gistfile1.hpp

void Layer::renderContent(GraphicsContext* cr)
{
    ANIM_ASSERT(isPresentation());

    cairo_surface_t* contents = modelLayer()->contents();

    if (0 && contents) {
        ANIM_ASSERT(cairo_surface_status(contents) == CAIRO_STATUS_SUCCESS);
        cairo_set_source_surface(cr, contents, 0, 0);
        cairo_rectangle(cr, 0, 0, cairo_image_surface_get_width(contents), cairo_image_surface_get_height(contents));
        cairo_fill(cr);
    } else {
        render_empty_layer_content(cr);
    }
}



HBITMAP hbitmap = /* ... */
HDC hdc = CreateCompatibleDC(0);
if (hdc) {
    HGDIOBJ oldObj = SelectObject(hdc, hbitmap);
    cairo_surface_t* surface = cairo_win32_surface_create(hdc);
    
    int width = cairo_image_surface_get_width(surface);
    /* width is 0 :( */
    
    assert(cairo_surface_status(surface) == CAIRO_STATUS_SUCCESS);
    /* true! */
        
    SelectObject(hdc, oldObj);
    DeleteDC(hdc);
}