Flip Bitmap (Horizontal or Vertical)

Here's a sample code that flips the bitmap vertical or horizontal
and creates a new bitmap:

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{

Usage:
BitmapFlip(True,
False,
Image1.Picture.Bitmap,
Image1.Picture.Bitmap
) ;

}


interface
Uses Windows,Graphics;


Function BitmapFlip(
___Const Vertical : Boolean;
___Const Horizontal : Boolean;
var BitmapIn : TBitmap;
___ out BitmapOut : TBitmap): Boolean;


implementation


Type
___TColorData = Array[0..128000] Of TRGBTriple;
___pColorData = ^TColorData;

Function BitmapFlip( Const Vertical : Boolean;
_____________________Const Horizontal : Boolean;
var BitmapIn : TBitmap;
___out BitmapOut : TBitmap): Boolean;

Var DataIn : pColorData;
___DataOut : pColorData;
___inRow : Integer;
___inCol : Integer;

Begin
___Result := False;
___Try
___If BitmapIn.PixelFormat <> pf24bit Then Exit;
___With BitmapOut Do
___Begin
______Width := BitmapIn.Width;
______Height := BitmapIn.Height;
______PixelFormat := BitmapIn.PixelFormat;
___End;

___For inRow := 0 To BitmapIn.Height - 1 Do
___Begin
______DataIn := BitmapIn.Scanline[inRow];
______If Vertical Then
______Begin
_________DataOut := BitmapOut.ScanLine
_________[BitmapIn.Height - 1 - inRow];
______End
___Else
___Begin
______DataOut := BitmapOut.ScanLine[inRow];
___End;

___If Horizontal Then
___Begin
______For inCol := 0 To BitmapIn.Width-1 Do
_________DataOut[inCol] := DataIn[BitmapIn.Width-1-inCol];
___End
___Else
___Begin
______For inCol := 0 To BitmapIn.Width-1 Do
______DataOut[inCol] := DataIn[inCol];
___End;
___End;
______Result := True;
___Except
___End;
End;
End.


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