I just took a first serious look at the gtkprint API. I must say
it works very nicely and is quite easy to learn, at least as
regards printing text.
My first problem: I have a window displaying the content of a PNG
file, and I'd like to offer the option of printing the PNG. How
to do this?
I tried connecting the "begin_print" signal to this callback
(I've stripped out several checks for quick legibility):
static void begin_image_print (GtkPrintOperation *op,
GtkPrintContext *context,
char *pngname)
{
cairo_surface_t *cs;
cairo_t *cr;
cs = cairo_image_surface_create_from_png(pngname);
cr = cairo_create(cs);
gtk_print_context_set_cairo_context(context, cr, 72, 72);
gtk_print_operation_set_n_pages(op, 1);
}
By running a verbose version of the above I've verified that cairo
is happily creating a 640x480 surface of type CAIRO_FORMAT_ARGB32
based on the PNG file, and successfully making a cairo_t out of
it.
But then I'm not sure what, if anything, to put in a callback for
the "draw_page" signal: it sort of seems like there should be
nothing left to do. I tried just making the callback just a stub
that prints "got draw_page". But I get a blank PDF on output.
Suggestions gratefully received.
--
Allin Cottrell
Department of Economics
Wake Forest University, NC
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