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glxusexfont (3)
  • >> glxusexfont (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         glXUseXFont - create bitmap display lists from an X font
    
    
    C SPECIFICATION
         void glXUseXFont( Font font,
                           int first,
                           int count,
                           int listBase )
    
    
    PARAMETERS
         font      Specifies the font from which character glyphs are
                   to be taken.
    
         first     Specifies the index  of  the  first  glyph  to  be
                   taken.
    
         count     Specifies the number of glyphs to be taken.
    
         listBase  Specifies the index of the first display  list  to
                   be generated.
    
    DESCRIPTION
         glXUseXFont generates count display  lists,  named  listBase
         through  listBase+count-1, each containing a single glBitmap
         command.  The parameters of the glBitmap command of  display
         list  listBase+i  are  derived  from  glyph first+i.  Bitmap
         parameters xorig, yorig, width, and height are computed from
         font metrics as descent-1, -lbearing, rbearing-lbearing, and
         ascent+descent,  respectively.   xmove  is  taken  from  the
         glyph's  width  metric,  and ymove is set to zero.  Finally,
         the glyph's image is converted to the appropriate format for
         glBitmap.
    
         Using glXUseXFont may be more efficient than accessing the X
         font  and  generating  the  display  lists  explicitly, both
         because the display lists are created on the server  without
         requiring  a  round  trip of the glyph data, and because the
         server may choose to delay the creation of each bitmap until
         it is accessed.
    
         Empty display lists are created  for  all  glyphs  that  are
         requested  and  are  not  defined  in  font.  glXUseXFont is
         ignored if there is no current GLX context.
    
    ERRORS
         BadFont is generated if font is not a valid font.
    
         GLXBadContextState is generated if the current  GLX  context
         is in display-list construction mode.
    
         GLXBadCurrentWindow is generated if the drawable  associated
         with  the current context of the calling thread is a window,
         and that window is no longer valid.
    
    SEE ALSO
         glBitmap, glXMakeCurrent
    
    
    
    


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