1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
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. |
Déplacement d'un form transparent (LAYERED)
, il n'y pas de problème.
: toute la zone qui est était transparente se déplace avec la form.
Répondre avec citation
Envoyé par Pierre Castelain
Partager