Rendering big images in QML1 with GLWidget
Hi folks, In PMC, we have this fragment of code which (from what I understand) uses an OpenGL canvas to draw stuff - QGLWidget *glWidget = new QGLWidget; glWidget-setAutoFillBackground(false); view-setViewport(glWidget); While this gives improved video playback performance and quality (antialiasing etc), this leads to the QML1 Image element rendering a black area for images more than a specific size (Somewhat more than 4000x3000 px). The Image renders fine if I remove the GLWidget, has anyone encountered this before and/or can suggest a solution? Cheers! -- Shantanu Tushar(UTC +0530) http://www.shantanutushar.com ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
Re: Rendering big images in QML1 with GLWidget
On Monday 03 March 2014 21:25:59 Shantanu Tushar Jha wrote: Hi folks, In PMC, we have this fragment of code which (from what I understand) uses an OpenGL canvas to draw stuff - QGLWidget *glWidget = new QGLWidget; glWidget-setAutoFillBackground(false); view-setViewport(glWidget); While this gives improved video playback performance and quality (antialiasing etc), this leads to the QML1 Image element rendering a black area for images more than a specific size (Somewhat more than 4000x3000 px). The Image renders fine if I remove the GLWidget, has anyone encountered this before and/or can suggest a solution? you try to render an image which is larger than most likely your max texture size of your GPU. You can check the actual limits with glxinfo -l. This is a common problem we have run into in KWin and we post IIRC a warning and disable OpenGL compositing. For your usecase it also sounds like a good idea to check the limits and just disable the GLWidget if the image is larger than the limit. Cheers Martin signature.asc Description: This is a digitally signed message part. ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
Re: Rendering big images in QML1 with GLWidget
Or set a sourceSize on the Image. This way you'll save memory when you load the image, and save you ever going over this limit. There's no point loading something bigger than you can display it. ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
Re: Rendering big images in QML1 with GLWidget
Ah, one of those Why didn't I think of that! moments :P Thanks folks. On Mon, Mar 3, 2014 at 11:01 PM, David Edmundson da...@davidedmundson.co.uk wrote: Or set a sourceSize on the Image. This way you'll save memory when you load the image, and save you ever going over this limit. There's no point loading something bigger than you can display it. ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel -- Shantanu Tushar(UTC +0530) http://www.shantanutushar.com ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
