def _get_data_ref(self, file, filename):
self._data_hold = data = create_string_buffer(file.read())
dataref = carbon.NewHandle(sizeof(PointerDataRefRecord))
datarec = cast(dataref, POINTER(
POINTER(PointerDataRefRecord))).contents.contents
datarec.data = addressof(data)
datarec.dataLength = len(data)
self._data_handler_holder = data_handler = ComponentInstance()
r = quicktime.OpenADataHandler(dataref, PointerDataHandlerSubType,
None, 0, None, kDataHCanRead,
byref(data_handler))
_oscheck(r)
extension_handle = Handle()
self._filename_hold = filename = Str255(filename)
r = carbon.PtrToHand(filename, byref(extension_handle), len(filename))
r = quicktime.DataHSetDataRefExtension(data_handler, extension_handle,
kDataRefExtensionFileName)
_oscheck(r)
quicktime.DisposeHandle(extension_handle)
quicktime.DisposeHandle(dataref)
dataref = c_void_p()
r = quicktime.DataHGetDataRef(data_handler, byref(dataref))
_oscheck(r)
quicktime.CloseComponent(data_handler)
return dataref
def decode(self, file, filename):
data = file.read()
handle = Handle()
dataref = Handle()
carbon.PtrToHand(data, byref(handle), len(data))
carbon.PtrToHand(byref(handle), byref(dataref), sizeof(Handle))
importer = ComponentInstance()
quicktime.GetGraphicsImporterForDataRef(dataref,
HandleDataHandlerSubType,
byref(importer))
rect = Rect()
quicktime.GraphicsImportGetNaturalBounds(importer, byref(rect))
width = rect.right
height = rect.bottom
# TODO choose 24 bit where appropriate.
if sys.byteorder == 'big':
format = 'ARGB'
qtformat = k32ARGBPixelFormat
else:
format = 'BGRA'
qtformat = k32BGRAPixelFormat
buffer = (c_byte * (width * height * len(format)))()
world = GWorldPtr()
quicktime.QTNewGWorldFromPtr(byref(world), qtformat, byref(rect),
c_void_p(), c_void_p(), 0, buffer,
len(format) * width)
quicktime.GraphicsImportSetGWorld(importer, world, c_void_p())
quicktime.GraphicsImportDraw(importer)
quicktime.DisposeGWorld(world)
pitch = len(format) * width
return ImageData(width, height, format, buffer, -pitch)