[ft] font size error

[Dave Calkins]

We're using FreeTypeGL to load and display text using OpenGL (native 
Win32 C++ MFC code built with VS2005), which is in turn calling FreeType 
to load and size a font.  When we attempt to size it, an error is 
returned.  In tracing into the source, the error condition is occurring 
in a FreeType function.

When using other font family and point size choices it works fine.  For 
this particular combination of font family and point size, though, the 
sizing of the font fails with an error FNT_Err_Invalid_Pixel_Size.  
We're requesting "MS Sans Serif" with a point size of 8.  We've also 
tried a couple other sizes for this same font family with no luck.

Any ideas?  Is the problem that its a ".fon" file?

I've provided the details as to where the error is happening below in 
case you're curious.

================================

1) We're looking up the font file in the Windows registry, which yields 
"C:\Windows\Fonts\SSERIFE.FON".

2) We're loading the font via the below FreeTypeGL object instantiation 
(where fe.font is a pointer to an FTTextureFont object).

    fe.font = new FTTextureFont(fontFile);

3) After calling the above, fe.font->Error() == 0.

4) We then attempt to size the font with the below call.

    fe.font->FaceSize(pointSize);

5) This eventually calls FT_Set_Char_Size(face = <ptr>,char_width = 
0,char_height = 512,horz_resolution = 0,vert_resolution = 0).  This 
function ends up setting the char_width and char_height to both be 512 
and both resolutions to be 72.  It then calls FT_Request_Size.

6) The FT_Request_Size call ends up making the below call.

    if ( clazz->request_size )
      return clazz->request_size( face->size, req );

7) Inside the request_size call, the below case block is hit and the 
condition evals to false which leaves the error as 
FNT_Err_Invalid_Pixel_Size.

    switch ( req->type )
    {
    case FT_SIZE_REQUEST_TYPE_NOMINAL:
      if ( height == ( ( bsize->y_ppem + 32 ) >> 6 ) )
        error = FNT_Err_Ok;
      break;

It looks like its failing a check concerning which sizes are available 
in the font.  I am able, though, to use an 8pt MS Sans Serif font in, 
say, WordPad.