Как работать с fade для TImage?

type
 PRGBTripleArray = ^TRGBTripleArray;
 TRGBTripleArray = array[0..32767] of TRGBTriple;
/////////////////////////////////////////////////
// Fade In //
/////////////////////////////////////////////////
procedure FadeIn(ImageFileName: TFileName);
var
 Bitmap, BaseBitmap: TBitmap;
 Row, BaseRow: PRGBTripleArray;
 x, y, step: Integer;
begin
 // Bitmaps vorbereiten / Preparing the Bitmap //
 Bitmap := TBitmap.Create;
 try
 Bitmap.PixelFormat := pf32bit; // oder pf24bit / or pf24bit //
 Bitmap.LoadFromFile(ImageFileName);
 BaseBitmap := TBitmap.Create;
 try
 BaseBitmap.PixelFormat := pf32bit;
 BaseBitmap.Assign(Bitmap);
 // Fading //
 for step := 0 to 32 do
 begin
 for y := 0 to (Bitmap.Height - 1) do
 begin
 BaseRow := BaseBitmap.Scanline[y];
 // Farben vom Endbild holen / Getting colors from final image //
 Row := Bitmap.Scanline[y];
 // Farben vom aktuellen Bild / Colors from the image as it is now //
 for x := 0 to (Bitmap.Width - 1) do
 begin
 Row[x].rgbtRed := (step * BaseRow[x].rgbtRed) shr 5;
 Row[x].rgbtGreen := (step * BaseRow[x].rgbtGreen) shr 5; // Fading //
 Row[x].rgbtBlue := (step * BaseRow[x].rgbtBlue) shr 5;
 end;
 end;
 Form1.Canvas.Draw(0, 0, Bitmap); // neues Bild ausgeben / Output new image //
 InvalidateRect(Form1.Handle, nil, False);
 // Fenster neu zeichnen / Redraw window //
 RedrawWindow(Form1.Handle, nil, 0, RDW_UPDATENOW);
 end;
 finally
 BaseBitmap.Free;
 end;
 finally
 Bitmap.Free;
 end;
end;
/////////////////////////////////////////////////
// Fade Out //
/////////////////////////////////////////////////
procedure FadeOut(ImageFileName: TFileName);
var
 Bitmap, BaseBitmap: TBitmap;
 Row, BaseRow: PRGBTripleArray;
 x, y, step: Integer;
begin
 // Bitmaps vorbereiten / Preparing the Bitmap //
 Bitmap := TBitmap.Create;
 try
 Bitmap.PixelFormat := pf32bit; // oder pf24bit / or pf24bit //
 Bitmap.LoadFromFile(ImageFileName);
 BaseBitmap := TBitmap.Create;
 try
 BaseBitmap.PixelFormat := pf32bit;
 BaseBitmap.Assign(Bitmap);
 // Fading //
 for step := 32 downto 0 do
 begin
 for y := 0 to (Bitmap.Height - 1) do
 begin
 BaseRow := BaseBitmap.Scanline[y];
 // Farben vom Endbild holen / Getting colors from final image //
 Row := Bitmap.Scanline[y];
 // Farben vom aktuellen Bild / Colors from the image as it is now //
 for x := 0 to (Bitmap.Width - 1) do
 begin
 Row[x].rgbtRed := (step * BaseRow[x].rgbtRed) shr 5;
 Row[x].rgbtGreen := (step * BaseRow[x].rgbtGreen) shr 5; // Fading //
 Row[x].rgbtBlue := (step * BaseRow[x].rgbtBlue) shr 5;
 end;
 end;
 Form1.Canvas.Draw(0, 0, Bitmap); // neues Bild ausgeben / Output new image //
 InvalidateRect(Form1.Handle, nil, False);
 // Fenster neu zeichnen / Redraw window //
 RedrawWindow(Form1.Handle, nil, 0, RDW_UPDATENOW);
 end;
 finally
 BaseBitmap.Free;
 end;
 finally
 Bitmap.Free;
 end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
 FadeIn('C:\TestImage.bmp')
end;
{*****************************}
{ by Yucel Karapinar, ykarapinar@hotmail.com }
{ Only for 24 ve 32 bits bitmaps }
procedure FadeOut(const Bmp: TImage; Pause: Integer);
var
 BytesPorScan, counter, w, h: Integer;
 p: pByteArray;
begin
 if not (Bmp.Picture.Bitmap.PixelFormat in [pf24Bit, pf32Bit]) then
 raise Exception.Create('Error, bitmap format is not supporting.');
 try
 BytesPorScan := Abs(Integer(Bmp.Picture.Bitmap.ScanLine[1]) -
 Integer(Bmp.Picture.Bitmap.ScanLine[0]));
 except
 raise Exception.Create('Error!!');
 end;
 for counter := 1 to 256 do
 begin
 for h := 0 to Bmp.Picture.Bitmap.Height - 1 do
 begin
 P := Bmp.Picture.Bitmap.ScanLine[h];
 for w := 0 to BytesPorScan - 1 do
 if P^[w] > 0 then P^[w] := P^[w] - 1;
 end;
 Sleep(Pause);
 Bmp.Refresh;
 end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
 FadeOut(Image1, 1);
end;
Source: http://www.swissdelphicenter.ch/en/tipsindex.php
ID: 03890
Category:Графика
Category:Bitmap