|  |  |  | Cairo: A Vector Graphics Library |  | 
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| Top | Description | ||||
typedef             cairo_bool_t;
                    cairo_user_data_key_t;
void                (*cairo_destroy_func_t)             (void *data);
                    cairo_rectangle_int_t;
typedef int cairo_bool_t;
cairo_bool_t is used for boolean values. Returns of type cairo_bool_t will always be either 0 or 1, but testing against these values explicitly is not encouraged; just use the value as a boolean condition.
 if (cairo_in_stroke (cr, x, y)) {
     /* do something */
 }
Since 1.0
typedef struct {
    int unused;
} cairo_user_data_key_t;
cairo_user_data_key_t is used for attaching user data to cairo data structures. The actual contents of the struct is never used, and there is no need to initialize the object; only the unique address of a cairo_data_key_t object is used. Typically, you would just use the address of a static cairo_data_key_t object.
Since 1.0
void                (*cairo_destroy_func_t)             (void *data);
cairo_destroy_func_t the type of function which is called when a data element is destroyed. It is passed the pointer to the data element and should free any memory and resources allocated for it.
| 
 | The data element being destroyed. | 
Since 1.0
typedef struct {
    int x, y;
    int width, height;
} cairo_rectangle_int_t;
A data structure for holding a rectangle with integer coordinates.
| X coordinate of the left side of the rectangle | |
| Y coordinate of the the top side of the rectangle | |
| width of the rectangle | |
| height of the rectangle | 
Since 1.10