[cairo-commit] [cairo-www] src/cairo_rsvg_and_python_in_windows.mdwn

[Carl Worth]

 src/cairo_rsvg_and_python_in_windows.mdwn |   63 ++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

New commits:
commit 08ccb2fe0be9ad0f4f54955873605883c2cecbba
Author: Carl Worth <cworth at freedesktop.org>
Date:   Mon Dec 8 16:21:48 2008 -0800

    web commit by siefkenj

diff --git a/src/cairo_rsvg_and_python_in_windows.mdwn b/src/cairo_rsvg_and_python_in_windows.mdwn
new file mode 100644
index 0000000..6edcd1c
--- /dev/null
+++ b/src/cairo_rsvg_and_python_in_windows.mdwn
@@ -0,0 +1,63 @@
+An extremely minimal wrapper for rsvg that can be used in windows as a drop-in replacement for rsvg might go as follows:
+
+    #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 = cario.ImageSurface(cairo.FORMAT_ARGB32, 100, 100) 
+    ctx = cairo.Context(s)
+    h.render_cairo(ctx)