glXUseXFont -- create bitmap display lists from an X font
void glXUseXFont(Font font,
Specifies the font from which character glyphs are to be taken.
Specifies the index of the first glyph to be taken.
Specifies the number of glyphs to be taken.
Specifies the index of the first display list to be generated.
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.
BadFont is generated if font is not a valid font.
GLX_BAD_CONTEXT_STATE is generated if the current GLX context is in
display-list construction mode.
GLX_BAD_CURRENT_WINDOW is generated if the drawable associated with the
current context of the calling thread is a window, and that window is no
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© 1995 Uwe Behrens All rights reserved