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Date: Sat, 1 Oct 2011 18:52:11 +0200 From: Enrico Weigelt <weigelt@...ux.de> To: linux-kernel@...r.kernel.org Subject: Re: Proposal for a low-level Linux display framework * Tomi Valkeinen <tomi.valkeinen@...com> wrote: Hi folks, just some *naive* thoughts (actually, I dont really understand much of the hardware and the APIs ;-o). > So we may have something like this, when all overlays read pixels from > separate areas in the memory, and all overlays are on LCD display: > > .-----. .------. .------. > | mem |-------->| ovl0 |-----.---->| LCD | > '-----' '------' | '------' > .-----. .------. | > | mem |-------->| ovl1 |-----| > '-----' '------' | > .-----. .------. | .------. > | mem |-------->| ovl2 |-----' | TV | > '-----' '------' '------' This somehow reminds me on the spire concept on C64 ;-) Wouldn't this call for an model and API which understands the concept of windows or sprites ? Lets say: we have some (virtual?) image (that's in the end seen by the user in front) that's made of certain visual objects. These objects all have their datasource (might be some in-memory framebuffer or even some external input). Somethings in the middle, lets call it compositor, somehow attached to these objects puts them together and generate the output for the physical output device (end the end of the pipeline, we'll have somehing like analog VGA or digital HDMI signal, or whatever). Ah, of course, the connections between these (sub)devices are not arbitrary, they might be switchable between a certain set of endpoints and might support different formats or transformation types (just like a amplifier in a HiFi could switch between several inputs where other devices are cabled-onto, but it wouldn't be able to connect directly to a video recorder that's just plugged to the TV by SCART cabling). In the end this IMHO looks like its all about routing and transformation. Not as simple as IP routing, more like carrier or phone networks w/ different media types, encodings, in- vs. outbound-signaling, etc. (hmm, welcome to the world of traffic engineering ;-)) Things like power management could go the opposite direction by an dependency graph: switching off the monitor could tell the output hardware that it's not needed now, and this one could tell its inputs that they're also currently not needed, and so on, and so on. All of them could tell their power supplies that they're not needed, and if no active users are left in a subgraph, the power is cut. No idea, if this all makes sense in that area, so feel free to correct me if I'm wrong ;-O cu -- ---------------------------------------------------------------------- Enrico Weigelt, metux IT service -- http://www.metux.de/ phone: +49 36207 519931 email: weigelt@...ux.de mobile: +49 151 27565287 icq: 210169427 skype: nekrad666 ---------------------------------------------------------------------- Embedded-Linux / Portierung / Opensource-QM / Verteilte Systeme ---------------------------------------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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