Hello all, Is it possible to do the following with the Gecko Layout Engine?
I am trying to code a tiny application which is able to output the contents redenred by a HTML/Javascript layout engine to the output of a secondary graphic card. The card is a profesional video capturer/renderer which has its own SDK an it is able to KEY "alpha channeled" (RGBa) contents over live video signal using an internal key functionality. I need to get the contents rendered by the layout engine in RGBa format (with alpha channel information) so that its contents could be properly keyed using the Internal Key function of the Decklink Card. The layout engine chosen must make use of all its functionality like Javascript, PlugIns Support (Flash/Silverlight, etc.) and Audio Out to the Decklink card. Here there is a sample page which its contents shoud be keyed: http://autobombo.es/test/sample.html The idea is to input a live video to the decklink card and then the app overlays the sample.html page over the video using the internal key functionality of the decklink card. Is that Possible? PD: I've been talking about this issue in the Decklink Developers mailing list and here you have an interesting comment that can help you get a deeper understanding of this issue: ///////////////////////////////////////////////////////////////////////// "Taking a 32bit PNG should be no problem, the Decklink API allows you to create a 32bit ARGB data block using IDeckLinkOutput.CreateVideoFrame() passing "bmdFormat8BitARGB" as the "pixelFormat" property, and the card will key over your input video using the Alpha as the base key, and then you can ramp up and down overall Key Level of the graphic using IDeckLinkKeyer.SetLevel. Where I think you'll have a problem is any browser will composite your HTML , PNG, Flash, Silverlight against an opaque document background, at which point I'm not sure how you get hold of the combined Alpha channel you need to fill your ARGB frame data buffer. You could certainly scrape the browsers client window as a 24 bit colour bitmap, and I suppose you could use a single colour to indicate where to set the Alpha to 0x00 to let the video through, but that won't help you much for partial transparency." //////////////////////////////////////////////////////////////////////// Thanks everyone in advance. _______________________________________________ dev-tech-layout mailing list [email protected] https://lists.mozilla.org/listinfo/dev-tech-layout
