Geografic-Information-System/lib/cairodriver/write.c

/*!
  \file cairodriver/write.c

  \brief GRASS cairo display driver - write image (lower level functions)

  (C) 2007-2008 by Lars Ahlzen and the GRASS Development Team
  
  This program is free software under the GNU General Public License
  (>=v2). Read the file COPYING that comes with GRASS for details.
  
  \author Lars Ahlzen <lars ahlzen.com> (original contibutor)
  \author Glynn Clements  
*/

#include "cairodriver.h"

#if defined(USE_X11) && CAIRO_HAS_XLIB_SURFACE
#include <X11/Xlib.h>
#include <cairo-xlib.h>
#endif

void cairo_write_image(void)
{
    G_debug(1, "write_image");

    if (!ca.modified)
	return;

    if (ca.mapped)
	return;

    if (!cairo || !surface)
	return;

    if (ca.file_type == FTYPE_PPM) {
	G_debug(1, "Writing image to %s", ca.file_name);
	cairo_write_ppm();
    }
    else if (ca.file_type == FTYPE_BMP) {
	G_debug(1, "Writing image to %s", ca.file_name);
	cairo_write_bmp();
    }
#if CAIRO_HAS_PNG_FUNCTIONS
    else if (ca.file_type == FTYPE_PNG) {
	G_debug(1, "Writing image to %s", ca.file_name);
	cairo_surface_write_to_png(surface, ca.file_name);
    }
#endif
#if defined(USE_X11) && CAIRO_HAS_XLIB_SURFACE
    else if (ca.file_type == FTYPE_X11) {
	G_debug(1, "Writing XID to %s", ca.file_name);
	cairo_write_xid();
    }
#endif
    /* vector format files are written directly to file */

    ca.modified = 0;
}