On 02/23/2013 04:00 PM, Andreas Gal wrote: > OpenVG is a Khronos standard API for GPU accelerated 2D rendering. Its very > similar to OpenGL in design. In fact, its an alternative API to OpenGL ES on > top of EGL. It looks like that OpenVG is supported on most Android devices > and is used there by Flash (or well used to be used). B2G devices have OpenVG > support as well. There are also a number of open source implementations of > OpenVG that use OpenGL to accelerate 2D operations that might be interesting > for the desktop. OpenVG is pretty similar to Cairo and Skia when it comes to > the actual operations offered. The biggest drawback of OpenVG is that it > doesn't mix well with OpenGL. Its possible to render with OpenVG to a texture > and then composite that with OpenGL, but its not possible to do mixed > rendering with VG and GL to the same surface. That having said, I still think > we should consider adding an OpenVG backend. It would potentially > significantly speed up rendering on mobile hardware. OpenVG is quite a bit > more seasoned t > han Skia/SkiaGL, and explicitly targets mobile, whereas SkiaGL seems to be > mostly optimized for the desktop (at least so far). A particular advantage of > OpenVG is that it can take advantage of dedicated 2D acceleration hardware > (Mali and Adreno both have special 2D hardware OpenVG uses). SkiaGL on the > other hand is limited to using GLES to accelerate 2D drawing operations. What > do people think. Should we add a OpenVG backed? >
My (very limited) knowledge about OpenVG is that people in the industry at the vendor level tend to not care about it. I think the reason for this is basically that there aren't any significant users of OpenVG (WebKit used to have a VG backend but it only had one user and has now been disowned). As a result of this indifference from the vendors, my understanding is that there aren't any actual hardware accelerated VG implementations. I think Qualcomm used to have one, but if I remember correctly they didn't really want to keep maintaining it. I think we're about 3 or 4 years too late to the OpenVG party and at this point we'd be trying to resurrect it, rather than use it. _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
