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

這兩個函數可不是一般的麻煩, 特別是 Blt(); 暫時搞不徹底, 這是初步嘗試的例子:

　　代碼文件:

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:TempDelphiX.bmp';
　ImgPath2 = 'C:TempTest.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.