Hi, On Mon, Aug 13, 2012 at 3:46 PM, Anton Obzhirov <a.obzhi...@samsung.com> wrote: > Libjpeg has some internal support for downscaling already (2x, 4x). Not sure > about > > Libpng and other libraries. In general probably it can be implemented by > downscaling decoded row of the pixels on the fly using callback API > provided.
If such a callback API for row-based resizing comes to fruition, then let's (also) not rule out whole-picture h/w accelerated resizing - such as by making that new API a mandatory stage in the decoding process. -Ilyes > > From: tomhud...@google.com [mailto:tomhud...@google.com] On Behalf Of Tom > Hudson > Sent: 13 August 2012 15:00 > To: webkit-dev@lists.webkit.org; Anton Obzhirov > Subject: Fwd: [webkit-dev] image downscaling during decoding > > > > On Mon, Aug 13, 2012 at 9:39 AM, Anton Obzhirov <a.obzhi...@samsung.com> > wrote: > > > > We are looking for ways to improve page loading speed and reduce memory > usage for WebKit in general and for GTK port of WebKit in particular. > > One of the ideas is to implement downscaling of the images during decoding > for image elements with rectangle less then original image size. > > At the moment such images are full decoded to a full size buffer and get > downscaled during rendering. > > It can be quite beneficial in term of memory usage and should speed up > rendering of the pages like image galleries for example. > > So what are your thoughts about it? > > > > Interesting idea! I know Chrome sees memory pressure from the downsampling > two-step on some pages, so I'd think this is could be useful for us, too. > > > > Isn't it going to require fairly large and intrusive changes to several > different third-party libraries, though? > > Also, different ports use different image downscaling algorithms; I can > think of ways to try to enable incremental downscaling callbacks so you > don't have to implement N downscales in each of M decoders, but none that > are both general and performant. > > > > I'd love to see a proposal on this. > > > > Tom > > (from the right account this time) > > > _______________________________________________ > webkit-dev mailing list > webkit-dev@lists.webkit.org > http://lists.webkit.org/mailman/listinfo/webkit-dev > _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-dev
