[Development] Qt 'minimal' platform no rendering alpha/opacity.

[Agocs Laszlo]

You do have alpha because the minimal's backingstore uses ARGB32_Premultiplied for the backing QImage.

What you do not have is setWindowOpacity(). You would need to implement QPlatformWindow::setOpacity() for that, but that is not possible with minimal since there is no compositor that could apply the opacity to the window contents during the composition step.

Best regards,
Laszlo

From: Paul Knopf <theonlylawislove at gmail.com<mailto:theonlylawislove at gmail.com>>
Date: Friday 17 April 2015 16:20
To: "development at qt-project.org<mailto:development at qt-project.org>" <development at qt-project.org<mailto:development at qt-project.org>>
Subject: [Development] Qt 'minimal' platform no rendering alpha/opacity.

I am testing the 'minimal' platform (mine is based off of it), and it seems that is doesn't render the alpha channel (setting opacity).

Here is a gist<https://gist.github.com/anonymous/544e84fbcde5022a6878> of my main function testing the opacity.

The saved images seems to have a tan background and no transparency.

Any ideas on how to get the alpha channel represented in the platform backing store?

--
Thanks!

~Paul
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