librsvg is currenlty part of gnome-python and therefore is not installed with pycairo on Windows. However, 'librsvg.dll' is ported to windows and may be used directly within a pycairo application. This short code snippet recreates the very basics of gnome-python's rsvg module in windows.
An extremely minimal wrapper for rsvg that can be used in Windows as a drop-in replacement:
#some code to give rsvg.render_cairo(ctx) ability
#on windows.
import os
try:
import rsvg
WINDOWS=False
except ImportError:
print"Warning, could not import 'rsvg'"
if os.name == 'nt':
print "Detected windows, creating rsvg."
#some workarounds for windows
from ctypes import *
l=CDLL('librsvg-2-2.dll')
g=CDLL('libgobject-2.0-0.dll')
g.g_type_init()
class rsvgHandle():
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)]
def __init__(self, path):
self.path = path
error = ''
self.handle = l.rsvg_handle_new_from_file(self.path,error)
def get_dimension_data(self):
svgDim = self.RsvgDimensionData()
l.rsvg_handle_get_dimensions(self.handle,byref(svgDim))
return (svgDim.width,svgDim.height)
def render_cairo(self, ctx):
ctx.save()
z = self.PycairoContext.from_address(id(ctx))
l.rsvg_handle_render_cairo(self.handle, z.ctx)
ctx.restore()
class rsvgClass():
def Handle(self,file):
return rsvgHandle(file)
rsvg = rsvgClass()
This wrapper may be used to render svg's with the same syntax as rsvg. i.e.:
h = rsvg.Handle("box.svg")
s = cairo.ImageSurface(cairo.FORMAT_ARGB32, 100, 100)
ctx = cairo.Context(s)
h.render_cairo(ctx)