On Sun, Dec 14, 2008 at 9:12 AM, Paul Pedriana <[email protected]> wrote:
> For a lot of web pages, images are the primary source of memory usage. > These images seem to be typically stored as RGB or ARGB data in the > BitmapImage class. It seems to me that applications that wish or need to > save runtime memory could benefit from runtime image compression whereby > images are stored in some compressed form instead of RGB or ARGB formats. I > am currently looking into this possibility and I'm wondering if anybody has > previously looked into it. > > My current idea is to support two kinds of compressed images: RLE and > YCoCg-DXT5. The former could be for any images that are simple enough, and > the latter could be for general images and give a fixed 4:1 compression > ratio. RGB transforms to YCoCg with better decorrelation (breakdown of RGB > to YCC) than YCbCr and many images can get PSNR values over 40 (i.e. hard to > tell from original). If the computer has decent vector processing or a > programmable GPU, the performance could be decent, otherwise it depends on > the CPU. (A)RGB could of course remain as a fallback. > > I'm wondering if anybody has looked into runtime image compression with > WebKit and considered options such as this. Several ports (S60 and Android I think) RLE compress suitable bitmaps. It does not need WebKit level support. antti > > > Thanks. > > > _______________________________________________ > webkit-dev mailing list > [email protected] > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev >
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