Comments on: Introduction to DirectWrite

By: Eliya

Eliya — Wed, 20 Jul 2011 12:32:04 +0000

Hi all,
How do i set the text to be curved?

thanks!

By: Marc Gregoire

Marc Gregoire — Wed, 08 Sep 2010 09:22:57 +0000

I’m pretty sure almost everything is done in hardware, also the cleartyping, though I didn’t find any whitepaper explaining how it works. This article [ http://msdn.microsoft.com/en-us/magazine/dd861344.aspx ] mentions:

The Direct2D text rendering pipeline is executed entirely in hardware, through three stages. The first stage writes the glyphs into a texture, the next stage down-samples these glyphs and the final stage performs a clear-type filtering operation to transfer the text to the render target.

By: Kim

Kim — Wed, 08 Sep 2010 06:12:32 +0000

Perhaps there’s another article/post pointing to this, but I’ve been unable to find any details on how DirectWrite does it’s rendering on GPUs. Does all work happen in SW and then get blitted to a HW surface in D2D? Or does the cleartype & antialiasing actually happen in a pixel shader?

By: Marc Gregoire

Marc Gregoire — Sat, 30 Jan 2010 09:00:43 +0000

Are you sure, because a DIP or Device Independent Pixel is defined as 1/96 of an inch and a point is 1/72 of an inch.

By: Keith

Keith — Fri, 29 Jan 2010 18:39:26 +0000

Note that the ConvertPointSizeToDIP should take into account the system dpi setting.
It assumes 96 dpi which is not guaranteed.

The ID2D1RenderTarget has a GetDpi(FLOAT*dpiX,FLOAT*dpiY).
Here you should use the dpiY in the calc rather than the 96 value.

By: Kurt

Kurt — Tue, 15 Sep 2009 13:41:54 +0000

How simple, I just found:
RenderTarget->SetTextAntialiasMode(D2D1_TEXT_ANTIALIAS_MODE_ALIASED);

Using this setting the font will be thin.

By: Kurt

Kurt — Tue, 15 Sep 2009 13:22:20 +0000

Hello,

is there a possibility to switch off all anti-aliasing and cleartype?

I only know RenderTarget->SetAntialiasMode(D2D1_ANTIALIAS_MODE_ALIASED)
…but this only works when drawing lines, not for Fonts.

I would be nice to have a solution.

Thank you,
Kurt

By: Marc Gregoire

Marc Gregoire — Sun, 14 Jun 2009 09:37:06 +0000

At the moment I don’t have any idea how to enable printing in Direct2D.
Maybe it’s possible to use ID2D1DCRenderTarget instead of ID2D1HwndRenderTarget to do this.
I might look into this further if I find some time.
Or if anyone else has an idea, feel free to let us know.

By: Thomas Schmidt

Thomas Schmidt — Sat, 13 Jun 2009 22:15:06 +0000

Marc,
do you have any idea how to print the same page (without copying a bitmap..)?
I fear printing needs a completely separate code path (xps, gdi or gdi+) and might give a different result.
Regards,
Thomas