TextModel - Create the bidirectional info for a given range of characters inside...

[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / text / logical-model-impl.cpp

diff --git a/dali-toolkit/internal/text/logical-model-impl.cpp b/dali-toolkit/internal/text/logical-model-impl.cpp
index 822f9f8..8af3e91 100644 (file)
--- a/dali-toolkit/internal/text/logical-model-impl.cpp
+++ b/dali-toolkit/internal/text/logical-model-impl.cpp
@@ -79,168 +79,166 @@ CharacterDirection LogicalModel::GetCharacterDirection( CharacterIndex character
 }
 
 void LogicalModel::SetVisualToLogicalMap( const BidirectionalLineInfoRun* const bidirectionalInfo,
-                                          Length numberOfRuns )
+                                          Length numberOfRuns,
+                                          CharacterIndex startIndex,
+                                          Length numberOfCharacters )
 {
-  if( 0u == numberOfRuns )
-  {
-    mVisualToLogicalMap.Clear();
-    mLogicalToVisualMap.Clear();
-    mVisualToLogicalCursorMap.Clear();
-  }
-  else
-  {
-    const Length numberOfCharacters = mText.Count();
-    mVisualToLogicalMap.Resize( numberOfCharacters );
-    mLogicalToVisualMap.Resize( numberOfCharacters );
+  mVisualToLogicalMap.Resize( numberOfCharacters );
+  mLogicalToVisualMap.Resize( numberOfCharacters );
 
-    const Length numberOfCharactersPlus = numberOfCharacters + 1u;
-    mVisualToLogicalCursorMap.Resize( numberOfCharactersPlus );
+  const Length numberOfCharactersPlus = numberOfCharacters + 1u;
+  mVisualToLogicalCursorMap.Resize( numberOfCharactersPlus );
 
-    CharacterIndex* modelVisualToLogicalMapBuffer = mVisualToLogicalMap.Begin();
-    CharacterIndex* modelLogicalToVisualMapBuffer = mLogicalToVisualMap.Begin();
+  CharacterIndex* modelVisualToLogicalMapBuffer = mVisualToLogicalMap.Begin();
+  CharacterIndex* modelLogicalToVisualMapBuffer = mLogicalToVisualMap.Begin();
 
-    CharacterIndex* modelVisualToLogicalCursorMap = mVisualToLogicalCursorMap.Begin();
+  CharacterIndex* modelVisualToLogicalCursorMap = mVisualToLogicalCursorMap.Begin();
 
-    CharacterIndex lastIndex = 0u;
-    for( unsigned int bidiIndex = 0u; bidiIndex < numberOfRuns; ++bidiIndex )
-    {
-      const BidirectionalLineInfoRun& bidiLineInfo = *( bidirectionalInfo + bidiIndex );
+  CharacterIndex lastIndex = startIndex;
+  for( unsigned int bidiIndex = 0u; bidiIndex < numberOfRuns; ++bidiIndex )
+  {
+    const BidirectionalLineInfoRun& bidiLineInfo = *( bidirectionalInfo + bidiIndex );
 
-      if( lastIndex < bidiLineInfo.characterRun.characterIndex )
-      {
-        // Fill with the identity.
-        for( ; lastIndex < bidiLineInfo.characterRun.characterIndex; ++lastIndex )
-        {
-          *( modelVisualToLogicalMapBuffer + lastIndex ) = lastIndex;
-        }
-      }
+    if( bidiLineInfo.characterRun.characterIndex + bidiLineInfo.characterRun.numberOfCharacters <= startIndex )
+    {
+      // Skip this paragraph. It has been already processed.
+      continue;
+    }
 
-      // Fill the conversion table of the run.
-      for( CharacterIndex index = 0u;
-           index < bidiLineInfo.characterRun.numberOfCharacters;
-           ++index, ++lastIndex )
+    if( lastIndex < bidiLineInfo.characterRun.characterIndex )
+    {
+      // Fill with the identity.
+      for( ; lastIndex < bidiLineInfo.characterRun.characterIndex; ++lastIndex )
       {
-        *( modelVisualToLogicalMapBuffer + lastIndex ) = bidiLineInfo.characterRun.characterIndex + *( bidiLineInfo.visualToLogicalMap + index );
+        *( modelVisualToLogicalMapBuffer + lastIndex ) = lastIndex;
       }
     }
 
-    // Complete with the identity if there are some left to right characters after the last right to left.
-    for( ; lastIndex < numberOfCharacters; ++lastIndex )
+    // Fill the conversion table of the run.
+    for( CharacterIndex index = 0u;
+         index < bidiLineInfo.characterRun.numberOfCharacters;
+         ++index, ++lastIndex )
     {
-      *( modelVisualToLogicalMapBuffer + lastIndex ) = lastIndex;
+      *( modelVisualToLogicalMapBuffer + lastIndex ) = bidiLineInfo.characterRun.characterIndex + *( bidiLineInfo.visualToLogicalMap + index );
     }
+  }
 
-    // Sets the logical to visual conversion map.
-    for( CharacterIndex index = 0u; index < numberOfCharacters; ++index )
-    {
-      *( modelLogicalToVisualMapBuffer + *( modelVisualToLogicalMapBuffer + index ) ) = index;
-    }
+  // Complete with the identity if there are some left to right characters after the last right to left.
+  for( ; lastIndex < numberOfCharacters; ++lastIndex )
+  {
+    *( modelVisualToLogicalMapBuffer + lastIndex ) = lastIndex;
+  }
+
+  // Sets the logical to visual conversion map.
+  for( CharacterIndex index = startIndex; index < numberOfCharacters; ++index )
+  {
+    *( modelLogicalToVisualMapBuffer + *( modelVisualToLogicalMapBuffer + index ) ) = index;
+  }
 
-    // Sets the visual to logical conversion map for cursor positions.
+  // Sets the visual to logical conversion map for cursor positions.
 
-    const Length numberOfBidirectionalParagraphs = mBidirectionalParagraphInfo.Count();
-    BidirectionalParagraphInfoRun* bidirectionalParagraphInfoBuffer = mBidirectionalParagraphInfo.Begin();
-    BidirectionalParagraphInfoRun* bidirectionalParagraph = bidirectionalParagraphInfoBuffer;
+  const Length numberOfBidirectionalParagraphs = mBidirectionalParagraphInfo.Count();
+  BidirectionalParagraphInfoRun* bidirectionalParagraphInfoBuffer = mBidirectionalParagraphInfo.Begin();
+  BidirectionalParagraphInfoRun* bidirectionalParagraph = bidirectionalParagraphInfoBuffer;
 
-    const CharacterDirection* const modelCharacterDirections = mCharacterDirections.Begin();
+  const CharacterDirection* const modelCharacterDirections = mCharacterDirections.Begin();
+
+  Length bidirectionalParagraphIndex = 0u;
+  bool isRightToLeftParagraph = false;
+  for( CharacterIndex index = startIndex; index < numberOfCharactersPlus; ++index )
+  {
+    if( bidirectionalParagraph &&
+        ( bidirectionalParagraph->characterRun.characterIndex == index ) )
+    {
+      isRightToLeftParagraph = *( modelCharacterDirections + index );
+    }
 
-    Length bidirectionalParagraphIndex = 0u;
-    bool isRightToLeftParagraph = false;
-    for( CharacterIndex index = 0u; index < numberOfCharactersPlus; ++index )
+    if( 0u == index )
     {
-      if( bidirectionalParagraph &&
-          ( bidirectionalParagraph->characterRun.characterIndex == index ) )
+      if( isRightToLeftParagraph )
       {
-        isRightToLeftParagraph = *( modelCharacterDirections + index );
+        *( modelVisualToLogicalCursorMap + index ) = numberOfCharacters;
       }
-
-      if( 0u == index )
+      else // else logical position is zero.
       {
-        if( isRightToLeftParagraph )
-        {
-          *( modelVisualToLogicalCursorMap + index ) = numberOfCharacters;
-        }
-        else // else logical position is zero.
-        {
-          *( modelVisualToLogicalCursorMap + index ) = 0u;
-        }
+        *( modelVisualToLogicalCursorMap + index ) = 0u;
       }
-      else if( numberOfCharacters == index )
+    }
+    else if( numberOfCharacters == index )
+    {
+      if( isRightToLeftParagraph )
       {
-        if( isRightToLeftParagraph )
+        *( modelVisualToLogicalCursorMap + index ) = 0u;
+      }
+      else // else logical position is the number of characters.
+      {
+        *( modelVisualToLogicalCursorMap + index ) = numberOfCharacters;
+      }
+    }
+    else
+    {
+      // Get the character indexed by  index - 1 and index
+      // and calculate the logical position according the directions of
+      // both characters and the direction of the paragraph.
+
+      const CharacterIndex previousIndex = index - 1u;
+      const CharacterIndex logicalPosition0 = *( modelVisualToLogicalMapBuffer + previousIndex );
+      const CharacterIndex logicalPosition1 = *( modelVisualToLogicalMapBuffer + index );
+
+      const CharacterDirection direction0 = *( modelCharacterDirections + logicalPosition0 );
+      const CharacterDirection direction1 = *( modelCharacterDirections + logicalPosition1 );
+
+      if( direction0 == direction1 )
+      {
+        // Both glyphs have the same direction.
+        if( direction0 )
         {
-          *( modelVisualToLogicalCursorMap + index ) = 0u;
+          *( modelVisualToLogicalCursorMap + index ) = logicalPosition0;
         }
-        else // else logical position is the number of characters.
+        else
         {
-          *( modelVisualToLogicalCursorMap + index ) = numberOfCharacters;
+          *( modelVisualToLogicalCursorMap + index ) = logicalPosition1;
         }
       }
       else
       {
-        // Get the character indexed by  index - 1 and index
-        // and calculate the logical position according the directions of
-        // both characters and the direction of the paragraph.
-
-        const CharacterIndex previousIndex = index - 1u;
-        const CharacterIndex logicalPosition0 = *( modelVisualToLogicalMapBuffer + previousIndex );
-        const CharacterIndex logicalPosition1 = *( modelVisualToLogicalMapBuffer + index );
-
-        const CharacterDirection direction0 = *( modelCharacterDirections + logicalPosition0 );
-        const CharacterDirection direction1 = *( modelCharacterDirections + logicalPosition1 );
-
-        if( direction0 == direction1 )
+        if( isRightToLeftParagraph )
         {
-          // Both glyphs have the same direction.
-          if( direction0 )
+          if( direction1 )
           {
-            *( modelVisualToLogicalCursorMap + index ) = logicalPosition0;
+            *( modelVisualToLogicalCursorMap + index ) = logicalPosition1 + 1u;
           }
           else
           {
-            *( modelVisualToLogicalCursorMap + index ) = logicalPosition1;
+            *( modelVisualToLogicalCursorMap + index ) = logicalPosition0;
           }
         }
         else
         {
-          if( isRightToLeftParagraph )
+          if( direction0 )
           {
-            if( direction1 )
-            {
-              *( modelVisualToLogicalCursorMap + index ) = logicalPosition1 + 1u;
-            }
-            else
-            {
-              *( modelVisualToLogicalCursorMap + index ) = logicalPosition0;
-            }
+            *( modelVisualToLogicalCursorMap + index ) = logicalPosition1;
           }
           else
           {
-            if( direction0 )
-            {
-              *( modelVisualToLogicalCursorMap + index ) = logicalPosition1;
-            }
-            else
-            {
-              *( modelVisualToLogicalCursorMap + index ) = logicalPosition0 + 1u;
-            }
+            *( modelVisualToLogicalCursorMap + index ) = logicalPosition0 + 1u;
           }
         }
       }
+    }
 
-      if( bidirectionalParagraph &&
-          ( bidirectionalParagraph->characterRun.characterIndex + bidirectionalParagraph->characterRun.numberOfCharacters == index ) )
+    if( bidirectionalParagraph &&
+        ( bidirectionalParagraph->characterRun.characterIndex + bidirectionalParagraph->characterRun.numberOfCharacters == index ) )
+    {
+      isRightToLeftParagraph = false;
+      ++bidirectionalParagraphIndex;
+      if( bidirectionalParagraphIndex < numberOfBidirectionalParagraphs )
       {
-        isRightToLeftParagraph = false;
-        ++bidirectionalParagraphIndex;
-        if( bidirectionalParagraphIndex < numberOfBidirectionalParagraphs )
-        {
-          bidirectionalParagraph = bidirectionalParagraphInfoBuffer + bidirectionalParagraphIndex;
-        }
-        else
-        {
-          bidirectionalParagraph = NULL;
-        }
+        bidirectionalParagraph = bidirectionalParagraphInfoBuffer + bidirectionalParagraphIndex;
+      }
+      else
+      {
+        bidirectionalParagraph = NULL;
       }
     }
   }