Re: [NTG-context] Dubious "checksum mismatch" message on log file

1 Feb 2012

      On Wed, Feb 1, 2012 at 10:21 AM, Vladimir Lomov  wrote:
...
Hello,
** luigi scarso [2012-02-01 08:45:18 +0100]:
...
On Wed, Feb 1, 2012 at 7:00 AM, Vladimir Lomov  wrote:
...
...
I specially chose that font (txr, txr.tfm and txr.vf files), it is
distributed by txfonts "package". May be you installation doesn't have
them because I installed context suite with './first-setup.sh --modules=all'.
...
...
Nevertheless, that 'Font ... at 600 ...' reminds me how pdftex (pdflatex
actually) deals with tfm/mf/pk fonts (generate pk and insert them into
pdf file).
Even with --modules=all'
LuaTeX warning (file rtxptmr): Font rtxptmr at 600 not found
and
$> pdffonts test.pdf
...
name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
Error: font resource is not a dictionary
JFRMQG+LMRoman10-Regular             CID Type 0C       yes yes yes     18  0
...
It seems that this font is not a font of the suite.
Let me stess it in other words: this ("Font ... not found") is not the
topic of thread. It is completely inrelated (IMHO) with vf font
problem (vf font leads to that "checksum" message). I took that font
because it has corresponding vf file.
ok it was just to have as much data as possible.
We have

$>vftovp txr.vf
(VTITLE )
(FAMILY TXR)
(FACE F MRR)
(CODINGSCHEME TEX TEXT)
(DESIGNSIZE R 10.0)
(COMMENT DESIGNSIZE IS IN POINTS)
(COMMENT OTHER SIZES ARE MULTIPLES OF DESIGNSIZE)
(CHECKSUM O 32212676346)

while from  luatex source

source/texk/web2c/luatexdir/font/vfovf.w:
@ process a local font in \.{VF} file
@c
static internal_font_number
vf_def_font(internal_font_number f, unsigned char *vf_buffer, int *vf_cr)
{
:
unsigned long checksum;
    cs.b0 = vf_buffer[(*vf_cr)];
    cs.b1 = vf_buffer[(*vf_cr) + 1];
    cs.b2 = vf_buffer[(*vf_cr) + 2];
    cs.b3 = vf_buffer[(*vf_cr) + 3];
    (*vf_cr) += 4;
    checksum = (unsigned)
        (cs.b0 * 256 * 256 * 256 + cs.b1 * 256 * 256 + cs.b2 * 256 + cs.b3);
:

if (checksum != 0 && font_checksum(k) != 0
            && checksum != font_checksum(k))
            vf_local_font_warning(f, k, "checksum mismatch", (int) checksum,
                                  (int) font_checksum(k));
        if (ds != font_dsize(k))
            vf_local_font_warning(f, k, "design size mismatch", ds,
                                  font_dsize(k));

It's not related to MKIV but to luatex, and it's a warning.
It doesn't even matter to have --modules==all, this vf file  in the
standard standalone.
Of course you must have the pfb/afm or otf or ttf file, as usual,
otherwise the pdf is wrong

-- 
luigi