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Cairo: A Vector Graphics Library | |
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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 */
}
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.
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. |
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