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Static build of Cairo and librsvg

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 shared librairies

You would just do :

gcc `pkg-config --cflags --libs librsvg-2.0 cairo-pdf` -o svgconvert svgconvert.c

which creates a binary of 9.0K.

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

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