Direct2D (19) : 图层之 TD2D1LayerParameters.geometricMask (使用几何图形剪裁图层)
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Direct2D (19) : 图层之 TD2D1LayerParameters.geometricMask (使用几何图形剪裁图层)
uses Direct2D, D2D1; procedure TForm1.FormPaint(Sender: TObject); var cvs: TDirect2DCanvas; iLayer: ID2D1Layer; rLayerParameters: TD2D1LayerParameters; wic: TWICImage; R: TRect; iEllipse: ID2D1EllipseGeometry; begin wic := TWICImage.Create; wic.LoadFromFile('C:\Temp\Test.png'); R := Rect(0, 0, wic.Width, wic.Height); {几何图形} D2DFactory.CreateEllipseGeometry(D2D1Ellipse(D2D1PointF(wic.Width/2, wic.Height/2), wic.Width/2, wic.Height/2), iEllipse); cvs := TDirect2DCanvas.Create(Canvas, ClientRect); cvs.RenderTarget.SetTransform(TD2DMatrix3x2F.Translation((ClientWidth-wic.width)/2, (ClientHeight-wic.height)/2)); cvs.BeginDraw; cvs.RenderTarget.CreateLayer(nil, iLayer); rLayerParameters.contentBounds := R; rLayerParameters.geometricMask := iEllipse; //! rLayerParameters.maskAntialiasMode := D2D1_ANTIALIAS_MODE_PER_PRIMITIVE; rLayerParameters.maskTransform := TD2DMatrix3x2F.Identity; rLayerParameters.opacity := 1.0; // rLayerParameters.opacityBrush := nil; rLayerParameters.layerOptions := D2D1_LAYER_OPTIONS_NONE; cvs.RenderTarget.PushLayer(rLayerParameters, iLayer); cvs.StretchDraw(R, wic); cvs.RenderTarget.PopLayer; cvs.EndDraw; cvs.Free; wic.Free; end; procedure TForm1.FormResize(Sender: TObject); begin Repaint; end;
效果图:
posted on 2011-04-05 17:08 万一 阅读(1386) 评论(0) 编辑 收藏
标签:wic,Width,19,geometricMask,cvs,RenderTarget,rLayerParameters,图层 来源: https://blog.51cto.com/u_14617575/2745406