[meta-ti] AM3359 with OpenVG libraries

[Sundareson, Prabindh]

Hello Diego,

The paint engine finds it easier to translate Qt (2D) draw calls to equivalent VG calls. In real-world HW implementations,  this does not translate to better performance. Also, I recall this backend was supported only in Symbian or similar, and not Linux.

regards,
Prabu

From: Diego Sueiro [mailto:diego.sueiro at gmail.com]
Sent: Thursday, April 17, 2014 12:47 PM
To: Sundareson, Prabindh
Cc: meta-ti mailing list
Subject: Re: [meta-ti] AM3359 with OpenVG libraries

Prabu,

On Thu, Apr 17, 2014 at 2:34 PM, Sundareson, Prabindh <prabu at ti.com<mailto:prabu at ti.com>> wrote:
Do you have some pointers to why regular Qt widgets are only accelerated by VG and not with GL ?

At http://qt-project.org/doc/qt-4.8/qt-embeddedlinux-opengl.html:
Using OpenGL ES with Qt
To use OpenGL-enabled widgets in a Qt for Embedded application, all that is required is to subclass QGLWidget and draw into instances of the subclass with standard OpenGL functions. The current implementation only supports OpenGL ES and 2D painting within a QGLWidget. Using OpenGL ES to accelerate regular widgets as well as compositing top-level windows with OpenGL ES are not currently supported. These issues will be addressed in future versions of Qt.
Note: The OpenGL paint engine is not currently supported in regular widgets. However, any application that uses QGraphicsView can set a QGLWidget as the viewport and obtain access to the OpenGL paint engine that way:


Regards,

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Diego Sueiro

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