alpha buffer

[Jonas]

Is it possible to render an RGBA image in the embedded browser and then get the buffer as RGBA in my application?

In other words, if I were to render an image with transparency in Chrome and then grab the buffer from an external Windows application, the buffer would be flattened into RGB. Alpha is lost, I believe. I would like to get RGB and A.

[magreenblatt]

You can use off-screen rendering which supports alpha transparency. With off-screen rendering you create a browser that renders to a pixel buffer instead of a window. For example, run cefclient with the "--off-screen-rendering-enabled --transparent-painting-enabled" command-line flags and see the usage of CefRenderHandler.

[DusX]

I am bumping up this thread because its related to what I want to know.

Is it possible to render off screen using GPU acceleration?
And if so Imagine that would also support alpha?

I found information that it was not in the past, but much time has passed?

[magreenblatt]

See https://code.google.com/p/chromiumembed ... il?id=1257 and https://code.google.com/p/chromiumembed ... il?id=1006

[elliscope]

Following the first post from Jonas, I was able to get singular buffer that contains alph info of each pixel by doing things similar to screen shoot and example here viewtopic.php?f=11&t=881&p=3509&hilit=null+hwnd#p3509. However, will I be able to get access to the alph value of buffer that's get rendered 60 times a second(similar to requestAnimation in HTML 5) ? Repeat screen shoot process 60 times a second for rendering buffer might work, but I'm wondering is it possible for me to get the buffer directly from browser handler and build an off screen app?