Re: [E-devel] edje canvas objects
On Wed, 11 Oct 2006 16:33:17 GMT [EMAIL PROTECTED] [EMAIL PROTECTED] babbled: Likely evas will have general obj clipping not too far away, but 'buffer evases' are also interesting and useful (hence the ecore sub-canvases). I think it would be indeed really useful to have such objects: I may be wrong but I think this kind of objects is the way to go if we want to support blitting in Evas. It should improve the perfs a lot when we have to scroll large areas of screen (the scrolling part would just be a subcanvas, so, in order to scroll, we would just have to move this subcanvas. No need to redraw all the objects of the subcanvas). We could maybe implement this in the smart objects: A smart object could render (if we say so) in a subcanvas, so moving the smart object won't require to redraw all the sub objects. and it would increase mem usage drastically. no - there's better ways to do this :) Canvas objects in evas itself would be good to have for various reasons - eg. simpler, more efficient implementations of ecore sub-canvases. Could it be useful in edje...? Ummm... ??? sub-canvases definitely would be useful. they would likely not be implemented as buffers though :) Allowing smart-objs to render to an internal evas 'buffer' (not necessary for it to be a full sub-canvas), and having this as a settable option, would be useful for some things that are just not going to be possible to achieve correctly otherwise.. eg. clipping/ coloring of complex smart objs that have members which overlap.. same for the render-ops. Wether one would want this ability or not is a separate matter. this would probably be the way to go - smart objects or sub-canvas objects would have an option to tell them to pre-render to a surface of their own. However, as you mention, using sub-canvases for scrolling very large views by moving the sub-canvas.. would be *highly* memory intensive and thus likely not the most desirable means of doing this (it could be used though, in some isolated cases here and there.. depends what one might be after). yup - the solution for faster scrolling is a much more general (but much more complex) one that involves motion vectors and merging motion vector rect regions and update regions etc. to calculate what parts of a canvas have just moved (and can be blitted) and what parts need a re-render. i have prototype code i have worked on a bit to do this - but i am not happy with its performance currently so it's on the backburner. jose. - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel -- - Codito, ergo sum - I code, therefore I am -- The Rasterman (Carsten Haitzler)[EMAIL PROTECTED] 裸好多 Tokyo, Japan (東京 日本) - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
Re: [E-devel] edje canvas objects
Quoting [EMAIL PROTECTED] [EMAIL PROTECTED]: Jason writes: Much ado about gradients, but hopefully all this will make it easier to work with grads in current edje and otherwise. Forgive me for chiming in when I haven't read the full thread nor grokked the context, but does any of your work allow being able to set gradients as clipping objects? The ability to clip a text object with a gradient to allow fading text out is something I've wanted to be able to do for a long time. :) Cheers, Jason. The short anwser is no. Only rectangle objs work as clip objs in evas at this time. The longer anwser is that yes, there is a way you can do this right now - if you use a buffer evas for your text output. You would setup your buffer evas (make sure it's set to have-alpha). Then add your text obj and add a suitable grad obj on top of that -- AND set the grad obj's render-op to EVAS_RENDER_MUL. Just thought I'd follow up on this a bit... Note that in the above one can also use an image object, indeed all renderable objects respect the various render-ops (only for buffer-engine based evases right now, though the 'mul' render-op only behaves like 'clipping' for non-shape like objs, eg. images/grads). Likely evas will have general obj clipping not too far away, but 'buffer evases' are also interesting and useful (hence the ecore sub-canvases). I think it would be indeed really useful to have such objects: I may be wrong but I think this kind of objects is the way to go if we want to support blitting in Evas. It should improve the perfs a lot when we have to scroll large areas of screen (the scrolling part would just be a subcanvas, so, in order to scroll, we would just have to move this subcanvas. No need to redraw all the objects of the subcanvas). We could maybe implement this in the smart objects: A smart object could render (if we say so) in a subcanvas, so moving the smart object won't require to redraw all the sub objects. Regards, Simon TRENY MoOm - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
[E-devel] edje canvas objects
Jason writes: Much ado about gradients, but hopefully all this will make it easier to work with grads in current edje and otherwise. Forgive me for chiming in when I haven't read the full thread nor grokked the context, but does any of your work allow being able to set gradients as clipping objects? The ability to clip a text object with a gradient to allow fading text out is something I've wanted to be able to do for a long time. :) Cheers, Jason. The short anwser is no. Only rectangle objs work as clip objs in evas at this time. The longer anwser is that yes, there is a way you can do this right now - if you use a buffer evas for your text output. You would setup your buffer evas (make sure it's set to have-alpha). Then add your text obj and add a suitable grad obj on top of that -- AND set the grad obj's render-op to EVAS_RENDER_MUL. Just thought I'd follow up on this a bit... Note that in the above one can also use an image object, indeed all renderable objects respect the various render-ops (only for buffer-engine based evases right now, though the 'mul' render-op only behaves like 'clipping' for non-shape like objs, eg. images/grads). Likely evas will have general obj clipping not too far away, but 'buffer evases' are also interesting and useful (hence the ecore sub-canvases). I've mentioned before the possibility of adding an evas 'canvas' object (which could then be used for the ecore sub-canvas implementation), but even if/when such happens, it likely will not be quite as useful if edje does not support such. So, what does that mean? Well, it could mean many things but a simple interpretation would be to add to edje a 'canvas' object. This would be a texture-like edje object type (ie. has fill properties), and in its 'canvas' def block it would essentially allow for the same edc definitions that are allowed outside of such a block.. or possibly also refer to another edc file. Internally, edje could implement this in the same way as ecore does sub-canvases right now, ie. setup an img object of the 'parent' canvas and a buffer evas with that image as outbuf.. etc. Doing this would be a fairly powerful extension to edje, allowing for greater theming flexibility and interesting effects to be described at the 'theming' level. Just some thoughts on the edje :) jose. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
