[cairo] Recording surface as source

[Salvati Sylvain]

Dear Cairo list,

I am new to cairo and I do not quite understand the behavior of 
recording surface.  I tried to draw on a recording surface then obtain 
the rectangle of its bounding box (x,y,w,h) and then to dump the result 
onto a pdf surface of width w and height h  by translating what is on 
the recording surface with the vector (-x,-y). As it happens only the 
objects of the recording surface that have some part within the 
intersection of the rectangles (x,y,w,h) and (0,0,w,h) are drawn on the 
pdf.  Is this a normal behavior or is this some bug?  If if is the 
former how am I supposed to dump the whole content of the recording 
surface onto a pdf surface?  Here follows some small code that displays 
the problem:

#include <cairo.h>
#include <cairo-pdf.h>
#include <stdio.h>

int main (int argc, char *argv[]){
   cairo_surface_t *surface;
   cairo_t *cr;

   surface = cairo_recording_surface_create(CAIRO_CONTENT_COLOR_ALPHA,NULL);
   cr = cairo_create (surface);

   //filling red square
   cairo_set_source_rgb(cr,1,0,0);
   cairo_translate(cr,25,25);
   cairo_rectangle (cr, 0, 0, 25, 25);
   cairo_fill(cr);

   //filling blue square
   cairo_set_source_rgb(cr,0,0,1);
   cairo_translate(cr,25,25);
   cairo_rectangle (cr, 0, 0, 25, 25);
   cairo_fill(cr);
   cairo_destroy(cr);

   //Dumping onto a pdf surface
   double x,y,w,h;
cairo_recording_surface_ink_extents(surface,&x,&y,&w,&h);
   cairo_surface_t* destination = cairo_pdf_surface_create("test.pdf",w,h);
   cr = cairo_create(destination);
   cairo_set_source_surface(cr, surface, -x, -y);
   cairo_paint(cr);
   //only the red square is painted while I would expect the blue one to 
be painted too
   cairo_destroy(cr);
   cairo_surface_destroy(destination);
   cairo_surface_destroy(surface);
   return 0;
}

Sylvain.