[Qt-interest] Can I draw Qt objects directly to Win32 DC (Device Context)?

[Thiago Macieira]

Em Sexta-feira 28. Maio 2010, às 07.36.15, Long Cheng escreveu:
> I can draw Qt objects to an QImage and then draw the image to HDC or
> CDC. This may hurt our application's performance. It would be great if
> I can draw Qt objects directly to Win32 HDC or MFC CDC. I expect that
> there is a class, say QWin32Image for clear, then I can use it in this
> way:
> 
>       QWin32Image image(hdc, 100, 100, Format_ARGB32_Premultiplied);
>       QPainter painter(&image);
>       painter.drawText(....);
> 
> Is it possible for my thought? Or is there a better way to do that?

There's no such class.

We wrote once a GDI graphics system for Windows. Even though it was fast, the 
GDI system was incredibly limited: it fell-back to the raster engine far too 
often to be useful in real applications. I don't think it was productised 
because of that.

So, on Windows, there's no "native" graphics system. Qt defaults to raster.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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