Fixed a bug on the handling of empty EncodedText.

src/osgText/FTFont.cpp

@@ -141,17 +141,18 @@ float FTFont::Advance( const char* string)
     return width;
 }
 
-float FTFont::Advance( std::vector<int>::const_iterator string)
+float FTFont::Advance( std::vector<int>::const_iterator first,
+                       std::vector<int>::const_iterator last)
 {
     // all are the same, a bit a hack
     FTGlyphContainer* glyphList=_contextGlyphList[0];
-    std::vector<int>::const_iterator c = string; 
     float width = 0;
 
-    while( *c)
+    for (std::vector<int>::const_iterator c = first;
+         c!=last;
+         ++c)
     {
         width += glyphList->Advance( *c, *(c + 1));    
-        c++;
     }
 
     return width;
@@ -198,21 +199,22 @@ void FTFont::render( const wchar_t* string , unsigned int renderContext)
     }
 }
 
-void FTFont::render( std::vector<int>::const_iterator string , unsigned int renderContext)
+void FTFont::render( std::vector<int>::const_iterator first,
+                     std::vector<int>::const_iterator last,
+                     unsigned int renderContext)
 {
     FTGlyphContainer* glyphList=_contextGlyphList[renderContext];
  
-    std::vector<int>::const_iterator c = string;
     FT_Vector kernAdvance;
     pen.x = 0; pen.y = 0;
 
-    while( *c)
+    for (std::vector<int>::const_iterator c = first;
+         c!=last;
+         ++c)
     {
         kernAdvance = glyphList->render( *c, *(c + 1), pen);
         pen.x += kernAdvance.x;
         pen.y += kernAdvance.y;
-
-        c++;
     }
 }
 

src/osgText/FTFont.h

@@ -119,7 +119,8 @@ class FTGL_EXPORT FTFont
          * @param string    a pointer to an array of decoded unicode characters
          * @return        advance width
          */
-        float Advance( std::vector<int>::const_iterator string);
+        float Advance( std::vector<int>::const_iterator first,
+                       std::vector<int>::const_iterator last);
 
         /**
          * Renders a string of characters
@@ -135,7 +136,9 @@ class FTGL_EXPORT FTFont
          * @param string    unicode string to be output.     
          */
         // mrn@changes
-        virtual void render( std::vector<int>::const_iterator string , unsigned int renderContext=0);
+        virtual void render( std::vector<int>::const_iterator first,
+                             std::vector<int>::const_iterator last,
+                             unsigned int renderContext=0);
 
         /**
          * Renders a string of characters

src/osgText/Font.cpp

@@ -178,7 +178,7 @@ bool  Font::create(osg::State& state)
 void Font::output(osg::State& state, const EncodedText* text) const
 {
     if(_created)
-        _font->render(text->getUnicodeText(),state.getContextID());
+        _font->render(text->begin(),text->end(),state.getContextID());
     else
     {
         // ahhhh, this is bit doddy, the draw is potentially
@@ -204,8 +204,8 @@ void  Font::clear()
 float Font::
 getWidth(const EncodedText* text)  const
 {
-    if(_init && _created)
-        return _font->Advance(text->getUnicodeText());
+    if(_init && _created && text)
+        return _font->Advance(text->begin(),text->end());
     else
         return -1;
 }