func makeDestinationManager(dest io.Writer, cinfo *C.struct_jpeg_compress_struct) (ret destinationManager) {
ret.magic = magic
ret.dest = dest
ret.pub.init_destination = (*[0]byte)(C.destinationInit)
ret.pub.empty_output_buffer = (*[0]byte)(C.destinationEmpty)
ret.pub.term_destination = (*[0]byte)(C.destinationTerm)
ret.pub.free_in_buffer = writeBufferSize
ret.pub.next_output_byte = (*C.JOCTET)(&ret.buffer[0])
cinfo.dest = &ret.pub
return
}
func makeDestinationManager(dest io.Writer, cinfo *C.struct_jpeg_compress_struct) (ret *destinationManager) {
ret = (*destinationManager)(C.malloc(C.size_t(unsafe.Sizeof(destinationManager{}))))
if ret == nil {
panic("Failed to allocate destinationManager")
}
ret.magic = magic
ret.dest = dest
ret.pub.init_destination = (*[0]byte)(C.destinationInit)
ret.pub.empty_output_buffer = (*[0]byte)(C.destinationEmpty)
ret.pub.term_destination = (*[0]byte)(C.destinationTerm)
ret.pub.free_in_buffer = writeBufferSize
ret.pub.next_output_byte = (*C.JOCTET)(&ret.buffer[0])
cinfo.dest = &ret.pub
return
}
func makeDestinationManager(dest io.Writer, cinfo *C.struct_jpeg_compress_struct) (mgr *destinationManager) {
mgr = new(destinationManager)
mgr.dest = dest
mgr.pub = C.malloc_jpeg_destination_mgr()
if mgr.pub == nil {
panic("Failed to allocate C.struct_jpeg_destination_mgr")
}
mgr.buffer = C.malloc(writeBufferSize)
if mgr.buffer == nil {
panic("Failed to allocate buffer")
}
mgr.pub.init_destination = (*[0]byte)(C.destinationInit)
mgr.pub.empty_output_buffer = (*[0]byte)(C.destinationEmpty)
mgr.pub.term_destination = (*[0]byte)(C.destinationTerm)
mgr.pub.free_in_buffer = writeBufferSize
mgr.pub.next_output_byte = (*C.JOCTET)(mgr.buffer)
cinfo.dest = mgr.pub
destinationManagerMapMutex.Lock()
defer destinationManagerMapMutex.Unlock()
destinationManagerMap[uintptr(unsafe.Pointer(mgr.pub))] = mgr
return
}