Delphi与DirectX之DelphiX(24)：TDirectDrawSurface.Blt()、BltFast();

这两个函数可不是一般的麻烦, 特别是Blt(); 暂时搞不彻底, 这是初步尝试的例子:

代码文件:

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DXDraws, StdCtrls, DirectX;
type
TForm1 = class(TForm)
DXDraw1: TDXDraw;
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
const
ImgPath1 = 'C:\Temp\DelphiX.bmp';
ImgPath2 = 'C:\Temp\Test.bmp';
procedure TForm1.Button1Click(Sender: TObject);
var
MySurface: TDirectDrawSurface;
DF: TDDBltFX;
begin
MySurface := TDirectDrawSurface.Create(DXDraw1.DDraw);
MySurface.LoadFromFile(ImgPath1);
DXDraw1.Surface.LoadFromFile(ImgPath2);
DF.dwSize := SizeOf(DF);
DF.dwDDFX := 0;
DXDraw1.Surface.Blt(Rect(0, 0, MySurface.Width div 2, MySurface.Height div 2),
MySurface.ClientRect,
DDBLT_KEYSRC or DDBLT_WAIT,
DF,
MySurface);
DXDraw1.Flip;
FreeAndNil(MySurface);
end;
procedure TForm1.Button2Click(Sender: TObject);
var
MySurface: TDirectDrawSurface;
begin
MySurface := TDirectDrawSurface.Create(DXDraw1.DDraw);
MySurface.LoadFromFile(ImgPath1);
DXDraw1.Surface.LoadFromFile(ImgPath2);
DXDraw1.Surface.BltFast(0, 0,
Bounds(16, 4, Trunc(MySurface.Width * 0.9), Trunc(MySurface.Height * 0.9)),
DDBLTFAST_SRCCOLORKEY or DDBLTFAST_WAIT,
MySurface);
DXDraw1.Flip;
FreeAndNil(MySurface);
end;
end.