Why ?
- Convert SVG files to PDF or PNG, with full Unicode support (right-to-left languages), transparency, gradients, PDF image compression, ...
- Cairo and librsvg are the best in town.
- Cairo and librsvg are very modern libraries which became famous only in the past 3 years. Thus, GNU/Linux distributions do not always have recent versions and full capabilities.
- A static build does all the bindings to libraries at compile time, which hence removes specific versions dependencies. (this method has many drawbacks but can help sometimes)
The program : svgconvert.c
/*
* Copyright © 2005 Red Hat, Inc.
* Copyright © 2006 Red Hat, Inc.
* Copyright © 2007 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors: Kristian Høgsberg <krh@redhat.com>
* Carl Worth <cworth@redhat.com>
* Behdad Esfahbod <besfahbo@redhat.com>
* Mathieu Leplatre <contact@mathieu-leplatre.info>
*/
#include <stdio.h>
#include <stdlib.h>
#include <glib/gprintf.h>
#include <librsvg/rsvg.h>
#include <librsvg/rsvg-cairo.h>
#include <cairo-pdf.h>
#define FAIL(msg) \
do { fprintf (stderr, "FAIL: %s\n", msg); exit (-1); } while (0)
#define PIXELS_PER_POINT 1
#define PDF 0
#define PNG 1
int main (int argc, char *argv[])
{
GError *error = NULL;
RsvgHandle *handle;
RsvgDimensionData dim;
double width, height;
const char *filename = argv[1];
const char *output_filename = argv[2];
cairo_surface_t *surface;
cairo_t *cr;
cairo_status_t status;
int mode;
if (argc != 3)
FAIL ("usage: svgconvert input_file.svg output_file");
mode = PDF;
if (g_str_has_suffix (g_ascii_strdown (output_filename, -1), ".png")) {
mode = PNG;
}
g_type_init ();
rsvg_set_default_dpi (72.0);
handle = rsvg_handle_new_from_file (filename, &error);
if (error != NULL)
FAIL (error->message);
rsvg_handle_get_dimensions (handle, &dim);
width = dim.width;
height = dim.height;
if (mode == PNG) {
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
}
else {
surface = cairo_pdf_surface_create (output_filename, width, height);
}
cr = cairo_create (surface);
rsvg_handle_render_cairo (handle, cr);
status = cairo_status (cr);
if (status)
FAIL (cairo_status_to_string (status));
if (mode == PNG) {
cairo_surface_write_to_png (surface, output_filename);
}
cairo_destroy (cr);
cairo_surface_destroy (surface);
return 0;
}
Build with static librairies
- First install the development versions of the packages, to make sure you have all /usr/lib/*.a mentioned below.
- Use this Makefile, which creates a binary of 5.9M. It was tested on Ubuntu 8.04 which comes with Gnome 2.22, librsvg 2.22 and Cairo 1.6.0.
ALL=svgconvert
MYCFLAGS=`pkg-config --cflags librsvg-2.0 cairo-pdf`
LDFLAGS=`pkg-config --libs librsvg-2.0 cairo-pdf freetype2 fontconfig pango pangoft2 pangocairo cairo-ft libthai datrie libgsf-1 gnome-vfs-2.0 libcroco-0.6 libpcre pixman-1 libpng libxml-2.0`
MYLDFLAGS=$(LDFLAGS) /usr/lib/libgio-2.0.a /usr/lib/libglib-2.0.a /usr/lib/libselinux.a /usr/lib/libexpat.a /usr/lib/libfreetype.a /usr/lib/libbz2.a /usr/lib/libjpeg.a /usr/lib/libtiff.a /usr/lib/libbz2.a /usr/lib/libz.a /usr/lib/libm.a
all: $(ALL)
%: %.c
$(CC) $^ -pthread $(MYCFLAGS) -static $(MYLDFLAGS) -o $@
clean:
rm -f $(ALL) *.o
- To check if pkg-config knows about a specific library :
$ pkg-config --list-all | grep vfs
gnome-vfs-sharp-2.0 GnomeVfs - GnomeVfs
gnome-vfs-2.0 gnome-vfs - The GNOME virtual file-system libraries
gnome-vfsmm-2.6 gnome-vfsmm - C++ wrapper for gnome-vfs
gnome-vfs-module-2.0 gnome-vfs-module - The GNOME virtual file-system module include info
- To check if a library has a specific symbol, use the nm command :
$ nm /usr/lib/libexpat.a | grep XML_SetStart
000001c0 T XML_SetStartCdataSectionHandler
00000240 T XML_SetStartDoctypeDeclHandler
00000150 T XML_SetStartElementHandler
000002a0 T XML_SetStartNamespaceDeclHandler
References
- http://cairographics.org
- http://librsvg.sourceforge.net
- Thanks for the precious help of Carl Worth on #cairo at irc.freenode.net, Zugzwang and nvteighen on http://ubuntuforums.org
#cairo, #svg, #C - Posted in the Dev category