tdf#115353 tdf#114743 Use first valid glyph

in AdjustLayout.

Change-Id: Iaa9a0cde2bd35fed5cbc9ebf0690341812679b6f
Reviewed-on: https://gerrit.libreoffice.org/49542
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

1 files changed, 23 insertions, 11 deletions

diff --git a/vcl/source/gdi/sallayout.cxx b/vcl/source/gdi/sallayout.cxx
index b8957ae14eb3..403d0b64c723 100644
--- a/vcl/source/gdi/sallayout.cxx
+++ b/vcl/source/gdi/sallayout.cxx
@@ -1206,15 +1206,27 @@ void MultiSalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
     double fUnitMul = 1.0;
     for( n = 0; n < nLevel; ++n )
         maFallbackRuns[n].ResetPos();
+
+    int nFirstValid = -1;
+    for( n = 0; n < nLevel; ++n )
+    {
+        if(nValid[n] > 0)
+        {
+            nFirstValid = n;
+            break;
+        }
+    }
+    assert(nFirstValid >= 0);
+
     // get the next codepoint index that needs fallback
-    int nActiveCharPos = pGlyphs[0]->mnCharPos;
+    int nActiveCharPos = pGlyphs[nFirstValid]->mnCharPos;
     int nActiveCharIndex = nActiveCharPos - mnMinCharPos;
     // get the end index of the active run
     int nLastRunEndChar = (nActiveCharIndex >= 0 && vRtl[nActiveCharIndex]) ?
         rArgs.mnEndCharPos : rArgs.mnMinCharPos - 1;
-    int nRunVisibleEndChar = pGlyphs[0]->mnCharPos;
+    int nRunVisibleEndChar = pGlyphs[nFirstValid]->mnCharPos;
     // merge the fallback levels
-    while( nValid[0] && (nLevel > 0))
+    while( nValid[nFirstValid] && (nLevel > 0))
     {
         // find best fallback level
         for( n = 0; n < nLevel; ++n )
@@ -1241,15 +1253,15 @@ void MultiSalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
         {
             // drop the NotDef glyphs in the base layout run if a fallback run exists
             while (
-                    (maFallbackRuns[n-1].PosIsInRun(pGlyphs[0]->mnCharPos)) &&
-                    (!maFallbackRuns[n].PosIsInAnyRun(pGlyphs[0]->mnCharPos))
+                    (maFallbackRuns[n-1].PosIsInRun(pGlyphs[nFirstValid]->mnCharPos)) &&
+                    (!maFallbackRuns[n].PosIsInAnyRun(pGlyphs[nFirstValid]->mnCharPos))
                   )
             {
                 mpLayouts[0]->DropGlyph( nStartOld[0] );
                 nStartOld[0] = nStartNew[0];
-                nValid[0] = mpLayouts[0]->GetNextGlyphs(1, &pGlyphs[0], aPos, nStartNew[0]);
+                nValid[nFirstValid] = mpLayouts[0]->GetNextGlyphs(1, &pGlyphs[nFirstValid], aPos, nStartNew[0]);
 
-                if( !nValid[0] )
+                if( !nValid[nFirstValid] )
                    break;
             }
         }
@@ -1301,9 +1313,9 @@ void MultiSalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
             else
             {
                 // break when a fallback is needed and available
-                bool bNeedFallback = maFallbackRuns[0].PosIsInRun(pGlyphs[0]->mnCharPos);
+                bool bNeedFallback = maFallbackRuns[0].PosIsInRun(pGlyphs[nFirstValid]->mnCharPos);
                 if( bNeedFallback )
-                    if (!maFallbackRuns[nLevel-1].PosIsInRun(pGlyphs[0]->mnCharPos))
+                    if (!maFallbackRuns[nLevel-1].PosIsInRun(pGlyphs[nFirstValid]->mnCharPos))
                         break;
                 // break when change from resolved to unresolved base layout run
                 if( bKeepNotDef && !bNeedFallback )
@@ -1356,7 +1368,7 @@ void MultiSalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
                   nRunAdvance -= aMultiArgs.mpDXArray[nLastRunEndChar - mnMinCharPos];
             }
             nLastRunEndChar = nRunVisibleEndChar;
-            nRunVisibleEndChar = pGlyphs[0]->mnCharPos;
+            nRunVisibleEndChar = pGlyphs[nFirstValid]->mnCharPos;
             // the requested width is still in pixel units
             // => convert it to base level font units
             nRunAdvance *= mnUnitsPerPixel;
@@ -1373,7 +1385,7 @@ void MultiSalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
         nXPos += nRunAdvance;
 
         // prepare for next fallback run
-        nActiveCharPos = pGlyphs[0]->mnCharPos;
+        nActiveCharPos = pGlyphs[nFirstValid]->mnCharPos;
         // it essential that the runs don't get ahead of themselves and in the
         // if( bKeepNotDef && !bNeedFallback ) statement above, the next run may
         // have already been reached on the base level