[Gnome-print] Can't print TIFF file from GdkPixbuf?

[Scott Gifford <sgifford tir com>]

I've got some code I'm working on printing fine from .pnm files, but
for some reason it won't work for .tiff files.  It prints them, but
they look horrible; the text contained in the images is blocky and
unreadable.

I've written a simplified test case program, which demonstrates both
the problem with TIFF files, and the non-problem with PNM files.

I've attached the program, since it's only 38 lines long.  It can be
compiled with:

    gcc `gnome-config --cflags --libs print` tiffprint.c -o tiffprint

It can be run with

    ./tiffprint filename.tiff
    ./tiffprint filename.pnm

The TIFF and PNM files are both generated with GhostScript:

  gs -dNOPAUSE -dBATCH -r300 -sDEVICE=tiffg32d -sOutputFile=/tmp/test.%d.tiff 1040rpg1.pdf
  gs -dNOPAUSE -dBATCH -r300 -sDEVICE=pnm -sOutputFile=/tmp/test.%d.tiff 1040rpg1.pnm

Both of these images can be viewed on the screen in ee, and in my own
program, which uses a GnomePixbuf to display it.

Any ideas?

Thanks,

-----ScottG.
#include <stdlib.h>
#include <gdk/gdk.h>
#include <libgnomeprint/gnome-print.h>
#include <libgnomeprint/gnome-print-dialog.h>

int main(int argc, char *argv[])
{
  GnomePrinter *printer;
  GnomePrintContext *pc;
  GdkPixbuf *pixbuf;
  float h = 11.0, w = 8.5;

  gnome_init("tiffprint","0.0",argc,argv);
  
  printer = gnome_printer_dialog_new_modal();
  if (!printer)
    return;
  pc = gnome_print_context_new_with_paper_size(printer,"US-Letter");

  gnome_print_beginpage(pc, "Form");

  if (!(pixbuf = gdk_pixbuf_new_from_file(argv[1])))
  {
    printf("Couldn't load pixmap '%s'!\n",argv[1]);
    exit(1);
  }

  gnome_print_moveto(pc,0,h*72.0);
  gnome_print_gsave(pc);
  gnome_print_scale(pc, w*72.0, h*72.0);
  gnome_print_rotate(pc, 0.0);
  gnome_print_pixbuf(pc, pixbuf);
  gnome_print_grestore(pc);

  gnome_print_showpage(pc);
  gnome_print_context_close(pc);
}