[Interest] Native text rendering in Qt 5.1 on Windows

[Knight Andrew]

Unless the non-default configure option -directwrite is passed to qtbase at configure time, the Windows QPA plugin generates glyph paths using GDI. See qtbase/src/plugins/platforms/windows/qwindowsfontengine.cpp. If configured with DirectWrite, the experimental DirectWrite font engine is used.

Note that there is a comment saying that the Windows font engine "Will probably be superseded by a common Free Type font engine in Qt 5.X.", but I'm not aware of the status of that.

-ak

________________________________________
From: interest-bounces+andrew.knight=digia.com at qt-project.org [interest-bounces+andrew.knight=digia.com at qt-project.org] on behalf of John C. Turnbull [ozemale at ozemail.com.au]
Sent: Wednesday, August 21, 2013 12:02 PM
To: 'Joseph Crowell'; interest at qt-project.org
Subject: Re: [Interest] Native text rendering in Qt 5.1 on Windows

Thanks Joseph but that link doesn’t answer my question as to how the native text is actually rendered i.e. what library/technology.

I would like to know because my (limited) understanding of Qt is that it uses OpenGL for graphics (even on Windows) and, given that OpenGL does not have any native font rendering API, how is the text rendered in a “native” way so that it appears in an OpenGL context?  For example, is DirectWrite used to render the text to a buffer which is then blasted into the OpenGL context?

From: interest-bounces+ozemale=ozemail.com.au at qt-project.org [mailto:interest-bounces+ozemale=ozemail.com.au at qt-project.org] On Behalf Of Joseph Crowell
Sent: Wednesday, 21 August 2013 18:32
To: interest at qt-project.org
Subject: Re: [Interest] Native text rendering in Qt 5.1 on Windows

Here's an blog about that feature from digia. http://blog.qt.digia.com/blog/2012/08/08/native-looking-text-in-qml-2/

On 21/08/2013 08:33 AM, ozemale at ozemail.com.au<mailto:ozemale at ozemail.com.au> wrote:
With Qt 5.1 I am able to choose "native" text rendering for my QML text objects.

What does "native" actually mean here on Windows?
What is actually used to render such text on Windows? (i.e. is it DirectWrite or some other method)

Thanks,

-jct




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