Delphi 2010 新增功能之: TWICImage 类[4] - 图像的修剪

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

uses Wincodec;

procedure TForm1.Button1Click(Sender: TObject);
var
WicImg: TWICImage;
Factory: IWICImagingFactory;
Clipper: IWICBitmapClipper; {修剪图像的接口}
r: WICRect;
begin
WicImg := TWICImage.Create;
WicImg.LoadFromFile('c:\temp\test.jpg');

Factory := WicImg.ImagingFactory;
Factory.CreateBitmapClipper(Clipper);

r.X := WicImg.Width div 4;
r.Y := WicImg.Height div 4;
r.Width := WicImg.Width div 2;
r.Height := WicImg.Height div 2;
Clipper.Initialize(WicImg.Handle, r);

WicImg.Handle := IWICBitmap(Clipper);
Canvas.Draw(0, 0, WicImg);

Clipper := nil;
Factory := nil;
WicImg.Free;
end;

end.