(int* nMinRunPos, int* nEndRunPos, bool* bRTL) const;
+    bool GetNextPos(int* nCharPos, bool* bRTL);
+    bool PosIsInRun(int nCharPos) const;
+    bool PosIsInAnyRun(int nCharPos) const;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/sallayout.hxx b/vcl/inc/sallayout.hxx
index 594202b23239..b31aa202019c 100644
--- a/vcl/inc/sallayout.hxx
+++ b/vcl/inc/sallayout.hxx
@@ -20,25 +20,27 @@
 #ifndef INCLUDED_VCL_INC_SALLAYOUT_HXX
 #define INCLUDED_VCL_INC_SALLAYOUT_HXX
 
-#include <iostream>
-#include <memory>
-#include <vector>
-
-#include <hb.h>
-
-#include <com/sun/star/i18n/XBreakIterator.hpp>
-
 #include <basegfx/polygon/b2dpolypolygon.hxx>
-#include <i18nlangtag/languagetag.hxx>
 #include <tools/gen.hxx>
 #include <tools/degree.hxx>
+#include <i18nlangtag/languagetag.hxx>
+
 #include <vcl/dllapi.h>
-#include <vcl/vclenum.hxx> // for typedef sal_UCS4
 #include <vcl/devicecoordinate.hxx>
+#include <vcl/vclenum.hxx> // for typedef sal_UCS4
 #include <vcl/vcllayout.hxx>
 
+#include "ImplLayoutRuns.hxx"
 #include "impglyphitem.hxx"
 
+#include <com/sun/star/i18n/XBreakIterator.hpp>
+
+#include <hb.h>
+
+#include <iostream>
+#include <memory>
+#include <vector>
+
 #define MAX_FALLBACK 16
 
 
@@ -50,29 +52,6 @@ namespace vcl::text {
     class TextLayoutCache;
 }
 
-// used for managing runs e.g. for BiDi, glyph and script fallback
-class ImplLayoutRuns
-{
-private:
-    int                 mnRunIndex;
-    std::vector<int>    maRuns;
-
-public:
-            ImplLayoutRuns() { mnRunIndex = 0; maRuns.reserve(8); }
-
-    void    Clear()             { maRuns.clear(); }
-    void    AddPos( int nCharPos, bool bRTL );
-    void    AddRun( int nMinRunPos, int nEndRunPos, bool bRTL );
-
-    bool    IsEmpty() const     { return maRuns.empty(); }
-    void    ResetPos()          { mnRunIndex = 0; }
-    void    NextRun()           { mnRunIndex += 2; }
-    bool    GetRun( int* nMinRunPos, int* nEndRunPos, bool* bRTL ) const;
-    bool    GetNextPos( int* nCharPos, bool* bRTL );
-    bool    PosIsInRun( int nCharPos ) const;
-    bool    PosIsInAnyRun( int nCharPos ) const;
-};
-
 class MultiSalLayout final : public SalLayout
 {
 public:
diff --git a/vcl/qa/cppunit/text.cxx b/vcl/qa/cppunit/text.cxx
index c9f0d36c50c3..e56d1f27823e 100644
--- a/vcl/qa/cppunit/text.cxx
+++ b/vcl/qa/cppunit/text.cxx
@@ -10,7 +10,6 @@
 #include <test/bootstrapfixture.hxx>
 #include <sal/log.hxx>
 #include <tools/stream.hxx>
-#include <i18nlangtag/languagetag.hxx>
 
 #include <vcl/BitmapReadAccess.hxx>
 #include <vcl/graphicfilter.hxx>
@@ -47,6 +46,10 @@ public:
     void testSimpleText();
     void testVerticalText();
     void testTextLayoutCache();
+    void testImplLayoutRuns_AddPos();
+    void testImplLayoutRuns_AddRuns();
+    void testImplLayoutRuns_PosIsInRun();
+    void testImplLayoutRuns_PosIsInAnyRun();
     void testImplLayoutArgsBiDiStrong();
     void testImplLayoutArgsBiDiRtl();
     void testImplLayoutArgsRightAlign();
@@ -56,6 +59,10 @@ public:
     CPPUNIT_TEST(testSimpleText);
     CPPUNIT_TEST(testVerticalText);
     CPPUNIT_TEST(testTextLayoutCache);
+    CPPUNIT_TEST(testImplLayoutRuns_AddPos);
+    CPPUNIT_TEST(testImplLayoutRuns_AddRuns);
+    CPPUNIT_TEST(testImplLayoutRuns_PosIsInRun);
+    CPPUNIT_TEST(testImplLayoutRuns_PosIsInAnyRun);
     CPPUNIT_TEST(testImplLayoutArgsBiDiStrong);
     CPPUNIT_TEST(testImplLayoutArgsBiDiRtl);
     CPPUNIT_TEST(testImplLayoutArgsRightAlign);
@@ -407,6 +414,187 @@ void VclTextTest::testTextLayoutCache()
     CPPUNIT_ASSERT_EQUAL(51, run2.nEnd);
 }
 
+void VclTextTest::testImplLayoutRuns_AddPos()
+{
+    ImplLayoutRuns aRuns;
+    aRuns.AddPos(1, false);
+    aRuns.AddPos(2, false);
+    aRuns.AddPos(3, false);
+    aRuns.AddPos(4, true); // add RTL marker glyph
+    aRuns.AddPos(5, false);
+    aRuns.AddPos(6, true); // add RTL marker glyph
+    aRuns.AddPos(7, false);
+
+    int* pCharPos = new int(0);
+    bool* pRightToLeftMarker = new bool(false);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(1, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(2, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(3, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(4, *pCharPos);
+    CPPUNIT_ASSERT(*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(5, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(6, *pCharPos);
+    CPPUNIT_ASSERT(*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(7, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    // no next position, we are running off the end
+    CPPUNIT_ASSERT(!aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+
+    aRuns.ResetPos();
+
+    int nMinRunPos, nEndRunPos;
+    bool* pRightToLeft = new bool(false);
+
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(1, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(4, nEndRunPos);
+    CPPUNIT_ASSERT(!*pRightToLeft);
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(4, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(5, nEndRunPos);
+    CPPUNIT_ASSERT(*pRightToLeft);
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(5, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(6, nEndRunPos);
+    CPPUNIT_ASSERT(!*pRightToLeft);
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(6, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(7, nEndRunPos);
+    CPPUNIT_ASSERT(*pRightToLeft);
+
+    // test clear
+    aRuns.Clear();
+    CPPUNIT_ASSERT(aRuns.IsEmpty());
+}
+
+void VclTextTest::testImplLayoutRuns_AddRuns()
+{
+    ImplLayoutRuns aRuns;
+    aRuns.AddRun(1, 4, false);
+    aRuns.AddRun(5, 4, true);
+    aRuns.AddRun(5, 6, false);
+    aRuns.AddRun(6, 7, true);
+
+    int* pCharPos = new int(0);
+    bool* pRightToLeftMarker = new bool(false);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(1, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(2, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(3, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(4, *pCharPos);
+    CPPUNIT_ASSERT(*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(5, *pCharPos);
+    CPPUNIT_ASSERT(!*pRightToLeftMarker);
+
+    CPPUNIT_ASSERT(aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+    CPPUNIT_ASSERT_EQUAL(6, *pCharPos);
+    CPPUNIT_ASSERT(*pRightToLeftMarker);
+
+    // no next position, we are running off the end
+    CPPUNIT_ASSERT(!aRuns.GetNextPos(pCharPos, pRightToLeftMarker));
+
+    aRuns.ResetPos();
+
+    int nMinRunPos, nEndRunPos;
+    bool* pRightToLeft = new bool(false);
+
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(1, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(4, nEndRunPos);
+    CPPUNIT_ASSERT(!*pRightToLeft);
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(4, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(5, nEndRunPos);
+    CPPUNIT_ASSERT(*pRightToLeft);
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(5, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(6, nEndRunPos);
+    CPPUNIT_ASSERT(!*pRightToLeft);
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.GetRun(&nMinRunPos, &nEndRunPos, pRightToLeft));
+    CPPUNIT_ASSERT_EQUAL(6, nMinRunPos);
+    CPPUNIT_ASSERT_EQUAL(7, nEndRunPos);
+    CPPUNIT_ASSERT(*pRightToLeft);
+}
+
+void VclTextTest::testImplLayoutRuns_PosIsInRun()
+{
+    ImplLayoutRuns aRuns;
+    aRuns.AddRun(1, 4, false);
+    aRuns.AddRun(4, 5, true);
+    aRuns.AddRun(5, 6, false);
+    aRuns.AddRun(6, 7, true);
+
+    CPPUNIT_ASSERT(aRuns.PosIsInRun(1));
+    CPPUNIT_ASSERT(aRuns.PosIsInRun(2));
+    CPPUNIT_ASSERT(aRuns.PosIsInRun(3));
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.PosIsInRun(4));
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.PosIsInRun(5));
+
+    aRuns.NextRun();
+    CPPUNIT_ASSERT(aRuns.PosIsInRun(6));
+
+    CPPUNIT_ASSERT(!aRuns.PosIsInRun(7));
+}
+
+void VclTextTest::testImplLayoutRuns_PosIsInAnyRun()
+{
+    ImplLayoutRuns aRuns;
+    aRuns.AddRun(1, 4, false);
+    aRuns.AddRun(4, 5, true);
+    aRuns.AddRun(5, 6, false);
+    aRuns.AddRun(6, 7, true);
+
+    CPPUNIT_ASSERT(aRuns.PosIsInAnyRun(1));
+    CPPUNIT_ASSERT(!aRuns.PosIsInAnyRun(7));
+}
+
 void VclTextTest::testImplLayoutArgsBiDiStrong()
 {
     OUString sTestString = u"The quick brown fox\n jumped over the lazy dog"
diff --git a/vcl/source/gdi/sallayout.cxx b/vcl/source/gdi/sallayout.cxx
index debe3017a92a..7a69defd60f5 100644
--- a/vcl/source/gdi/sallayout.cxx
+++ b/vcl/source/gdi/sallayout.cxx
@@ -129,163 +129,6 @@ sal_UCS4 GetLocalizedChar( sal_UCS4 nChar, LanguageType eLang )
     return nChar;
 }
 
-void ImplLayoutRuns::AddPos( int nCharPos, bool bRTL )
-{
-    // check if charpos could extend current run
-    int nIndex = maRuns.size();
-    if( nIndex >= 2 )
-    {
-        int nRunPos0 = maRuns[ nIndex-2 ];
-        int nRunPos1 = maRuns[ nIndex-1 ];
-        if( ((nCharPos + int(bRTL)) == nRunPos1) && ((nRunPos0 > nRunPos1) == bRTL) )
-        {
-            // extend current run by new charpos
-            maRuns[ nIndex-1 ] = nCharPos + int(!bRTL);
-            return;
-        }
-        // ignore new charpos when it is in current run
-        if( (nRunPos0 <= nCharPos) && (nCharPos < nRunPos1) )
-            return;
-        if( (nRunPos1 <= nCharPos) && (nCharPos < nRunPos0) )
-            return;
-    }
-
-    // else append a new run consisting of the new charpos
-    maRuns.push_back( nCharPos + (bRTL ? 1 : 0) );
-    maRuns.push_back( nCharPos + (bRTL ? 0 : 1) );
-}
-
-void ImplLayoutRuns::AddRun( int nCharPos0, int nCharPos1, bool bRTL )
-{
-    if( nCharPos0 == nCharPos1 )
-        return;
-
-    // swap if needed
-    if( bRTL == (nCharPos0 < nCharPos1) )
-    {
-        int nTemp = nCharPos0;
-        nCharPos0 = nCharPos1;
-        nCharPos1 = nTemp;
-    }
-
-    if (maRuns.size() >= 2 && nCharPos0 == maRuns[maRuns.size() - 2] && nCharPos1 == maRuns[maRuns.size() - 1])
-    {
-        //this run is the same as the last
-        return;
-    }
-
-    // append new run
-    maRuns.push_back( nCharPos0 );
-    maRuns.push_back( nCharPos1 );
-}
-
-bool ImplLayoutRuns::PosIsInRun( int nCharPos ) const
-{
-    if( mnRunIndex >= static_cast<int>(maRuns.size()) )
-        return false;
-
-    int nMinCharPos = maRuns[ mnRunIndex+0 ];
-    int nEndCharPos = maRuns[ mnRunIndex+1 ];
-    if( nMinCharPos > nEndCharPos ) // reversed in RTL case
-    {
-        int nTemp = nMinCharPos;
-        nMinCharPos = nEndCharPos;
-        nEndCharPos = nTemp;
-    }
-
-    if( nCharPos < nMinCharPos )
-        return false;
-    if( nCharPos >= nEndCharPos )
-        return false;
-    return true;
-}
-
-bool ImplLayoutRuns::PosIsInAnyRun( int nCharPos ) const
-{
-    bool bRet = false;
-    int nRunIndex = mnRunIndex;
-
-    ImplLayoutRuns *pThis = const_cast<ImplLayoutRuns*>(this);
-
-    pThis->ResetPos();
-
-    for (size_t i = 0; i < maRuns.size(); i+=2)
-    {
-        bRet = PosIsInRun( nCharPos );
-        if( bRet )
-            break;
-        pThis->NextRun();
-    }
-
-    pThis->mnRunIndex = nRunIndex;
-    return bRet;
-}
-
-bool ImplLayoutRuns::GetNextPos( int* nCharPos, bool* bRightToLeft )
-{
-    // negative nCharPos => reset to first run
-    if( *nCharPos < 0 )
-        mnRunIndex = 0;
-
-    // return false when all runs completed
-    if( mnRunIndex >= static_cast<int>(maRuns.size()) )
-        return false;
-
-    int nRunPos0 = maRuns[ mnRunIndex+0 ];
-    int nRunPos1 = maRuns[ mnRunIndex+1 ];
-    *bRightToLeft = (nRunPos0 > nRunPos1);
-
-    if( *nCharPos < 0 )
-    {
-        // get first valid nCharPos in run
-        *nCharPos = nRunPos0;
-    }
-    else
-    {
-        // advance to next nCharPos for LTR case
-        if( !*bRightToLeft )
-            ++(*nCharPos);
-
-        // advance to next run if current run is completed
-        if( *nCharPos == nRunPos1 )
-        {
-            if( (mnRunIndex += 2) >= static_cast<int>(maRuns.size()) )
-                return false;
-            nRunPos0 = maRuns[ mnRunIndex+0 ];
-            nRunPos1 = maRuns[ mnRunIndex+1 ];
-            *bRightToLeft = (nRunPos0 > nRunPos1);
-            *nCharPos = nRunPos0;
-        }
-    }
-
-    // advance to next nCharPos for RTL case
-    if( *bRightToLeft )
-        --(*nCharPos);
-
-    return true;
-}
-
-bool ImplLayoutRuns::GetRun( int* nMinRunPos, int* nEndRunPos, bool* bRightToLeft ) const
-{
-    if( mnRunIndex >= static_cast<int>(maRuns.size()) )
-        return false;
-
-    int nRunPos0 = maRuns[ mnRunIndex+0 ];
-    int nRunPos1 = maRuns[ mnRunIndex+1 ];
-    *bRightToLeft = (nRunPos1 < nRunPos0) ;
-    if( !*bRightToLeft )
-    {
-        *nMinRunPos = nRunPos0;
-        *nEndRunPos = nRunPos1;
-    }
-    else
-    {
-        *nMinRunPos = nRunPos1;
-        *nEndRunPos = nRunPos0;
-    }
-    return true;
-}
-
 SalLayout::SalLayout()
 :   mnMinCharPos( -1 ),
     mnEndCharPos( -1 ),
diff --git a/vcl/source/text/ImplLayoutRuns.cxx b/vcl/source/text/ImplLayoutRuns.cxx
new file mode 100644
index 000000000000..a560e17e1b8b
--- /dev/null
+++ b/vcl/source/text/ImplLayoutRuns.cxx
@@ -0,0 +1,179 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   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 .
+ */
+
+#include <ImplLayoutRuns.hxx>
+
+void ImplLayoutRuns::AddPos( int nCharPos, bool bRTL )
+{
+    // check if charpos could extend current run
+    int nIndex = maRuns.size();
+    if( nIndex >= 2 )
+    {
+        int nRunPos0 = maRuns[ nIndex-2 ];
+        int nRunPos1 = maRuns[ nIndex-1 ];
+        if( ((nCharPos + int(bRTL)) == nRunPos1) && ((nRunPos0 > nRunPos1) == bRTL) )
+        {
+            // extend current run by new charpos
+            maRuns[ nIndex-1 ] = nCharPos + int(!bRTL);
+            return;
+        }
+        // ignore new charpos when it is in current run
+        if( (nRunPos0 <= nCharPos) && (nCharPos < nRunPos1) )
+            return;
+        if( (nRunPos1 <= nCharPos) && (nCharPos < nRunPos0) )
+            return;
+    }
+
+    // else append a new run consisting of the new charpos
+    maRuns.push_back( nCharPos + (bRTL ? 1 : 0) );
+    maRuns.push_back( nCharPos + (bRTL ? 0 : 1) );
+}
+
+void ImplLayoutRuns::AddRun( int nCharPos0, int nCharPos1, bool bRTL )
+{
+    if( nCharPos0 == nCharPos1 )
+        return;
+
+    // swap if needed
+    if( bRTL == (nCharPos0 < nCharPos1) )
+    {
+        int nTemp = nCharPos0;
+        nCharPos0 = nCharPos1;
+        nCharPos1 = nTemp;
+    }
+
+    if (maRuns.size() >= 2 && nCharPos0 == maRuns[maRuns.size() - 2] && nCharPos1 == maRuns[maRuns.size() - 1])
+    {
+        //this run is the same as the last
+        return;
+    }
+
+    // append new run
+    maRuns.push_back( nCharPos0 );
+    maRuns.push_back( nCharPos1 );
+}
+
+bool ImplLayoutRuns::PosIsInRun( int nCharPos ) const
+{
+    if( mnRunIndex >= static_cast<int>(maRuns.size()) )
+        return false;
+
+    int nMinCharPos = maRuns[ mnRunIndex+0 ];
+    int nEndCharPos = maRuns[ mnRunIndex+1 ];
+    if( nMinCharPos > nEndCharPos ) // reversed in RTL case
+    {
+        int nTemp = nMinCharPos;
+        nMinCharPos = nEndCharPos;
+        nEndCharPos = nTemp;
+    }
+
+    if( nCharPos < nMinCharPos )
+        return false;
+    if( nCharPos >= nEndCharPos )
+        return false;
+    return true;
+}
+
+bool ImplLayoutRuns::PosIsInAnyRun( int nCharPos ) const
+{
+    bool bRet = false;
+    int nRunIndex = mnRunIndex;
+
+    ImplLayoutRuns *pThis = const_cast<ImplLayoutRuns*>(this);
+
+    pThis->ResetPos();
+
+    for (size_t i = 0; i < maRuns.size(); i+=2)
+    {
+        bRet = PosIsInRun( nCharPos );
+        if( bRet )
+            break;
+        pThis->NextRun();
+    }
+
+    pThis->mnRunIndex = nRunIndex;
+    return bRet;
+}
+
+bool ImplLayoutRuns::GetNextPos( int* nCharPos, bool* bRightToLeft )
+{
+    // negative nCharPos => reset to first run
+    if( *nCharPos < 0 )
+        mnRunIndex = 0;
+
+    // return false when all runs completed
+    if( mnRunIndex >= static_cast<int>(maRuns.size()) )
+        return false;
+
+    int nRunPos0 = maRuns[ mnRunIndex+0 ];
+    int nRunPos1 = maRuns[ mnRunIndex+1 ];
+    *bRightToLeft = (nRunPos0 > nRunPos1);
+
+    if( *nCharPos < 0 )
+    {
+        // get first valid nCharPos in run
+        *nCharPos = nRunPos0;
+    }
+    else
+    {
+        // advance to next nCharPos for LTR case
+        if( !*bRightToLeft )
+            ++(*nCharPos);
+
+        // advance to next run if current run is completed
+        if( *nCharPos == nRunPos1 )
+        {
+            if( (mnRunIndex += 2) >= static_cast<int>(maRuns.size()) )
+                return false;
+            nRunPos0 = maRuns[ mnRunIndex+0 ];
+            nRunPos1 = maRuns[ mnRunIndex+1 ];
+            *bRightToLeft = (nRunPos0 > nRunPos1);
+            *nCharPos = nRunPos0;
+        }
+    }
+
+    // advance to next nCharPos for RTL case
+    if( *bRightToLeft )
+        --(*nCharPos);
+
+    return true;
+}
+
+bool ImplLayoutRuns::GetRun( int* nMinRunPos, int* nEndRunPos, bool* bRightToLeft ) const
+{
+    if( mnRunIndex >= static_cast<int>(maRuns.size()) )
+        return false;
+
+    int nRunPos0 = maRuns[ mnRunIndex+0 ];
+    int nRunPos1 = maRuns[ mnRunIndex+1 ];
+    *bRightToLeft = (nRunPos1 < nRunPos0) ;
+    if( !*bRightToLeft )
+    {
+        *nMinRunPos = nRunPos0;
+        *nEndRunPos = nRunPos1;
+    }
+    else
+    {
+        *nMinRunPos = nRunPos1;
+        *nEndRunPos = nRunPos0;
+    }
+    return true;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */