Timage & AntialiasingMode

[airpas]

hi
does the (AntialiasingMode) property works in Timage ?
i set it to amOn but nothing changed ! . iam drawing on timage using ( timage.canvas.Line , Polygon .... )

lazarus 1.1 / fpc 2.7.1 / win7

[Blaazen]

Don't know about Windows7 (I have only wine). It works in Qt but not in GTK2. So it seems that this feature is platform-dependent. Definitely, Canvas.Line(); is perfectly antialiased in Qt4 when I use mode amOn.

[circular]

Antialiasing mode does not work on Windows.

[taazz]

The reason is that the Tcanvas is using GDI under the hood to draw and GDI does not support anti-aliased mode for graphics. you need to use a different engine eg GDI+ or use the aggpas library that comes with lazarus for painting on a buffer and copy that buffer to the image afterwards, although I think that there is a rasterizer for tbimaps included with aggpas.

[circular]

Or use my library BGRABitmap. An TBGRABitmap object has a property CanvasBGRA, that provides the same function as TCanvas, except that antialiasing always works.