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typedef struct {
  PyObject_HEAD
  cairo_t *ctx;
  PyObject *base; /* base object used to create context, or NULL */
} PycairoContext;

struct _RsvgHandle {
    GObject parent;

    RsvgHandlePrivate *priv;

    gpointer _abi_padding[15];
};
RsvgHandle *rsvg_handle_new_from_file (const gchar * file_name, GError ** error);
gboolean    rsvg_handle_render_cairo     (RsvgHandle * handle, cairo_t * cr);

Code: Alles auswählen

from ctypes import *
from ctypes import util


librsvg = cdll.LoadLibrary('/usr/local/lib/librsvg-2.2.dylib')
libgobject = cdll.LoadLibrary('/usr/local/lib/libgobject-2.0.dylib')

libgobject.g_type_init()


class RSVGDimensionData(Structure):
    
    _fields_ = [
        ('width', c_int),
        ('height', c_int),
        ('em', c_double),
        ('ex', c_double)
    ]
    
    
class PycairoContext(Structure):
    
    _fields_ = [
        ('PyObject_HEAD', c_byte * object.__basicsize__),
        ('ctx', c_void_p),
        ('base', c_void_p)
    ]
    
    
#class GObject(Structure):
#    
#	_fields_ = [
#		('g_type_instance', c_void_p),
#		('ref_count', c_uint),
#		('qdata', c_void_p),
#	]
#
#   
#class RsvgHandle(Structure):
#    
#    _fields_ = [
#        ('parent', GObject),
#        ('priv', c_void_p),
#        ('_abi_padding', c_void_p),
#    ]
    
    
class Handle(object):
    
    def __init__(self, path):
        self.path = path
        self.error = ''
        #librsvg.rsvg_handle_new_from_file.restype = RsvgHandle
        self.handle = librsvg.rsvg_handle_new_from_file(self.path, self.error)
        
    def render_cairo(self, context):
        context.save()
        c_context = PycairoContext.from_address(id(context)).ctx
        # segmentation fault...
        librsvg.rsvg_handle_render_cairo(self.handle, c_context)
        context.restore()
        
        
import cairo

handle = Handle('test.svg')
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 400, 400)
context = cairo.Context(surface)


# segmentation fault...
handle.render_cairo(context)