rendering UTF-8 text to Postscript (including OCR-B and Barcode)

[Matthias Apitz <apitzm oclc org>]

Hello,

I'm pretty new to pango/cairo, so forgive me if this is some kind of FAQ
or otherwise a stupid question...

I hacked together a small C-pgm to understand how pango and cairo could
be used for the issue in the Subject: and I'm able to render UTF-8 text,
including OCR-B (located in ~/.fonts/OCRB.pfb) to Postscript for
printing, see attachment. It's basically a call to

    pango_layout_set_markup(layout, "normal and OCR on same line: <span font=\"" OCRB_FONT "\">ABC 0123456789</span>", -1); 

The missing next challenge is to print as well a Barcode label, like the
OCR-B number.

Could this be done on the same <span font=...> way and are there any
free barcode fonts the most used barcode types?

Thanks in advance

	matthias

-- 
Matthias Apitz
http://www.UnixArea.de/
People who hate Microsoft Windows use Linux but people who love UNIX use
FreeBSD.

#include <stdio.h>
#include <math.h>
#include <pango/pangocairo.h>
#include <cairo/cairo-ps.h>

// dimensions of the A4 page
//
#define PAGE_WIDTH  595
#define PAGE_HEIGHT 842

#define LINE_SIZE 10
#define TEXT_FONT "Monospace 6"
#define OCRB_FONT "OCRB 6"

void rendertext(cairo_t *cr, char *text);
void renderocrb(cairo_t *cr, char *text);

int main(int argc, char* argv[]) {
	cairo_t *cr;
	cairo_status_t status;	   
	cairo_surface_t *surface;  
	char buf[128];

	sprintf(buf, "<b>TEXT_FONT: [%s] LINE_SIZE: [%d], OCRB_FONT: [%s]</b>",
		TEXT_FONT, LINE_SIZE, OCRB_FONT);

	surface = cairo_ps_surface_create("my1st.ps", PAGE_WIDTH, PAGE_HEIGHT);
	status = cairo_surface_status (surface);
	if (status != CAIRO_STATUS_SUCCESS) {
		// if 'status' was not set to indicate a successful operation, error
		printf("cairo_ps_surface_create() does not give CAIRO_STATUS_SUCCESS\n");
		return 1;
	}
	cr = cairo_create(surface);
	cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);    
	cairo_paint(cr);                            

	cairo_ps_surface_dsc_begin_page_setup (surface);
	cairo_ps_surface_dsc_comment (surface, "%%PageOrientation: Portrait");

	cairo_ps_surface_dsc_comment (surface, "%%Title: My 1st Cairo-PS document");
	cairo_ps_surface_dsc_comment (surface, "%%Copyright: Copyright (C) 2011 guru unixarea de");

	cairo_ps_surface_dsc_begin_setup (surface);
	cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *MediaColor White");

	cairo_ps_surface_dsc_begin_page_setup (surface);
	cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *PageSize A4");
	cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *InputSlot LargeCapacity");
	cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *MediaType Glossy");
	cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *MediaColor Blue");

	rendertext(cr, buf);
	rendertext(cr, "");
	rendertext(cr, "<i>Arabic</i> السلام عليكم ");
	rendertext(cr, "<b>Bengali</b> (বাঙ্লা)	ষাগতোম");
	rendertext(cr, "<i><b>Greek</b></i> (Ελληνικά)  Γειά σας");
	rendertext(cr, "<u>Hebrew</u> שָׁלוֹם");
	rendertext(cr, "<b>Japanese  (日本語) こんにちは, ｺﾝﾆﾁﾊ </b>");
	rendertext(cr, "Chinese  (中文,普通话,汉语) 你好");
	rendertext(cr, "Vietnamese	(Tiếng Việt)	Xin Chào");

	rendertext(cr, "<span font=\"" OCRB_FONT "\">ABC 0123456789</span>");

	rendertext(cr, "Español ¡Que vivan los sueños!");
	rendertext(cr, "normal and OCR on same line: <span font=\"" OCRB_FONT "\">ABC 0123456789</span>");

	cairo_show_page(cr);

	cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *PageSize A4");

	cairo_destroy(cr);  
	cairo_surface_destroy(surface);

	return 0;
}

static float line = 2*LINE_SIZE;

void rendertext(cairo_t *cr, char *text) {
	PangoLayout *layout;
	PangoFontDescription *desc;

	line = line + LINE_SIZE;
	layout = pango_cairo_create_layout(cr);

	pango_layout_set_markup(layout, text, -1);

	desc = pango_font_description_from_string( TEXT_FONT );
	pango_layout_set_font_description(layout, desc);
	pango_font_description_free(desc);

	cairo_set_source_rgb(cr, 0.0, 0.0, 1.0);
	pango_cairo_update_layout(cr, layout);

	cairo_move_to(cr, 20, line);

	pango_cairo_show_layout(cr, layout);

	g_object_unref(layout);
}