glXUseXFont man page on RedHat
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GLXUSEXFONT(3G) OpenGL Manual GLXUSEXFONT(3G)
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no longer valid.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()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLXUSEXFONT(3G)
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