{相关结构} TD2D1BitmapBrushProperties = record extendModeX: D2D1_EXTEND_MODE; //三个可选值分别是:0(延伸)、1(换行)、2(镜像) extendModeY: D2D1_EXTEND_MODE; //同上 interpolationMode: D2D1_BITMAP_INTERPOLATION_MODE; //拉伸图像时的差值算法:0(高速低质)、1(高质低速) end;
测试代码:
uses Direct2D, D2D1; procedure TForm1.FormPaint(Sender: TObject); var cvs: TDirect2DCanvas; iBrush: ID2D1BitmapBrush; rBBP: TD2D1BitmapBrushProperties; R: TRect; bit: TBitmap; begin bit := TBitmap.Create; bit.LoadFromFile('C:\Temp\Test.bmp'); cvs := TDirect2DCanvas.Create(Canvas, ClientRect); R := ClientRect; rBBP.extendModeX := D2D1_EXTEND_MODE_MIRROR; rBBP.extendModeY := D2D1_EXTEND_MODE_WRAP; rBBP.interpolationMode := D2D1_BITMAP_INTERPOLATION_MODE_LINEAR; cvs.RenderTarget.CreateBitmapBrush(cvs.CreateBitmap(bit), @rBBP, nil, iBrush); cvs.Brush.Handle := iBrush; //cvs.Brush.Bitmap := bit; //如果是简单平铺,可以用这句代替上面五行 cvs.Pen.Width := 0; cvs.BeginDraw; cvs.Rectangle(R); cvs.EndDraw; cvs.Free; bit.Free; end; procedure TForm1.FormResize(Sender: TObject); begin Repaint; end;
效果图:
![](https://images.cnblogs.com/cnblogs_com/del/280544/o_201104023.png)