Add clone command for fonts

configure.ac

 ## ExampleLib Example: an example of using Automake to link with a library
 
-AC_INIT([freetype-gl], [1.6], [bernd@net2o.de], [freetype-gl for Linux/Android],
+AC_INIT([freetype-gl], [1.7], [bernd@net2o.de], [freetype-gl for Linux/Android],
         [https://github.com/forthy42/freetype-gl])
 AC_PREREQ([2.59])
 AM_INIT_AUTOMAKE([1.10 -Wall no-define])
@@ -18,7 +18,9 @@ case $CC in
 esac
 
 >conftest.$ac_ext
+echo -n "checking include directory for ft2build.h... "
 FTINC=`eval $ac_compiler -E -Wp,-v conftest.$ac_ext 2>&1 | grep '^ ' | while read i; do test -f $i/freetype2/ft2build.h && echo -I$i/freetype2; done`
+echo "$FTINC"
 rm conftest.$ac_ext
 
 SOURCE_PATH_SIZE=0 #$(echo $PWD | wc -c)

texture-font.c

@@ -259,12 +259,38 @@ texture_font_set_size ( texture_font_t *self, float size )
     return 1;
 }
 
+// --------------------------------------------------
+
+void
+texture_font_init_size( texture_font_t * self)
+{
+    FT_Size_Metrics metrics;
+    
+    self->underline_position = self->face->underline_position / (float)(HRESf*HRESf) * self->size;
+    self->underline_position = roundf( self->underline_position );
+    if( self->underline_position > -2 )
+    {
+        self->underline_position = -2.0;
+    }
+
+    self->underline_thickness = self->face->underline_thickness / (float)(HRESf*HRESf) * self->size;
+    self->underline_thickness = roundf( self->underline_thickness );
+    if( self->underline_thickness < 1 )
+    {
+        self->underline_thickness = 1.0;
+    }
+
+    metrics = self->face->size->metrics;
+    self->ascender = (metrics.ascender >> 6) / 100.f;
+    self->descender = (metrics.descender >> 6) / 100.f;
+    self->height = (metrics.height >> 6) / 100.f;
+    self->linegap = self->height - self->ascender + self->descender;
+}
+
 // ------------------------------------------------------ texture_font_init ---
 static int
 texture_font_init(texture_font_t *self)
 {
-    FT_Size_Metrics metrics;
-
     assert(self->atlas);
     assert(self->size > 0);
     assert((self->location == TEXTURE_FONT_FILE && self->filename)
@@ -294,25 +320,7 @@ texture_font_init(texture_font_t *self)
     if (!texture_font_load_face(self, self->size * 100.f))
         return -1;
 
-    self->underline_position = self->face->underline_position / (float)(HRESf*HRESf) * self->size;
-    self->underline_position = roundf( self->underline_position );
-    if( self->underline_position > -2 )
-    {
-        self->underline_position = -2.0;
-    }
-
-    self->underline_thickness = self->face->underline_thickness / (float)(HRESf*HRESf) * self->size;
-    self->underline_thickness = roundf( self->underline_thickness );
-    if( self->underline_thickness < 1 )
-    {
-        self->underline_thickness = 1.0;
-    }
-
-    metrics = self->face->size->metrics;
-    self->ascender = (metrics.ascender >> 6) / 100.f;
-    self->descender = (metrics.descender >> 6) / 100.f;
-    self->height = (metrics.height >> 6) / 100.f;
-    self->linegap = self->height - self->ascender + self->descender;
+    texture_font_init_size( self );
 
     if (!texture_font_set_size(self, self->size))
 	return -1;
@@ -398,6 +406,31 @@ texture_font_new_from_memory(texture_atlas_t *atlas, float pt_size,
     return self;
 }
 
+// ----------------------------------------------------- texture_font_clone ---
+texture_font_t *
+texture_font_clone( texture_font_t *old, float pt_size)
+{
+    texture_font_t *self;
+
+    self = calloc(1, sizeof(*self));
+    if (!self) {
+        freetype_gl_error( Out_Of_Memory,
+			   "line %d: No more memory for allocating data\n", __LINE__);
+        return NULL;
+    }
+
+    memcpy(self, old, sizeof(*self));
+    self->glyphs = vector_new(sizeof(texture_glyph_t *));
+    if(!texture_font_set_size ( self, pt_size * 100.f ))
+	return NULL;
+
+    texture_font_init_size( self );
+    
+    if(!texture_font_set_size ( self, pt_size ))
+	return NULL;
+
+    return self;
+}
 // ----------------------------------------------------- texture_font_close ---
 
 void

texture-font.h

@@ -459,6 +459,16 @@ typedef struct texture_font_t
                                 const void *memory_base,
                                 size_t memory_size );
 
+/**
+ * Clone the freetype-gl font and set a different size
+ *
+ * @param self         a valid texture font
+ * @param size         the new size of the font
+ */
+  texture_font_t *
+  texture_font_clone( texture_font_t *old,
+		      float pt_size);
+
 /**
  * Close the freetype structures from a font and the associated library
  *