Allow resizing atlas directly

configure.ac

 ## ExampleLib Example: an example of using Automake to link with a library
 
-AC_INIT([freetype-gl], [1.8], [bernd@net2o.de], [freetype-gl for Linux/Android],
+AC_INIT([freetype-gl], [1.9], [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])

texture-atlas.c

@@ -297,3 +297,36 @@ texture_atlas_clear( texture_atlas_t * self )
     vector_push_back( self->nodes, &node );
     memset( self->data, 0, self->width*self->height*self->depth );
 }
+
+// -------------------------------------------- texture_atlas_enlarge_atlas ---
+
+void texture_atlas_enlarge_texture ( texture_atlas_t* self, size_t width_new, size_t height_new)
+{
+    assert(self);
+    //ensure size increased
+    assert(width_new >= self->width);
+    assert(height_new >= self->height);
+    assert(width_new + height_new > self->width + self->height);
+
+    size_t width_old = self->width;
+    size_t height_old = self->height;    
+    //allocate new buffer
+    unsigned char* data_old = self->data;
+    self->data = calloc(1,width_new*height_new * sizeof(char)*self->depth);    
+    //update atlas size
+    self->width = width_new;
+    self->height = height_new;
+    //add node reflecting the gained space on the right
+    if(width_new>width_old){
+    	ivec3 node;
+        node.x = width_old - 1;
+        node.y = 1;
+        node.z = width_new - width_old;
+        vector_push_back(self->nodes, &node);    
+    }
+    //copy over data from the old buffer, skipping first row and column because of the margin
+    size_t pixel_size = sizeof(char) * self->depth;
+    size_t old_row_size = width_old * pixel_size;
+    texture_atlas_set_region(self, 1, 1, width_old - 2, height_old - 2, data_old + old_row_size + pixel_size, old_row_size);
+    free(data_old);    
+}

texture-atlas.h

@@ -194,6 +194,15 @@ typedef struct texture_atlas_t
   void
   texture_atlas_clear( texture_atlas_t * self );
 
+/**
+ *  Enlarge a texture atlas
+ *
+ *  @param self       a texture atlas structure
+ *  @param width_new  new width
+ *  @param height_new new height
+ */
+  void
+  texture_atlas_enlarge_texture ( texture_atlas_t* self, size_t width_new, size_t height_new);
 
 /** @} */
 

texture-font.c

@@ -1068,33 +1068,8 @@ texture_font_enlarge_texture( texture_font_t * self, size_t width_new,
 			      size_t height_new)
 {
     assert(self);
-    assert(self->atlas);
-    //ensure size increased
-    assert(width_new >= self->atlas->width);
-    assert(height_new >= self->atlas->height);
-    assert(width_new + height_new > self->atlas->width + self->atlas->height);    
-    texture_atlas_t* ta = self->atlas;
-    size_t width_old = ta->width;
-    size_t height_old = ta->height;    
-    //allocate new buffer
-    unsigned char* data_old = ta->data;
-    ta->data = calloc(1,width_new*height_new * sizeof(char)*ta->depth);    
-    //update atlas size
-    ta->width = width_new;
-    ta->height = height_new;
-    //add node reflecting the gained space on the right
-    if(width_new>width_old){
-    	ivec3 node;
-        node.x = width_old - 1;
-        node.y = 1;
-        node.z = width_new - width_old;
-        vector_push_back(ta->nodes, &node);    
-    }
-    //copy over data from the old buffer, skipping first row and column because of the margin
-    size_t pixel_size = sizeof(char) * ta->depth;
-    size_t old_row_size = width_old * pixel_size;
-    texture_atlas_set_region(ta, 1, 1, width_old - 2, height_old - 2, data_old + old_row_size + pixel_size, old_row_size);
-    free(data_old);    
+
+    texture_atlas_enlarge_texture ( self->atlas, width_new, height_new);
 }
 // -------------------------------------------- texture_font_enlarge_atlas ---
 void