some confusion about cairo_surface_t

��



unsigned char* image_buffer_main;


image_buffer_main = (unsigned char*)malloc(100* 100 * 4); 



cairo_surface_t * cairo_surface_main;




cairo_surface_main = cairo_image_surface_create_for_data(


image_buffer_main,


CAIRO_FORMAT_ARGB32,


100,



100,


100 
* 4);


cairo_t * cairo_image_main;

cairo_image_main = cairo_create 
(cairo_surface_main);





unsigned char* image_buffer_sub;


image_buffer_sub= (unsigned char*)malloc(20* 20* 4);


cairo_surface_t * cairo_surface_sub;




cairo_surface_sub= cairo_image_surface_create_for_data(


image_buffer_sub,


CAIRO_FORMAT_ARGB32,


20,


20,


20* 4);


cairo_t * cairo_image_sub;

cairo_image_sub= cairo_create 
(cairo_surface_sub);




As above codes show, I'd like to buffer something in 
"cairo_surface_sub",


and then use "cairo_surface_sub" as the source of "cairo_image_main".


I don't know how to connect them, who can help me now?

-- 
cairo mailing list
[email protected]
http://lists.cairographics.org/mailman/listinfo/cairo