TFPImageBitmap.ReadStream procedure
Read the image data from the specified Stream.
Declaration
procedure ReadStream(AStream: TMemoryStream; ASize: LongInt); overrideArguments
AStream | TMemoryStream instance with the image data read in the method. |
ASize | Not used in the current implementation. |
Description
ReadStream is an overridden method used to read the image data
from the stream specified in
AStream.
ReadStream creates an instance of the TFPCustomImageReader class
used to read the image type from a stream. It calls
InitializeReader to configure the reader class instance. If the
image reader class supports the ILazImageReader interface, it is
configure to update its description from the image data. Otherwise, the
GetDescriptionFromDevice routine is called to store the defaults
for the LCL interface image.
ReadStream calls the ImageRead method in the
TFPCustomImageReader instance to load the image data from AStream.
FinalizeReader is called when the operation is completed. The
shared image for the image type is freed, and the raw image data from the LCL
interface image is loaded into the shared image. The mask information in raw
image data is applied to the shared image. The image is flagged to update the
value for the PixelFormat property in the calling routine.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.