Re: jpg to bmp from FrameCallbackProc without fileio

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#334

From: Peter Fagerbrant
Date: Wed, 19 Jan 2005 13:21

27 lines
2265 bytes

> Well if Scanline[] was an array that would work. But if []
> is an operator it would fail. You could just give it a try.
>
> Hans.

The function look like this:
function TBitmap.GetScanLine(Row: Integer): Pointer;
begin
  Changing(Self);
  with FImage.FDIB, dsbm, dsbmih do
  begin
    if (Row < 0) or (Row >= bmHeight) then
      InvalidOperation(@SScanLine);
    DIBNeeded;
    GDIFlush;
    if biHeight > 0 then  // bottom-up DIB
      Row := biHeight - Row - 1;
    Integer(Result) := Integer(bmBits) +
      Row * BytesPerScanline(biWidth, biBitCount, 32);
  end;
end;

As it says, it do returns a pointer, but limmited to the width of the 
pixelmap.
And it recreates the DIB for every access.

I have no clues to how make it faster.

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Subject: Re: jpg to bmp from FrameCallbackProc without fileio
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