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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
Menus, StdCtrls, ExtCtrls,GR32,GR32_filters,PNGImage,HSLUtils;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure FormCreate(Sender: TObject);
private
public
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
const
WS_EX_LAYERED = $80000;
AC_SRC_OVER = $0;
AC_SRC_ALPHA = $1;
LWA_COLORKEY = $1;
LWA_ALPHA = $2;
ULW_COLORKEY = $1;
ULW_ALPHA =$2;
ULW_OPAQUE = $4;
{----------------------------------------------------------------}
{ Fonction }
{----------------------------------------------------------------}
function UpdateLayeredWindow(hwnd: HWND; hdcDst: HDC; pptDst: PPoint;
psize: PSize; hdcSrc: HDC; pptSrc: PPoint; crKey: TColor;
pblend: PBlendFunction; dwFlags: DWORD): BOOL; stdcall; external 'user32.dll';
{----------------------------------------------------------------}
{ FORM1 }
{----------------------------------------------------------------}
procedure TForm1.FormCreate(Sender: TObject);
begin
doublebuffered:=true;
end;
procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
if Button=mbRight
then
begin
close;
exit;
end;
ReleaseCapture;
form1.Perform(WM_SYSCOMMAND, $F012, 0);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
FinalBitmap: TBitmap;
size: PSIZE;
TopLeft, BmpTopLeft: TPoint;
Blend: TBlendFunction;
retour: boolean;
PNG: TPNGObject;
ColorBitmap,AlphaBitmap: Tbitmap32;
screenDC: HDC;
i,j: integer;
begin
FinalBitmap := TBitmap.Create;
PNG:=TPNGObject.Create;
PNG.LoadFromFile('aquamala.png');
ColorBitmap:=TBitmap32.create;
AlphaBitmap:=TBitmap32.create;
// 1 : colorBitmap
ColorBitmap.Assign(PNG);
// 2: AlphaBitmap
AlphaBitmap.Height := PNG.Height;
AlphaBitmap.Width := PNG.Width;
For i := 0 To PNG.Height-1 Do
Begin
For j := 0 To PNG.Width-1 Do
Begin
If PNG.AlphaScanline[i][j] > 239
Then AlphaBitmap.Canvas.Pixels[j,i] := clWhite
Else AlphaBitmap.Canvas.Pixels[j,i] := HSLRangeToRGB(0,0,PNG.AlphaScanline[i][j]);
End;
End;
// 3 : fusion
IntensityToAlpha(ColorBitmap,AlphaBitmap); // graphic32 librairie
FinalBitmap.width:= PNG.Width;
FinalBitmap.Height:= PNG.Height;
FinalBitmap.PixelFormat := pf32Bit;
ColorBitmap.DrawTo(FinalBitmap.Canvas.Handle, 0, 0);
// liberation des objets non utiles
AlphaBitmap.free;
ColorBitmap.free;
PNG.Free;
// on peut passer à la fonction principale
SetWindowLong(Handle, GWL_EXSTYLE,WS_EX_LAYERED);
// ajuster la taille de la form à l'image
width:= FinalBitmap.Width;
height:=FinalBitmap.Height;
New(size);
size.cx := FinalBitmap.Width;
size.cy := FinalBitmap.Height;
TopLeft := BoundsRect.TopLeft;
BmpTopLeft := Point(0, 0);
with Blend do
begin
BlendOp := AC_SRC_OVER;
BlendFlags := 0;
SourceConstantAlpha := 255;
AlphaFormat := AC_SRC_ALPHA;
end;
screenDC := GetDC(0);
retour := UpdateLayeredWindow(Handle,screenDc,@TopLeft,size,FinalBitmap.Canvas.handle,@BmpTopLeft, 0,@blend,ULW_ALPHA);
// désactiver le bouton
Button1.OnClick:=nil;
FreeAndNil(Button1);
end;
end. |
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