[cairo] Newbie - simple program doesn't work

[Baptiste Gaillard]

Hello, I'm begining with cairo with a very simple program that doesn't work, but I don't understand why !!!
Here is the code:

#include <cairo-win32.h>

#define WIDTH 10000

#define HEIGHT 10000

void display_status(cairo_status_t status) {

switch(status) {

case CAIRO_STATUS_SUCCESS:

cout << "CAIRO_STATUS_SUCCESS" << endl;

break;


case CAIRO_STATUS_NULL_POINTER:

cout << "CAIRO_STATUS_NULL_POINTER" << endl;

break; 


case CAIRO_STATUS_NO_MEMORY:

cout << "CAIRO_STATUS_NO_MEMORY" << endl;

break; 


case CAIRO_STATUS_READ_ERROR:

cout << "CAIRO_STATUS_READ_ERROR" << endl;

break;


case CAIRO_STATUS_INVALID_CONTENT:

cout << "CAIRO_STATUS_INVALID_CONTENT" << endl;

break;


case CAIRO_STATUS_INVALID_FORMAT:

cout << "CAIRO_STATUS_INVALID_FORMAT" << endl;

break;


case CAIRO_STATUS_INVALID_VISUAL:

cout << "CAIRO_STATUS_INVALID_VISUAL" << endl;

break;

}

}


int main(int argc, char** argv) {

cairo_surface_t *surface;

cairo_t *cr;


surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, WIDTH, HEIGHT); 

display_status(cairo_surface_status (surface));


cr = cairo_create (surface);

display_status(cairo_surface_status (surface)); 


cairo_set_source_rgb(cr, 1,1,1);

cairo_fill(cr);

display_status(cairo_surface_status (surface));


cairo_surface_write_to_png (surface, "test.png"); 

display_status(cairo_surface_status (surface));

cairo_destroy (cr);

cairo_surface_destroy (surface);

return 0;

}



The program create a png image, but it's filled in black whereas it should be white. I tried to draw paths and other forms but it seems that the image buffer isn't 

modified. I'm working on Windows with DevC++ and use the cairo library provided with the GTK+ package for windows as indicated on the Cairo web site. 

So, do you know why this code doesn't work ?

Thanks



PS: sorry for my English, I'm french :-) 
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