obp/obp/pkg/termemu/fontdi.fth

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\ Hypervisor Software File: fontdi.fth
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\ ========== Copyright Header End ============================================
\ id: @(#)fontdi.fth 1.4 01/04/06
\ purpose:
\ copyright: Copyright 1990-2001 Sun Microsystems, Inc.  All Rights Reserved
\
\ Support for drop in font code
\
\ a drop in font looks like:
\   High address:
\
\      font-data    (size)       bytes of font data
\      default-font (16 bytes)   Null-terminated string
\      Reserved     (4 bytes)    reserved for future extension - must be 0
\      Checksum     (4 bytes)    32-bit sum of image bytes
\      Image size   (4 bytes)    size in bytes of image
\      Magic Number (4 bytes)    "OBMD"
\      Sync bytes   (1-3 bytes)  Enough 0x01 bytes to align the Magic Number
\                                on a 4-byte boundary.
\
\   Low address:

headerless
0 value (romfont)
: (install-font) " fonts" do-drop-in (romfont) ;
['] (install-font) is romfont

\ The idea behind this is: The first call that requires a font
\ causes the dropin to load, then after that only the address of the
\ loaded font is returned.
\
\ This save us memory when nobody is using a display device.
\
tail-chain: execute-buffer  ( adr len -- )
   over 4 " font" $= if                 ( addr len )
     dup alloc-mem dup to (romfont)     ( adr len vadr )
     ['] (romfont) is romfont           ( -- )
     swap move                          ( -- )
     exit
   then
tail;