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Cairo: A Vector Graphics Library | |
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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 */
}
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.
int |
not used; ignore. |
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.
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The data element being destroyed. |