[Mono-dev] Help contributing to libgdiplus and Cairo integration

Jonathan Gilbert 2a5gjx302 at sneakemail.com
Wed Oct 5 13:49:55 EDT 2005

At 03:15 PM 05/10/2005 +0200, Jordi Mas wrote:
>Hi all!
>As you probably know Cairo 1.0 includes antialiasing support. This is
>something important for libgdiplus because all the drawing operations in
>System.Windows.Forms are based on the old Windows GDI and they use no

I don't have much to say about the rest of the e-mail, but this last
statement is not true. System.Windows.Forms uses System.Drawing for all of
its drawing needs, and System.Drawing is a relatively thin wrapper of GDI+,
not the old GDI32. This is why libgdiplus is named the way it is; it is a
copy of the new library Microsoft introduced in Windows 2000. GDI32 is
invoked only at the very back end where it needs to copy GDI+ Bitmaps onto
GDI32 DCs.

You can enable anti-aliasing with:

Graphics my_graphics = ...;

my_graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

Just thought I'd chime in with this, as it may be useful to any readers who
are using System.Drawing :-)

Jonathan Gilbert

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