func embed(s cairo.Surface, mime mime, bs []byte) error {
raw := s.XtensionRaw()
len := C.size_t(uintptr(len(bs)))
//We make this copy as bs will be GC'd.
//We could track the object lifetime and cache the []byte in this package
//until it is destroyed, which is a fine optimization but necessitates a lot
//of code.
data := (*C.uchar)(C.malloc(len))
C.memcpy(unsafe.Pointer(data), unsafe.Pointer(&bs[0]), len)
st := C.cairo_surface_set_mime_data(raw, mime.c(), data, C.ulong(len), C.gocairo_free_get(), nil)
if st != C.CAIRO_STATUS_SUCCESS {
return errors.New("could not set mime data")
}
return nil
}
//
//static void gocairo_free(void* data) {
// free(data);
//}
//
//static cairo_destroy_func_t gocairo_free_get() {
// return &gocairo_free;
//}
import "C"
import (
"sync"
"unsafe"
)
var free = C.gocairo_free_get()
type (
id uint64
subtypeID uint64
)
func (s subtypeID) c() unsafe.Pointer {
return C.cgo_id_malloc(C.uint64_t(s))
}
var (
nextID uint64
idmux = &sync.Mutex{}
idkey = &C.cairo_user_data_key_t{}
stkey = &C.cairo_user_data_key_t{}