How to access TBitmap pixels directly in FMX2 (TBitmap.ScanLine replacement)?

Question

The FMX.Types.TBitmap class has the ScanLine property in FMX (FireMonkey), but it seems this property was removed, and is missing in FMX2 (FireMonkey FM2).

Is there any workaround ? How do we supposed to access TBitmap content directly in FMX2 ?

Answer 1

For direct access you are expect to use the Map method. The documentation includes a number of examples, such as FMX.AlphaColorToScanline:

function TForm1.TestAlphaColorToScanline(ABitmap: TBitmap;
  start, count: integer): TBitmap;
var
  bitdata1, bitdata2: TBitmapData;
begin
  Result := TBitmap.Create(Round(ABitmap.Width), Round(count));
  if (ABitmap.Map(TMapAccess.maRead, bitdata1) and
    Result.Map(TMapAccess.maWrite, bitdata2)) then
  begin
    try
      AlphaColorToScanline(@PAlphaColorArray(bitdata1.Data)
        [start * (bitdata1.Pitch div GetPixelFormatBytes(ABitmap.PixelFormat))],
        bitdata2.Data, Round(Result.Height * Result.Width),
        ABitmap.PixelFormat);
    finally
      ABitmap.Unmap(bitdata1);
      Result.Unmap(bitdata2);
    end;
  end;
end;